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da51b3bd95 This commit was manufactured by cvs2svn to create branch 'RC_1_34_0'.
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project boost/libs/fusion/doc ;
import boostbook : boostbook ;
using quickbook ;
boostbook quickbook
:
fusion.qbk
:
<xsl:param>boost.root=../../../..
<xsl:param>boost.libraries=../../../libraries.htm
<xsl:param>chunk.section.depth=4
<xsl:param>chunk.first.sections=1
<xsl:param>toc.section.depth=3
<xsl:param>toc.max.depth=1
;

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[section Acknowledgements]
Special thanks to David Abrahams, Douglas Gregor, Hartmut Kaiser, Aleksey
Gurtovoy, Peder Holt, Daniel Wallin, Jaakko Jarvi, Jeremiah Willcock, Dan
Marsden, Eric Niebler, Joao Abecasis and Andy Little. These people are
instrumental in the design and development of Fusion.
Special thanks to Ronald Garcia, the review manager and to all the people in the
boost community who participated in the review: Andreas Pokorny, Andreas Huber,
Jeff Flinn, David Abrahams, Pedro Lamarao, Larry Evans, Ryan Gallagher, Andy
Little, Gennadiy Rozental, Tobias Schwinger, Joao Abecasis, Eric Niebler, Oleg
Abrosimov, Gary Powell, Eric Friedman, Darren Cook, Martin Bonner and Douglas
Gregor.
[endsect]

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[section Change log]
This section summarizes significant changes to the Fusion library.
[endsect]

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[section Extension]
The Fusion library is designed to be extensible, new sequences types can easily
be added. In fact, the library support for `std::pair`, `boost::array` and __mpl__
sequences is entirely provided using the extension mechanism.
The process for adding a new sequence type to Fusion is:
# Enable the __tag_dispatching__ mechanism used by Fusion for your sequence type
# Design an iterator type for the sequence
# Provide specialized behaviour for the intrinsic operations of the new Fusion sequence
[heading Our example]
In order to illustrate enabling a new sequence type for use with Fusion, we
are going to use the type:
namespace example
{
struct example_struct
{
std::string name;
int age;
example_struct(
const std::string& n,
int a)
: name(n), age(a)
{}
};
}
We are going to pretend that this type has been provided by a 3rd party
library, and therefore cannot be modified. We shall work through all the
necessary steps to enable `example_struct` to serve as an __associative_sequence__
as described in the __quick_start__ guide.
[heading Enabling Tag Dispatching]
The Fusion extensibility mechanism uses __tag_dispatching__ to call the
correct code for a given sequence type. In order to exploit the tag
dispatching mechanism we must first declare a new tag type for the
mechanism to use. For example:
namespace example {
struct example_sequence_tag; // Only definition needed
}
Next we need to enable the `traits::tag_of` metafunction to return our newly chosen
tag type for operations involving our sequence. This is done by specializing
`traits::tag_of` for our sequence type.
#include <boost/fusion/support/tag_of_fwd.hpp>
namespace boost { namespace fusion { namespace traits {
template<>
struct tag_of<example_struct>
{
typedef example::example_sequence_tag type;
};
}}}
`traits::tag_of` also has a second template argument,
that can be used in conjuction with `boost::enable_if` to provide tag
support for groups of related types. This feature is not necessary
for our sequence, but for an example see the code in:
#include <boost/fusion/sequence/adapted/mpl/tag_of.hpp>
[heading Designing a suitable iterator]
We need an iterator to describe positions, and provide access to
the data within our sequence. As it is straightforward to do,
we are going to provide a random access iterator in our example.
We will use a simple design, in which the 2 members of
`example_struct` are given numbered indices, 0 for `name` and
1 for `age` respectively.
template<typename Struct, int Pos>
struct example_struct_iterator
: boost::fusion::iterator_base<example_struct_iterator<Struct, Pos> >
{
BOOST_STATIC_ASSERT(Pos >=0 && Pos < 3);
typedef Struct struct_type;
typedef boost::mpl::int_<Pos> index;
typedef boost::fusion::random_access_traversal_tag category;
example_struct_iterator(Struct& str)
: struct_(str) {}
Struct& struct_;
};
A quick summary of the details of our iterator:
# The iterator is parameterized by the type it is iterating over, and the index of the current element.
# The typedefs `struct_type` and `index` provide convenient access to information we will need later in
the implementation.
# The typedef `category` allows the `traits::__category_of__` metafunction to establish
the traversal category of the iterator.
# The constructor stores a reference to the `example_struct` being iterated over.
We also need to enable __tag_dispatching__ for our iterator type, with another specialization of
`traits::tag_of`.
In isolation, the iterator implementation is pretty dry. Things should become clearer as we
add features to our implementation.
[heading A first couple of instructive features]
To start with, we will get the __result_of_value_of__ metafunction working. To
do this, we provide a specialization of the `boost::fusion::extension::value_of_impl` template for
our iterator's tag type.
template<>
struct value_of_impl<example::example_struct_iterator_tag>
{
template<typename Iterator>
struct apply;
template<typename Struct>
struct apply<example::example_struct_iterator<Struct, 0> >
{
typedef std::string type;
};
template<typename Struct>
struct apply<example::example_struct_iterator<Struct, 1> >
{
typedef int type;
};
};
The implementation itself is pretty simple, it just uses 2 partial specializations to
provide the type of the 2 different members of `example_struct`, based on the index of the iterator.
To understand how `value_of_impl` is used by the library we will look at the implementation of __value_of__:
template <typename Iterator>
struct __value_of__
: extension::value_of_impl<typename detail::tag_of<Iterator>::type>::
template apply<Iterator>
{};
So __value_of__ uses __tag_dispatching__ to select an __mpl_metafunction_class__
to provide its functionality. You will notice this pattern throughout the
implementation of Fusion.
Ok, lets enable dereferencing of our iterator. In this case we must provide a suitable
specialization of `deref_impl`.
template<>
struct deref_impl<example::example_struct_iterator_tag>
{
template<typename Iterator>
struct apply;
template<typename Struct>
struct apply<example::example_struct_iterator<Struct, 0> >
{
typedef typename mpl::if_<
is_const<Struct>, std::string const&, std::string&>::type type;
static type
call(example::example_struct_iterator<Struct, 0> const& it)
{
return it.struct_.name;
}
};
template<typename Struct>
struct apply<example::example_struct_iterator<Struct, 1> >
{
typedef typename mpl::if_<
is_const<Struct>, int const&, int&>::type type;
static type
call(example::example_struct_iterator<Struct, 1> const& it)
{
return it.struct_.age;
}
};
};
}
The use of `deref_impl` is very similar to that of `value_of_impl`, but it also
provides some runtime functionality this time via the `call` static member function.
To see how `deref_impl` is used, lets have a look at the implementation of __deref__:
namespace result_of
{
template <typename Iterator>
struct __deref__
: extension::deref_impl<typename detail::tag_of<Iterator>::type>::
template apply<Iterator>
{};
}
template <typename Iterator>
typename result_of::deref<Iterator>::type
__deref__(Iterator const& i)
{
typedef result_of::deref<Iterator> deref_meta;
return deref_meta::call(i);
}
So again __result_of_deref__ uses __tag_dispatching__ in exactly the
same way as the __value_of__ implementation. The runtime functionality used
by __deref__ is provided by the `call` static function of the selected
__mpl_metafunction_class__.
The actual implementation of `deref_impl` is slightly more complex than that of `value_of_impl`.
We also need to implement the `call` function, which returns a reference
to the appropriate member of the underlying sequence. We also require a little
bit of metaprogramming to return `const` references if the underlying sequence
is const.
[note Although there is a fair amount of left to do to produce a fully fledged
Fusion sequence, __value_of__ and __deref__ illustrate all the signficant concepts
required. The remainder of the process is very repetitive, simply requiring
implementation of a suitable `xxxx_impl` for each feature `xxxx`.
]
[heading Implementing the remaining iterator functionality]
Ok, now we have seen the way __value_of__ and __deref__ work, everything else will work
in pretty much the same way. Lets start with forward iteration,
by providing a `next_impl`:
template<>
struct next_impl<example::example_struct_iterator_tag>
{
template<typename Iterator>
struct apply
{
typedef typename Iterator::struct_type struct_type;
typedef typename Iterator::index index;
typedef example::example_struct_iterator<struct_type, index::value + 1> type;
static type
call(Iterator const& i)
{
return type(i.struct_);
}
};
};
This should be very familiar from our `deref_impl` implementation, we will be
using this approach again and again now. Our design is simply to increment
the `index` counter to move on to the next element. The various other iterator
manipulations we need to perform will all just involve simple calculations
with the `index` variables.
We also need to provide a suitable `equal_to_impl` so that iterators can be
correctly compared. A __bidirectional_iterator__ will also need an implementation of `prior_impl`. For a
__random_access_iterator__ `distance_impl` and `advance_impl` also need to be provided
in order to satisfy the necessary complexity guarantees. As our iterator is
a __random_access_iterator__ we will have to implement all of these functions.
Full implementations of `prior_impl`, `advance_impl`, `distance_impl` and `equal_to_impl` are
provided in the example code.
[heading Implementing the intrinsic functions of the sequence]
In order that Fusion can correctly identify our sequence as a Fusion sequence, we
need to enable `is_sequence` for our sequence type. As usual we just create
an `impl` type specialized for our sequence tag:
template<>
struct is_sequence_impl<example::example_sequence_tag>
{
template<typename T>
struct apply : mpl::true_ {};
};
We've some similar formalities to complete, providing `category_of_impl` so Fusion
can correctly identify our sequence type, and `is_view_impl` so Fusion can correctly
identify our sequence as not being a __view__ type. Implementations are
provide in the example code.
Now we've completed some formalities, on to more interesting features. Lets get
__begin__ working so that we can get an iterator to start accessing the data in
our sequence.
template<>
struct begin_impl<example::example_sequence_tag>
{
template<typename Sequence>
struct apply
{
typedef example::example_struct_iterator<Sequence, 0> type;
static type
call(Sequence& seq)
{
return type(seq);
}
};
};
The implementation uses the same ideas we have applied throughout, in this case
we are just creating one of the iterators we developed earlier, pointing to the
first element in the sequence. The implementation of __end__ is very similar, and
is provided in the example code.
For our __random_access_sequence__ we will also need to implement `size_impl`,
`value_at_impl` and `at_impl`.
[heading Enabling our type as an associative container]
In order for `example_struct` to serve as an associative container,
we need to enable 3 lookup features, __at_key__, __value_at_key__ and __has_key__.
We also need to provide an implementation of the `is_associative` trait
so that our sequence can be correctly identified as an associative container.
To implement `at_key_impl` we need to associate the `fields::age` and `fields::age`
types described in the __quick_start__ guide with the appropriate members of `example_struct`.
Our implementation is as follows:
template<>
struct at_key_impl<example::example_sequence_tag>
{
template<typename Sequence, typename Key>
struct apply;
template<typename Sequence>
struct apply<Sequence, fields::name>
{
typedef typename mpl::if_<
is_const<Sequence>,
std::string const&,
std::string&>::type type;
static type
call(Sequence& seq)
{
return seq.name;
};
};
template<typename Sequence>
struct apply<Sequence, fields::age>
{
typedef typename mpl::if_<
is_const<Sequence>,
int const&,
int&>::type type;
static type
call(Sequence& seq)
{
return seq.age;
};
};
};
Its all very similar to the implementations we've seen previously,
such as `deref_impl` and `value_of_impl`. Instead of identifying
the members by index or position, we are now selecting them using
the types `fields::name` and `fields::age`. The implementations of
`value_at_key_impl` and `has_key_impl` are equally straightforward,
and are provided in the example code, along with an implementation
of `is_associative_impl`.
[heading Summary]
We've now worked through the entire process for adding a new random
access sequence and we've also enabled our type to serve as an associative
container. The implementation was slightly longwinded, but followed
a simple repeating pattern.
The support for `std::pair`, __mpl__ sequences, and `boost::array` all
use the same approach, and provide additional examples of the approach
for a variety of types.
[endsect]

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[library Fusion
[quickbook 1.3]
[version 2.0]
[authors [de Guzman, Joel], [Marsden, Dan]]
[copyright 2001 2002 2003 2004 2005 Joel de Guzman, Dan Marsden]
[purpose Statically Typed Heterogeneous Data Structures and Algorithms]
[license
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
[@http://www.boost.org/LICENSE_1_0.txt])
]
]
[def __note__ [$images/note.png]]
[def __alert__ [$images/alert.png]]
[def __tip__ [$images/tip.png]]
[def __caution__ [$images/caution.png]]
[def __spirit__ [@http://spirit.sourceforge.net Spirit]]
[def __phoenix__ [@http://boost.org/libs/spirit/phoenix/index.html Phoenix]]
[def __mpl__ [@http://www.boost.org/libs/mpl/index.html MPL]]
[def __stl__ [@http://en.wikipedia.org/wiki/Standard_Template_Library STL]]
[def __tuple__ [@http://www.boost.org/libs/tuple/doc/tuple_users_guide.html Boost.Tuple]]
[def __tr1__tuple__ [@http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/2002/n1403.pdf TR1 Tuple]]
[def __boost_tools__ [@http://www.boost.org/tools/index.html Boost Tools]]
[def __spirit_list__ [@https://lists.sourceforge.net/lists/listinfo/spirit-general Spirit Mailing List]]
[def __spirit_general__ [@news://news.gmane.org/gmane.comp.spirit.general Spirit General NNTP news portal]]
[def __gmane__ [@http://www.gmane.org Gmane]]
[def __mlist_archive__ [@http://news.gmane.org/gmane.comp.parsers.spirit.general]]
[def __jaakko_jarvi__ [@http://www.boost.org/people/jaakko_jarvi.htm Jaakko Jarvi]]
[def __david_abrahams__ [@http://www.boost.org/people/dave_abrahams.htm David Abrahams]]
[def __boost_any__ [@http://boost.org/doc/html/any.html Boost.Any]]
[def __new_iterator_concepts__ [@http://boost.org/libs/iterator/doc/new-iter-concepts.html New Iterator Concepts]]
[def __boost_array_library__ [@http://www.boost.org/doc/html/array.html Boost.Array Library]]
[def __boost_ref__ [@http://www.boost.org/doc/html/ref.html Boost.Ref]]
[def __boost_ref_call__ [@http://www.boost.org/doc/html/ref.html `ref`]]
[def __std_pair_doc__ [@http://www.sgi.com/tech/stl/pair.html `std::pair`]]
[def __mpl_integral_constant__ MPL Integral Constant]
[def __mpl_boolean_constant__ MPL Boolean Constant]
[def __mpl_metafunction_class__ MPL Metafunction Class]
[def __mpl_lambda_expression__ MPL Lambda Expression]
[def __lvalue__ LValue]
[def __unspecified__ /unspecified/]
[def __support__ [link fusion.support Support]]
[def __is_sequence__ [link fusion.support.is_sequence `is_sequence`]]
[def __is_view__ [link fusion.support.is_view `is_view`]]
[def __tag_of__ [link fusion.support.tag_of `tag_of`]]
[def __category_of__ [link fusion.support.category_of `category_of`]]
[def __fusion_pair__ [link fusion.support.pair `fusion::pair`]]
[def __pair__ [link fusion.support.pair `pair`]]
[def __fusion_make_pair__ [link fusion.support.pair `make_pair`]]
[def __iterator__ [link fusion.iterators Iterator]]
[def __iterator_concepts__ [link fusion.iterators.concepts Iterator Concepts]]
[def __forward_iterator__ [link fusion.iterators.concepts.forward_iterator Forward Iterator]]
[def __bidirectional_iterator__ [link fusion.iterators.concepts.bidirectional_iterator Bidirectional Iterator]]
[def __random_access_iterator__ [link fusion.iterators.concepts.random_access_iterator Random Access Iterator]]
[def __next__ [link fusion.iterators.functions.next `next`]]
[def __prior__ [link fusion.iterators.functions.prior `prior`]]
[def __advance__ [link fusion.iterators.functions.advance `advance`]]
[def __advance_c__ [link fusion.iterators.functions.advance_c `advance_c`]]
[def __distance__ [link fusion.iterators.functions.distance `distance`]]
[def __deref__ [link fusion.iterators.functions.deref `deref`]]
[def __result_of_next__ [link fusion.iterators.metafunctions.next `result_of::next`]]
[def __result_of_prior__ [link fusion.iterators.metafunctions.prior `result_of::prior`]]
[def __result_of_equal_to__ [link fusion.iterators.metafunctions.equal_to `result_of::equal_to`]]
[def __result_of_advance__ [link fusion.iterators.metafunctions.advance `result_of::advance`]]
[def __result_of_advance_c__ [link fusion.iterators.metafunctions.advance_c `result_of::advance_c`]]
[def __result_of_distance__ [link fusion.iterators.metafunctions.distance `result_of::distance`]]
[def __result_of_deref__ [link fusion.iterators.metafunctions.deref `result_of::deref`]]
[def __result_of_value_of__ [link fusion.iterators.metafunctions.value_of `result_of::value_of`]]
[def __value_of__ [link fusion.iterators.metafunctions.value_of `value_of`]]
[def __sequence__ [link fusion.sequences Sequence]]
[def __sequence_concepts__ [link fusion.sequences.concepts Sequence Concepts]]
[def __traversal_concept__ [link fusion.sequences.concepts.traversal Sequence Traversal Concept]]
[def __associativity_concept__ [link fusion.sequences.concepts.associativity Sequence Associativity Concept]]
[def __forward_sequence__ [link fusion.sequences.concepts.forward_sequence Forward Sequence]]
[def __bidirectional_sequence__ [link fusion.sequences.concepts.bidirectional_sequence Bidirectional Sequence]]
[def __random_access_sequence__ [link fusion.sequences.concepts.random_access_sequence Random Access Sequence]]
[def __associative_sequence__ [link fusion.sequences.concepts.associative_sequence Associative Sequence]]
[def __containers__ [link fusion.sequences.containers Containers]]
[def __vector__ [link fusion.sequences.containers.vector `vector`]]
[def __cons__ [link fusion.sequences.containers.cons `cons`]]
[def __list__ [link fusion.sequences.containers.list `list`]]
[def __set__ [link fusion.sequences.containers.set `set`]]
[def __map__ [link fusion.sequences.containers.map `map`]]
[def __view__ [link fusion.sequences.views View]]
[def __views__ [link fusion.sequences.views Views]]
[def __single_view__ [link fusion.sequences.views.single_view `single_view`]]
[def __filter_view__ [link fusion.sequences.views.filter_view `filter_view`]]
[def __iterator_range__ [link fusion.sequences.views.iterator_range `iterator_range`]]
[def __joint_view__ [link fusion.sequences.views.joint_view `joint_view`]]
[def __transform_view__ [link fusion.sequences.views.transform_view `transform_view`]]
[def __reverse_view__ [link fusion.sequences.views.reverse_view `reverse_view`]]
[def __std_pair__ [link fusion.sequences.adapted.std__pair `std::pair`]]
[def __boost_array__ [link fusion.sequences.adapted.boost__array `boost::array`]]
[def __mpl_sequence__ [link fusion.sequences.adapted.mpl_sequence mpl sequence]]
[def __intrinsic__ [link fusion.sequences.intrinsics Intrinsic]]
[def __intrinsics__ [link fusion.sequences.intrinsics Intrinsics]]
[def __begin__ [link fusion.sequences.intrinsics.functions.begin `begin`]]
[def __result_of_begin__ [link fusion.sequences.intrinsics.metafunctions.begin `result_of::begin`]]
[def __end__ [link fusion.sequences.intrinsics.functions.end `end`]]
[def __result_of_end__ [link fusion.sequences.intrinsics.metafunctions.end `result_of::end`]]
[def __size__ [link fusion.sequences.intrinsics.functions.size `size`]]
[def __result_of_size__ [link fusion.sequences.intrinsics.metafunctions.size `result_of::size`]]
[def __empty__ [link fusion.sequences.intrinsics.functions.empty `empty`]]
[def __result_of_empty__ [link fusion.sequences.intrinsics.metafunctions.empty `result_of::empty`]]
[def __front__ [link fusion.sequences.intrinsics.functions.front `front`]]
[def __result_of_front__ [link fusion.sequences.intrinsics.metafunctions.front `result_of::front`]]
[def __back__ [link fusion.sequences.intrinsics.functions.back `back`]]
[def __result_of_back__ [link fusion.sequences.intrinsics.metafunctions.back `result_of::back`]]
[def __at__ [link fusion.sequences.intrinsics.functions.at `at`]]
[def __result_of_at__ [link fusion.sequences.intrinsics.metafunctions.at `result_of::at`]]
[def __at_c__ [link fusion.sequences.intrinsics.functions.at_c `at_c`]]
[def __result_of_at_c__ [link fusion.sequences.intrinsics.metafunctions.at_c `result_of::at_c`]]
[def __at_key__ [link fusion.sequences.intrinsics.functions.at_key `at_key`]]
[def __result_of_at_key__ [link fusion.sequences.intrinsics.metafunctions.at_key `result_of::at_key`]]
[def __has_key__ [link fusion.sequences.intrinsics.functions.has_key `has_key`]]
[def __result_of_has_key__ [link fusion.sequences.intrinsics.metafunctions.has_key `result_of::has_key`]]
[def __value_at_key__ [link fusion.sequences.intrinsics.metafunctions.value_at_key `value_at_key`]]
[def __result_of_value_at__ [link fusion.sequences.intrinsics.metafunctions.value_at `result_of::value_at`]]
[def __result_of_value_at_c__ [link fusion.sequences.intrinsics.metafunctions.value_at_c `result_of::value_at_c`]]
[def __result_of_value_at_key__ [link fusion.sequences.intrinsics.metafunctions.value_at_key `result_of::value_at_key`]]
[def __conversion__ [link fusion.sequences.conversion.functions Conversion]]
[def __result_of_conversion__ [link fusion.sequences.conversion.metafunctions Conversion Metafunctions]]
[def __as_vector__ [link fusion.sequences.conversion.functions.as_vector `as_vector`]]
[def __result_of_as_vector__ [link fusion.sequences.conversion.metafunctions.as_vector `result_of::as_vector`]]
[def __as_list__ [link fusion.sequences.conversion.functions.as_list `as_list`]]
[def __result_of_as_list__ [link fusion.sequences.conversion.metafunctions.as_list `result_of::as_list`]]
[def __as_set__ [link fusion.sequences.conversion.functions.as_set `as_set`]]
[def __result_of_as_set__ [link fusion.sequences.conversion.metafunctions.as_set `result_of::as_set`]]
[def __as_map__ [link fusion.sequences.conversion.functions.as_map `as_map`]]
[def __result_of_as_map__ [link fusion.sequences.conversion.metafunctions.as_map `result_of::as_map`]]
[def __generation__ [link fusion.sequences.generation.functions Generation]]
[def __result_of_generation__ [link fusion.sequences.generation.metafunctions Generation Metafunctions]]
[def __make_vector__ [link fusion.sequences.generation.functions.make_vector `make_vector`]]
[def __result_of_make_vector__ [link fusion.sequences.generation.metafunctions.make_vector `result_of::make_vector`]]
[def __vector_tie__ [link fusion.sequences.generation.functions.vector_tie `vector_tie`]]
[def __result_of_vector_tie__ [link fusion.sequences.generation.metafunctions.vector_tie `result_of::vector_tie`]]
[def __make_vector__ [link fusion.sequences.generation.functions.make_vector `make_vector`]]
[def __result_of_make_vector__ [link fusion.sequences.generation.metafunctions.make_vector `result_of::make_vector`]]
[def __make_cons__ [link fusion.sequences.generation.functions.make_cons `make_cons`]]
[def __result_of_make_cons__ [link fusion.sequences.generation.metafunctions.make_cons `result_of::make_cons`]]
[def __make_list__ [link fusion.sequences.generation.functions.make_list `make_list`]]
[def __result_of_make_list__ [link fusion.sequences.generation.metafunctions.make_list `result_of::make_list`]]
[def __make_set__ [link fusion.sequences.generation.functions.make_set `make_set`]]
[def __result_of_make_set__ [link fusion.sequences.generation.metafunctions.make_set `result_of::make_set`]]
[def __make_map__ [link fusion.sequences.generation.functions.make_map `make_map`]]
[def __result_of_make_map__ [link fusion.sequences.generation.metafunctions.make_map `result_of::make_map`]]
[def __list_tie__ [link fusion.sequences.generation.functions.list_tie `list_tie`]]
[def __result_of_list_tie__ [link fusion.sequences.generation.metafunctions.list_tie `result_of::list_tie`]]
[def __out__ [link fusion.sequences.operators.i_o.out out]]
[def __in__ [link fusion.sequences.operators.i_o.in in]]
[def __eq__ [link fusion.sequences.operators.comparison.equal equal]]
[def __neq__ [link fusion.sequences.operators.comparison.not_equal not equal]]
[def __lt__ [link fusion.sequences.operators.comparison.less_than less than]]
[def __lte__ [link fusion.sequences.operators.comparison.less_than_equal less than equal]]
[def __gt__ [link fusion.sequences.operators.comparison.greater_than greater than]]
[def __gte__ [link fusion.sequences.operators.comparison.greater_than_equal greater than equal]]
[def __algorithm__ [link fusion.algorithms Algorithm]]
[def __algorithms__ [link fusion.algorithms Algorithms]]
[def __poly_func_obj__ [link fusion.algorithms.concepts.polymorphic_function_object Polymorphic Function Object]]
[def __fold__ [link fusion.algorithms.iteration.functions.fold `fold`]]
[def __result_of_fold__ [link fusion.algorithms.iteration.metafunctions.fold `result_of::fold`]]
[def __accumulate__ [link fusion.algorithms.iteration.functions.accumulate `accumulate`]]
[def __result_of_accumulate__ [link fusion.algorithms.iteration.metafunctions.accumulate `result_of::accumulate`]]
[def __for_each__ [link fusion.algorithms.iteration.functions.for_each `for_each`]]
[def __result_of_for_each__ [link fusion.algorithms.iteration.metafunctions.for_each `result_of::for_each`]]
[def __any__ [link fusion.algorithms.query.functions.any `any`]]
[def __result_of_any__ [link fusion.algorithms.query.metafunctions.any `result_of::any`]]
[def __all__ [link fusion.algorithms.query.functions.all `all`]]
[def __result_of_all__ [link fusion.algorithms.query.metafunctions.all `result_of::all`]]
[def __none__ [link fusion.algorithms.query.functions.none `none`]]
[def __result_of_none__ [link fusion.algorithms.query.metafunctions.none `result_of::none`]]
[def __find__ [link fusion.algorithms.query.functions.find `find`]]
[def __result_of_find__ [link fusion.algorithms.query.metafunctions.find `result_of::find`]]
[def __find_if__ [link fusion.algorithms.query.functions.find_if `find_if`]]
[def __result_of_find_if__ [link fusion.algorithms.query.metafunctions.find_if `result_of::find_if`]]
[def __count__ [link fusion.algorithms.query.functions.count `count`]]
[def __result_of_count__ [link fusion.algorithms.query.metafunctions.count `result_of::count`]]
[def __count_if__ [link fusion.algorithms.query.functions.count_if `count_if`]]
[def __result_of_count_if__ [link fusion.algorithms.query.metafunctions.count_if `result_of::count_if`]]
[def __filter__ [link fusion.algorithms.transformation.functions.filter `filter`]]
[def __result_of_filter__ [link fusion.algorithms.transformation.metafunctions.filter `result_of::filter`]]
[def __filter_if__ [link fusion.algorithms.transformation.functions.filter_if `filter_if`]]
[def __result_of_filter_if__ [link fusion.algorithms.transformation.metafunctions.filter_if `result_of::filter_if`]]
[def __transform__ [link fusion.algorithms.transformation.functions.transform `transform`]]
[def __result_of_transform__ [link fusion.algorithms.transformation.metafunctions.transform `result_of::transform`]]
[def __replace__ [link fusion.algorithms.transformation.functions.replace `replace`]]
[def __result_of_replace__ [link fusion.algorithms.transformation.metafunctions.replace `result_of::replace`]]
[def __replace_if__ [link fusion.algorithms.transformation.functions.replace_if `replace_if`]]
[def __result_of_replace_if__ [link fusion.algorithms.transformation.metafunctions.replace_if `result_of::replace_if`]]
[def __remove__ [link fusion.algorithms.transformation.functions.remove `remove`]]
[def __result_of_remove__ [link fusion.algorithms.transformation.metafunctions.remove `result_of::remove`]]
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[def __result_of_remove_if__ [link fusion.algorithms.transformation.metafunctions.remove_if `result_of::remove_if`]]
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[def __result_of_reverse__ [link fusion.algorithms.transformation.metafunctions.reverse `result_of::reverse`]]
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[def __result_of_clear__ [link fusion.algorithms.transformation.metafunctions.clear `result_of::clear`]]
[def __erase__ [link fusion.algorithms.transformation.functions.erase `erase`]]
[def __result_of_erase__ [link fusion.algorithms.transformation.metafunctions.erase `result_of::erase`]]
[def __erase_key__ [link fusion.algorithms.transformation.functions.erase_key `erase_key`]]
[def __result_of_erase_key__ [link fusion.algorithms.transformation.metafunctions.erase_key `result_of::erase_key`]]
[def __insert__ [link fusion.algorithms.transformation.functions.insert `insert`]]
[def __result_of_insert__ [link fusion.algorithms.transformation.metafunctions.insert `result_of::insert`]]
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[def __result_of_zip__ [link fusion.algorithms.transformation.metafunctions.zip `result_of::zip`]]
[def __pop_back__ [link fusion.algorithms.transformation.functions.pop_back `pop_back`]]
[def __result_of_pop_back__ [link fusion.algorithms.transformation.metafunctions.pop_back `result_of::pop_back`]]
[def __pop_front__ [link fusion.algorithms.transformation.functions.pop_front `pop_front`]]
[def __result_of_pop_front__ [link fusion.algorithms.transformation.metafunctions.pop_front `result_of::pop_front`]]
[def __push_back__ [link fusion.algorithms.transformation.functions.push_back `push_back`]]
[def __result_of_push_back__ [link fusion.algorithms.transformation.metafunctions.push_back `result_of::push_back`]]
[def __push_front__ [link fusion.algorithms.transformation.functions.push_front `push_front`]]
[def __result_of_push_front__ [link fusion.algorithms.transformation.metafunctions.push_front `result_of::push_front`]]
[def __tr1_tuple_pair__ [link fusion.tuples.pairs `TR1 and std::pair`]]
[def __tuple_get__ [link fusion.tuples.class_template_tuple.element_access `get`]]
[def __recursive_inline__ [link fusion.notes.recursive_inlined_functions Recursive Inlined Functions]]
[def __overloaded_functions__ [link fusion.notes.overloaded_functions Overloaded Functions]]
[def __tag_dispatching__ [link fusion.notes.tag_dispatching /tag dispatching/]]
[def __element_conversion__ [link fusion.notes.element_conversion /element conversion/]]
[def __see_element_conversion__ [link fusion.notes.element_conversion /see element conversion/]]
[def __note_boost_ref__ [link fusion.notes.boost__ref `boost::ref`]]
[def __quick_start__ [link fusion.quick_start Quick Start]]
[def __organization__ [link fusion.organization Orgainization]]
[def __extension__ [link fusion.extension Extension]]
[include preface.qbk]
[include introduction.qbk]
[include quick_start.qbk]
[include organization.qbk]
[include support.qbk]
[include iterators.qbk]
[include sequences.qbk]
[include algorithms.qbk]
[include tuples.qbk]
[include extension.qbk]
[include notes.qbk]
[include changelog.qbk]
[include acknowledgements.qbk]
[include references.qbk]

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@ -1,511 +0,0 @@
/*=============================================================================
Copyright (c) 2004 Joel de Guzman
http://spirit.sourceforge.net/
Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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<html>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="fusion.acknowledgements"></a><a href="acknowledgements.html" title="Acknowledgements">Acknowledgements</a></h2></div></div></div>
<p>
Special thanks to David Abrahams, Douglas Gregor, Hartmut Kaiser, Aleksey Gurtovoy,
Peder Holt, Daniel Wallin, Jaakko Jarvi, Jeremiah Willcock, Dan Marsden, Eric
Niebler, Joao Abecasis and Andy Little. These people are instrumental in the
design and development of Fusion.
</p>
<p>
Special thanks to Ronald Garcia, the review manager and to all the people in
the boost community who participated in the review: Andreas Pokorny, Andreas
Huber, Jeff Flinn, David Abrahams, Pedro Lamarao, Larry Evans, Ryan Gallagher,
Andy Little, Gennadiy Rozental, Tobias Schwinger, Joao Abecasis, Eric Niebler,
Oleg Abrosimov, Gary Powell, Eric Friedman, Darren Cook, Martin Bonner and
Douglas Gregor.
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
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<a name="fusion.algorithms"></a><a href="algorithms.html" title="Algorithms">Algorithms</a></h2></div></div></div>
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<dt><span class="section"><a href="algorithms/concepts.html">Concepts</a></span></dt>
<dt><span class="section"><a href="algorithms/iteration.html">Iteration</a></span></dt>
<dt><span class="section"><a href="algorithms/query.html">Query</a></span></dt>
<dt><span class="section"><a href="algorithms/transformation.html">Transformation</a></span></dt>
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<a name="fusion.algorithms.lazy_evaluation"></a><h3>
<a name="id549240"></a>
<a href="algorithms.html#fusion.algorithms.lazy_evaluation">Lazy Evaluation</a>
</h3>
<p>
Unlike <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>, Fusion
algorithms are lazy and non sequence-type preserving. What does that mean?
It means that when you operate on a sequence through a Fusion algorithm that
returns a sequence, the sequence returned may not be of the same class as the
original. This is by design. Runtime efficiency is given a high priority. Like
<a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>, and unlike
<a href="http://en.wikipedia.org/wiki/Standard_Template_Library" target="_top">STL</a>,
fusion algorithms are functional in nature such that algorithms are non mutating
(no side effects). However, due to the high cost of returning full sequences
such as vectors and lists, <span class="emphasis"><em>Views</em></span> are returned from Fusion
algorithms instead. For example, the <a href="algorithms/transformation/functions/transform.html" title="transform"><tt class="computeroutput"><span class="identifier">transform</span></tt></a> algorithm does not actually
return a transformed version of the original sequence. <a href="algorithms/transformation/functions/transform.html" title="transform"><tt class="computeroutput"><span class="identifier">transform</span></tt></a> returns a <a href="sequences/views/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a>. This view holds a
reference to the original sequence plus the transform function. Iteration over
the <a href="sequences/views/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a>
will apply the transform function over the sequence elements on demand. This
<span class="emphasis"><em>lazy</em></span> evaluation scheme allows us to chain as many algorithms
as we want without incurring a high runtime penalty.
</p>
<a name="fusion.algorithms.sequence_extension"></a><h3>
<a name="id549380"></a>
<a href="algorithms.html#fusion.algorithms.sequence_extension">Sequence Extension</a>
</h3>
<p>
The <span class="emphasis"><em>lazy</em></span> evaluation scheme where <a href="algorithms.html" title="Algorithms">Algorithms</a>
return <a href="sequences/views.html" title="Views">Views</a> also allows operations
such as <a href="algorithms/transformation/functions/push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">push_back</span></tt></a> to be totally generic. In
Fusion, <a href="algorithms/transformation/functions/push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">push_back</span></tt></a> is actually a generic algorithm
that works on all sequences. Given an input sequence <tt class="computeroutput"><span class="identifier">s</span></tt>
and a value <tt class="computeroutput"><span class="identifier">x</span></tt>, Fusion's <a href="algorithms/transformation/functions/push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">push_back</span></tt></a> algorithm simply returns
a <a href="sequences/views/joint_view.html" title="joint_view"><tt class="computeroutput"><span class="identifier">joint_view</span></tt></a>:
a view that holds a reference to the original sequence <tt class="computeroutput"><span class="identifier">s</span></tt>
and the value <tt class="computeroutput"><span class="identifier">x</span></tt>. Functions
that were once sequence specific and need to be implemented N times over N
different sequences are now implemented only once. That is to say that Fusion
sequences are cheaply extensible. However, an important caveat is that the
result of a sequence extending operation like <a href="algorithms/transformation/functions/push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">push_back</span></tt></a> does not retain the properties
of the original sequence such as associativity of <span class="underline">_set</span>_s.
To regain the original sequence, <a href="sequences/conversion/functions.html" title="Functions">Conversion</a>
functions are provided. You may use one of the <a href="sequences/conversion/functions.html" title="Functions">Conversion</a>
functions to convert back to the original sequence type.
</p>
<a name="fusion.algorithms.header"></a><h3>
<a name="id549592"></a>
<a href="algorithms.html#fusion.algorithms.header">Header</a>
</h3>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.algorithms.concepts.polymorphic_function_object"></a><a href="polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
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<a name="fusion.algorithms.concepts.polymorphic_function_object.description"></a><h5>
<a name="id549717"></a>
<a href="polymorphic_function_object.html#fusion.algorithms.concepts.polymorphic_function_object.description">Description</a>
</h5>
<p>
A type of function object with a nested metafunction <tt class="computeroutput"><span class="identifier">result</span></tt>.
<tt class="computeroutput"><span class="identifier">result</span></tt> returns the result
type of calling the function object, given the argument types.
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">F</span></tt></span></dt>
<dd>
A Polymorphic Function Object type
</dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">f</span></tt></span></dt>
<dd>
A Polymorphic Function Object
</dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">T1</span>
<span class="special">...</span><span class="identifier">TN</span></tt></span></dt>
<dd>
Arbitrary types
</dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">t1</span>
<span class="special">...</span><span class="identifier">tN</span></tt></span></dt>
<dd>
Objects with types <tt class="computeroutput"><span class="identifier">T1</span> <span class="special">...</span><span class="identifier">TN</span></tt>
</dd>
</dl>
</div>
<a name="fusion.algorithms.concepts.polymorphic_function_object.refinement_of"></a><h5>
<a name="id549893"></a>
<a href="polymorphic_function_object.html#fusion.algorithms.concepts.polymorphic_function_object.refinement_of">Refinement
of</a>
</h5>
<p>
MPL Metafunction Class
</p>
<a name="fusion.algorithms.concepts.polymorphic_function_object.expression_requirements"></a><h5>
<a name="id549926"></a>
<a href="polymorphic_function_object.html#fusion.algorithms.concepts.polymorphic_function_object.expression_requirements">Expression
requirements</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Expression</th>
<th>Return Type</th>
<th>Runtime
Complexity</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">t1</span><span class="special">,</span><EFBFBD><span class="special">...</span><span class="identifier">tN</span><span class="special">)</span></tt></td>
<td><tt class="computeroutput"><span class="identifier">F</span><span class="special">::</span><span class="identifier">result</span><span class="special">&lt;</span><span class="identifier">T1</span><span class="special">,</span><EFBFBD><span class="special">...</span><span class="identifier">TN</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Unspecified</td>
</tr></tbody>
</table></div>
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<a name="fusion.algorithms.iteration"></a><a href="iteration.html" title="Iteration">Iteration</a></h3></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="iteration/functions.html">Functions</a></span></dt>
<dt><span class="section"><a href="iteration/metafunctions.html">Metafunctions</a></span></dt>
</dl></div>
<p>
The iteration algorithms provide the fundamental algorithms for traversing
a sequence repeatedly applying an operation to its elements.
</p>
<a name="fusion.algorithms.iteration.header"></a><h4>
<a name="id550118"></a>
<a href="iteration.html#fusion.algorithms.iteration.header">Header</a>
</h4>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">iteration</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
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<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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<dt><span class="section"><a href="functions/fold.html">fold</a></span></dt>
<dt><span class="section"><a href="functions/accumulate.html">accumulate</a></span></dt>
<dt><span class="section"><a href="functions/for_each.html">for_each</a></span></dt>
</dl></div>
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<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.iteration.functions.accumulate"></a><a href="accumulate.html" title="accumulate">accumulate</a></h5></div></div></div>
<a name="fusion.algorithms.iteration.functions.accumulate.description"></a><h6>
<a name="id551708"></a>
<a href="accumulate.html#fusion.algorithms.iteration.functions.accumulate.description">Description</a>
</h6>
<p>
Repeatedly applies binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a><EFBFBD><tt class="computeroutput"><span class="identifier">f</span></tt>
to each element of a sequence and the previous state. <a href="accumulate.html" title="accumulate"><tt class="computeroutput"><span class="identifier">accumulate</span></tt></a> is equivalent to
<a href="fold.html" title="fold"><tt class="computeroutput"><span class="identifier">fold</span></tt></a>.
</p>
<a name="fusion.algorithms.iteration.functions.accumulate.synopsis"></a><h6>
<a name="id551792"></a>
<a href="accumulate.html#fusion.algorithms.iteration.functions.accumulate.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">State</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/accumulate.html" title="accumulate"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">accumulate</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">accumulate</span><span class="special">(</span>
<span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">State</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">initial_state</span><span class="special">,</span> <span class="identifier">F</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id552052"></a><p class="title"><b>Table<EFBFBD>1.33.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">eN</span><EFBFBD><span class="special">....</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e2</span><span class="special">,</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><span class="identifier">initial_state</span><span class="special">)))</span></tt> must be a valid expression for
each element <tt class="computeroutput"><span class="identifier">e1</span></tt> to
<tt class="computeroutput"><span class="identifier">eN</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">initial_state</span></tt></td>
<td>Any
type</td>
<td>Initial state</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
model of binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.iteration.functions.accumulate.expression_semantics"></a><h6>
<a name="id552284"></a>
<a href="accumulate.html#fusion.algorithms.iteration.functions.accumulate.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">accumulate</span><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">initial_state</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Equivalent to <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">eN</span><EFBFBD><span class="special">....</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e2</span><span class="special">,</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><span class="identifier">initial_state</span><span class="special">)))</span></tt>
where <tt class="computeroutput"><span class="identifier">e1</span><EFBFBD><span class="special">...</span><span class="identifier">eN</span></tt> are the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.iteration.functions.accumulate.complexity"></a><h6>
<a name="id552490"></a>
<a href="accumulate.html#fusion.algorithms.iteration.functions.accumulate.complexity">Complexity</a>
</h6>
<p>
Linear, exactly <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> applications of <tt class="computeroutput"><span class="identifier">f</span></tt>.
</p>
<a name="fusion.algorithms.iteration.functions.accumulate.header"></a><h6>
<a name="id552582"></a>
<a href="accumulate.html#fusion.algorithms.iteration.functions.accumulate.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">iteration</span><span class="special">/</span><span class="identifier">accumulate</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.iteration.functions.accumulate.example"></a><h6>
<a name="id552688"></a>
<a href="accumulate.html#fusion.algorithms.iteration.functions.accumulate.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">struct</span> <span class="identifier">make_string</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">State</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">T</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&amp;</span> <span class="identifier">str</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">str</span> <span class="special">+</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">lexical_cast</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;(</span><span class="identifier">t</span><span class="special">);</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">...</span>
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="accumulate.html" title="accumulate"><tt class="computeroutput"><span class="identifier">accumulate</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="string">""</span><span class="special">),</span> <span class="identifier">make_string</span><span class="special">())</span> <span class="special">==</span> <span class="string">"12"</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
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<html>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.iteration.functions.fold"></a><a href="fold.html" title="fold">fold</a></h5></div></div></div>
<a name="fusion.algorithms.iteration.functions.fold.description"></a><h6>
<a name="id550254"></a>
<a href="fold.html#fusion.algorithms.iteration.functions.fold.description">Description</a>
</h6>
<p>
Repeatedly applies binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a><EFBFBD><tt class="computeroutput"><span class="identifier">f</span></tt>
to each element of a sequence and the previous state.
</p>
<a name="fusion.algorithms.iteration.functions.fold.synopsis"></a><h6>
<a name="id550303"></a>
<a href="fold.html#fusion.algorithms.iteration.functions.fold.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">State</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/fold.html" title="fold"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">fold</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">fold</span><span class="special">(</span>
<span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">State</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">initial_state</span><span class="special">,</span> <span class="identifier">F</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id550562"></a><p class="title"><b>Table<EFBFBD>1.32.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>,<tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> must be a valid expression for each
element <tt class="computeroutput"><span class="identifier">e</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">initial_state</span></tt></td>
<td>Any
type</td>
<td>Initial state</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
model of binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.iteration.functions.fold.expression_semantics"></a><h6>
<a name="id550730"></a>
<a href="fold.html#fusion.algorithms.iteration.functions.fold.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">fold</span><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">initial_state</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Equivalent to <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">eN</span><EFBFBD><span class="special">....</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e2</span><span class="special">,</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><span class="identifier">initial_state</span><span class="special">)))</span></tt>
where <tt class="computeroutput"><span class="identifier">e1</span><EFBFBD><span class="special">...</span><span class="identifier">eN</span></tt> are the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.iteration.functions.fold.complexity"></a><h6>
<a name="id550935"></a>
<a href="fold.html#fusion.algorithms.iteration.functions.fold.complexity">Complexity</a>
</h6>
<p>
Linear, exactly <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> applications of <tt class="computeroutput"><span class="identifier">f</span></tt>.
</p>
<a name="fusion.algorithms.iteration.functions.fold.header"></a><h6>
<a name="id551027"></a>
<a href="fold.html#fusion.algorithms.iteration.functions.fold.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">iteration</span><span class="special">/</span><span class="identifier">fold</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.iteration.functions.fold.example"></a><h6>
<a name="id551132"></a>
<a href="fold.html#fusion.algorithms.iteration.functions.fold.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">struct</span> <span class="identifier">make_string</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">State</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">T</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&amp;</span> <span class="identifier">str</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">str</span> <span class="special">+</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">lexical_cast</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;(</span><span class="identifier">t</span><span class="special">);</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">...</span>
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="fold.html" title="fold"><tt class="computeroutput"><span class="identifier">fold</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="string">""</span><span class="special">),</span> <span class="identifier">make_string</span><span class="special">())</span> <span class="special">==</span> <span class="string">"12"</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="../functions.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="accumulate.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>for_each</title>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.iteration.functions.for_each"></a><a href="for_each.html" title="for_each">for_each</a></h5></div></div></div>
<a name="fusion.algorithms.iteration.functions.for_each.description"></a><h6>
<a name="id553260"></a>
<a href="for_each.html#fusion.algorithms.iteration.functions.for_each.description">Description</a>
</h6>
<p>
Applies a unary function object to each element of a sequence.
</p>
<a name="fusion.algorithms.iteration.functions.for_each.synopsis"></a><h6>
<a name="id553292"></a>
<a href="for_each.html#fusion.algorithms.iteration.functions.for_each.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">for_each</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">for_each</span><span class="special">(</span>
<span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">F</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id553494"></a><p class="title"><b>Table<EFBFBD>1.34.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> must be a valid expression for each
element <tt class="computeroutput"><span class="identifier">e</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
unary function object</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.iteration.functions.for_each.expression_semantics"></a><h6>
<a name="id553633"></a>
<a href="for_each.html#fusion.algorithms.iteration.functions.for_each.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">for_each</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">void</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Calls <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> for each element <tt class="computeroutput"><span class="identifier">e</span></tt>
in <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.iteration.functions.for_each.complexity"></a><h6>
<a name="id553784"></a>
<a href="for_each.html#fusion.algorithms.iteration.functions.for_each.complexity">Complexity</a>
</h6>
<p>
Linear, exactly <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> applications of <tt class="computeroutput"><span class="identifier">f</span></tt>.
</p>
<a name="fusion.algorithms.iteration.functions.for_each.header"></a><h6>
<a name="id553877"></a>
<a href="for_each.html#fusion.algorithms.iteration.functions.for_each.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">iteration</span><span class="special">/</span><span class="identifier">for_each</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.iteration.functions.for_each.example"></a><h6>
<a name="id553982"></a>
<a href="for_each.html#fusion.algorithms.iteration.functions.for_each.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">struct</span> <span class="identifier">increment</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="special">++</span><span class="identifier">t</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">...</span>
<a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
<a href="for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">for_each</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span> <span class="identifier">increment</span><span class="special">());</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">vec</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">));</span>
</pre>
</div>
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<a name="fusion.algorithms.iteration.metafunctions"></a><a href="metafunctions.html" title="Metafunctions">Metafunctions</a></h4></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="metafunctions/fold.html">fold</a></span></dt>
<dt><span class="section"><a href="metafunctions/accumulate.html">accumulate</a></span></dt>
<dt><span class="section"><a href="metafunctions/for_each.html">for_each</a></span></dt>
</dl></div>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.iteration.metafunctions.accumulate"></a><a href="accumulate.html" title="accumulate">accumulate</a></h5></div></div></div>
<a name="fusion.algorithms.iteration.metafunctions.accumulate.description"></a><h6>
<a name="id555076"></a>
<a href="accumulate.html#fusion.algorithms.iteration.metafunctions.accumulate.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/accumulate.html" title="accumulate"><tt class="computeroutput"><span class="identifier">accumulate</span></tt></a>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.accumulate.synopsis"></a><h6>
<a name="id555125"></a>
<a href="accumulate.html#fusion.algorithms.iteration.metafunctions.accumulate.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">State</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">accumulate</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id555259"></a><p class="title"><b>Table<EFBFBD>1.36.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>The sequence to iterate</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">State</span></tt></td>
<td>Any
type</td>
<td>The initial state for the first application of
<tt class="computeroutput"><span class="identifier">F</span></tt>
</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
model of binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>The operation to be applied
on forward traversal</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.iteration.metafunctions.accumulate.expression_semantics"></a><h6>
<a name="id555393"></a>
<a href="accumulate.html#fusion.algorithms.iteration.metafunctions.accumulate.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="accumulate.html" title="accumulate"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">accumulate</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the result of applying
<tt class="computeroutput"><span class="identifier">accumulate</span></tt> to a sequence
of type <tt class="computeroutput"><span class="identifier">Sequence</span></tt>, with
an initial state of type <tt class="computeroutput"><span class="identifier">State</span></tt>
and binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a> of type <tt class="computeroutput"><span class="identifier">F</span></tt>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.accumulate.complexity"></a><h6>
<a name="id555571"></a>
<a href="accumulate.html#fusion.algorithms.iteration.metafunctions.accumulate.complexity">Complexity</a>
</h6>
<p>
Linear, exactly <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> applications of <tt class="computeroutput"><span class="identifier">F</span></tt>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.accumulate.header"></a><h6>
<a name="id555664"></a>
<a href="accumulate.html#fusion.algorithms.iteration.metafunctions.accumulate.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">iteration</span><span class="special">/</span><span class="identifier">accumulate</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="fold.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="for_each.html"><img src="../../../../images/next.png" alt="Next"></a>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.iteration.metafunctions.fold"></a><a href="fold.html" title="fold">fold</a></h5></div></div></div>
<a name="fusion.algorithms.iteration.metafunctions.fold.description"></a><h6>
<a name="id554364"></a>
<a href="fold.html#fusion.algorithms.iteration.metafunctions.fold.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/fold.html" title="fold"><tt class="computeroutput"><span class="identifier">fold</span></tt></a>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.fold.synopsis"></a><h6>
<a name="id554412"></a>
<a href="fold.html#fusion.algorithms.iteration.metafunctions.fold.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">State</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">fold</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id554546"></a><p class="title"><b>Table<EFBFBD>1.35.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>The sequence to iterate</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">State</span></tt></td>
<td>Any
type</td>
<td>The initial state for the first application of
<tt class="computeroutput"><span class="identifier">F</span></tt>
</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
model of binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>The operation to be applied
on forward traversal</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.iteration.metafunctions.fold.expression_semantics"></a><h6>
<a name="id554681"></a>
<a href="fold.html#fusion.algorithms.iteration.metafunctions.fold.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="fold.html" title="fold"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">fold</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the result of applying
<tt class="computeroutput"><span class="identifier">fold</span></tt> to a sequence of
type <tt class="computeroutput"><span class="identifier">Sequence</span></tt>, with an
initial state of type <tt class="computeroutput"><span class="identifier">State</span></tt>
and binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a> of type <tt class="computeroutput"><span class="identifier">F</span></tt>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.fold.complexity"></a><h6>
<a name="id554859"></a>
<a href="fold.html#fusion.algorithms.iteration.metafunctions.fold.complexity">Complexity</a>
</h6>
<p>
Linear, exactly <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> applications of <tt class="computeroutput"><span class="identifier">F</span></tt>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.fold.header"></a><h6>
<a name="id554950"></a>
<a href="fold.html#fusion.algorithms.iteration.metafunctions.fold.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">iteration</span><span class="special">/</span><span class="identifier">fold</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="../metafunctions.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="accumulate.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>for_each</title>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.iteration.metafunctions.for_each"></a><a href="for_each.html" title="for_each">for_each</a></h5></div></div></div>
<p>
A metafunction returning the result type of applying <a href="../functions/for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">for_each</span></tt></a> to a sequence. The
return type of <a href="../functions/for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">for_each</span></tt></a> is always <tt class="computeroutput"><span class="keyword">void</span></tt>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.for_each.description"></a><h6>
<a name="id555840"></a>
<a href="for_each.html#fusion.algorithms.iteration.metafunctions.for_each.description">Description</a>
</h6>
<a name="fusion.algorithms.iteration.metafunctions.for_each.synopsis"></a><h6>
<a name="id555867"></a>
<a href="for_each.html#fusion.algorithms.iteration.metafunctions.for_each.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">for_each</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">void</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id555988"></a><p class="title"><b>Table<EFBFBD>1.37.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>Any
type</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.iteration.metafunctions.for_each.expression_semantics"></a><h6>
<a name="id556084"></a>
<a href="for_each.html#fusion.algorithms.iteration.metafunctions.for_each.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">for_each</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">void</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">for_each</span></tt></a> for a sequence of type
<tt class="computeroutput"><span class="identifier">Sequence</span></tt> and a unary
function object <tt class="computeroutput"><span class="identifier">F</span></tt>. The
return type is always <tt class="computeroutput"><span class="keyword">void</span></tt>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.for_each.complexity"></a><h6>
<a name="id556257"></a>
<a href="for_each.html#fusion.algorithms.iteration.metafunctions.for_each.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.iteration.metafunctions.for_each.header"></a><h6>
<a name="id556289"></a>
<a href="for_each.html#fusion.algorithms.iteration.metafunctions.for_each.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">iteration</span><span class="special">/</span><span class="identifier">for_each</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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<title>Query</title>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.algorithms.query"></a><a href="query.html" title="Query">Query</a></h3></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="query/functions.html">Functions</a></span></dt>
<dt><span class="section"><a href="query/metafunctions.html">Metafunctions</a></span></dt>
</dl></div>
<p>
The query algorithms provide support for searching and analyzing sequences.
</p>
<a name="fusion.algorithms.query.header"></a><h4>
<a name="id556421"></a>
<a href="query.html#fusion.algorithms.query.header">Header</a>
</h4>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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<a accesskey="p" href="iteration/metafunctions/for_each.html"><img src="../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../algorithms.html"><img src="../../images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="query/functions.html"><img src="../../images/next.png" alt="Next"></a>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.algorithms.query.functions"></a><a href="functions.html" title="Functions">Functions</a></h4></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="functions/any.html">any</a></span></dt>
<dt><span class="section"><a href="functions/all.html">all</a></span></dt>
<dt><span class="section"><a href="functions/none.html">none</a></span></dt>
<dt><span class="section"><a href="functions/find.html">find</a></span></dt>
<dt><span class="section"><a href="functions/find_if.html">find_if</a></span></dt>
<dt><span class="section"><a href="functions/count.html">count</a></span></dt>
<dt><span class="section"><a href="functions/count_if.html">count_if</a></span></dt>
</dl></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>all</title>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.functions.all"></a><a href="all.html" title="all">all</a></h5></div></div></div>
<a name="fusion.algorithms.query.functions.all.description"></a><h6>
<a name="id557682"></a>
<a href="all.html#fusion.algorithms.query.functions.all.description">Description</a>
</h6>
<p>
For a sequence <tt class="computeroutput"><span class="identifier">seq</span></tt> and
unary function object <tt class="computeroutput"><span class="identifier">f</span></tt>,
<tt class="computeroutput"><span class="identifier">all</span></tt> returns true if
<tt class="computeroutput"><span class="identifier">f</span></tt> returns true for every
element of <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.query.functions.all.synopsis"></a><h6>
<a name="id557764"></a>
<a href="all.html#fusion.algorithms.query.functions.all.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/all.html" title="all"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">all</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span><span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">all</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">F</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id557957"></a><p class="title"><b>Table<EFBFBD>1.39.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> is a valid expression, convertible
to <tt class="computeroutput"><span class="keyword">bool</span></tt>, for every element
<tt class="computeroutput"><span class="identifier">e</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>The sequence
to search</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
unary function object</td>
<td>The search predicate</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.functions.all.expression_semantics"></a><h6>
<a name="id558106"></a>
<a href="all.html#fusion.algorithms.query.functions.all.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="all.html" title="all"><tt class="computeroutput"><span class="identifier">all</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns true if and only
if <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt>
evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt> for every
element <tt class="computeroutput"><span class="identifier">e</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.query.functions.all.complexity"></a><h6>
<a name="id558269"></a>
<a href="all.html#fusion.algorithms.query.functions.all.complexity">Complexity</a>
</h6>
<p>
Linear. At most <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> comparisons.
</p>
<a name="fusion.algorithms.query.functions.all.header"></a><h6>
<a name="id558351"></a>
<a href="all.html#fusion.algorithms.query.functions.all.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">all</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.query.functions.all.example"></a><h6>
<a name="id558456"></a>
<a href="all.html#fusion.algorithms.query.functions.all.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">struct</span> <span class="identifier">odd</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">t</span> <span class="special">%</span> <span class="number">2</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">...</span>
<span class="identifier">assert</span><span class="special">(</span><a href="all.html" title="all"><tt class="computeroutput"><span class="identifier">all</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">3</span><span class="special">),</span> <span class="identifier">odd</span><span class="special">()));</span>
<span class="identifier">assert</span><span class="special">(!</span><a href="all.html" title="all"><tt class="computeroutput"><span class="identifier">all</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">),</span> <span class="identifier">odd</span><span class="special">()));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.functions.any"></a><a href="any.html" title="any">any</a></h5></div></div></div>
<a name="fusion.algorithms.query.functions.any.description"></a><h6>
<a name="id556556"></a>
<a href="any.html#fusion.algorithms.query.functions.any.description">Description</a>
</h6>
<p>
For a sequence <tt class="computeroutput"><span class="identifier">seq</span></tt> and
unary function object <tt class="computeroutput"><span class="identifier">f</span></tt>,
<tt class="computeroutput"><span class="identifier">any</span></tt> returns true if
<tt class="computeroutput"><span class="identifier">f</span></tt> returns true for at
least one element of <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.query.functions.any.synopsis"></a><h6>
<a name="id556637"></a>
<a href="any.html#fusion.algorithms.query.functions.any.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/any.html" title="any"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">any</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span><span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">any</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">F</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id556829"></a><p class="title"><b>Table<EFBFBD>1.38.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> must be a valid expression, convertible
to <tt class="computeroutput"><span class="keyword">bool</span></tt>, for each element
<tt class="computeroutput"><span class="identifier">e</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>The sequence
to search</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
unary function object</td>
<td>The search predicate</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.functions.any.expression_semantics"></a><h6>
<a name="id556980"></a>
<a href="any.html#fusion.algorithms.query.functions.any.expression_semantics">Expression
semantics</a>
</h6>
<pre class="programlisting">
<a href="any.html" title="any"><tt class="computeroutput"><span class="identifier">any</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns true if and only
if <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt>
evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt> for some
element <tt class="computeroutput"><span class="identifier">e</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.query.functions.any.complexity"></a><h6>
<a name="id557142"></a>
<a href="any.html#fusion.algorithms.query.functions.any.complexity">Complexity</a>
</h6>
<p>
Linear. At most <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> comparisons.
</p>
<a name="fusion.algorithms.query.functions.any.header"></a><h6>
<a name="id557225"></a>
<a href="any.html#fusion.algorithms.query.functions.any.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">any</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.query.functions.any.example"></a><h6>
<a name="id557329"></a>
<a href="any.html#fusion.algorithms.query.functions.any.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">struct</span> <span class="identifier">odd</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">t</span> <span class="special">%</span> <span class="number">2</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">...</span>
<span class="identifier">assert</span><span class="special">(</span><a href="any.html" title="any"><tt class="computeroutput"><span class="identifier">any</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">),</span> <span class="identifier">odd</span><span class="special">()));</span>
<span class="identifier">assert</span><span class="special">(!</span><a href="any.html" title="any"><tt class="computeroutput"><span class="identifier">any</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">2</span><span class="special">,</span><span class="number">4</span><span class="special">),</span> <span class="identifier">odd</span><span class="special">()));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="../functions.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="all.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>count</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.functions.count"></a><a href="count.html" title="count">count</a></h5></div></div></div>
<a name="fusion.algorithms.query.functions.count.description"></a><h6>
<a name="id562093"></a>
<a href="count.html#fusion.algorithms.query.functions.count.description">Description</a>
</h6>
<p>
Returns the number of elements of a given type within a sequence.
</p>
<a name="fusion.algorithms.query.functions.count.synopsis"></a><h6>
<a name="id562124"></a>
<a href="count.html#fusion.algorithms.query.functions.count.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/count.html" title="count"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">count</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">count</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id562331"></a><p class="title"><b>Table<EFBFBD>1.43.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, <tt class="computeroutput"><span class="identifier">e</span><EFBFBD><span class="special">==</span><EFBFBD><span class="identifier">t</span></tt>
must be a valid expression, convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>,
for each element <tt class="computeroutput"><span class="identifier">e</span></tt>
in <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>The
sequence to search</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>The type to count</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.functions.count.expression_semantics"></a><h6>
<a name="id562479"></a>
<a href="count.html#fusion.algorithms.query.functions.count.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="count.html" title="count"><tt class="computeroutput"><span class="identifier">count</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">int</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the number of elements
of type <tt class="computeroutput"><span class="identifier">T</span></tt> and equal to
<tt class="computeroutput"><span class="identifier">t</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.query.functions.count.complexity"></a><h6>
<a name="id562616"></a>
<a href="count.html#fusion.algorithms.query.functions.count.complexity">Complexity</a>
</h6>
<p>
Linear. At most <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> comparisons.
</p>
<a name="fusion.algorithms.query.functions.count.header"></a><h6>
<a name="id562698"></a>
<a href="count.html#fusion.algorithms.query.functions.count.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">count</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.query.functions.count.example"></a><h6>
<a name="id562803"></a>
<a href="count.html#fusion.algorithms.query.functions.count.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1.0</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="count.html" title="count"><tt class="computeroutput"><span class="identifier">count</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span><span class="number">2</span><span class="special">)</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="find_if.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="count_if.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>count_if</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.functions.count_if"></a><a href="count_if.html" title="count_if">count_if</a></h5></div></div></div>
<a name="fusion.algorithms.query.functions.count_if.description"></a><h6>
<a name="id563018"></a>
<a href="count_if.html#fusion.algorithms.query.functions.count_if.description">Description</a>
</h6>
<p>
Returns the number of elements within a sequence with a type for which
a given unary function object evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt>.
</p>
<a name="fusion.algorithms.query.functions.count_if.synopsis"></a><h6>
<a name="id563061"></a>
<a href="count_if.html#fusion.algorithms.query.functions.count_if.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/count_if.html" title="count_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">count_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">count_if</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">F</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id563256"></a><p class="title"><b>Table<EFBFBD>1.44.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> is a valid expression, convertible
to <tt class="computeroutput"><span class="keyword">bool</span></tt>, for each element
<tt class="computeroutput"><span class="identifier">e</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>The sequence
to search</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
unary function object</td>
<td>The search predicate</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.functions.count_if.expression_semantics"></a><h6>
<a name="id563405"></a>
<a href="count_if.html#fusion.algorithms.query.functions.count_if.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="count_if.html" title="count_if"><tt class="computeroutput"><span class="identifier">count_if</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">f</span><span class="special">)</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">int</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the number of elements
in <tt class="computeroutput"><span class="identifier">seq</span></tt> where <tt class="computeroutput"><span class="identifier">f</span></tt> evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt>.
</p>
<a name="fusion.algorithms.query.functions.count_if.complexity"></a><h6>
<a name="id563542"></a>
<a href="count_if.html#fusion.algorithms.query.functions.count_if.complexity">Complexity</a>
</h6>
<p>
Linear. At most <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> comparisons.
</p>
<a name="fusion.algorithms.query.functions.count_if.header"></a><h6>
<a name="id563624"></a>
<a href="count_if.html#fusion.algorithms.query.functions.count_if.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">count_if</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.query.functions.count_if.example"></a><h6>
<a name="id563730"></a>
<a href="count_if.html#fusion.algorithms.query.functions.count_if.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="count_if.html" title="count_if"><tt class="computeroutput"><span class="identifier">count_if</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span><span class="identifier">odd</span><span class="special">())</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
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<a accesskey="p" href="count.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="../metafunctions.html"><img src="../../../../images/next.png" alt="Next"></a>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.functions.find"></a><a href="find.html" title="find">find</a></h5></div></div></div>
<a name="fusion.algorithms.query.functions.find.description"></a><h6>
<a name="id559978"></a>
<a href="find.html#fusion.algorithms.query.functions.find.description">Description</a>
</h6>
<p>
Finds the first element of a given type within a sequence.
</p>
<a name="fusion.algorithms.query.functions.find.synopsis"></a><h6>
<a name="id560010"></a>
<a href="find.html#fusion.algorithms.query.functions.find.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="emphasis"><em>unspecified</em></span> <span class="identifier">find</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="emphasis"><em>unspecified</em></span> <span class="identifier">find</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id560208"></a><p class="title"><b>Table<EFBFBD>1.41.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>The sequence to search</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>The type to search for</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.functions.find.expression_semantics"></a><h6>
<a name="id560302"></a>
<a href="find.html#fusion.algorithms.query.functions.find.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="find.html" title="find"><tt class="computeroutput"><span class="identifier">find</span></tt></a><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">)</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
category as the iterators of <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
first element of <tt class="computeroutput"><span class="identifier">seq</span></tt>
of type <tt class="computeroutput"><span class="identifier">T</span></tt>, or <tt class="computeroutput"><a href="../../../sequences/intrinsics/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">)</span></tt> if there is no such element. Equivalent
to <tt class="computeroutput"><a href="find_if.html" title="find_if"><tt class="computeroutput"><span class="identifier">find_if</span></tt></a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><span class="identifier">_</span><span class="special">,</span><EFBFBD><span class="identifier">T</span><span class="special">&gt;</span><EFBFBD><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">)</span></tt>
</p>
<a name="fusion.algorithms.query.functions.find.complexity"></a><h6>
<a name="id560548"></a>
<a href="find.html#fusion.algorithms.query.functions.find.complexity">Complexity</a>
</h6>
<p>
Linear. At most <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> comparisons.
</p>
<a name="fusion.algorithms.query.functions.find.header"></a><h6>
<a name="id560630"></a>
<a href="find.html#fusion.algorithms.query.functions.find.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">find</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.query.functions.find.example"></a><h6>
<a name="id560735"></a>
<a href="find.html#fusion.algorithms.query.functions.find.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="char">'a'</span><span class="special">,</span><span class="char">'0'</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(*</span><a href="find.html" title="find"><tt class="computeroutput"><span class="identifier">find</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;(</span><span class="identifier">vec</span><span class="special">)</span> <span class="special">==</span> <span class="char">'0'</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="find.html" title="find"><tt class="computeroutput"><span class="identifier">find</span></tt></a><span class="special">&lt;</span><span class="keyword">double</span><span class="special">&gt;(</span><span class="identifier">vec</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/intrinsics/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.functions.find_if"></a><a href="find_if.html" title="find_if">find_if</a></h5></div></div></div>
<p>
Finds the first element within a sequence with a type for which a given
MPL Lambda Expression evaluates to <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>.
</p>
<a name="fusion.algorithms.query.functions.find_if.description"></a><h6>
<a name="id561053"></a>
<a href="find_if.html#fusion.algorithms.query.functions.find_if.description">Description</a>
</h6>
<a name="fusion.algorithms.query.functions.find_if.synopsis"></a><h6>
<a name="id561080"></a>
<a href="find_if.html#fusion.algorithms.query.functions.find_if.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="emphasis"><em>unspecified</em></span> <span class="identifier">find_if</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="emphasis"><em>unspecified</em></span> <span class="identifier">find_if</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id561279"></a><p class="title"><b>Table<EFBFBD>1.42.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>The sequence to search</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
unary MPL Lambda Expression</td>
<td>The search predicate</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.functions.find_if.expression_semantics"></a><h6>
<a name="id561373"></a>
<a href="find_if.html#fusion.algorithms.query.functions.find_if.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="find_if.html" title="find_if"><tt class="computeroutput"><span class="identifier">find_if</span></tt></a><span class="special">&lt;</span><span class="identifier">F</span><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">)</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: An iterator of the same
iterator category as the iterators of <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the first element
of <tt class="computeroutput"><span class="identifier">seq</span></tt> for which MPL
Lambda Expression <tt class="computeroutput"><span class="identifier">F</span></tt> evaluates
to <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>, or <tt class="computeroutput"><a href="../../../sequences/intrinsics/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">)</span></tt>
if there is no such element.
</p>
<a name="fusion.algorithms.query.functions.find_if.complexity"></a><h6>
<a name="id561566"></a>
<a href="find_if.html#fusion.algorithms.query.functions.find_if.complexity">Complexity</a>
</h6>
<p>
Linear. At most <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> comparisons.
</p>
<a name="fusion.algorithms.query.functions.find_if.header"></a><h6>
<a name="id561648"></a>
<a href="find_if.html#fusion.algorithms.query.functions.find_if.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">find_if</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.query.functions.find_if.example"></a><h6>
<a name="id561753"></a>
<a href="find_if.html#fusion.algorithms.query.functions.find_if.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1.0</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(*</span><a href="find_if.html" title="find_if"><tt class="computeroutput"><span class="identifier">find_if</span></tt></a><span class="special">&lt;</span><span class="identifier">is_integral</span><span class="special">&lt;</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">_</span><span class="special">&gt;</span> <span class="special">&gt;(</span><span class="identifier">vec</span><span class="special">)</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="find_if.html" title="find_if"><tt class="computeroutput"><span class="identifier">find_if</span></tt></a><span class="special">&lt;</span><span class="identifier">is_class</span><span class="special">&lt;</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">_</span><span class="special">&gt;</span> <span class="special">&gt;(</span><span class="identifier">vec</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/intrinsics/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="find.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="count.html"><img src="../../../../images/next.png" alt="Next"></a>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.functions.none"></a><a href="none.html" title="none">none</a></h5></div></div></div>
<a name="fusion.algorithms.query.functions.none.description"></a><h6>
<a name="id558809"></a>
<a href="none.html#fusion.algorithms.query.functions.none.description">Description</a>
</h6>
<p>
For a sequence <tt class="computeroutput"><span class="identifier">seq</span></tt> and
unary function object <tt class="computeroutput"><span class="identifier">f</span></tt>,
<tt class="computeroutput"><span class="identifier">none</span></tt> returns true if
<tt class="computeroutput"><span class="identifier">f</span></tt> returns false for every
element of <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.query.functions.none.synopsis"></a><h6>
<a name="id558890"></a>
<a href="none.html#fusion.algorithms.query.functions.none.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/none.html" title="none"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">none</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span><span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">none</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">F</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id559083"></a><p class="title"><b>Table<EFBFBD>1.40.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> is a valid expression, convertible
to <tt class="computeroutput"><span class="keyword">bool</span></tt>, for every element
<tt class="computeroutput"><span class="identifier">e</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>The sequence
to search</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
unary function object</td>
<td>The search predicate</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.functions.none.expression_semantics"></a><h6>
<a name="id559234"></a>
<a href="none.html#fusion.algorithms.query.functions.none.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="none.html" title="none"><tt class="computeroutput"><span class="identifier">none</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns true if and only
if <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt>
evaluates to <tt class="computeroutput"><span class="keyword">false</span></tt> for every
element <tt class="computeroutput"><span class="identifier">e</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>. Result equivalent to <tt class="computeroutput"><span class="special">!</span><span class="identifier">any</span><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span><EFBFBD><span class="identifier">f</span><span class="special">)</span></tt>.
</p>
<a name="fusion.algorithms.query.functions.none.complexity"></a><h6>
<a name="id559437"></a>
<a href="none.html#fusion.algorithms.query.functions.none.complexity">Complexity</a>
</h6>
<p>
Linear. At most <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> comparisons.
</p>
<a name="fusion.algorithms.query.functions.none.header"></a><h6>
<a name="id559520"></a>
<a href="none.html#fusion.algorithms.query.functions.none.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">none</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.query.functions.none.example"></a><h6>
<a name="id559624"></a>
<a href="none.html#fusion.algorithms.query.functions.none.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">struct</span> <span class="identifier">odd</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">t</span> <span class="special">%</span> <span class="number">2</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">...</span>
<span class="identifier">assert</span><span class="special">(</span><a href="none.html" title="none"><tt class="computeroutput"><span class="identifier">none</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">2</span><span class="special">,</span><span class="number">4</span><span class="special">),</span> <span class="identifier">odd</span><span class="special">()));</span>
<span class="identifier">assert</span><span class="special">(!</span><a href="none.html" title="none"><tt class="computeroutput"><span class="identifier">none</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">),</span> <span class="identifier">odd</span><span class="special">()));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
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<a accesskey="p" href="all.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="find.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Metafunctions</title>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.algorithms.query.metafunctions"></a><a href="metafunctions.html" title="Metafunctions">Metafunctions</a></h4></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="metafunctions/any.html">any</a></span></dt>
<dt><span class="section"><a href="metafunctions/all.html">all</a></span></dt>
<dt><span class="section"><a href="metafunctions/none.html">none</a></span></dt>
<dt><span class="section"><a href="metafunctions/find.html">find</a></span></dt>
<dt><span class="section"><a href="metafunctions/find_if.html">find_if</a></span></dt>
<dt><span class="section"><a href="metafunctions/count.html">count</a></span></dt>
<dt><span class="section"><a href="metafunctions/count_if.html">count_if</a></span></dt>
</dl></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>all</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.all"></a><a href="all.html" title="all">all</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.all.description"></a><h6>
<a name="id564572"></a>
<a href="all.html#fusion.algorithms.query.metafunctions.all.description">Description</a>
</h6>
<p>
A metafunction returning the result type of <a href="../functions/all.html" title="all"><tt class="computeroutput"><span class="identifier">all</span></tt></a>.
</p>
<a name="fusion.algorithms.query.metafunctions.all.synopsis"></a><h6>
<a name="id564620"></a>
<a href="all.html#fusion.algorithms.query.metafunctions.all.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">all</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">bool</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id564740"></a><p class="title"><b>Table<EFBFBD>1.46.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
model of unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.all.expression_semantics"></a><h6>
<a name="id564843"></a>
<a href="all.html#fusion.algorithms.query.metafunctions.all.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="all.html" title="all"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">all</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/all.html" title="all"><tt class="computeroutput"><span class="identifier">all</span></tt></a>
given a sequence of type <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
and a unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a> of type <tt class="computeroutput"><span class="identifier">F</span></tt>.
The return type is always <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<a name="fusion.algorithms.query.metafunctions.all.complexity"></a><h6>
<a name="id565023"></a>
<a href="all.html#fusion.algorithms.query.metafunctions.all.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.query.metafunctions.all.header"></a><h6>
<a name="id565054"></a>
<a href="all.html#fusion.algorithms.query.metafunctions.all.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">all</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="any.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="none.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.any"></a><a href="any.html" title="any">any</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.any.description"></a><h6>
<a name="id563967"></a>
<a href="any.html#fusion.algorithms.query.metafunctions.any.description">Description</a>
</h6>
<p>
A metafunction returning the result type of <a href="../functions/any.html" title="any"><tt class="computeroutput"><span class="identifier">any</span></tt></a>.
</p>
<a name="fusion.algorithms.query.metafunctions.any.synopsis"></a><h6>
<a name="id564014"></a>
<a href="any.html#fusion.algorithms.query.metafunctions.any.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">any</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">bool</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id564134"></a><p class="title"><b>Table<EFBFBD>1.45.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
model of unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.any.expression_semantics"></a><h6>
<a name="id564236"></a>
<a href="any.html#fusion.algorithms.query.metafunctions.any.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="any.html" title="any"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">any</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/any.html" title="any"><tt class="computeroutput"><span class="identifier">any</span></tt></a>
given a sequence of type <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
and a unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a> of type <tt class="computeroutput"><span class="identifier">F</span></tt>.
The return type is always <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<a name="fusion.algorithms.query.metafunctions.any.complexity"></a><h6>
<a name="id564417"></a>
<a href="any.html#fusion.algorithms.query.metafunctions.any.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.query.metafunctions.any.header"></a><h6>
<a name="id564448"></a>
<a href="any.html#fusion.algorithms.query.metafunctions.any.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">any</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="../metafunctions.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="all.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>count</title>
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<a accesskey="p" href="find_if.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="count_if.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.count"></a><a href="count.html" title="count">count</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.count.description"></a><h6>
<a name="id567110"></a>
<a href="count.html#fusion.algorithms.query.metafunctions.count.description">Description</a>
</h6>
<p>
A metafunction that returns the result type of <tt class="computeroutput"><span class="identifier">count</span></tt>
given the sequence and search types.
</p>
<a name="fusion.algorithms.query.metafunctions.count.synopsis"></a><h6>
<a name="id567153"></a>
<a href="count.html#fusion.algorithms.query.metafunctions.count.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">count</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">int</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id567273"></a><p class="title"><b>Table<EFBFBD>1.50.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>heading
Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.count.expression_semantics"></a><h6>
<a name="id567368"></a>
<a href="count.html#fusion.algorithms.query.metafunctions.count.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="count.html" title="count"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">count</span></tt></a><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">int</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/count.html" title="count"><tt class="computeroutput"><span class="identifier">count</span></tt></a>. The return type is always
<tt class="computeroutput"><span class="keyword">int</span></tt>.
</p>
<a name="fusion.algorithms.query.metafunctions.count.complexity"></a><h6>
<a name="id567507"></a>
<a href="count.html#fusion.algorithms.query.metafunctions.count.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.query.metafunctions.count.header"></a><h6>
<a name="id567537"></a>
<a href="count.html#fusion.algorithms.query.metafunctions.count.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">count</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.count_if"></a><a href="count_if.html" title="count_if">count_if</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.count_if.description"></a><h6>
<a name="id567663"></a>
<a href="count_if.html#fusion.algorithms.query.metafunctions.count_if.description">Description</a>
</h6>
<p>
A metafunction that returns the result type of <tt class="computeroutput"><span class="identifier">count_if</span></tt>
given the sequence and predicate types.
</p>
<a name="fusion.algorithms.query.metafunctions.count_if.synopsis"></a><h6>
<a name="id567706"></a>
<a href="count_if.html#fusion.algorithms.query.metafunctions.count_if.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Pred</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">count_if</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">int</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id567826"></a><p class="title"><b>Table<EFBFBD>1.51.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Pred</span></tt></td>
<td>A
unary function object</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.count_if.expression_semantics"></a><h6>
<a name="id567921"></a>
<a href="count_if.html#fusion.algorithms.query.metafunctions.count_if.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="count_if.html" title="count_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">count_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">Pred</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">int</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/count_if.html" title="count_if"><tt class="computeroutput"><span class="identifier">count_if</span></tt></a>. The return type is
always <tt class="computeroutput"><span class="keyword">int</span></tt>.
</p>
<a name="fusion.algorithms.query.metafunctions.count_if.complexity"></a><h6>
<a name="id568072"></a>
<a href="count_if.html#fusion.algorithms.query.metafunctions.count_if.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.query.metafunctions.count_if.header"></a><h6>
<a name="id568103"></a>
<a href="count_if.html#fusion.algorithms.query.metafunctions.count_if.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">count_if</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="count.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../transformation.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>find</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.find"></a><a href="find.html" title="find">find</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.find.description"></a><h6>
<a name="id565788"></a>
<a href="find.html#fusion.algorithms.query.metafunctions.find.description">Description</a>
</h6>
<p>
Returns the result type of <tt class="computeroutput"><span class="identifier">find</span></tt>,
given the sequence and search types.
</p>
<a name="fusion.algorithms.query.metafunctions.find.synopsis"></a><h6>
<a name="id565830"></a>
<a href="find.html#fusion.algorithms.query.metafunctions.find.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">find</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id565948"></a><p class="title"><b>Table<EFBFBD>1.48.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>Model
of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.find.expression_semantics"></a><h6>
<a name="id566042"></a>
<a href="find.html#fusion.algorithms.query.metafunctions.find.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="find.html" title="find"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">find</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
category as the iterators of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
first element of type <tt class="computeroutput"><span class="identifier">T</span></tt>
in <tt class="computeroutput"><span class="identifier">Sequence</span></tt>, or <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/end.html" title="end"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">end</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span></tt> if there is no such element.
</p>
<a name="fusion.algorithms.query.metafunctions.find.complexity"></a><h6>
<a name="id566239"></a>
<a href="find.html#fusion.algorithms.query.metafunctions.find.complexity">Complexity</a>
</h6>
<p>
Linear, at most <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> comparisons.
</p>
<a name="fusion.algorithms.query.metafunctions.find.header"></a><h6>
<a name="id566321"></a>
<a href="find.html#fusion.algorithms.query.metafunctions.find.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">find</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="none.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="find_if.html"><img src="../../../../images/next.png" alt="Next"></a>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.find_if"></a><a href="find_if.html" title="find_if">find_if</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.find_if.description"></a><h6>
<a name="id566448"></a>
<a href="find_if.html#fusion.algorithms.query.metafunctions.find_if.description">Description</a>
</h6>
<p>
Returns the result type of <tt class="computeroutput"><span class="identifier">find_if</span></tt>
given the sequence and predicate types.
</p>
<a name="fusion.algorithms.query.metafunctions.find_if.synopsis"></a><h6>
<a name="id566491"></a>
<a href="find_if.html#fusion.algorithms.query.metafunctions.find_if.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Pred</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">find_if</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id566609"></a><p class="title"><b>Table<EFBFBD>1.49.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Pred</span></tt></td>
<td>A
model of MPL Lambda Expression</td>
<td>Operation's arguments</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.find_if.expression_semantics"></a><h6>
<a name="id566704"></a>
<a href="find_if.html#fusion.algorithms.query.metafunctions.find_if.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="find_if.html" title="find_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">find_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">Pred</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
category as the iterators of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
first element in <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
for which <tt class="computeroutput"><span class="identifier">Pred</span></tt> evaluates
to true. Returns <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/end.html" title="end"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">end</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span></tt> if there is no such element.
</p>
<a name="fusion.algorithms.query.metafunctions.find_if.complexity"></a><h6>
<a name="id566902"></a>
<a href="find_if.html#fusion.algorithms.query.metafunctions.find_if.complexity">Complexity</a>
</h6>
<p>
Linear. At most <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> comparisons.
</p>
<a name="fusion.algorithms.query.metafunctions.find_if.header"></a><h6>
<a name="id566986"></a>
<a href="find_if.html#fusion.algorithms.query.metafunctions.find_if.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">find_if</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="find.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="count.html"><img src="../../../../images/next.png" alt="Next"></a>
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<hr>
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<a accesskey="p" href="all.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="find.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.none"></a><a href="none.html" title="none">none</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.none.description"></a><h6>
<a name="id565178"></a>
<a href="none.html#fusion.algorithms.query.metafunctions.none.description">Description</a>
</h6>
<p>
A metafunction returning the result type of <a href="../functions/none.html" title="none"><tt class="computeroutput"><span class="identifier">none</span></tt></a>.
</p>
<a name="fusion.algorithms.query.metafunctions.none.synopsis"></a><h6>
<a name="id565227"></a>
<a href="none.html#fusion.algorithms.query.metafunctions.none.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">none</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">bool</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id565347"></a><p class="title"><b>Table<EFBFBD>1.47.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
model of unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.none.expression_semantics"></a><h6>
<a name="id565449"></a>
<a href="none.html#fusion.algorithms.query.metafunctions.none.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="none.html" title="none"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">none</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/none.html" title="none"><tt class="computeroutput"><span class="identifier">none</span></tt></a> given a sequence of type
<tt class="computeroutput"><span class="identifier">Sequence</span></tt> and a unary
<a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a> of type <tt class="computeroutput"><span class="identifier">F</span></tt>.
The return type is always <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<a name="fusion.algorithms.query.metafunctions.none.complexity"></a><h6>
<a name="id565630"></a>
<a href="none.html#fusion.algorithms.query.metafunctions.none.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.query.metafunctions.none.header"></a><h6>
<a name="id565661"></a>
<a href="none.html#fusion.algorithms.query.metafunctions.none.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">none</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
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<a accesskey="p" href="all.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="find.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Transformation</title>
<link rel="stylesheet" href="../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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<div class="section" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.algorithms.transformation"></a><a href="transformation.html" title="Transformation">Transformation</a></h3></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="transformation/functions.html">Functions</a></span></dt>
<dt><span class="section"><a href="transformation/metafunctions.html">Metafunctions</a></span></dt>
</dl></div>
<p>
The transformation algorithms create new sequences out of existing sequences
by performing some sort of transformation. In reality the new sequences are
views onto the data in the original sequences.
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td colspan="2" align="left" valign="top"><p>
As the transformation algorithms return views onto their input arguments,
it is important that the lifetime of the input arguments is greater than
the period during which you wish to use the results.
</p></td></tr>
</table></div>
<a name="fusion.algorithms.transformation.header"></a><h4>
<a name="id568251"></a>
<a href="transformation.html#fusion.algorithms.transformation.header">Header</a>
</h4>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
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<a accesskey="p" href="query/metafunctions/count_if.html"><img src="../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../algorithms.html"><img src="../../images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="transformation/functions.html"><img src="../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Functions</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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<a name="fusion.algorithms.transformation.functions"></a><a href="functions.html" title="Functions">Functions</a></h4></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="functions/filter.html">filter</a></span></dt>
<dt><span class="section"><a href="functions/filter_if.html">filter_if</a></span></dt>
<dt><span class="section"><a href="functions/transform.html">transform</a></span></dt>
<dt><span class="section"><a href="functions/replace.html">replace</a></span></dt>
<dt><span class="section"><a href="functions/replace_if.html">replace_if</a></span></dt>
<dt><span class="section"><a href="functions/remove.html">remove</a></span></dt>
<dt><span class="section"><a href="functions/remove_if.html">remove_if</a></span></dt>
<dt><span class="section"><a href="functions/reverse.html">reverse</a></span></dt>
<dt><span class="section"><a href="functions/clear.html">clear</a></span></dt>
<dt><span class="section"><a href="functions/erase.html">erase</a></span></dt>
<dt><span class="section"><a href="functions/erase_key.html">erase_key</a></span></dt>
<dt><span class="section"><a href="functions/insert.html">insert</a></span></dt>
<dt><span class="section"><a href="functions/insert_range.html">insert_range</a></span></dt>
<dt><span class="section"><a href="functions/join.html">join</a></span></dt>
<dt><span class="section"><a href="functions/zip.html">zip</a></span></dt>
<dt><span class="section"><a href="functions/pop_back.html">pop_back</a></span></dt>
<dt><span class="section"><a href="functions/pop_front.html">pop_front</a></span></dt>
<dt><span class="section"><a href="functions/push_back.html">push_back</a></span></dt>
<dt><span class="section"><a href="functions/push_front.html">push_front</a></span></dt>
</dl></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>clear</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.clear"></a><a href="clear.html" title="clear">clear</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.clear.description"></a><h6>
<a name="id576605"></a>
<a href="clear.html#fusion.algorithms.transformation.functions.clear.description">Description</a>
</h6>
<p>
<a href="clear.html" title="clear"><tt class="computeroutput"><span class="identifier">clear</span></tt></a> returns an empty sequence.
</p>
<a name="fusion.algorithms.transformation.functions.clear.synposis"></a><h6>
<a name="id576653"></a>
<a href="clear.html#fusion.algorithms.transformation.functions.clear.synposis">Synposis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/clear.html" title="clear"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">clear</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">clear</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id576809"></a><p class="title"><b>Table<EFBFBD>1.61.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.clear.expression_semantics"></a><h6>
<a name="id576885"></a>
<a href="clear.html#fusion.algorithms.transformation.functions.clear.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="clear.html" title="clear"><tt class="computeroutput"><span class="identifier">clear</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Expression Semantics</b></span>: Returns a sequence
with no elements.
</p>
<a name="fusion.algorithms.transformation.functions.clear.complexity"></a><h6>
<a name="id576981"></a>
<a href="clear.html#fusion.algorithms.transformation.functions.clear.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.functions.clear.header"></a><h6>
<a name="id577013"></a>
<a href="clear.html#fusion.algorithms.transformation.functions.clear.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">clear</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.clear.example"></a><h6>
<a name="id577118"></a>
<a href="clear.html#fusion.algorithms.transformation.functions.clear.example">Example</a>
</h6>
<pre class="programlisting">
<span class="identifier">assert</span><span class="special">(</span><a href="clear.html" title="clear"><tt class="computeroutput"><span class="identifier">clear</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">))</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">());</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.erase"></a><a href="erase.html" title="erase">erase</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.erase.description"></a><h6>
<a name="id577282"></a>
<a href="erase.html#fusion.algorithms.transformation.functions.erase.description">Description</a>
</h6>
<p>
Returns a new sequence, containing all the elements of the original except
those at a specified iterator, or between two iterators.
</p>
<a name="fusion.algorithms.transformation.functions.erase.synposis"></a><h6>
<a name="id577316"></a>
<a href="erase.html#fusion.algorithms.transformation.functions.erase.synposis">Synposis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">First</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/erase.html" title="erase"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">erase</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">First</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">erase</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">First</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">it1</span><span class="special">);</span>
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">First</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Last</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/erase.html" title="erase"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">erase</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">First</span><span class="special">,</span> <span class="identifier">Last</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">erase</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">First</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">it1</span><span class="special">,</span> <span class="identifier">Last</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">it2</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id577777"></a><p class="title"><b>Table<EFBFBD>1.62.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameters</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">it1</span></tt></td>
<td>A
model of <a href="../../../iterators/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Iterator into <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">it2</span></tt></td>
<td>A
model of <a href="../../../iterators/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Iterator into <tt class="computeroutput"><span class="identifier">seq</span></tt>
after <tt class="computeroutput"><span class="identifier">it1</span></tt>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.erase.expression_semantics"></a><h6>
<a name="id577935"></a>
<a href="erase.html#fusion.algorithms.transformation.functions.erase.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="erase.html" title="erase"><tt class="computeroutput"><span class="identifier">erase</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">pos</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence, containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>
except the element at <tt class="computeroutput"><span class="identifier">pos</span></tt>.
</p>
<pre class="programlisting">
<a href="erase.html" title="erase"><tt class="computeroutput"><span class="identifier">erase</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence, with
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>,
in their original order, except those in the range [<tt class="computeroutput"><span class="identifier">first</span></tt>,<tt class="computeroutput"><span class="identifier">last</span></tt>).
</p>
<a name="fusion.algorithms.transformation.functions.erase.complexity"></a><h6>
<a name="id578185"></a>
<a href="erase.html#fusion.algorithms.transformation.functions.erase.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.erase.header"></a><h6>
<a name="id578216"></a>
<a href="erase.html#fusion.algorithms.transformation.functions.erase.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">erase</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.erase.example"></a><h6>
<a name="id578322"></a>
<a href="erase.html#fusion.algorithms.transformation.functions.erase.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">double</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="number">2.0</span><span class="special">,</span> <span class="char">'c'</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="erase.html" title="erase"><tt class="computeroutput"><span class="identifier">erase</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span> <a href="../../../iterators/functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">)))</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="char">'c'</span><span class="special">));</span>
<span class="identifier">assert</span><span class="special">(</span><a href="erase.html" title="erase"><tt class="computeroutput"><span class="identifier">erase</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span> <a href="../../../iterators/functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">)),</span> <a href="../../../sequences/intrinsics/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">))</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="clear.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="erase_key.html"><img src="../../../../images/next.png" alt="Next"></a>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>erase_key</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.erase_key"></a><a href="erase_key.html" title="erase_key">erase_key</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.erase_key.description"></a><h6>
<a name="id578780"></a>
<a href="erase_key.html#fusion.algorithms.transformation.functions.erase_key.description">Description</a>
</h6>
<p>
For an <a href="../../../sequences/concepts/associative_sequence.html" title="Associative
Sequence">Associative
Sequence</a><EFBFBD><tt class="computeroutput"><span class="identifier">seq</span></tt>,
returns a <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a> containing all the elements of the original except those
with a given key.
</p>
<a name="fusion.algorithms.transformation.functions.erase_key.synposis"></a><h6>
<a name="id578841"></a>
<a href="erase_key.html#fusion.algorithms.transformation.functions.erase_key.synposis">Synposis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <span class="identifier">result_of</span><span class="special">::</span><span class="identifier">erase_key</span><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">erase_key</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id579013"></a><p class="title"><b>Table<EFBFBD>1.63.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/associative_sequence.html" title="Associative
Sequence">Associative
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Key</span></tt></td>
<td>Any
type</td>
<td>Key to erase</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.erase_key.expression_semantics"></a><h6>
<a name="id579109"></a>
<a href="erase_key.html#fusion.algorithms.transformation.functions.erase_key.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="erase_key.html" title="erase_key"><tt class="computeroutput"><span class="identifier">erase_key</span></tt></a><span class="special">&lt;</span><span class="identifier">Key</span><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence, containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>,
except those with key <tt class="computeroutput"><span class="identifier">Key</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.erase_key.complexity"></a><h6>
<a name="id579236"></a>
<a href="erase_key.html#fusion.algorithms.transformation.functions.erase_key.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.erase_key.header"></a><h6>
<a name="id579267"></a>
<a href="erase_key.html#fusion.algorithms.transformation.functions.erase_key.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">erase_key</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.erase_key.example"></a><h6>
<a name="id579373"></a>
<a href="erase_key.html#fusion.algorithms.transformation.functions.erase_key.example">Example</a>
</h6>
<pre class="programlisting">
<span class="identifier">assert</span><span class="special">(</span><a href="erase_key.html" title="erase_key"><tt class="computeroutput"><span class="identifier">erase_key</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;(</span><a href="../../../sequences/generation/functions/make_map.html" title="make_map"><tt class="computeroutput"><span class="identifier">make_map</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">long</span><span class="special">&gt;(</span><span class="char">'a'</span><span class="special">,</span> <span class="char">'b'</span><span class="special">))</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_map.html" title="make_map"><tt class="computeroutput"><span class="identifier">make_map</span></tt></a><span class="special">&lt;</span><span class="keyword">long</span><span class="special">&gt;(</span><span class="char">'b'</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="erase.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="insert.html"><img src="../../../../images/next.png" alt="Next"></a>
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>filter</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.filter"></a><a href="filter.html" title="filter">filter</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.filter.description"></a><h6>
<a name="id568389"></a>
<a href="filter.html#fusion.algorithms.transformation.functions.filter.description">Description</a>
</h6>
<p>
For a given sequence, filter returns a new sequences containing only
the elements of a specified type.
</p>
<a name="fusion.algorithms.transformation.functions.filter.synopsis"></a><h6>
<a name="id568422"></a>
<a href="filter.html#fusion.algorithms.transformation.functions.filter.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/filter.html" title="filter"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">filter</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">filter</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id568606"></a><p class="title"><b>Table<EFBFBD>1.52.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>The type to retain</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.filter.expression_semantics"></a><h6>
<a name="id568700"></a>
<a href="filter.html#fusion.algorithms.transformation.functions.filter.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="filter.html" title="filter"><tt class="computeroutput"><span class="identifier">filter</span></tt></a><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>
of type <tt class="computeroutput"><span class="identifier">T</span></tt>. Equivalent
to <tt class="computeroutput"><a href="filter_if.html" title="filter_if"><tt class="computeroutput"><span class="identifier">filter_if</span></tt></a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">same_type</span><span class="special">&lt;</span><span class="identifier">_</span><span class="special">,</span><EFBFBD><span class="identifier">T</span><span class="special">&gt;</span><EFBFBD><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">)</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.filter.complexity"></a><h6>
<a name="id568910"></a>
<a href="filter.html#fusion.algorithms.transformation.functions.filter.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.filter.header"></a><h6>
<a name="id568942"></a>
<a href="filter.html#fusion.algorithms.transformation.functions.filter.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">filter</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.filter.example"></a><h6>
<a name="id569048"></a>
<a href="filter.html#fusion.algorithms.transformation.functions.filter.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">long</span><span class="special">,</span><span class="keyword">long</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">,</span><span class="number">4</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="filter.html" title="filter"><tt class="computeroutput"><span class="identifier">filter</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;(</span><span class="identifier">vec</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
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<title>filter_if</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.filter_if"></a><a href="filter_if.html" title="filter_if">filter_if</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.filter_if.description"></a><h6>
<a name="id569318"></a>
<a href="filter_if.html#fusion.algorithms.transformation.functions.filter_if.description">Description</a>
</h6>
<p>
For a given sequence, <a href="filter_if.html" title="filter_if"><tt class="computeroutput"><span class="identifier">filter_if</span></tt></a> returns a new sequences
containing only the elements with types for which a given MPL Lambda
Expression evaluates to <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.filter_if.synopsis"></a><h6>
<a name="id569398"></a>
<a href="filter_if.html#fusion.algorithms.transformation.functions.filter_if.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Pred</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/filter_if.html" title="filter_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">filter_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">Pred</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">filter_if</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id569584"></a><p class="title"><b>Table<EFBFBD>1.53.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Pred</span></tt></td>
<td>A
unary MPL Lambda Expression</td>
<td>The predicate to filter
by</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.filter_if.expression_semantics"></a><h6>
<a name="id569681"></a>
<a href="filter_if.html#fusion.algorithms.transformation.functions.filter_if.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="filter_if.html" title="filter_if"><tt class="computeroutput"><span class="identifier">filter_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Pred</span><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>
with types for which <tt class="computeroutput"><span class="identifier">Pred</span></tt>
evaluates to <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>. The order of the retained elements
is the same as in the original sequence.
</p>
<a name="fusion.algorithms.transformation.functions.filter_if.complexity"></a><h6>
<a name="id569840"></a>
<a href="filter_if.html#fusion.algorithms.transformation.functions.filter_if.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.filter_if.header"></a><h6>
<a name="id569871"></a>
<a href="filter_if.html#fusion.algorithms.transformation.functions.filter_if.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">filter_if</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.filter_if.example"></a><h6>
<a name="id569978"></a>
<a href="filter_if.html#fusion.algorithms.transformation.functions.filter_if.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">double</span><span class="special">,</span><span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3.0</span><span class="special">,</span><span class="number">4.0</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="filter_if.html" title="filter_if"><tt class="computeroutput"><span class="identifier">filter_if</span></tt></a><span class="special">&lt;</span><span class="identifier">is_integral</span><span class="special">&lt;</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">_</span><span class="special">&gt;</span> <span class="special">&gt;(</span><span class="identifier">vec</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="filter.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="transform.html"><img src="../../../../images/next.png" alt="Next"></a>
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<title>insert</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.insert"></a><a href="insert.html" title="insert">insert</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.insert.description"></a><h6>
<a name="id579579"></a>
<a href="insert.html#fusion.algorithms.transformation.functions.insert.description">Description</a>
</h6>
<p>
Returns a new sequence with all the elements of the original, an a new
element inserted the position described by a given iterator.
</p>
<a name="fusion.algorithms.transformation.functions.insert.synposis"></a><h6>
<a name="id579613"></a>
<a href="insert.html#fusion.algorithms.transformation.functions.insert.synposis">Synposis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Pos</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="emphasis"><em>unspecified</em></span> <span class="identifier">insert</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">Pos</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">pos</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id579802"></a><p class="title"><b>Table<EFBFBD>1.64.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">pos</span></tt></td>
<td>A
model of <a href="../../../iterators/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>The position to insert at</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">t</span></tt></td>
<td>Any
type</td>
<td>The value to insert</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.insert.expression_semantics"></a><h6>
<a name="id579927"></a>
<a href="insert.html#fusion.algorithms.transformation.functions.insert.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="insert.html" title="insert"><tt class="computeroutput"><span class="identifier">insert</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence, containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>,
in their original order, and a new element with the type and value of
<tt class="computeroutput"><span class="identifier">t</span></tt> inserted at iterator
<tt class="computeroutput"><span class="identifier">pos</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.insert.complexity"></a><h6>
<a name="id580076"></a>
<a href="insert.html#fusion.algorithms.transformation.functions.insert.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.insert.header"></a><h6>
<a name="id580108"></a>
<a href="insert.html#fusion.algorithms.transformation.functions.insert.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">insert</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.insert.example"></a><h6>
<a name="id580214"></a>
<a href="insert.html#fusion.algorithms.transformation.functions.insert.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="insert.html" title="insert"><tt class="computeroutput"><span class="identifier">insert</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span> <a href="../../../iterators/functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">)),</span> <span class="number">3</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">3</span><span class="special">,</span><span class="number">2</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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<div class="spirit-nav">
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.insert_range"></a><a href="insert_range.html" title="insert_range">insert_range</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.insert_range.description"></a><h6>
<a name="id580508"></a>
<a href="insert_range.html#fusion.algorithms.transformation.functions.insert_range.description">Description</a>
</h6>
<p>
Returns a new sequence with another sequence inserted at a specified
iterator.
</p>
<a name="fusion.algorithms.transformation.functions.insert_range.synposis"></a><h6>
<a name="id580542"></a>
<a href="insert_range.html#fusion.algorithms.transformation.functions.insert_range.synposis">Synposis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Pos</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Range</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/insert_range.html" title="insert_range"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">insert_range</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">Pos</span><span class="special">,</span> <span class="identifier">Range</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">insert_range</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">Pos</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">pos</span><span class="special">,</span> <span class="identifier">Range</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">range</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id580815"></a><p class="title"><b>Table<EFBFBD>1.65.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">pos</span></tt></td>
<td>A
model of <a href="../../../iterators/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>The position to insert at</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">range</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Range to insert</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.insert_range.expression_semantics"></a><h6>
<a name="id580947"></a>
<a href="insert_range.html#fusion.algorithms.transformation.functions.insert_range.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="insert.html" title="insert"><tt class="computeroutput"><span class="identifier">insert</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">pos</span><span class="special">,</span> <span class="identifier">range</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence, containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>,
and the elements of <tt class="computeroutput"><span class="identifier">range</span></tt>
inserted at iterator <tt class="computeroutput"><span class="identifier">pos</span></tt>.
All elements retaining their ordering from the orignal sequences.
</p>
<a name="fusion.algorithms.transformation.functions.insert_range.complexity"></a><h6>
<a name="id581099"></a>
<a href="insert_range.html#fusion.algorithms.transformation.functions.insert_range.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.insert_range.header"></a><h6>
<a name="id581130"></a>
<a href="insert_range.html#fusion.algorithms.transformation.functions.insert_range.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">insert_range</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.insert_range.example"></a><h6>
<a name="id581237"></a>
<a href="insert_range.html#fusion.algorithms.transformation.functions.insert_range.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="insert_range.html" title="insert_range"><tt class="computeroutput"><span class="identifier">insert_range</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span> <a href="../../../iterators/functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">)),</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">3</span><span class="special">,</span><span class="number">4</span><span class="special">))</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">3</span><span class="special">,</span><span class="number">4</span><span class="special">,</span><span class="number">2</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="insert.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="join.html"><img src="../../../../images/next.png" alt="Next"></a>
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@ -1,133 +0,0 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>join</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.join"></a><a href="join.html" title="join">join</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.join.description"></a><h6>
<a name="id581567"></a>
<a href="join.html#fusion.algorithms.transformation.functions.join.description">Description</a>
</h6>
<p>
Takes 2 sequences and returns a sequence containing the elements of the
first followed by the elements of the second.
</p>
<a name="fusion.algorithms.transformation.functions.join.synopsis"></a><h6>
<a name="id581601"></a>
<a href="join.html#fusion.algorithms.transformation.functions.join.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">LhSequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">RhSequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/join.html" title="join"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">join</span></tt></a><span class="special">&lt;</span><span class="identifier">LhSequence</span><span class="special">,</span> <span class="identifier">RhSequence</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">join</span><span class="special">(</span><span class="identifier">LhSequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">lhs</span><span class="special">,</span> <span class="identifier">RhSequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id581808"></a><p class="title"><b>Table<EFBFBD>1.66.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">lhs</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">rhs</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.join.expression_semantics"></a><h6>
<a name="id581909"></a>
<a href="join.html#fusion.algorithms.transformation.functions.join.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="join.html" title="join"><tt class="computeroutput"><span class="identifier">join</span></tt></a><span class="special">(</span><span class="identifier">lhs</span><span class="special">,</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence containing
all the elements of <tt class="computeroutput"><span class="identifier">lhs</span></tt>
followed by all the elements of <tt class="computeroutput"><span class="identifier">rhs</span></tt>.
The order of th elements is preserved.
</p>
<a name="fusion.algorithms.transformation.functions.join.complexity"></a><h6>
<a name="id582037"></a>
<a href="join.html#fusion.algorithms.transformation.functions.join.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.join.header"></a><h6>
<a name="id582068"></a>
<a href="join.html#fusion.algorithms.transformation.functions.join.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">join</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.join.example"></a><h6>
<a name="id582174"></a>
<a href="join.html#fusion.algorithms.transformation.functions.join.example">Example</a>
</h6>
<pre class="programlisting">
<a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">v1</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="char">'a'</span><span class="special">);</span>
<a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">v2</span><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="char">'b'</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="join.html" title="join"><tt class="computeroutput"><span class="identifier">join</span></tt></a><span class="special">(</span><span class="identifier">v1</span><span class="special">,</span> <span class="identifier">v2</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="char">'a'</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="char">'b'</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="insert_range.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="zip.html"><img src="../../../../images/next.png" alt="Next"></a>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>pop_back</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.pop_back"></a><a href="pop_back.html" title="pop_back">pop_back</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.pop_back.description"></a><h6>
<a name="id583692"></a>
<a href="pop_back.html#fusion.algorithms.transformation.functions.pop_back.description">Description</a>
</h6>
<p>
Returns a new sequence, with the last element of the original removed.
</p>
<a name="fusion.algorithms.transformation.functions.pop_back.synopsis"></a><h6>
<a name="id583724"></a>
<a href="pop_back.html#fusion.algorithms.transformation.functions.pop_back.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/pop_back.html" title="pop_back"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">pop_back</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">pop_back</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id583880"></a><p class="title"><b>Table<EFBFBD>1.68.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.pop_back.expression_semantics"></a><h6>
<a name="id583956"></a>
<a href="pop_back.html#fusion.algorithms.transformation.functions.pop_back.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="pop_back.html" title="pop_back"><tt class="computeroutput"><span class="identifier">pop_back</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>,
except the last element. The elements in the new sequence are in the
same order as they were in <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.pop_back.complexity"></a><h6>
<a name="id584073"></a>
<a href="pop_back.html#fusion.algorithms.transformation.functions.pop_back.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.pop_back.header"></a><h6>
<a name="id584104"></a>
<a href="pop_back.html#fusion.algorithms.transformation.functions.pop_back.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">pop_back</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.pop_back.example"></a><h6>
<a name="id584210"></a>
<a href="pop_back.html#fusion.algorithms.transformation.functions.pop_back.example">Example</a>
</h6>
<pre class="programlisting">
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">___pop_back__</span><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">))</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.pop_front"></a><a href="pop_front.html" title="pop_front">pop_front</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.pop_front.description"></a><h6>
<a name="id584385"></a>
<a href="pop_front.html#fusion.algorithms.transformation.functions.pop_front.description">Description</a>
</h6>
<p>
Returns a new sequence, with the first element of the original removed.
</p>
<a name="fusion.algorithms.transformation.functions.pop_front.synopsis"></a><h6>
<a name="id584418"></a>
<a href="pop_front.html#fusion.algorithms.transformation.functions.pop_front.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/pop_front.html" title="pop_front"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">pop_front</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">pop_front</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id584575"></a><p class="title"><b>Table<EFBFBD>1.69.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.pop_front.expression_semantics"></a><h6>
<a name="id584651"></a>
<a href="pop_front.html#fusion.algorithms.transformation.functions.pop_front.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="pop_front.html" title="pop_front"><tt class="computeroutput"><span class="identifier">pop_front</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>,
except the first element. The elements in the new sequence are in the
same order as they were in <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.pop_front.complexity"></a><h6>
<a name="id584769"></a>
<a href="pop_front.html#fusion.algorithms.transformation.functions.pop_front.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.pop_front.header"></a><h6>
<a name="id584799"></a>
<a href="pop_front.html#fusion.algorithms.transformation.functions.pop_front.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">pop_front</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.pop_front.example"></a><h6>
<a name="id584906"></a>
<a href="pop_front.html#fusion.algorithms.transformation.functions.pop_front.example">Example</a>
</h6>
<pre class="programlisting">
<span class="identifier">assert</span><span class="special">(</span><a href="pop_front.html" title="pop_front"><tt class="computeroutput"><span class="identifier">pop_front</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">))</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="pop_back.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="push_back.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>push_back</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.push_back"></a><a href="push_back.html" title="push_back">push_back</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.push_back.description"></a><h6>
<a name="id585088"></a>
<a href="push_back.html#fusion.algorithms.transformation.functions.push_back.description">Description</a>
</h6>
<p>
Returns a new sequence with an element added at the end.
</p>
<a name="fusion.algorithms.transformation.functions.push_back.synopsis"></a><h6>
<a name="id585121"></a>
<a href="push_back.html#fusion.algorithms.transformation.functions.push_back.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">push_back</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">push_back</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id585329"></a><p class="title"><b>Table<EFBFBD>1.70.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">t</span></tt></td>
<td>Any
type</td>
<td>The value to add to the end</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.push_back.expression_semantics"></a><h6>
<a name="id585426"></a>
<a href="push_back.html#fusion.algorithms.transformation.functions.push_back.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">push_back</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence, containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>,
and new element <tt class="computeroutput"><span class="identifier">t</span></tt> appended
to the end. The elements are in the same order as they were in <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.push_back.complexity"></a><h6>
<a name="id585564"></a>
<a href="push_back.html#fusion.algorithms.transformation.functions.push_back.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.push_back.header"></a><h6>
<a name="id585595"></a>
<a href="push_back.html#fusion.algorithms.transformation.functions.push_back.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">push_back</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.push_back.example"></a><h6>
<a name="id585701"></a>
<a href="push_back.html#fusion.algorithms.transformation.functions.push_back.example">Example</a>
</h6>
<pre class="programlisting">
<span class="identifier">assert</span><span class="special">(</span><a href="push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">push_back</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">),</span><span class="number">4</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">,</span><span class="number">4</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="pop_front.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="push_front.html"><img src="../../../../images/next.png" alt="Next"></a>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.push_front"></a><a href="push_front.html" title="push_front">push_front</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.push_front.description"></a><h6>
<a name="id585915"></a>
<a href="push_front.html#fusion.algorithms.transformation.functions.push_front.description">Description</a>
</h6>
<p>
Returns a new sequence with an element added at the beginning.
</p>
<a name="fusion.algorithms.transformation.functions.push_front.synopsis"></a><h6>
<a name="id585948"></a>
<a href="push_front.html#fusion.algorithms.transformation.functions.push_front.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/push_front.html" title="push_front"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">push_front</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">push_front</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id586156"></a><p class="title"><b>Table<EFBFBD>1.71.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">t</span></tt></td>
<td>Any
type</td>
<td>The value to add to the beginning</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.push_front.expression_semantics"></a><h6>
<a name="id586252"></a>
<a href="push_front.html#fusion.algorithms.transformation.functions.push_front.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">push_back</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence, containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>,
and new element <tt class="computeroutput"><span class="identifier">t</span></tt> appended
to the beginning. The elements are in the same order as they were in
<tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.push_front.complexity"></a><h6>
<a name="id586393"></a>
<a href="push_front.html#fusion.algorithms.transformation.functions.push_front.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.push_front.header"></a><h6>
<a name="id586424"></a>
<a href="push_front.html#fusion.algorithms.transformation.functions.push_front.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">push_front</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.push_front.example"></a><h6>
<a name="id586531"></a>
<a href="push_front.html#fusion.algorithms.transformation.functions.push_front.example">Example</a>
</h6>
<pre class="programlisting">
<span class="identifier">assert</span><span class="special">(</span><a href="push_front.html" title="push_front"><tt class="computeroutput"><span class="identifier">push_front</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">),</span><span class="number">0</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">0</span><span class="special">,</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.remove"></a><a href="remove.html" title="remove">remove</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.remove.description"></a><h6>
<a name="id574071"></a>
<a href="remove.html#fusion.algorithms.transformation.functions.remove.description">Description</a>
</h6>
<p>
Returns a new sequence, with all the elements of the original sequence,
except those of a given type.
</p>
<a name="fusion.algorithms.transformation.functions.remove.synopsis"></a><h6>
<a name="id574104"></a>
<a href="remove.html#fusion.algorithms.transformation.functions.remove.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/remove.html" title="remove"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">remove</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">replace</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id574288"></a><p class="title"><b>Table<EFBFBD>1.58.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>Type to remove</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.remove.expression_semantics"></a><h6>
<a name="id574383"></a>
<a href="remove.html#fusion.algorithms.transformation.functions.remove.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="remove.html" title="remove"><tt class="computeroutput"><span class="identifier">remove</span></tt></a><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence, containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>,
in their original order, except those of type <tt class="computeroutput"><span class="identifier">T</span></tt>.
Equivalent to <tt class="computeroutput"><a href="remove_if.html" title="remove_if"><tt class="computeroutput"><span class="identifier">remove_if</span></tt></a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><span class="identifier">_</span><span class="special">,</span><span class="identifier">T</span><span class="special">&gt;</span><EFBFBD><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">)</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.remove.complexity"></a><h6>
<a name="id574593"></a>
<a href="remove.html#fusion.algorithms.transformation.functions.remove.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.remove.header"></a><h6>
<a name="id574626"></a>
<a href="remove.html#fusion.algorithms.transformation.functions.remove.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">remove</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.remove.example"></a><h6>
<a name="id574732"></a>
<a href="remove.html#fusion.algorithms.transformation.functions.remove.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2.0</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="remove.html" title="remove"><tt class="computeroutput"><span class="identifier">remove</span></tt></a><span class="special">&lt;</span><span class="keyword">double</span><span class="special">&gt;(</span><span class="identifier">vec</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="replace_if.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="remove_if.html"><img src="../../../../images/next.png" alt="Next"></a>
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@ -1,130 +0,0 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>remove_if</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.remove_if"></a><a href="remove_if.html" title="remove_if">remove_if</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.remove_if.description"></a><h6>
<a name="id574953"></a>
<a href="remove_if.html#fusion.algorithms.transformation.functions.remove_if.description">Description</a>
</h6>
<p>
Returns a new sequence, containing all the elements of the original except
those where a given unary function object evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.remove_if.synopsis"></a><h6>
<a name="id574997"></a>
<a href="remove_if.html#fusion.algorithms.transformation.functions.remove_if.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Pred</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/remove_if.html" title="remove_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">remove_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">Pred</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">remove_if</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id575182"></a><p class="title"><b>Table<EFBFBD>1.59.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Pred</span></tt></td>
<td>A
model of unary MPL Lambda Expression</td>
<td>Removal predicate</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.remove_if.expression_semantics"></a><h6>
<a name="id575278"></a>
<a href="remove_if.html#fusion.algorithms.transformation.functions.remove_if.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="remove_if.html" title="remove_if"><tt class="computeroutput"><span class="identifier">remove_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Pred</span><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence, containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>,
in their original order, except those elements with types for which
<tt class="computeroutput"><span class="identifier">Pred</span></tt> evaluates to <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>. Equivalent to <tt class="computeroutput"><a href="filter.html" title="filter"><tt class="computeroutput"><span class="identifier">filter</span></tt></a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">not_</span><span class="special">&lt;</span><span class="identifier">Pred</span><span class="special">&gt;</span><EFBFBD><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">)</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.remove_if.complexity"></a><h6>
<a name="id575519"></a>
<a href="remove_if.html#fusion.algorithms.transformation.functions.remove_if.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.remove_if.header"></a><h6>
<a name="id575550"></a>
<a href="remove_if.html#fusion.algorithms.transformation.functions.remove_if.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">remove_if</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.remove_if.example"></a><h6>
<a name="id575656"></a>
<a href="remove_if.html#fusion.algorithms.transformation.functions.remove_if.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">const</span> <a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2.0</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="remove_if.html" title="remove_if"><tt class="computeroutput"><span class="identifier">remove_if</span></tt></a><span class="special">&lt;</span><span class="identifier">is_floating_point</span><span class="special">&lt;</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">_</span><span class="special">&gt;</span> <span class="special">&gt;(</span><span class="identifier">vec</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="remove.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="reverse.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>replace</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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<table cellpadding="2" width="100%">
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.replace"></a><a href="replace.html" title="replace">replace</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.replace.description"></a><h6>
<a name="id572018"></a>
<a href="replace.html#fusion.algorithms.transformation.functions.replace.description">Description</a>
</h6>
<p>
Replaces each value within a sequence of a given type and value with
a new value.
</p>
<a name="fusion.algorithms.transformation.functions.replace.synopsis"></a><h6>
<a name="id572051"></a>
<a href="replace.html#fusion.algorithms.transformation.functions.replace.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/replace.html" title="replace"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">replace</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">replace</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">old_value</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">new_value</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id572294"></a><p class="title"><b>Table<EFBFBD>1.56.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, <tt class="computeroutput"><span class="identifier">e</span><EFBFBD><span class="special">==</span><EFBFBD><span class="identifier">old_value</span></tt>
is a valid expression, convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>,
for each element <tt class="computeroutput"><span class="identifier">e</span></tt>
in <tt class="computeroutput"><span class="identifier">seq</span></tt> with type
convertible to <tt class="computeroutput"><span class="identifier">T</span></tt>
</td>
<td>Operation's
argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">old_value</span></tt></td>
<td>Any
type</td>
<td>Value to replace</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">new_value</span></tt></td>
<td>Any
type</td>
<td>Replacement value</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.replace.expression_semantics"></a><h6>
<a name="id572476"></a>
<a href="replace.html#fusion.algorithms.transformation.functions.replace.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="replace.html" title="replace"><tt class="computeroutput"><span class="identifier">replace</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">old_value</span><span class="special">,</span> <span class="identifier">new_value</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence with
all the values of <tt class="computeroutput"><span class="identifier">seq</span></tt>
with <tt class="computeroutput"><span class="identifier">new_value</span></tt> assigned
to elements with the same type and equal to <tt class="computeroutput"><span class="identifier">old_value</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.replace.complexity"></a><h6>
<a name="id572627"></a>
<a href="replace.html#fusion.algorithms.transformation.functions.replace.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.replace.header"></a><h6>
<a name="id572659"></a>
<a href="replace.html#fusion.algorithms.transformation.functions.replace.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">replace</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.replace.example"></a><h6>
<a name="id572766"></a>
<a href="replace.html#fusion.algorithms.transformation.functions.replace.example">Example</a>
</h6>
<pre class="programlisting">
<span class="identifier">assert</span><span class="special">(</span><a href="replace.html" title="replace"><tt class="computeroutput"><span class="identifier">replace</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">),</span> <span class="number">2</span><span class="special">,</span> <span class="number">3</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">3</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>replace_if</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.replace_if"></a><a href="replace_if.html" title="replace_if">replace_if</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.replace_if.description"></a><h6>
<a name="id572962"></a>
<a href="replace_if.html#fusion.algorithms.transformation.functions.replace_if.description">Description</a>
</h6>
<p>
Replaces each element of a given sequence for which an unary function
object evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt>
replaced with a new value.
</p>
<a name="fusion.algorithms.transformation.functions.replace_if.synopsis"></a><h6>
<a name="id573005"></a>
<a href="replace_if.html#fusion.algorithms.transformation.functions.replace_if.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/replace_if.html" title="replace_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">replace_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">F</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">replace_if</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">F</span> <span class="identifier">f</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">new_value</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id573264"></a><p class="title"><b>Table<EFBFBD>1.57.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
function object for which <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> is a valid expression, convertible
to <tt class="computeroutput"><span class="keyword">bool</span></tt>, for each element
<tt class="computeroutput"><span class="identifier">e</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">new_value</span></tt></td>
<td>Any
type</td>
<td>Replacement value</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.replace_if.expression_semantics"></a><h6>
<a name="id573436"></a>
<a href="replace_if.html#fusion.algorithms.transformation.functions.replace_if.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="replace_if.html" title="replace_if"><tt class="computeroutput"><span class="identifier">replace_if</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">f</span><span class="special">,</span> <span class="identifier">new_value</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence with
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>,
with <tt class="computeroutput"><span class="identifier">new_value</span></tt> assigned
to each element for which <tt class="computeroutput"><span class="identifier">f</span></tt>
evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.replace_if.complexity"></a><h6>
<a name="id573598"></a>
<a href="replace_if.html#fusion.algorithms.transformation.functions.replace_if.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.replace_if.header"></a><h6>
<a name="id573629"></a>
<a href="replace_if.html#fusion.algorithms.transformation.functions.replace_if.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">replace_if</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.replace_if.example"></a><h6>
<a name="id573736"></a>
<a href="replace_if.html#fusion.algorithms.transformation.functions.replace_if.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">struct</span> <span class="identifier">odd</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">t</span> <span class="special">%</span> <span class="number">2</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">...</span>
<span class="identifier">assert</span><span class="special">(</span><a href="replace_if.html" title="replace_if"><tt class="computeroutput"><span class="identifier">replace_if</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">),</span> <span class="identifier">odd</span><span class="special">(),</span> <span class="number">3</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">3</span><span class="special">,</span><span class="number">2</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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<a accesskey="p" href="replace.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="remove.html"><img src="../../../../images/next.png" alt="Next"></a>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.reverse"></a><a href="reverse.html" title="reverse">reverse</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.reverse.description"></a><h6>
<a name="id575905"></a>
<a href="reverse.html#fusion.algorithms.transformation.functions.reverse.description">Description</a>
</h6>
<p>
Returns a new sequence with the elements of the original in reverse order.
</p>
<a name="fusion.algorithms.transformation.functions.reverse.synposis"></a><h6>
<a name="id575938"></a>
<a href="reverse.html#fusion.algorithms.transformation.functions.reverse.synposis">Synposis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/reverse.html" title="reverse"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">reverse</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">reverse</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id576094"></a><p class="title"><b>Table<EFBFBD>1.60.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>
</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.reverse.expression_semantics"></a><h6>
<a name="id576169"></a>
<a href="reverse.html#fusion.algorithms.transformation.functions.reverse.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="reverse.html" title="reverse"><tt class="computeroutput"><span class="identifier">reverse</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence containing
all the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>
in reverse order.
</p>
<a name="fusion.algorithms.transformation.functions.reverse.complexity"></a><h6>
<a name="id576275"></a>
<a href="reverse.html#fusion.algorithms.transformation.functions.reverse.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.reverse.header"></a><h6>
<a name="id576307"></a>
<a href="reverse.html#fusion.algorithms.transformation.functions.reverse.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">reverse</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.reverse.example"></a><h6>
<a name="id576413"></a>
<a href="reverse.html#fusion.algorithms.transformation.functions.reverse.example">Example</a>
</h6>
<pre class="programlisting">
<span class="identifier">assert</span><span class="special">(</span><a href="reverse.html" title="reverse"><tt class="computeroutput"><span class="identifier">reverse</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">))</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">3</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">1</span><span class="special">));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.transform"></a><a href="transform.html" title="transform">transform</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.transform.description"></a><h6>
<a name="id570274"></a>
<a href="transform.html#fusion.algorithms.transformation.functions.transform.description">Description</a>
</h6>
<p>
For a sequence <tt class="computeroutput"><span class="identifier">seq</span></tt> and
<a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a><EFBFBD><tt class="computeroutput"><span class="identifier">F</span></tt>,
<tt class="computeroutput"><span class="identifier">transform</span></tt> returns a new
sequence with elements created by applying <tt class="computeroutput"><span class="identifier">F</span></tt>
to each element of <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.transform.unary_version_synopsis"></a><h6>
<a name="id570368"></a>
<a href="transform.html#fusion.algorithms.transformation.functions.transform.unary_version_synopsis">Unary
version synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/transform.html" title="transform"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">transform</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">transform</span><span class="special">(</span>
<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">F</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id570572"></a><p class="title"><b>Table<EFBFBD>1.54.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
model of unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a> where <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> is a valid expression for each element
<tt class="computeroutput"><span class="identifier">e</span></tt> of <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>Transformation
function</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.transform.expression_semantics"></a><h6>
<a name="id570722"></a>
<a href="transform.html#fusion.algorithms.transformation.functions.transform.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="transform.html" title="transform"><tt class="computeroutput"><span class="identifier">transform</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence, containing
the return values of <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> for each element <tt class="computeroutput"><span class="identifier">e</span></tt>
within <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.transformation.functions.transform.binary_version_synopsis"></a><h6>
<a name="id570876"></a>
<a href="transform.html#fusion.algorithms.transformation.functions.transform.binary_version_synopsis">Binary
version synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence1</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Sequence2</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/transform.html" title="transform"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">transform</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence1</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">Sequence2</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">transform</span><span class="special">(</span>
<span class="identifier">Sequence1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq1</span><span class="special">,</span> <span class="identifier">Sequence2</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq2</span><span class="special">,</span> <span class="identifier">F</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id571142"></a><p class="title"><b>Table<EFBFBD>1.55.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq1</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">seq2</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
model of binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a> where <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><EFBFBD><span class="identifier">e2</span><span class="special">)</span></tt> is a valid expression for each pair
of elements <tt class="computeroutput"><span class="identifier">e1</span></tt> and
<tt class="computeroutput"><span class="identifier">e2</span></tt> of <tt class="computeroutput"><span class="identifier">seq1</span></tt> and <tt class="computeroutput"><span class="identifier">seq2</span></tt>
respectively</td>
<td>Transformation function</td>
</tr>
</tbody>
</table>
</div>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence, containing
the return values of <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><EFBFBD><span class="identifier">e2</span><span class="special">)</span></tt> for each pair of elements <tt class="computeroutput"><span class="identifier">e1</span></tt> and <tt class="computeroutput"><span class="identifier">e2</span></tt>
within <tt class="computeroutput"><span class="identifier">seq1</span></tt> and <tt class="computeroutput"><span class="identifier">seq2</span></tt> respectively.
</p>
<a name="fusion.algorithms.transformation.functions.transform.complexity"></a><h6>
<a name="id571462"></a>
<a href="transform.html#fusion.algorithms.transformation.functions.transform.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.transform.header"></a><h6>
<a name="id571493"></a>
<a href="transform.html#fusion.algorithms.transformation.functions.transform.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">transform</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.transform.example"></a><h6>
<a name="id571600"></a>
<a href="transform.html#fusion.algorithms.transformation.functions.transform.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">struct</span> <span class="identifier">triple</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">T</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="identifier">T</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">t</span> <span class="special">*</span> <span class="number">3</span><span class="special">;</span>
<span class="special">};</span>
<span class="special">};</span>
<span class="special">...</span>
<span class="identifier">assert</span><span class="special">(</span><a href="transform.html" title="transform"><tt class="computeroutput"><span class="identifier">transform</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">),</span> <span class="identifier">triple</span><span class="special">())</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">3</span><span class="special">,</span><span class="number">6</span><span class="special">,</span><span class="number">9</span><span class="special">));</span>
</pre>
</div>
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@ -1,128 +0,0 @@
<html>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>zip</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.functions.zip"></a><a href="zip.html" title="zip">zip</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.functions.zip.description"></a><h6>
<a name="id582491"></a>
<a href="zip.html#fusion.algorithms.transformation.functions.zip.description">Description</a>
</h6>
<p>
Zips sequences together to form a single sequence, whos members are tuples
of the members of the component sequences.
</p>
<a name="fusion.algorithms.transformation.functions.zip.synopsis"></a><h6>
<a name="id582524"></a>
<a href="zip.html#fusion.algorithms.transformation.functions.zip.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence1</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Sequence2</span><span class="special">,</span>
<span class="special">...</span>
<span class="keyword">typename</span> <span class="identifier">SequenceN</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/zip.html" title="zip"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">zip</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence1</span><span class="special">,</span> <span class="identifier">Sequence2</span><span class="special">,</span> <span class="special">...</span> <span class="identifier">SequenceN</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">zip</span><span class="special">(</span><span class="identifier">Sequence1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq1</span><span class="special">,</span> <span class="identifier">Sequence2</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq2</span><span class="special">,</span> <span class="special">...</span> <span class="identifier">SequenceN</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seqN</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id582807"></a><p class="title"><b>Table<EFBFBD>1.67.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td>
<tt class="computeroutput"><span class="identifier">seq1</span></tt> to <tt class="computeroutput"><span class="identifier">seqN</span></tt>
</td>
<td>Each sequence
is a model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.functions.zip.expression_semantics"></a><h6>
<a name="id582894"></a>
<a href="zip.html#fusion.algorithms.transformation.functions.zip.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="zip.html" title="zip"><tt class="computeroutput"><span class="identifier">zip</span></tt></a><span class="special">(</span><span class="identifier">seq1</span><span class="special">,</span> <span class="identifier">seq2</span><span class="special">,</span> <span class="special">...</span> <span class="identifier">seqN</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence containing
tuples of elements from sequences <tt class="computeroutput"><span class="identifier">seq1</span></tt>
to <tt class="computeroutput"><span class="identifier">seqN</span></tt>. For example,
applying zip to tuples <tt class="computeroutput"><span class="special">(</span><span class="number">1</span><span class="special">,</span><EFBFBD><span class="number">2</span><span class="special">,</span><EFBFBD><span class="number">3</span><span class="special">)</span></tt> and
<tt class="computeroutput"><span class="special">(</span><span class="char">'a'</span><span class="special">,</span><EFBFBD><span class="char">'b'</span><span class="special">,</span><EFBFBD><span class="char">'c'</span><span class="special">)</span></tt> would return <tt class="computeroutput"><span class="special">((</span><span class="number">1</span><span class="special">,</span><EFBFBD><span class="char">'a'</span><span class="special">),(</span><span class="number">2</span><span class="special">,</span><EFBFBD><span class="char">'b'</span><span class="special">),(</span><span class="number">3</span><span class="special">,</span><EFBFBD><span class="char">'c'</span><span class="special">))</span></tt>
</p>
<a name="fusion.algorithms.transformation.functions.zip.complexity"></a><h6>
<a name="id583194"></a>
<a href="zip.html#fusion.algorithms.transformation.functions.zip.complexity">Complexity</a>
</h6>
<p>
Constant. Returns a view which is lazily evaluated.
</p>
<a name="fusion.algorithms.transformation.functions.zip.header"></a><h6>
<a name="id583227"></a>
<a href="zip.html#fusion.algorithms.transformation.functions.zip.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">zip</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.transformation.functions.zip.example"></a><h6>
<a name="id583332"></a>
<a href="zip.html#fusion.algorithms.transformation.functions.zip.example">Example</a>
</h6>
<pre class="programlisting">
<a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">v1</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="char">'a'</span><span class="special">);</span>
<a href="../../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">v2</span><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="char">'b'</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="zip.html" title="zip"><tt class="computeroutput"><span class="identifier">zip</span></tt></a><span class="special">(</span><span class="identifier">v1</span><span class="special">,</span> <span class="identifier">v2</span><span class="special">)</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="number">2</span><span class="special">),</span><a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="char">'a'</span><span class="special">,</span> <span class="char">'b'</span><span class="special">));</span>
</pre>
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<dt><span class="section"><a href="metafunctions/filter.html">filter</a></span></dt>
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<dt><span class="section"><a href="metafunctions/join.html">join</a></span></dt>
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<dt><span class="section"><a href="metafunctions/pop_back.html">pop_back</a></span></dt>
<dt><span class="section"><a href="metafunctions/pop_front.html">pop_front</a></span></dt>
<dt><span class="section"><a href="metafunctions/push_back.html">push_back</a></span></dt>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.clear"></a><a href="clear.html" title="clear">clear</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.clear.description"></a><h6>
<a name="id591686"></a>
<a href="clear.html#fusion.algorithms.transformation.metafunctions.clear.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/clear.html" title="clear"><tt class="computeroutput"><span class="identifier">clear</span></tt></a>, given the input sequence
type.
</p>
<a name="fusion.algorithms.transformation.metafunctions.clear.synopsis"></a><h6>
<a name="id591735"></a>
<a href="clear.html#fusion.algorithms.transformation.metafunctions.clear.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">clear</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id591836"></a><p class="title"><b>Table<EFBFBD>1.80.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>Any
type</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.clear.expression_semantics"></a><h6>
<a name="id591904"></a>
<a href="clear.html#fusion.algorithms.transformation.metafunctions.clear.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="clear.html" title="clear"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">clear</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an empty sequence.
</p>
<a name="fusion.algorithms.transformation.metafunctions.clear.complexity"></a><h6>
<a name="id592018"></a>
<a href="clear.html#fusion.algorithms.transformation.metafunctions.clear.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.clear.header"></a><h6>
<a name="id592049"></a>
<a href="clear.html#fusion.algorithms.transformation.metafunctions.clear.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">clear</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="reverse.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="erase.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
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View File

@ -1,148 +0,0 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>erase</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
<link rel="up" href="../metafunctions.html" title="Metafunctions">
<link rel="prev" href="clear.html" title="clear">
<link rel="next" href="erase_key.html" title="erase_key">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.erase"></a><a href="erase.html" title="erase">erase</a></h5></div></div></div>
<p>
Returns the result type of <a href="../functions/erase.html" title="erase"><tt class="computeroutput"><span class="identifier">erase</span></tt></a>, given the input sequence
and range delimiting iterator types.
</p>
<a name="fusion.algorithms.transformation.metafunctions.erase.description"></a><h6>
<a name="id592199"></a>
<a href="erase.html#fusion.algorithms.transformation.metafunctions.erase.description">Description</a>
</h6>
<a name="fusion.algorithms.transformation.metafunctions.erase.synopsis"></a><h6>
<a name="id592226"></a>
<a href="erase.html#fusion.algorithms.transformation.metafunctions.erase.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">It1</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">It2</span> <span class="special">=</span> <span class="emphasis"><em>unspecified</em></span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">erase</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id592371"></a><p class="title"><b>Table<EFBFBD>1.81.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">It1</span></tt></td>
<td>A
model of <a href="../../../iterators/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">It2</span></tt></td>
<td>A
model of <a href="../../../iterators/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.erase.expression_semantics"></a><h6>
<a name="id592503"></a>
<a href="erase.html#fusion.algorithms.transformation.metafunctions.erase.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="erase.html" title="erase"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">erase</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">It1</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence with
the element at <tt class="computeroutput"><span class="identifier">It1</span></tt> removed.
</p>
<pre class="programlisting">
<a href="erase.html" title="erase"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">erase</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">It1</span><span class="special">,</span> <span class="identifier">It2</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a new sequence with
the elements between <tt class="computeroutput"><span class="identifier">It1</span></tt>
and <tt class="computeroutput"><span class="identifier">It2</span></tt> removed.
</p>
<a name="fusion.algorithms.transformation.metafunctions.erase.complexity"></a><h6>
<a name="id592764"></a>
<a href="erase.html#fusion.algorithms.transformation.metafunctions.erase.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.erase.header"></a><h6>
<a name="id592796"></a>
<a href="erase.html#fusion.algorithms.transformation.metafunctions.erase.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">erase</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="clear.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="erase_key.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>erase_key</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
<link rel="up" href="../metafunctions.html" title="Metafunctions">
<link rel="prev" href="erase.html" title="erase">
<link rel="next" href="insert.html" title="insert">
</head>
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<td align="center"><a href="../../../../../../../libraries.htm">Libraries</a></td>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.erase_key"></a><a href="erase_key.html" title="erase_key">erase_key</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.erase_key.description"></a><h6>
<a name="id592926"></a>
<a href="erase_key.html#fusion.algorithms.transformation.metafunctions.erase_key.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/erase_key.html" title="erase_key"><tt class="computeroutput"><span class="identifier">erase_key</span></tt></a>, given the sequence
and key types.
</p>
<a name="fusion.algorithms.transformation.metafunctions.erase_key.synopsis"></a><h6>
<a name="id592976"></a>
<a href="erase_key.html#fusion.algorithms.transformation.metafunctions.erase_key.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Key</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">erase_key</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id593095"></a><p class="title"><b>Table<EFBFBD>1.82.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/associative_sequence.html" title="Associative
Sequence">Associative
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Key</span></tt></td>
<td>Any
type</td>
<td>Key type</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.erase_key.expression_semantics"></a><h6>
<a name="id593191"></a>
<a href="erase_key.html#fusion.algorithms.transformation.metafunctions.erase_key.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="erase_key.html" title="erase_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">erase_key</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/associative_sequence.html" title="Associative
Sequence">Associative
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence with the
elements of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>,
except those with key <tt class="computeroutput"><span class="identifier">Key</span></tt>.
</p>
<a name="fusion.algorithms.transformation.metafunctions.erase_key.complexity"></a><h6>
<a name="id593335"></a>
<a href="erase_key.html#fusion.algorithms.transformation.metafunctions.erase_key.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.erase_key.header"></a><h6>
<a name="id593367"></a>
<a href="erase_key.html#fusion.algorithms.transformation.metafunctions.erase_key.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">erase_key</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="erase.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="insert.html"><img src="../../../../images/next.png" alt="Next"></a>
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@ -1,125 +0,0 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>filter</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.filter"></a><a href="filter.html" title="filter">filter</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.filter.description"></a><h6>
<a name="id586762"></a>
<a href="filter.html#fusion.algorithms.transformation.metafunctions.filter.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/filter.html" title="filter"><tt class="computeroutput"><span class="identifier">filter</span></tt></a> given the sequence type
and type to retain.
</p>
<a name="fusion.algorithms.transformation.metafunctions.filter.synopsis"></a><h6>
<a name="id586811"></a>
<a href="filter.html#fusion.algorithms.transformation.metafunctions.filter.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">filter</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id586929"></a><p class="title"><b>Table<EFBFBD>1.72.<2E>Parameter</b></p>
<table class="table" summary="Parameter">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>Type to retain</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.filter.expression_semantics"></a><h6>
<a name="id587026"></a>
<a href="filter.html#fusion.algorithms.transformation.metafunctions.filter.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="filter.html" title="filter"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">filter</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence containing
the elements of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
that are of type <tt class="computeroutput"><span class="identifier">T</span></tt>. Equivalent
to <tt class="computeroutput"><a href="filter_if.html" title="filter_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">filter_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span><EFBFBD><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">_</span><span class="special">,</span><EFBFBD><span class="identifier">T</span><span class="special">&gt;</span><EFBFBD><span class="special">&gt;::</span><span class="identifier">type</span></tt>.
</p>
<a name="fusion.algorithms.transformation.metafunctions.filter.complexity"></a><h6>
<a name="id587283"></a>
<a href="filter.html#fusion.algorithms.transformation.metafunctions.filter.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.filter.header"></a><h6>
<a name="id587315"></a>
<a href="filter.html#fusion.algorithms.transformation.metafunctions.filter.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">filter</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.filter_if"></a><a href="filter_if.html" title="filter_if">filter_if</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.filter_if.description"></a><h6>
<a name="id587443"></a>
<a href="filter_if.html#fusion.algorithms.transformation.metafunctions.filter_if.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/filter_if.html" title="filter_if"><tt class="computeroutput"><span class="identifier">filter_if</span></tt></a> given the sequence
and unary MPL Lambda Expression predicate type.
</p>
<a name="fusion.algorithms.transformation.metafunctions.filter_if.synopsis"></a><h6>
<a name="id587494"></a>
<a href="filter_if.html#fusion.algorithms.transformation.metafunctions.filter_if.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Pred</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">filter_if</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id587613"></a><p class="title"><b>Table<EFBFBD>1.73.<2E>Parameter</b></p>
<table class="table" summary="Parameter">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Pred</span></tt></td>
<td>A
unary MPL Lambda Expression</td>
<td>Type to retain</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.filter_if.expression_semantics"></a><h6>
<a name="id587709"></a>
<a href="filter_if.html#fusion.algorithms.transformation.metafunctions.filter_if.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="filter_if.html" title="filter_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">filter_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">Pred</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence containing
the elements of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
for which <tt class="computeroutput"><span class="identifier">Pred</span></tt> evaluates
to <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>.
</p>
<a name="fusion.algorithms.transformation.metafunctions.filter_if.complexity"></a><h6>
<a name="id587885"></a>
<a href="filter_if.html#fusion.algorithms.transformation.metafunctions.filter_if.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.filter_if.header"></a><h6>
<a name="id587917"></a>
<a href="filter_if.html#fusion.algorithms.transformation.metafunctions.filter_if.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">filter_if</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="filter.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="transform.html"><img src="../../../../images/next.png" alt="Next"></a>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>insert</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.insert"></a><a href="insert.html" title="insert">insert</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.insert.description"></a><h6>
<a name="id593498"></a>
<a href="insert.html#fusion.algorithms.transformation.metafunctions.insert.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/insert.html" title="insert"><tt class="computeroutput"><span class="identifier">insert</span></tt></a>, given the sequence,
position iterator and insertion types.
</p>
<a name="fusion.algorithms.transformation.metafunctions.insert.synopsis"></a><h6>
<a name="id593548"></a>
<a href="insert.html#fusion.algorithms.transformation.metafunctions.insert.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Position</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">insert</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id593684"></a><p class="title"><b>Table<EFBFBD>1.83.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Position</span></tt></td>
<td>A
model of <a href="../../../iterators/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.insert.expression_semantics"></a><h6>
<a name="id593809"></a>
<a href="insert.html#fusion.algorithms.transformation.metafunctions.insert.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="insert.html" title="insert"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">insert</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">Position</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence with an
element of type <tt class="computeroutput"><span class="identifier">T</span></tt> inserted
at position <tt class="computeroutput"><span class="identifier">Position</span></tt>
in <tt class="computeroutput"><span class="identifier">Sequence</span></tt>.
</p>
<a name="fusion.algorithms.transformation.metafunctions.insert.complexity"></a><h6>
<a name="id593976"></a>
<a href="insert.html#fusion.algorithms.transformation.metafunctions.insert.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.insert.header"></a><h6>
<a name="id594008"></a>
<a href="insert.html#fusion.algorithms.transformation.metafunctions.insert.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">insert</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.insert_range"></a><a href="insert_range.html" title="insert_range">insert_range</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.insert_range.description"></a><h6>
<a name="id594136"></a>
<a href="insert_range.html#fusion.algorithms.transformation.metafunctions.insert_range.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/insert_range.html" title="insert_range"><tt class="computeroutput"><span class="identifier">insert_range</span></tt></a>, given the input
sequence, position iterator and insertion range types.
</p>
<a name="fusion.algorithms.transformation.metafunctions.insert_range.synopsis"></a><h6>
<a name="id594187"></a>
<a href="insert_range.html#fusion.algorithms.transformation.metafunctions.insert_range.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Position</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Range</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">insert_range</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id594324"></a><p class="title"><b>Table<EFBFBD>1.84.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Position</span></tt></td>
<td>A
model of <a href="../../../iterators/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Range</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.insert_range.expression_semantics"></a><h6>
<a name="id594459"></a>
<a href="insert_range.html#fusion.algorithms.transformation.metafunctions.insert_range.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="insert_range.html" title="insert_range"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">insert_range</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">Position</span><span class="special">,</span> <span class="identifier">Range</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence with the
elements of <tt class="computeroutput"><span class="identifier">Range</span></tt> inserted
at position <tt class="computeroutput"><span class="identifier">Position</span></tt>
into <tt class="computeroutput"><span class="identifier">Sequence</span></tt>.
</p>
<a name="fusion.algorithms.transformation.metafunctions.insert_range.complexity"></a><h6>
<a name="id594626"></a>
<a href="insert_range.html#fusion.algorithms.transformation.metafunctions.insert_range.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.insert_range.header"></a><h6>
<a name="id594659"></a>
<a href="insert_range.html#fusion.algorithms.transformation.metafunctions.insert_range.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">insert_range</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="insert.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="join.html"><img src="../../../../images/next.png" alt="Next"></a>
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>join</title>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.join"></a><a href="join.html" title="join">join</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.join.description"></a><h6>
<a name="id594787"></a>
<a href="join.html#fusion.algorithms.transformation.metafunctions.join.description">Description</a>
</h6>
<p>
Returns the result of joining 2 sequences, given the sequence types.
</p>
<a name="fusion.algorithms.transformation.metafunctions.join.synopsis"></a><h6>
<a name="id594819"></a>
<a href="join.html#fusion.algorithms.transformation.metafunctions.join.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">LhSequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">RhSequence</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">join</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<a name="fusion.algorithms.transformation.metafunctions.join.expression_semantics"></a><h6>
<a name="id594948"></a>
<a href="join.html#fusion.algorithms.transformation.metafunctions.join.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="join.html" title="join"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">join</span></tt></a><span class="special">&lt;</span><span class="identifier">LhSequence</span><span class="special">,</span> <span class="identifier">RhSequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence containing
the elements of <tt class="computeroutput"><span class="identifier">LhSequence</span></tt>
followed by the elements of <tt class="computeroutput"><span class="identifier">RhSequence</span></tt>.
The order of the elements in the 2 sequences is preserved.
</p>
<a name="fusion.algorithms.transformation.metafunctions.join.complexity"></a><h6>
<a name="id595093"></a>
<a href="join.html#fusion.algorithms.transformation.metafunctions.join.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.join.header"></a><h6>
<a name="id595125"></a>
<a href="join.html#fusion.algorithms.transformation.metafunctions.join.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">join</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="insert_range.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="zip.html"><img src="../../../../images/next.png" alt="Next"></a>
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@ -1,115 +0,0 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>pop_back</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.pop_back"></a><a href="pop_back.html" title="pop_back">pop_back</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.pop_back.description"></a><h6>
<a name="id595904"></a>
<a href="pop_back.html#fusion.algorithms.transformation.metafunctions.pop_back.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/pop_back.html" title="pop_back"><tt class="computeroutput"><span class="identifier">pop_back</span></tt></a>, given the input sequence
type.
</p>
<a name="fusion.algorithms.transformation.metafunctions.pop_back.synopsis"></a><h6>
<a name="id595953"></a>
<a href="pop_back.html#fusion.algorithms.transformation.metafunctions.pop_back.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">pop_back</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id596054"></a><p class="title"><b>Table<EFBFBD>1.85.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.pop_back.expression_semantics"></a><h6>
<a name="id596131"></a>
<a href="pop_back.html#fusion.algorithms.transformation.metafunctions.pop_back.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="pop_back.html" title="pop_back"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">pop_back</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence with all
the elements of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
except the last element.
</p>
<a name="fusion.algorithms.transformation.metafunctions.pop_back.complexity"></a><h6>
<a name="id596256"></a>
<a href="pop_back.html#fusion.algorithms.transformation.metafunctions.pop_back.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.pop_back.header"></a><h6>
<a name="id596288"></a>
<a href="pop_back.html#fusion.algorithms.transformation.metafunctions.pop_back.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">tranformation</span><span class="special">/</span><span class="identifier">pop_back</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="zip.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="pop_front.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>pop_front</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.pop_front"></a><a href="pop_front.html" title="pop_front">pop_front</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.pop_front.description"></a><h6>
<a name="id596415"></a>
<a href="pop_front.html#fusion.algorithms.transformation.metafunctions.pop_front.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/pop_front.html" title="pop_front"><tt class="computeroutput"><span class="identifier">pop_front</span></tt></a>, given the input sequence
type.
</p>
<a name="fusion.algorithms.transformation.metafunctions.pop_front.synopsis"></a><h6>
<a name="id596466"></a>
<a href="pop_front.html#fusion.algorithms.transformation.metafunctions.pop_front.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">pop_front</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id596567"></a><p class="title"><b>Table<EFBFBD>1.86.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.pop_front.expression_semantics"></a><h6>
<a name="id596642"></a>
<a href="pop_front.html#fusion.algorithms.transformation.metafunctions.pop_front.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="pop_front.html" title="pop_front"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">pop_front</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence with all
the elements of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
except the first element.
</p>
<a name="fusion.algorithms.transformation.metafunctions.pop_front.complexity"></a><h6>
<a name="id596767"></a>
<a href="pop_front.html#fusion.algorithms.transformation.metafunctions.pop_front.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.pop_front.header"></a><h6>
<a name="id596799"></a>
<a href="pop_front.html#fusion.algorithms.transformation.metafunctions.pop_front.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">pop_front</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="pop_back.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="push_back.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>push_back</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.push_back"></a><a href="push_back.html" title="push_back">push_back</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.push_back.description"></a><h6>
<a name="id596927"></a>
<a href="push_back.html#fusion.algorithms.transformation.metafunctions.push_back.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">push_back</span></tt></a>, given the types of
the input sequence and element to push.
</p>
<a name="fusion.algorithms.transformation.metafunctions.push_back.synopsis"></a><h6>
<a name="id596979"></a>
<a href="push_back.html#fusion.algorithms.transformation.metafunctions.push_back.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">push_back</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id597097"></a><p class="title"><b>Table<EFBFBD>1.87.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.push_back.expression_semantics"></a><h6>
<a name="id597193"></a>
<a href="push_back.html#fusion.algorithms.transformation.metafunctions.push_back.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">push_back</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence with the
elements of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
and an element of type <tt class="computeroutput"><span class="identifier">T</span></tt>
added to the end.
</p>
<a name="fusion.algorithms.transformation.metafunctions.push_back.complexity"></a><h6>
<a name="id597338"></a>
<a href="push_back.html#fusion.algorithms.transformation.metafunctions.push_back.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.push_back.header"></a><h6>
<a name="id597370"></a>
<a href="push_back.html#fusion.algorithms.transformation.metafunctions.push_back.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">push_back</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.push_front"></a><a href="push_front.html" title="push_front">push_front</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.push_front.description"></a><h6>
<a name="id597498"></a>
<a href="push_front.html#fusion.algorithms.transformation.metafunctions.push_front.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/push_front.html" title="push_front"><tt class="computeroutput"><span class="identifier">push_front</span></tt></a>, given the types
of the input sequence and element to push.
</p>
<a name="fusion.algorithms.transformation.metafunctions.push_front.synopsis"></a><h6>
<a name="id597550"></a>
<a href="push_front.html#fusion.algorithms.transformation.metafunctions.push_front.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">push_front</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id597668"></a><p class="title"><b>Table<EFBFBD>1.88.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.push_front.expression_semantics"></a><h6>
<a name="id597764"></a>
<a href="push_front.html#fusion.algorithms.transformation.metafunctions.push_front.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="push_front.html" title="push_front"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">push_front</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence with the
elements of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
and an element of type <tt class="computeroutput"><span class="identifier">T</span></tt>
added to the beginning.
</p>
<a name="fusion.algorithms.transformation.metafunctions.push_front.complexity"></a><h6>
<a name="id597909"></a>
<a href="push_front.html#fusion.algorithms.transformation.metafunctions.push_front.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.push_front.header"></a><h6>
<a name="id597941"></a>
<a href="push_front.html#fusion.algorithms.transformation.metafunctions.push_front.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">push_front</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="push_back.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../tuples.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>remove</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.remove"></a><a href="remove.html" title="remove">remove</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.remove.description"></a><h6>
<a name="id589868"></a>
<a href="remove.html#fusion.algorithms.transformation.metafunctions.remove.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/remove.html" title="remove"><tt class="computeroutput"><span class="identifier">remove</span></tt></a>, given the sequence and
removal types.
</p>
<a name="fusion.algorithms.transformation.metafunctions.remove.synopsis"></a><h6>
<a name="id589917"></a>
<a href="remove.html#fusion.algorithms.transformation.metafunctions.remove.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">remove</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id590036"></a><p class="title"><b>Table<EFBFBD>1.77.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>Remove elements of this type</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.remove.expression_semantics"></a><h6>
<a name="id590131"></a>
<a href="remove.html#fusion.algorithms.transformation.metafunctions.remove.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="remove.html" title="remove"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">remove</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence containing
the elements of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
not of type <tt class="computeroutput"><span class="identifier">T</span></tt>. Equivalent
to <tt class="computeroutput"><a href="replace_if.html" title="replace_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">replace_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span><EFBFBD><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">_</span><span class="special">,</span><EFBFBD><span class="identifier">T</span><span class="special">&gt;</span><EFBFBD><span class="special">&gt;::</span><span class="identifier">type</span></tt>.
</p>
<a name="fusion.algorithms.transformation.metafunctions.remove.complexity"></a><h6>
<a name="id590387"></a>
<a href="remove.html#fusion.algorithms.transformation.metafunctions.remove.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.remove.header"></a><h6>
<a name="id590419"></a>
<a href="remove.html#fusion.algorithms.transformation.metafunctions.remove.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">remove</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="replace_if.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="remove_if.html"><img src="../../../../images/next.png" alt="Next"></a>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.remove_if"></a><a href="remove_if.html" title="remove_if">remove_if</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.remove_if.description"></a><h6>
<a name="id590547"></a>
<a href="remove_if.html#fusion.algorithms.transformation.metafunctions.remove_if.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/remove_if.html" title="remove_if"><tt class="computeroutput"><span class="identifier">remove_if</span></tt></a>, given the input sequence
and unary MPL Lambda Expression predicate types.
</p>
<a name="fusion.algorithms.transformation.metafunctions.remove_if.synopsis"></a><h6>
<a name="id590598"></a>
<a href="remove_if.html#fusion.algorithms.transformation.metafunctions.remove_if.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Pred</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">remove_if</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id590717"></a><p class="title"><b>Table<EFBFBD>1.78.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Pred</span></tt></td>
<td>A
model of unary MPL Lambda Expression</td>
<td>Remove elements
which evaluate to <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.remove_if.expression_semantics"></a><h6>
<a name="id590842"></a>
<a href="remove_if.html#fusion.algorithms.transformation.metafunctions.remove_if.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="remove_if.html" title="remove_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">remove_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">Pred</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence containing
the elements of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
for which <tt class="computeroutput"><span class="identifier">Pred</span></tt> evaluates
to <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></tt>.
</p>
<a name="fusion.algorithms.transformation.metafunctions.remove_if.complexity"></a><h6>
<a name="id591018"></a>
<a href="remove_if.html#fusion.algorithms.transformation.metafunctions.remove_if.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.remove_if.header"></a><h6>
<a name="id591050"></a>
<a href="remove_if.html#fusion.algorithms.transformation.metafunctions.remove_if.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">remove_if</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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<a accesskey="p" href="remove.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="reverse.html"><img src="../../../../images/next.png" alt="Next"></a>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.replace"></a><a href="replace.html" title="replace">replace</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.replace.description"></a><h6>
<a name="id588675"></a>
<a href="replace.html#fusion.algorithms.transformation.metafunctions.replace.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/replace.html" title="replace"><tt class="computeroutput"><span class="identifier">replace</span></tt></a>, given the types of
the input sequence and element to replace.
</p>
<a name="fusion.algorithms.transformation.metafunctions.replace.synopsis"></a><h6>
<a name="id588725"></a>
<a href="replace.html#fusion.algorithms.transformation.metafunctions.replace.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">replace</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id588843"></a><p class="title"><b>Table<EFBFBD>1.75.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>The type of the search and replacement objects</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.replace.expression_semantics"></a><h6>
<a name="id588939"></a>
<a href="replace.html#fusion.algorithms.transformation.metafunctions.replace.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="replace.html" title="replace"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">replace</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/replace.html" title="replace"><tt class="computeroutput"><span class="identifier">replace</span></tt></a>.
</p>
<a name="fusion.algorithms.transformation.metafunctions.replace.complexity"></a><h6>
<a name="id589079"></a>
<a href="replace.html#fusion.algorithms.transformation.metafunctions.replace.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.replace.header"></a><h6>
<a name="id589111"></a>
<a href="replace.html#fusion.algorithms.transformation.metafunctions.replace.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">replace</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="transform.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="replace_if.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.replace_if"></a><a href="replace_if.html" title="replace_if">replace_if</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.replace_if.description"></a><h6>
<a name="id589238"></a>
<a href="replace_if.html#fusion.algorithms.transformation.metafunctions.replace_if.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/replace_if.html" title="replace_if"><tt class="computeroutput"><span class="identifier">replace_if</span></tt></a>, given the types
of the sequence, <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a> predicate and replacement object.
</p>
<a name="fusion.algorithms.transformation.metafunctions.replace_if.synopsis"></a><h6>
<a name="id589298"></a>
<a href="replace_if.html#fusion.algorithms.transformation.metafunctions.replace_if.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">replace_if</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id589433"></a><p class="title"><b>Table<EFBFBD>1.76.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
model of unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>Replacement predicate</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>The type of the replacement object</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.replace_if.expression_semantics"></a><h6>
<a name="id589558"></a>
<a href="replace_if.html#fusion.algorithms.transformation.metafunctions.replace_if.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="replace_if.html" title="replace_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">replace_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span><span class="identifier">F</span><span class="special">,</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/replace_if.html" title="replace_if"><tt class="computeroutput"><span class="identifier">replace_if</span></tt></a>.
</p>
<a name="fusion.algorithms.transformation.metafunctions.replace_if.complexity"></a><h6>
<a name="id589708"></a>
<a href="replace_if.html#fusion.algorithms.transformation.metafunctions.replace_if.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.replace_if.header"></a><h6>
<a name="id589740"></a>
<a href="replace_if.html#fusion.algorithms.transformation.metafunctions.replace_if.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">replace_if</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="replace.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="remove.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>reverse</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.reverse"></a><a href="reverse.html" title="reverse">reverse</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.reverse.description"></a><h6>
<a name="id591178"></a>
<a href="reverse.html#fusion.algorithms.transformation.metafunctions.reverse.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/reverse.html" title="reverse"><tt class="computeroutput"><span class="identifier">reverse</span></tt></a>, given the input sequence
type.
</p>
<a name="fusion.algorithms.transformation.metafunctions.reverse.synopsis"></a><h6>
<a name="id591227"></a>
<a href="reverse.html#fusion.algorithms.transformation.metafunctions.reverse.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">reverse</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id591328"></a><p class="title"><b>Table<EFBFBD>1.79.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>
</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.reverse.expression_semantics"></a><h6>
<a name="id591404"></a>
<a href="reverse.html#fusion.algorithms.transformation.metafunctions.reverse.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="reverse.html" title="reverse"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">reverse</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence with the
elements in the reverse order to <tt class="computeroutput"><span class="identifier">Sequence</span></tt>.
</p>
<a name="fusion.algorithms.transformation.metafunctions.reverse.complexity"></a><h6>
<a name="id591527"></a>
<a href="reverse.html#fusion.algorithms.transformation.metafunctions.reverse.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.reverse.header"></a><h6>
<a name="id591559"></a>
<a href="reverse.html#fusion.algorithms.transformation.metafunctions.reverse.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">reverse</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="remove_if.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="clear.html"><img src="../../../../images/next.png" alt="Next"></a>
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>transform</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.transform"></a><a href="transform.html" title="transform">transform</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.transform.description"></a><h6>
<a name="id588045"></a>
<a href="transform.html#fusion.algorithms.transformation.metafunctions.transform.description">Description</a>
</h6>
<p>
Returns the result of type <a href="../functions/transform.html" title="transform"><tt class="computeroutput"><span class="identifier">transform</span></tt></a>, given the sequence
and <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a> types.
</p>
<a name="fusion.algorithms.transformation.metafunctions.transform.synopsis"></a><h6>
<a name="id588105"></a>
<a href="transform.html#fusion.algorithms.transformation.metafunctions.transform.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">transform</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id588224"></a><p class="title"><b>Table<EFBFBD>1.74.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a><EFBFBD></td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
model of unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>Transformation function object</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.transformation.metafunctions.transform.expression_semantics"></a><h6>
<a name="id588330"></a>
<a href="transform.html#fusion.algorithms.transformation.metafunctions.transform.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="transform.html" title="transform"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">transform</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns a sequence with values
<tt class="computeroutput"><span class="identifier">F</span><span class="special">::</span><span class="identifier">apply</span><span class="special">&lt;</span><span class="identifier">E</span><span class="special">&gt;::</span><span class="identifier">type</span></tt> for each element type <tt class="computeroutput"><span class="identifier">E</span></tt> in <tt class="computeroutput"><span class="identifier">Sequence</span></tt>.
</p>
<a name="fusion.algorithms.transformation.metafunctions.transform.complexity"></a><h6>
<a name="id588516"></a>
<a href="transform.html#fusion.algorithms.transformation.metafunctions.transform.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.transform.header"></a><h6>
<a name="id588548"></a>
<a href="transform.html#fusion.algorithms.transformation.metafunctions.transform.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">transform</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.transformation.metafunctions.zip"></a><a href="zip.html" title="zip">zip</a></h5></div></div></div>
<a name="fusion.algorithms.transformation.metafunctions.zip.description"></a><h6>
<a name="id595251"></a>
<a href="zip.html#fusion.algorithms.transformation.metafunctions.zip.description">Description</a>
</h6>
<p>
Zips sequences together to form a single sequence, whos members are tuples
of the members of the component sequences.
</p>
<a name="fusion.algorithms.transformation.metafunctions.zip.synopsis"></a><h6>
<a name="id595285"></a>
<a href="zip.html#fusion.algorithms.transformation.metafunctions.zip.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Sequence1</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Sequence2</span><span class="special">,</span>
<span class="special">...</span>
<span class="keyword">typename</span> <span class="identifier">SequenceN</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">zip</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<a name="fusion.algorithms.transformation.metafunctions.zip.expression_semantics"></a><h6>
<a name="id595437"></a>
<a href="zip.html#fusion.algorithms.transformation.metafunctions.zip.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="zip.html" title="zip"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">zip</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence1</span><span class="special">,</span> <span class="identifier">Sequence2</span><span class="special">,</span> <span class="special">...</span> <span class="identifier">SequenceN</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the most restrictive
traversal category of sequences <tt class="computeroutput"><span class="identifier">Sequence1</span></tt>
to <tt class="computeroutput"><span class="identifier">SequenceN</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Return a sequence containing
tuples of elements from each sequence. For example, applying zip to tuples
<tt class="computeroutput"><span class="special">(</span><span class="number">1</span><span class="special">,</span><EFBFBD><span class="number">2</span><span class="special">,</span><EFBFBD><span class="number">3</span><span class="special">)</span></tt> and <tt class="computeroutput"><span class="special">(</span><span class="char">'a'</span><span class="special">,</span><EFBFBD><span class="char">'b'</span><span class="special">,</span><EFBFBD><span class="char">'c'</span><span class="special">)</span></tt> would
return <tt class="computeroutput"><span class="special">((</span><span class="number">1</span><span class="special">,</span><EFBFBD><span class="char">'a'</span><span class="special">),(</span><span class="number">2</span><span class="special">,</span><EFBFBD><span class="char">'b'</span><span class="special">),(</span><span class="number">3</span><span class="special">,</span><EFBFBD><span class="char">'c'</span><span class="special">))</span></tt>
</p>
<a name="fusion.algorithms.transformation.metafunctions.zip.complexity"></a><h6>
<a name="id595746"></a>
<a href="zip.html#fusion.algorithms.transformation.metafunctions.zip.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.transformation.metafunctions.zip.header"></a><h6>
<a name="id595777"></a>
<a href="zip.html#fusion.algorithms.transformation.metafunctions.zip.header">Header</a>
</h6>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">zip</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
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<p>
This section summarizes significant changes to the Fusion library.
</p>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="fusion.extension"></a><a href="extension.html" title="Extension">Extension</a></h2></div></div></div>
<p>
The Fusion library is designed to be extensible, new sequences types can easily
be added. In fact, the library support for <tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></tt>,
<tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></tt> and <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
sequences is entirely provided using the extension mechanism.
</p>
<p>
The process for adding a new sequence type to Fusion is:
</p>
<div class="orderedlist"><ol type="1">
<li>
Enable the <a href="notes.html#fusion.notes.tag_dispatching"><span class="emphasis"><em>tag dispatching</em></span></a>
mechanism used by Fusion for your sequence type
</li>
<li>
Design an iterator type for the sequence
</li>
<li>
Provide specialized behaviour for the intrinsic operations of the new Fusion
sequence
</li>
</ol></div>
<a name="fusion.extension.our_example"></a><h3>
<a name="id606290"></a>
<a href="extension.html#fusion.extension.our_example">Our example</a>
</h3>
<p>
In order to illustrate enabling a new sequence type for use with Fusion, we
are going to use the type:
</p>
<pre class="programlisting">
<span class="keyword">namespace</span> <span class="identifier">example</span>
<span class="special">{</span>
<span class="keyword">struct</span> <span class="identifier">example_struct</span>
<span class="special">{</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">name</span><span class="special">;</span>
<span class="keyword">int</span> <span class="identifier">age</span><span class="special">;</span>
<span class="identifier">example_struct</span><span class="special">(</span>
<span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&amp;</span> <span class="identifier">n</span><span class="special">,</span>
<span class="keyword">int</span> <span class="identifier">a</span><span class="special">)</span>
<span class="special">:</span> <span class="identifier">name</span><span class="special">(</span><span class="identifier">n</span><span class="special">),</span> <span class="identifier">age</span><span class="special">(</span><span class="identifier">a</span><span class="special">)</span>
<span class="special">{}</span>
<span class="special">};</span>
<span class="special">}</span>
</pre>
<p>
We are going to pretend that this type has been provided by a 3rd party library,
and therefore cannot be modified. We shall work through all the necessary steps
to enable <tt class="computeroutput"><span class="identifier">example_struct</span></tt> to
serve as an <a href="sequences/concepts/associative_sequence.html" title="Associative
Sequence">Associative
Sequence</a> as described in the <a href="quick_start.html" title="Quick Start">Quick
Start</a> guide.
</p>
<a name="fusion.extension.enabling_tag_dispatching"></a><h3>
<a name="id606572"></a>
<a href="extension.html#fusion.extension.enabling_tag_dispatching">Enabling Tag Dispatching</a>
</h3>
<p>
The Fusion extensibility mechanism uses <a href="notes.html#fusion.notes.tag_dispatching"><span class="emphasis"><em>tag
dispatching</em></span></a> to call the correct code for a given sequence
type. In order to exploit the tag dispatching mechanism we must first declare
a new tag type for the mechanism to use. For example:
</p>
<pre class="programlisting">
<span class="keyword">namespace</span> <span class="identifier">example</span> <span class="special">{</span>
<span class="keyword">struct</span> <span class="identifier">example_sequence_tag</span><span class="special">;</span> <span class="comment">// Only definition needed
</span><span class="special">}</span>
</pre>
<p>
Next we need to enable the <tt class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">tag_of</span></tt>
metafunction to return our newly chosen tag type for operations involving our
sequence. This is done by specializing <tt class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">tag_of</span></tt>
for our sequence type.
</p>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">support</span><span class="special">/</span><span class="identifier">tag_of_fwd</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">fusion</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">traits</span> <span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;&gt;</span>
<span class="keyword">struct</span> <span class="identifier">tag_of</span><span class="special">&lt;</span><span class="identifier">example_struct</span><span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">example</span><span class="special">::</span><span class="identifier">example_sequence_tag</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
<span class="special">}}}</span>
</pre>
<p>
<tt class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">tag_of</span></tt> also has a second template argument,
that can be used in conjuction with <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">enable_if</span></tt>
to provide tag support for groups of related types. This feature is not necessary
for our sequence, but for an example see the code in:
</p>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">sequence</span><span class="special">/</span><span class="identifier">adapted</span><span class="special">/</span><span class="identifier">mpl</span><span class="special">/</span><span class="identifier">tag_of</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.extension.designing_a_suitable_iterator"></a><h3>
<a name="id607064"></a>
<a href="extension.html#fusion.extension.designing_a_suitable_iterator">Designing a
suitable iterator</a>
</h3>
<p>
We need an iterator to describe positions, and provide access to the data within
our sequence. As it is straightforward to do, we are going to provide a random
access iterator in our example.
</p>
<p>
We will use a simple design, in which the 2 members of <tt class="computeroutput"><span class="identifier">example_struct</span></tt>
are given numbered indices, 0 for <tt class="computeroutput"><span class="identifier">name</span></tt>
and 1 for <tt class="computeroutput"><span class="identifier">age</span></tt> respectively.
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Struct</span><span class="special">,</span> <span class="keyword">int</span> <span class="identifier">Pos</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">example_struct_iterator</span>
<span class="special">:</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">fusion</span><span class="special">::</span><span class="identifier">iterator_base</span><span class="special">&lt;</span><span class="identifier">example_struct_iterator</span><span class="special">&lt;</span><span class="identifier">Struct</span><span class="special">,</span> <span class="identifier">Pos</span><span class="special">&gt;</span> <span class="special">&gt;</span>
<span class="special">{</span>
<span class="identifier">BOOST_STATIC_ASSERT</span><span class="special">(</span><span class="identifier">Pos</span> <span class="special">&gt;=</span><span class="number">0</span> <span class="special">&amp;&amp;</span> <span class="identifier">Pos</span> <span class="special">&lt;</span> <span class="number">3</span><span class="special">);</span>
<span class="keyword">typedef</span> <span class="identifier">Struct</span> <span class="identifier">struct_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special">&lt;</span><span class="identifier">Pos</span><span class="special">&gt;</span> <span class="identifier">index</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">fusion</span><span class="special">::</span><span class="identifier">random_access_traversal_tag</span> <span class="identifier">category</span><span class="special">;</span>
<span class="identifier">example_struct_iterator</span><span class="special">(</span><span class="identifier">Struct</span><span class="special">&amp;</span> <span class="identifier">str</span><span class="special">)</span>
<span class="special">:</span> <span class="identifier">struct_</span><span class="special">(</span><span class="identifier">str</span><span class="special">)</span> <span class="special">{}</span>
<span class="identifier">Struct</span><span class="special">&amp;</span> <span class="identifier">struct_</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<p>
A quick summary of the details of our iterator:
</p>
<div class="orderedlist"><ol type="1">
<li>
The iterator is parameterized by the type it is iterating over, and the index
of the current element.
</li>
<li>
The typedefs <tt class="computeroutput"><span class="identifier">struct_type</span></tt>
and <tt class="computeroutput"><span class="identifier">index</span></tt> provide convenient
access to information we will need later in the implementation.
</li>
<li>
The typedef <tt class="computeroutput"><span class="identifier">category</span></tt> allows
the <tt class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><a href="support/category_of.html" title="category_of"><tt class="computeroutput"><span class="identifier">category_of</span></tt></a></tt>
metafunction to establish the traversal category of the iterator.
</li>
<li>
The constructor stores a reference to the <tt class="computeroutput"><span class="identifier">example_struct</span></tt>
being iterated over.
</li>
</ol></div>
<p>
We also need to enable <a href="notes.html#fusion.notes.tag_dispatching"><span class="emphasis"><em>tag
dispatching</em></span></a> for our iterator type, with another specialization
of <tt class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">tag_of</span></tt>.
</p>
<p>
In isolation, the iterator implementation is pretty dry. Things should become
clearer as we add features to our implementation.
</p>
<a name="fusion.extension.a_first_couple_of_instructive_features"></a><h3>
<a name="id607700"></a>
<a href="extension.html#fusion.extension.a_first_couple_of_instructive_features">A first
couple of instructive features</a>
</h3>
<p>
To start with, we will get the <a href="iterators/metafunctions/value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a> metafunction working. To
do this, we provide a specialization of the <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">fusion</span><span class="special">::</span><span class="identifier">extension</span><span class="special">::</span><span class="identifier">value_of_impl</span></tt>
template for our iterator's tag type.
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;&gt;</span>
<span class="keyword">struct</span> <span class="identifier">value_of_impl</span><span class="special">&lt;</span><span class="identifier">example</span><span class="special">::</span><span class="identifier">example_struct_iterator_tag</span><span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Struct</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span><span class="special">&lt;</span><span class="identifier">example</span><span class="special">::</span><span class="identifier">example_struct_iterator</span><span class="special">&lt;</span><span class="identifier">Struct</span><span class="special">,</span> <span class="number">0</span><span class="special">&gt;</span> <span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Struct</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span><span class="special">&lt;</span><span class="identifier">example</span><span class="special">::</span><span class="identifier">example_struct_iterator</span><span class="special">&lt;</span><span class="identifier">Struct</span><span class="special">,</span> <span class="number">1</span><span class="special">&gt;</span> <span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">int</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
<span class="special">};</span>
</pre>
<p>
The implementation itself is pretty simple, it just uses 2 partial specializations
to provide the type of the 2 different members of <tt class="computeroutput"><span class="identifier">example_struct</span></tt>,
based on the index of the iterator.
</p>
<p>
To understand how <tt class="computeroutput"><span class="identifier">value_of_impl</span></tt>
is used by the library we will look at the implementation of <a href="iterators/metafunctions/value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">value_of</span></tt></a>:
</p>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <a href="iterators/metafunctions/value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">value_of</span></tt></a>
<span class="special">:</span> <span class="identifier">extension</span><span class="special">::</span><span class="identifier">value_of_impl</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">detail</span><span class="special">::</span><span class="identifier">tag_of</span><span class="special">&lt;</span><span class="identifier">Iterator</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;::</span>
<span class="keyword">template</span> <span class="identifier">apply</span><span class="special">&lt;</span><span class="identifier">Iterator</span><span class="special">&gt;</span>
<span class="special">{};</span>
</pre>
<p>
So <a href="iterators/metafunctions/value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">value_of</span></tt></a>
uses <a href="notes.html#fusion.notes.tag_dispatching"><span class="emphasis"><em>tag dispatching</em></span></a>
to select an MPL Metafunction Class to provide its functionality. You will
notice this pattern throughout the implementation of Fusion.
</p>
<p>
Ok, lets enable dereferencing of our iterator. In this case we must provide
a suitable specialization of <tt class="computeroutput"><span class="identifier">deref_impl</span></tt>.
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;&gt;</span>
<span class="keyword">struct</span> <span class="identifier">deref_impl</span><span class="special">&lt;</span><span class="identifier">example</span><span class="special">::</span><span class="identifier">example_struct_iterator_tag</span><span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Struct</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span><span class="special">&lt;</span><span class="identifier">example</span><span class="special">::</span><span class="identifier">example_struct_iterator</span><span class="special">&lt;</span><span class="identifier">Struct</span><span class="special">,</span> <span class="number">0</span><span class="special">&gt;</span> <span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">if_</span><span class="special">&lt;</span>
<span class="identifier">is_const</span><span class="special">&lt;</span><span class="identifier">Struct</span><span class="special">&gt;,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&amp;,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span> <span class="identifier">type</span><span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">type</span>
<span class="identifier">call</span><span class="special">(</span><span class="identifier">example</span><span class="special">::</span><span class="identifier">example_struct_iterator</span><span class="special">&lt;</span><span class="identifier">Struct</span><span class="special">,</span> <span class="number">0</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">it</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">it</span><span class="special">.</span><span class="identifier">struct_</span><span class="special">.</span><span class="identifier">name</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Struct</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span><span class="special">&lt;</span><span class="identifier">example</span><span class="special">::</span><span class="identifier">example_struct_iterator</span><span class="special">&lt;</span><span class="identifier">Struct</span><span class="special">,</span> <span class="number">1</span><span class="special">&gt;</span> <span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">if_</span><span class="special">&lt;</span>
<span class="identifier">is_const</span><span class="special">&lt;</span><span class="identifier">Struct</span><span class="special">&gt;,</span> <span class="keyword">int</span> <span class="keyword">const</span><span class="special">&amp;,</span> <span class="keyword">int</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span> <span class="identifier">type</span><span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">type</span>
<span class="identifier">call</span><span class="special">(</span><span class="identifier">example</span><span class="special">::</span><span class="identifier">example_struct_iterator</span><span class="special">&lt;</span><span class="identifier">Struct</span><span class="special">,</span> <span class="number">1</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">it</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">it</span><span class="special">.</span><span class="identifier">struct_</span><span class="special">.</span><span class="identifier">age</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">};</span>
<span class="special">}</span>
</pre>
<p>
The use of <tt class="computeroutput"><span class="identifier">deref_impl</span></tt> is very
similar to that of <tt class="computeroutput"><span class="identifier">value_of_impl</span></tt>,
but it also provides some runtime functionality this time via the <tt class="computeroutput"><span class="identifier">call</span></tt> static member function. To see how
<tt class="computeroutput"><span class="identifier">deref_impl</span></tt> is used, lets have
a look at the implementation of <a href="iterators/functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a>:
</p>
<pre class="programlisting">
<span class="keyword">namespace</span> <span class="identifier">result_of</span>
<span class="special">{</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <a href="iterators/functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a>
<span class="special">:</span> <span class="identifier">extension</span><span class="special">::</span><span class="identifier">deref_impl</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">detail</span><span class="special">::</span><span class="identifier">tag_of</span><span class="special">&lt;</span><span class="identifier">Iterator</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;::</span>
<span class="keyword">template</span> <span class="identifier">apply</span><span class="special">&lt;</span><span class="identifier">Iterator</span><span class="special">&gt;</span>
<span class="special">{};</span>
<span class="special">}</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span><span class="special">&lt;</span><span class="identifier">Iterator</span><span class="special">&gt;::</span><span class="identifier">type</span>
<a href="iterators/functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">Iterator</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span><span class="special">&lt;</span><span class="identifier">Iterator</span><span class="special">&gt;</span> <span class="identifier">deref_meta</span><span class="special">;</span>
<span class="keyword">return</span> <span class="identifier">deref_meta</span><span class="special">::</span><span class="identifier">call</span><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
<span class="special">}</span>
</pre>
<p>
So again <a href="iterators/metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a> uses <a href="notes.html#fusion.notes.tag_dispatching"><span class="emphasis"><em>tag
dispatching</em></span></a> in exactly the same way as the <a href="iterators/metafunctions/value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">value_of</span></tt></a> implementation. The runtime
functionality used by <a href="iterators/functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a> is provided by the <tt class="computeroutput"><span class="identifier">call</span></tt> static function of the selected MPL
Metafunction Class.
</p>
<p>
The actual implementation of <tt class="computeroutput"><span class="identifier">deref_impl</span></tt>
is slightly more complex than that of <tt class="computeroutput"><span class="identifier">value_of_impl</span></tt>.
We also need to implement the <tt class="computeroutput"><span class="identifier">call</span></tt>
function, which returns a reference to the appropriate member of the underlying
sequence. We also require a little bit of metaprogramming to return <tt class="computeroutput"><span class="keyword">const</span></tt> references if the underlying sequence
is const.
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td colspan="2" align="left" valign="top"><p>
Although there is a fair amount of left to do to produce a fully fledged
Fusion sequence, <a href="iterators/metafunctions/value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">value_of</span></tt></a> and <a href="iterators/functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a> illustrate all the signficant
concepts required. The remainder of the process is very repetitive, simply
requiring implementation of a suitable <tt class="computeroutput"><span class="identifier">xxxx_impl</span></tt>
for each feature <tt class="computeroutput"><span class="identifier">xxxx</span></tt>.
</p></td></tr>
</table></div>
<a name="fusion.extension.implementing_the_remaining_iterator_functionality"></a><h3>
<a name="id609940"></a>
<a href="extension.html#fusion.extension.implementing_the_remaining_iterator_functionality">Implementing
the remaining iterator functionality</a>
</h3>
<p>
Ok, now we have seen the way <a href="iterators/metafunctions/value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">value_of</span></tt></a> and <a href="iterators/functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a> work, everything else will work
in pretty much the same way. Lets start with forward iteration, by providing
a <tt class="computeroutput"><span class="identifier">next_impl</span></tt>:
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;&gt;</span>
<span class="keyword">struct</span> <span class="identifier">next_impl</span><span class="special">&lt;</span><span class="identifier">example</span><span class="special">::</span><span class="identifier">example_struct_iterator_tag</span><span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">::</span><span class="identifier">struct_type</span> <span class="identifier">struct_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">::</span><span class="identifier">index</span> <span class="identifier">index</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">example</span><span class="special">::</span><span class="identifier">example_struct_iterator</span><span class="special">&lt;</span><span class="identifier">struct_type</span><span class="special">,</span> <span class="identifier">index</span><span class="special">::</span><span class="identifier">value</span> <span class="special">+</span> <span class="number">1</span><span class="special">&gt;</span> <span class="identifier">type</span><span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">type</span>
<span class="identifier">call</span><span class="special">(</span><span class="identifier">Iterator</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">type</span><span class="special">(</span><span class="identifier">i</span><span class="special">.</span><span class="identifier">struct_</span><span class="special">);</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">};</span>
</pre>
<p>
This should be very familiar from our <tt class="computeroutput"><span class="identifier">deref_impl</span></tt>
implementation, we will be using this approach again and again now. Our design
is simply to increment the <tt class="computeroutput"><span class="identifier">index</span></tt>
counter to move on to the next element. The various other iterator manipulations
we need to perform will all just involve simple calculations with the <tt class="computeroutput"><span class="identifier">index</span></tt> variables.
</p>
<p>
We also need to provide a suitable <tt class="computeroutput"><span class="identifier">equal_to_impl</span></tt>
so that iterators can be correctly compared. A <a href="iterators/concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> will also need an implementation of <tt class="computeroutput"><span class="identifier">prior_impl</span></tt>.
For a <a href="iterators/concepts/random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a><EFBFBD><tt class="computeroutput"><span class="identifier">distance_impl</span></tt>
and <tt class="computeroutput"><span class="identifier">advance_impl</span></tt> also need
to be provided in order to satisfy the necessary complexity guarantees. As
our iterator is a <a href="iterators/concepts/random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a> we will have to implement all of these functions.
</p>
<p>
Full implementations of <tt class="computeroutput"><span class="identifier">prior_impl</span></tt>,
<tt class="computeroutput"><span class="identifier">advance_impl</span></tt>, <tt class="computeroutput"><span class="identifier">distance_impl</span></tt> and <tt class="computeroutput"><span class="identifier">equal_to_impl</span></tt>
are provided in the example code.
</p>
<a name="fusion.extension.implementing_the_intrinsic_functions_of_the_sequence"></a><h3>
<a name="id610564"></a>
<a href="extension.html#fusion.extension.implementing_the_intrinsic_functions_of_the_sequence">Implementing
the intrinsic functions of the sequence</a>
</h3>
<p>
In order that Fusion can correctly identify our sequence as a Fusion sequence,
we need to enable <tt class="computeroutput"><span class="identifier">is_sequence</span></tt>
for our sequence type. As usual we just create an <tt class="computeroutput"><span class="identifier">impl</span></tt>
type specialized for our sequence tag:
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;&gt;</span>
<span class="keyword">struct</span> <span class="identifier">is_sequence_impl</span><span class="special">&lt;</span><span class="identifier">example</span><span class="special">::</span><span class="identifier">example_sequence_tag</span><span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span> <span class="special">:</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span> <span class="special">{};</span>
<span class="special">};</span>
</pre>
<p>
We've some similar formalities to complete, providing <tt class="computeroutput"><span class="identifier">category_of_impl</span></tt>
so Fusion can correctly identify our sequence type, and <tt class="computeroutput"><span class="identifier">is_view_impl</span></tt>
so Fusion can correctly identify our sequence as not being a <a href="sequences/views.html" title="Views">View</a>
type. Implementations are provide in the example code.
</p>
<p>
Now we've completed some formalities, on to more interesting features. Lets
get <a href="sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a> working so that we can get an
iterator to start accessing the data in our sequence.
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;&gt;</span>
<span class="keyword">struct</span> <span class="identifier">begin_impl</span><span class="special">&lt;</span><span class="identifier">example</span><span class="special">::</span><span class="identifier">example_sequence_tag</span><span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">example</span><span class="special">::</span><span class="identifier">example_struct_iterator</span><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="number">0</span><span class="special">&gt;</span> <span class="identifier">type</span><span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">type</span>
<span class="identifier">call</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">type</span><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">};</span>
</pre>
<p>
The implementation uses the same ideas we have applied throughout, in this
case we are just creating one of the iterators we developed earlier, pointing
to the first element in the sequence. The implementation of <a href="sequences/intrinsics/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a> is very similar, and is provided
in the example code.
</p>
<p>
For our <a href="sequences/concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a> we will also need to implement <tt class="computeroutput"><span class="identifier">size_impl</span></tt>,
<tt class="computeroutput"><span class="identifier">value_at_impl</span></tt> and <tt class="computeroutput"><span class="identifier">at_impl</span></tt>.
</p>
<a name="fusion.extension.enabling_our_type_as_an_associative_container"></a><h3>
<a name="id611146"></a>
<a href="extension.html#fusion.extension.enabling_our_type_as_an_associative_container">Enabling
our type as an associative container</a>
</h3>
<p>
In order for <tt class="computeroutput"><span class="identifier">example_struct</span></tt>
to serve as an associative container, we need to enable 3 lookup features,
<a href="sequences/intrinsics/functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a>, <a href="sequences/intrinsics/metafunctions/value_at_key.html" title="value_at_key"><tt class="computeroutput"><span class="identifier">value_at_key</span></tt></a> and <a href="sequences/intrinsics/functions/has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">has_key</span></tt></a>. We also need to provide an
implementation of the <tt class="computeroutput"><span class="identifier">is_associative</span></tt>
trait so that our sequence can be correctly identified as an associative container.
</p>
<p>
To implement <tt class="computeroutput"><span class="identifier">at_key_impl</span></tt> we
need to associate the <tt class="computeroutput"><span class="identifier">fields</span><span class="special">::</span><span class="identifier">age</span></tt> and
<tt class="computeroutput"><span class="identifier">fields</span><span class="special">::</span><span class="identifier">age</span></tt> types described in the <a href="quick_start.html" title="Quick Start">Quick
Start</a> guide with the appropriate members of <tt class="computeroutput"><span class="identifier">example_struct</span></tt>.
Our implementation is as follows:
</p>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;&gt;</span>
<span class="keyword">struct</span> <span class="identifier">at_key_impl</span><span class="special">&lt;</span><span class="identifier">example</span><span class="special">::</span><span class="identifier">example_sequence_tag</span><span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">fields</span><span class="special">::</span><span class="identifier">name</span><span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">if_</span><span class="special">&lt;</span>
<span class="identifier">is_const</span><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;,</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&amp;,</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span> <span class="identifier">type</span><span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">type</span>
<span class="identifier">call</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">seq</span><span class="special">.</span><span class="identifier">name</span><span class="special">;</span>
<span class="special">};</span>
<span class="special">};</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">fields</span><span class="special">::</span><span class="identifier">age</span><span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">if_</span><span class="special">&lt;</span>
<span class="identifier">is_const</span><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;,</span>
<span class="keyword">int</span> <span class="keyword">const</span><span class="special">&amp;,</span>
<span class="keyword">int</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span> <span class="identifier">type</span><span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">type</span>
<span class="identifier">call</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">seq</span><span class="special">.</span><span class="identifier">age</span><span class="special">;</span>
<span class="special">};</span>
<span class="special">};</span>
<span class="special">};</span>
</pre>
<p>
Its all very similar to the implementations we've seen previously, such as
<tt class="computeroutput"><span class="identifier">deref_impl</span></tt> and <tt class="computeroutput"><span class="identifier">value_of_impl</span></tt>. Instead of identifying the
members by index or position, we are now selecting them using the types <tt class="computeroutput"><span class="identifier">fields</span><span class="special">::</span><span class="identifier">name</span></tt> and <tt class="computeroutput"><span class="identifier">fields</span><span class="special">::</span><span class="identifier">age</span></tt>. The
implementations of <tt class="computeroutput"><span class="identifier">value_at_key_impl</span></tt>
and <tt class="computeroutput"><span class="identifier">has_key_impl</span></tt> are equally
straightforward, and are provided in the example code, along with an implementation
of <tt class="computeroutput"><span class="identifier">is_associative_impl</span></tt>.
</p>
<a name="fusion.extension.summary"></a><h3>
<a name="id612120"></a>
<a href="extension.html#fusion.extension.summary">Summary</a>
</h3>
<p>
We've now worked through the entire process for adding a new random access
sequence and we've also enabled our type to serve as an associative container.
The implementation was slightly longwinded, but followed a simple repeating
pattern.
</p>
<p>
The support for <tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></tt>, <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
sequences, and <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></tt> all use the same approach, and provide
additional examples of the approach for a variety of types.
</p>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="fusion.introduction"></a><a href="introduction.html" title="Introduction">Introduction</a></h2></div></div></div>
<p>
An advantage other languages such as Python and Lisp/ Scheme, ML and Haskell,
etc., over C++ is the ability to have heterogeneous containers that can hold
arbitrary element types. All the containers in the standard library can only
hold a specific type. A <tt class="computeroutput"><span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span></tt>
can only hold <tt class="computeroutput"><span class="keyword">int</span></tt>s. A <tt class="computeroutput"><span class="identifier">list</span><span class="special">&lt;</span><span class="identifier">X</span><span class="special">&gt;</span></tt> can
only hold elements of type <tt class="computeroutput"><span class="identifier">X</span></tt>,
and so on.
</p>
<p>
True, you can use inheritance to make the containers hold different types,
related through subclassing. However, you have to hold the objects through
a pointer or smart reference of some sort. Doing this, you'll have to rely
on virtual functions to provide polymorphic behavior since the actual type
is erased as soon as you store a pointer to a derived class to a pointer to
its base. The held objects must be related: you cannot hold objects of unrelated
types such as <tt class="computeroutput"><span class="keyword">char</span></tt>, <tt class="computeroutput"><span class="keyword">int</span></tt>, <tt class="computeroutput"><span class="keyword">class</span><EFBFBD><span class="identifier">X</span></tt>, <tt class="computeroutput"><span class="keyword">float</span></tt>,
etc. Oh sure you can use something like <a href="http://boost.org/doc/html/any.html" target="_top">Boost.Any</a>
to hold arbitrary types, but then you pay more in terms of runtime costs and
due to the fact that you practically erased all type information, you'll have
to perform dangerous casts to get back the original type.
</p>
<p>
The <a href="http://www.boost.org/libs/tuple/doc/tuple_users_guide.html" target="_top">Boost.Tuple</a>
library written by <a href="http://www.boost.org/people/jaakko_jarvi.htm" target="_top">Jaakko
Jarvi</a> provides heterogeneous containers in C++. The <tt class="computeroutput"><span class="identifier">tuple</span></tt>
is a basic data structure that can hold heterogeneous types. It's a good first
step, but it's not complete. What's missing are the algorithms. It's nice that
we can store and retrieve data to and from tuples, pass them around as arguments
and return types. As it is, the <a href="http://www.boost.org/libs/tuple/doc/tuple_users_guide.html" target="_top">Boost.Tuple</a>
facility is already very useful. Yet, as soon as you use it more often, usage
patterns emerge. Eventually, you collect these patterns into algorithm libraries.
</p>
<p>
Hmmm, kinda reminds us of STL right? Right! Can you imagine how it would be
like if you used STL without the algorithms? Everyone will have to reinvent
their own <span class="emphasis"><em>algorithm</em></span> wheels.
</p>
<p>
Fusion is a library and a framework similar to both <a href="http://en.wikipedia.org/wiki/Standard_Template_Library" target="_top">STL</a>
and the boost <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>.
The structure is modeled after <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>,
which is modeled after <a href="http://en.wikipedia.org/wiki/Standard_Template_Library" target="_top">STL</a>.
It is named "fusion" because the library is reminiscent of the "fusion"
of compile time meta-programming with runtime programming. The library inherently
has some interesting flavors and characteristics of both <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
and <a href="http://en.wikipedia.org/wiki/Standard_Template_Library" target="_top">STL</a>.
It lives in the twilight zone between compile time meta-programming and run
time programming. <a href="http://en.wikipedia.org/wiki/Standard_Template_Library" target="_top">STL</a>
containers work on values. MPL containers work on types. Fusion containers
work on both types and values.
</p>
<p>
Unlike <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>, Fusion
algorithms are lazy and non sequence-type preserving. What does that mean?
It means that when you operate on a sequence through a Fusion algorithm that
returns a sequence, the sequence returned may not be of the same class as the
original. This is by design. Runtime efficiency is given a high priority. Like
<a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>, and unlike
<a href="http://en.wikipedia.org/wiki/Standard_Template_Library" target="_top">STL</a>,
fusion algorithms are functional in nature such that algorithms are non mutating
(no side effects). However, due to the high cost of returning full sequences
such as vectors and lists, <span class="emphasis"><em>Views</em></span> are returned from Fusion
algorithms instead. For example, the <a href="algorithms/transformation/functions/transform.html" title="transform"><tt class="computeroutput"><span class="identifier">transform</span></tt></a> algorithm does not actually
return a transformed version of the original sequence. <a href="algorithms/transformation/functions/transform.html" title="transform"><tt class="computeroutput"><span class="identifier">transform</span></tt></a> returns a <a href="sequences/views/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a>. This view holds a
reference to the original sequence plus the transform function. Iteration over
the <a href="sequences/views/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a>
will apply the transform function over the sequence elements on demand. This
<span class="emphasis"><em>lazy</em></span> evaluation scheme allows us to chain as many algorithms
as we want without incurring a high runtime penalty.
</p>
<p>
The <span class="emphasis"><em>lazy</em></span> evaluation scheme where algorithms return views
allows operations such as <a href="algorithms/transformation/functions/push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">push_back</span></tt></a> to be totally generic. In
Fusion, <a href="algorithms/transformation/functions/push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">push_back</span></tt></a> is actually a generic algorithm
that works on all sequences. Given an input sequence <tt class="computeroutput"><span class="identifier">s</span></tt>
and a value <tt class="computeroutput"><span class="identifier">x</span></tt>, Fusion's <a href="algorithms/transformation/functions/push_back.html" title="push_back"><tt class="computeroutput"><span class="identifier">push_back</span></tt></a> algorithm simply returns
a <a href="sequences/views/joint_view.html" title="joint_view"><tt class="computeroutput"><span class="identifier">joint_view</span></tt></a>:
a view that holds a reference to the original sequence <tt class="computeroutput"><span class="identifier">s</span></tt>
and the value <tt class="computeroutput"><span class="identifier">x</span></tt>. Functions
that were once sequence specific and need to be implemented N times over N
different sequences are now implemented only once.
</p>
<p>
Fusion provides full round compatibility with <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>.
Fusion sequences are fully conforming <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
sequences and <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
sequences are fully compatible with Fusion. You can work with Fusion sequences
on <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a> if you
wish to work solely on types. In <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>,
Fusion sequences follow <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>'s
sequence-type preserving semantics (i.e. algorithms preserve the original sequence
type. e.g. transforming a vector returns a vector). You can also convert from
an <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a> sequence
to a Fusion sequence. For example, there are times when it is convenient to
work solely on <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
using pure <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
sequences, then, convert them to Fusion sequences as a final step before actual
instantiation of real runtime objects with data. You have the best of both
worlds.
</p>
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<a name="fusion.iterators"></a><a href="iterators.html" title="Iterators">Iterators</a></h2></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="iterators/concepts.html">Concepts</a></span></dt>
<dt><span class="section"><a href="iterators/functions.html">Functions</a></span></dt>
<dt><span class="section"><a href="iterators/operators.html">Operators</a></span></dt>
<dt><span class="section"><a href="iterators/metafunctions.html">Metafunctions</a></span></dt>
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<p>
Like <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a> and
<a href="http://en.wikipedia.org/wiki/Standard_Template_Library" target="_top">STL</a>,
iterators are a fundamental concept in Fusion. As with <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
and <a href="http://en.wikipedia.org/wiki/Standard_Template_Library" target="_top">STL</a>
iterators describe positions, and provide access to data within an underlying
<a href="sequences.html" title="Sequences">Sequence</a>.
</p>
<a name="fusion.iterators.header"></a><h3>
<a name="id456415"></a>
<a href="iterators.html#fusion.iterators.header">Header</a>
</h3>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
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<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.iterators.concepts"></a><a href="concepts.html" title="Concepts">Concepts</a></h3></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="concepts/forward_iterator.html">Forward
Iterator</a></span></dt>
<dt><span class="section"><a href="concepts/bidirectional_iterator.html">Bidirectional
Iterator</a></span></dt>
<dt><span class="section"><a href="concepts/random_access_iterator.html">Random
Access Iterator</a></span></dt>
</dl></div>
<p>
Fusion iterators are divided into different traversal categories. <a href="concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a> is the most basic concept. <a href="concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> is a refinement of <a href="concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>. <a href="concepts/random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a> is a refinement of <a href="concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>.
</p>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.concepts.bidirectional_iterator"></a><a href="bidirectional_iterator.html" title="Bidirectional
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<a name="fusion.iterators.concepts.bidirectional_iterator.description"></a><h5>
<a name="id459104"></a>
<a href="bidirectional_iterator.html#fusion.iterators.concepts.bidirectional_iterator.description">Description</a>
</h5>
<p>
A Bidirectional Iterator traverses a <a href="../../sequences.html" title="Sequences">Sequence</a>
allowing movement in either direction one element at a time.
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">i</span></tt></span></dt>
<dd>
A Bidirectional Iterator
</dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">I</span></tt></span></dt>
<dd>
A Bidirectional Iterator type
</dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">M</span></tt></span></dt>
<dd>
An <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
integral constant
</dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">N</span></tt></span></dt>
<dd>
An integral constant
</dd>
</dl>
</div>
<a name="fusion.iterators.concepts.bidirectional_iterator.refinement_of"></a><h5>
<a name="id459230"></a>
<a href="bidirectional_iterator.html#fusion.iterators.concepts.bidirectional_iterator.refinement_of">Refinement
of</a>
</h5>
<p>
<a href="forward_iterator.html" title="Forward
Iterator">Forward Iterator</a>
</p>
<a name="fusion.iterators.concepts.bidirectional_iterator.expression_requirements"></a><h5>
<a name="id459272"></a>
<a href="bidirectional_iterator.html#fusion.iterators.concepts.bidirectional_iterator.expression_requirements">Expression
requirements</a>
</h5>
<p>
In addition to the requirements defined in <a href="forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>, the following expressions must be valid:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Expression</th>
<th>Return type</th>
<th>Runtime
Complexity</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td><a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a></td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td><a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a></td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td><a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a></td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">M</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td><a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a></td>
<td>Constant</td>
</tr>
</tbody>
</table></div>
<a name="fusion.iterators.concepts.bidirectional_iterator.meta_expressions"></a><h5>
<a name="id459576"></a>
<a href="bidirectional_iterator.html#fusion.iterators.concepts.bidirectional_iterator.meta_expressions">Meta
Expressions</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>Expression</th>
<th>Compile Time Complexity</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><a href="../metafunctions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">prior</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Amortized constant
time</td>
</tr></tbody>
</table></div>
<a name="fusion.iterators.concepts.bidirectional_iterator.expression_semantics"></a><h5>
<a name="id459692"></a>
<a href="bidirectional_iterator.html#fusion.iterators.concepts.bidirectional_iterator.expression_semantics">Expression
Semantics</a>
</h5>
<p>
The semantics of an expression are defined only where they differ from,
or are not defined in <a href="forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>Expression</th>
<th>Semantics</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td>An
iterator to the element preceding <tt class="computeroutput"><span class="identifier">i</span></tt>
</td>
</tr></tbody>
</table></div>
<a name="fusion.iterators.concepts.bidirectional_iterator.invariants"></a><h5>
<a name="id459814"></a>
<a href="bidirectional_iterator.html#fusion.iterators.concepts.bidirectional_iterator.invariants">Invariants</a>
</h5>
<p>
In addition to the invariants of <a href="forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>, the following invariants always hold:
</p>
<div class="itemizedlist"><ul type="disc">
<li><tt class="computeroutput"><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">))</span><EFBFBD><span class="special">==</span><EFBFBD><span class="identifier">i</span><EFBFBD><span class="special">&amp;&amp;</span><EFBFBD><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">))</span><EFBFBD><span class="special">==</span><EFBFBD><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">))</span></tt></li>
<li><tt class="computeroutput"><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span><EFBFBD><span class="special">==</span><EFBFBD><a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;-</span><span class="number">1</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt></li>
<li>
Using <tt class="computeroutput"><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a></tt> to traverse a sequence
will never return a previously seen position
</li>
</ul></div>
<a name="fusion.iterators.concepts.bidirectional_iterator.models"></a><h5>
<a name="id460152"></a>
<a href="bidirectional_iterator.html#fusion.iterators.concepts.bidirectional_iterator.models">Models</a>
</h5>
<div class="itemizedlist"><ul type="disc">
<li>
<a href="../../sequences/adapted/std__pair.html" title="std::pair"><tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/adapted/boost__array.html" title="boost::array"><tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/views/iterator_range.html" title="iterator_range"><tt class="computeroutput"><span class="identifier">iterator_range</span></tt></a>
(where adapted sequence is a <a href="../../sequences/concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>)
</li>
<li>
<a href="../../sequences/views/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a>
(where adapted sequence is a <a href="../../sequences/concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>)
</li>
<li><a href="../../sequences/views/reverse_view.html" title="reverse_view"><tt class="computeroutput"><span class="identifier">reverse_view</span></tt></a></li>
</ul></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
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<title>Forward
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.concepts.forward_iterator"></a><a href="forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a></h4></div></div></div>
<a name="fusion.iterators.concepts.forward_iterator.description"></a><h5>
<a name="id456594"></a>
<a href="forward_iterator.html#fusion.iterators.concepts.forward_iterator.description">Description</a>
</h5>
<p>
A Forward Iterator traverses a <a href="../../sequences.html" title="Sequences">Sequence</a>
allowing movement in only one direction through it's elements, one element
at a time.
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">i</span></tt>,
<tt class="computeroutput"><span class="identifier">j</span></tt></span></dt>
<dd>
Forward Iterators
</dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">I</span></tt>,
<tt class="computeroutput"><span class="identifier">J</span></tt></span></dt>
<dd>
Forward Iterator types
</dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">M</span></tt></span></dt>
<dd>
An <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
integral constant
</dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">N</span></tt></span></dt>
<dd>
An integral constant
</dd>
</dl>
</div>
<a name="fusion.iterators.concepts.forward_iterator.expression_requirements"></a><h5>
<a name="id456742"></a>
<a href="forward_iterator.html#fusion.iterators.concepts.forward_iterator.expression_requirements">Expression
requirements</a>
</h5>
<p>
A type models Forward Iterator if, in addition to being CopyConstructable,
the following expressions are valid:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Expression</th>
<th>Return type</th>
<th>Runtime
Complexity</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td><a href="forward_iterator.html" title="Forward
Iterator">Forward Iterator</a></td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">i</span><EFBFBD><span class="special">==</span><EFBFBD><span class="identifier">j</span></tt></td>
<td>Convertible to
bool</td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">i</span><EFBFBD><span class="special">!=</span><EFBFBD><span class="identifier">j</span></tt></td>
<td>Convertible to
bool</td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td><a href="forward_iterator.html" title="Forward
Iterator">Forward Iterator</a></td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">M</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td><a href="forward_iterator.html" title="Forward
Iterator">Forward Iterator</a></td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">distance</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">,</span><EFBFBD><span class="identifier">j</span><span class="special">)</span></tt></td>
<td><tt class="computeroutput"><a href="../metafunctions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><EFBFBD><span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td><tt class="computeroutput"><a href="../metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="special">*</span><span class="identifier">i</span></tt></td>
<td><tt class="computeroutput"><a href="../metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Constant</td>
</tr>
</tbody>
</table></div>
<a name="fusion.iterators.concepts.forward_iterator.meta_expressions"></a><h5>
<a name="id457340"></a>
<a href="forward_iterator.html#fusion.iterators.concepts.forward_iterator.meta_expressions">Meta
Expressions</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>Expression</th>
<th>Compile Time Complexity</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><a href="../metafunctions/next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Amortized constant
time</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../metafunctions/equal_to.html" title="equal_to"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">equal_to</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><EFBFBD><span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Amortized constant
time</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../metafunctions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><EFBFBD><span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Linear</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../metafunctions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><EFBFBD><span class="special">,</span><span class="identifier">M</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Linear</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../metafunctions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><EFBFBD><span class="special">,</span><span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Linear</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Amortized constant
time</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../metafunctions/value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Amortized constant
time</td>
</tr>
</tbody>
</table></div>
<a name="fusion.iterators.concepts.forward_iterator.expression_semantics"></a><h5>
<a name="id457852"></a>
<a href="forward_iterator.html#fusion.iterators.concepts.forward_iterator.expression_semantics">Expression
Semantics</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>Expression</th>
<th>Semantics</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td>An
iterator to the element following <tt class="computeroutput"><span class="identifier">i</span></tt>
</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">i</span><EFBFBD><span class="special">==</span><EFBFBD><span class="identifier">j</span></tt></td>
<td>Iterator equality
comparison</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">i</span><EFBFBD><span class="special">!=</span><EFBFBD><span class="identifier">j</span></tt></td>
<td>Iterator inequality
comparison</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td>An
iterator n elements after <tt class="computeroutput"><span class="identifier">i</span></tt>
in the sequence</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">M</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td>Equivalent
to <tt class="computeroutput"><span class="identifier">advance_c</span><span class="special">&lt;</span><span class="identifier">M</span><span class="special">::</span><span class="identifier">value</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt>
</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">distance</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">,</span><EFBFBD><span class="identifier">j</span><span class="special">)</span></tt></td>
<td>The
number of elements between <tt class="computeroutput"><span class="identifier">i</span></tt>
and <tt class="computeroutput"><span class="identifier">j</span></tt>
</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td>The
element at position<tt class="computeroutput"><span class="identifier">i</span></tt>
</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="special">*</span><span class="identifier">i</span></tt></td>
<td>Equivalent
to <tt class="computeroutput"><span class="identifier">deref</span><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.iterators.concepts.forward_iterator.invariants"></a><h5>
<a name="id458347"></a>
<a href="forward_iterator.html#fusion.iterators.concepts.forward_iterator.invariants">Invariants</a>
</h5>
<p>
The following invariants always hold:
</p>
<div class="itemizedlist"><ul type="disc">
<li><tt class="computeroutput"><span class="special">!(</span><span class="identifier">i</span><EFBFBD><span class="special">==</span><EFBFBD><span class="identifier">j</span><span class="special">)</span><EFBFBD><span class="special">==</span><EFBFBD><span class="special">(</span><span class="identifier">i</span><EFBFBD><span class="special">!=</span><EFBFBD><span class="identifier">j</span><span class="special">)</span></tt></li>
<li><tt class="computeroutput"><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span><EFBFBD><span class="special">==</span><EFBFBD><a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt></li>
<li><tt class="computeroutput"><a href="../functions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">distance</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">,</span><EFBFBD><a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">))</span><EFBFBD><span class="special">==</span><EFBFBD><span class="identifier">N</span></tt></li>
<li>
Using <tt class="computeroutput"><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a></tt> to traverse the
sequence will never return to a previously seen position
</li>
<li>
<tt class="computeroutput"><a href="../functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>
is equivalent to <tt class="computeroutput"><span class="special">*</span><span class="identifier">i</span></tt>
</li>
<li>
If <tt class="computeroutput"><span class="identifier">i</span><EFBFBD><span class="special">==</span><EFBFBD><span class="identifier">j</span></tt> then <tt class="computeroutput"><span class="special">*</span><span class="identifier">i</span></tt> is equivalent to <tt class="computeroutput"><span class="special">*</span><span class="identifier">j</span></tt>
</li>
</ul></div>
<a name="fusion.iterators.concepts.forward_iterator.models"></a><h5>
<a name="id458763"></a>
<a href="forward_iterator.html#fusion.iterators.concepts.forward_iterator.models">Models</a>
</h5>
<div class="itemizedlist"><ul type="disc">
<li>
<a href="../../sequences/adapted/std__pair.html" title="std::pair"><tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/adapted/boost__array.html" title="boost::array"><tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/containers/cons.html" title="cons"><tt class="computeroutput"><span class="identifier">cons</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/containers/list.html" title="list"><tt class="computeroutput"><span class="identifier">list</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/containers/set.html" title="set"><tt class="computeroutput"><span class="identifier">set</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/containers/map.html" title="map"><tt class="computeroutput"><span class="identifier">map</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/views/single_view.html" title="single_view"><tt class="computeroutput"><span class="identifier">single_view</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/views/filter_view.html" title="filter_view"><tt class="computeroutput"><span class="identifier">filter_view</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/views/iterator_range.html" title="iterator_range"><tt class="computeroutput"><span class="identifier">iterator_range</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/views/joint_view.html" title="joint_view"><tt class="computeroutput"><span class="identifier">joint_view</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/views/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/views/reverse_view.html" title="reverse_view"><tt class="computeroutput"><span class="identifier">reverse_view</span></tt></a>
iterator
</li>
</ul></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Random
Access Iterator</title>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.concepts.random_access_iterator"></a><a href="random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a></h4></div></div></div>
<a name="fusion.iterators.concepts.random_access_iterator.description"></a><h5>
<a name="id460364"></a>
<a href="random_access_iterator.html#fusion.iterators.concepts.random_access_iterator.description">Description</a>
</h5>
<p>
A Random Access Iterator traverses a <a href="../../sequences.html" title="Sequences">Sequence</a>
moving in either direction, permitting efficient arbitrary distance movements
back and forward through the sequence.
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">i</span></tt>,
<tt class="computeroutput"><span class="identifier">j</span></tt></span></dt>
<dd>
Random Access Iterators
</dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">I</span></tt>,
<tt class="computeroutput"><span class="identifier">J</span></tt></span></dt>
<dd>
Random Access Iterator types
</dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">M</span></tt></span></dt>
<dd>
An <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
integral constant
</dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">N</span></tt></span></dt>
<dd>
An integral constant
</dd>
</dl>
</div>
<a name="fusion.iterators.concepts.random_access_iterator.refinement_of"></a><h5>
<a name="id460512"></a>
<a href="random_access_iterator.html#fusion.iterators.concepts.random_access_iterator.refinement_of">Refinement
of</a>
</h5>
<p>
<a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>
</p>
<a name="fusion.iterators.concepts.random_access_iterator.expression_requirements"></a><h5>
<a name="id460553"></a>
<a href="random_access_iterator.html#fusion.iterators.concepts.random_access_iterator.expression_requirements">Expression
requirements</a>
</h5>
<p>
In addition to the requirements defined in <a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>, the following expressions must be valid:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Expression</th>
<th>Return type</th>
<th>Runtime
Complexity</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td><a href="random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a></td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td><a href="random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a></td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td><a href="random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a></td>
<td>Constant</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../functions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">M</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt></td>
<td><a href="random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a></td>
<td>Constant</td>
</tr>
</tbody>
</table></div>
<a name="fusion.iterators.concepts.random_access_iterator.meta_expressions"></a><h5>
<a name="id460854"></a>
<a href="random_access_iterator.html#fusion.iterators.concepts.random_access_iterator.meta_expressions">Meta
Expressions</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>Expression</th>
<th>Compile Time Complexity</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><a href="../metafunctions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><EFBFBD><span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Amortized constant
time</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../metafunctions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><EFBFBD><span class="identifier">M</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Amortized constant
time</td>
</tr>
<tr>
<td><tt class="computeroutput"><a href="../metafunctions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><EFBFBD><span class="special">,</span><span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">type</span></tt></td>
<td>Amortized constant
time</td>
</tr>
</tbody>
</table></div>
<a name="fusion.iterators.concepts.random_access_iterator.models"></a><h5>
<a name="id461116"></a>
<a href="random_access_iterator.html#fusion.iterators.concepts.random_access_iterator.models">Models</a>
</h5>
<div class="itemizedlist"><ul type="disc">
<li>
<a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/adapted/std__pair.html" title="std::pair"><tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/adapted/boost__array.html" title="boost::array"><tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></tt></a>
iterator
</li>
<li>
<a href="../../sequences/views/iterator_range.html" title="iterator_range"><tt class="computeroutput"><span class="identifier">iterator_range</span></tt></a>
iterator (where adapted sequence is a <a href="../../sequences/concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a>)
</li>
<li>
<a href="../../sequences/views/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a>
iterator (where adapted sequence is a <a href="../../sequences/concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a>)
</li>
<li>
<a href="../../sequences/views/reverse_view.html" title="reverse_view"><tt class="computeroutput"><span class="identifier">reverse_view</span></tt></a>
iterator (where adapted sequence is a <a href="../../sequences/concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a>)
</li>
</ul></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.iterators.functions"></a><a href="functions.html" title="Functions">Functions</a></h3></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="functions/deref.html">deref</a></span></dt>
<dt><span class="section"><a href="functions/next.html">next</a></span></dt>
<dt><span class="section"><a href="functions/prior.html">prior</a></span></dt>
<dt><span class="section"><a href="functions/distance.html">distance</a></span></dt>
<dt><span class="section"><a href="functions/advance.html">advance</a></span></dt>
<dt><span class="section"><a href="functions/advance_c.html">advance_c</a></span></dt>
</dl></div>
<p>
Fusion provides functions for manipulating iterators, analogous to the similar
functions from the <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
library.
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.functions.advance"></a><a href="advance.html" title="advance">advance</a></h4></div></div></div>
<a name="fusion.iterators.functions.advance.description"></a><h5>
<a name="id464834"></a>
<a href="advance.html#fusion.iterators.functions.advance.description">Description</a>
</h5>
<p>
Moves an iterator by a specified distance.
</p>
<a name="fusion.iterators.functions.advance.synopsis"></a><h5>
<a name="id464863"></a>
<a href="advance.html#fusion.iterators.functions.advance.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">M</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">M</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">advance</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id465035"></a><p class="title"><b>Table<EFBFBD>1.6.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">i</span></tt></td>
<td>Model
of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Iterator to move relative to</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">N</span></tt></td>
<td>An
MPL Integral Constant</td>
<td>Number of positions to move</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.iterators.functions.advance.expression_semantics"></a><h5>
<a name="id465128"></a>
<a href="advance.html#fusion.iterators.functions.advance.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">M</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
element <tt class="computeroutput"><span class="identifier">M</span></tt> positions from
<tt class="computeroutput"><span class="identifier">i</span></tt>. If <tt class="computeroutput"><span class="identifier">i</span></tt>
is a <a href="../concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> then <tt class="computeroutput"><span class="identifier">M</span></tt>
may be negative.
</p>
<a name="fusion.iterators.functions.advance.header"></a><h5>
<a name="id465284"></a>
<a href="advance.html#fusion.iterators.functions.advance.header">Header</a>
</h5>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">advance</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterators.functions.advance.example"></a><h5>
<a name="id465379"></a>
<a href="advance.html#fusion.iterators.functions.advance.example">Example</a>
</h5>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">vec</span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special">&lt;</span><span class="number">2</span><span class="special">&gt;</span> <span class="special">&gt;(</span><a href="../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">)))</span> <span class="special">==</span> <span class="number">3</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
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<a accesskey="p" href="distance.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="advance_c.html"><img src="../../../images/next.png" alt="Next"></a>
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@ -1,126 +0,0 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>advance_c</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.functions.advance_c"></a><a href="advance_c.html" title="advance_c">advance_c</a></h4></div></div></div>
<a name="fusion.iterators.functions.advance_c.description"></a><h5>
<a name="id465675"></a>
<a href="advance_c.html#fusion.iterators.functions.advance_c.description">Description</a>
</h5>
<p>
Moves an iterator by a specified distance.
</p>
<a name="fusion.iterators.functions.advance_c.synopsis"></a><h5>
<a name="id465707"></a>
<a href="advance_c.html#fusion.iterators.functions.advance_c.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">int</span> <span class="identifier">N</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">advance_c</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id465879"></a><p class="title"><b>Table<EFBFBD>1.7.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">i</span></tt></td>
<td>Model
of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Iterator to move relative to</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">N</span></tt></td>
<td>Integer
constant</td>
<td>Number of positions to move</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.iterators.functions.advance_c.expression_semantics"></a><h5>
<a name="id465973"></a>
<a href="advance_c.html#fusion.iterators.functions.advance_c.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
element <tt class="computeroutput"><span class="identifier">N</span></tt> positions from
<tt class="computeroutput"><span class="identifier">i</span></tt>. If <tt class="computeroutput"><span class="identifier">i</span></tt>
is a <a href="../concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> then <tt class="computeroutput"><span class="identifier">N</span></tt>
may be negative.
</p>
<a name="fusion.iterators.functions.advance_c.header"></a><h5>
<a name="id466130"></a>
<a href="advance_c.html#fusion.iterators.functions.advance_c.header">Header</a>
</h5>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">advance</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterators.functions.advance_c.example"></a><h5>
<a name="id466224"></a>
<a href="advance_c.html#fusion.iterators.functions.advance_c.example">Example</a>
</h5>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">vec</span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="number">2</span><span class="special">&gt;(</span><a href="../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">)))</span> <span class="special">==</span> <span class="number">3</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="advance.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../operators.html"><img src="../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>deref</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.functions.deref"></a><a href="deref.html" title="deref">deref</a></h4></div></div></div>
<a name="fusion.iterators.functions.deref.description"></a><h5>
<a name="id461373"></a>
<a href="deref.html#fusion.iterators.functions.deref.description">Description</a>
</h5>
<p>
Deferences an iterator.
</p>
<a name="fusion.iterators.functions.deref.synopsis"></a><h5>
<a name="id461402"></a>
<a href="deref.html#fusion.iterators.functions.deref.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">deref</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id461546"></a><p class="title"><b>Table<EFBFBD>1.2.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">i</span></tt></td>
<td>Model
of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterators.functions.deref.expression_semantics"></a><h5>
<a name="id461619"></a>
<a href="deref.html#fusion.iterators.functions.deref.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><a href="../metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Dereferences the iterator
<tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<a name="fusion.iterators.functions.deref.header"></a><h5>
<a name="id461762"></a>
<a href="deref.html#fusion.iterators.functions.deref.header">Header</a>
</h5>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">deref</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterators.functions.deref.example"></a><h5>
<a name="id461856"></a>
<a href="deref.html#fusion.iterators.functions.deref.example">Example</a>
</h5>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&amp;&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">int</span> <span class="identifier">i</span><span class="special">(</span><span class="number">0</span><span class="special">);</span>
<span class="identifier">vec</span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="identifier">i</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">))</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">)))</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(&amp;(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">))))</span> <span class="special">==</span> <span class="special">&amp;</span><span class="identifier">i</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="../functions.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="next.html"><img src="../../../images/next.png" alt="Next"></a>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>distance</title>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.functions.distance"></a><a href="distance.html" title="distance">distance</a></h4></div></div></div>
<a name="fusion.iterators.functions.distance.description"></a><h5>
<a name="id463992"></a>
<a href="distance.html#fusion.iterators.functions.distance.description">Description</a>
</h5>
<p>
Returns the distance between 2 iterators.
</p>
<a name="fusion.iterators.functions.distance.synopsis"></a><h5>
<a name="id464021"></a>
<a href="distance.html#fusion.iterators.functions.distance.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">J</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">distance</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">J</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">j</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id464221"></a><p class="title"><b>Table<EFBFBD>1.5.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td>
<tt class="computeroutput"><span class="identifier">i</span></tt>, <tt class="computeroutput"><span class="identifier">j</span></tt>
</td>
<td>Models of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a> into the same sequence</td>
<td>The start and
end points of the distance to be measured</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterators.functions.distance.expression_semantics"></a><h5>
<a name="id464305"></a>
<a href="distance.html#fusion.iterators.functions.distance.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="distance.html" title="distance"><tt class="computeroutput"><span class="identifier">distance</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">,</span><span class="identifier">j</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">int</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the distance between
iterators <tt class="computeroutput"><span class="identifier">i</span></tt> and <tt class="computeroutput"><span class="identifier">j</span></tt>.
</p>
<a name="fusion.iterators.functions.distance.header"></a><h5>
<a name="id464429"></a>
<a href="distance.html#fusion.iterators.functions.distance.header">Header</a>
</h5>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">distance</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterators.functions.distance.example"></a><h5>
<a name="id464524"></a>
<a href="distance.html#fusion.iterators.functions.distance.example">Example</a>
</h5>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">vec</span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="distance.html" title="distance"><tt class="computeroutput"><span class="identifier">distance</span></tt></a><span class="special">(</span><a href="../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">),</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">))))</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
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<a accesskey="p" href="prior.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="advance.html"><img src="../../../images/next.png" alt="Next"></a>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.functions.next"></a><a href="next.html" title="next">next</a></h4></div></div></div>
<a name="fusion.iterators.functions.next.description"></a><h5>
<a name="id462303"></a>
<a href="next.html#fusion.iterators.functions.next.description">Description</a>
</h5>
<p>
Moves an iterator 1 position forwards.
</p>
<a name="fusion.iterators.functions.next.synopsis"></a><h5>
<a name="id462333"></a>
<a href="next.html#fusion.iterators.functions.next.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">next</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id462477"></a><p class="title"><b>Table<EFBFBD>1.3.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">i</span></tt></td>
<td>Model
of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterators.functions.next.expression_semantics"></a><h5>
<a name="id462549"></a>
<a href="next.html#fusion.iterators.functions.next.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<span class="identifier">next</span><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
next element after <tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<a name="fusion.iterators.functions.next.header"></a><h5>
<a name="id462642"></a>
<a href="next.html#fusion.iterators.functions.next.header">Header</a>
</h5>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">next</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterators.functions.next.example"></a><h5>
<a name="id462736"></a>
<a href="next.html#fusion.iterators.functions.next.example">Example</a>
</h5>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">vec</span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">))</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">)))</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">))))</span> <span class="special">==</span> <span class="number">3</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.functions.prior"></a><a href="prior.html" title="prior">prior</a></h4></div></div></div>
<a name="fusion.iterators.functions.prior.description"></a><h5>
<a name="id463190"></a>
<a href="prior.html#fusion.iterators.functions.prior.description">Description</a>
</h5>
<p>
Moves an iterator 1 position backwards.
</p>
<a name="fusion.iterators.functions.prior.synopsis"></a><h5>
<a name="id463220"></a>
<a href="prior.html#fusion.iterators.functions.prior.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">prior</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">prior</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id463363"></a><p class="title"><b>Table<EFBFBD>1.4.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">i</span></tt></td>
<td>Model
of <a href="../concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>
</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterators.functions.prior.expression_semantics"></a><h5>
<a name="id463437"></a>
<a href="prior.html#fusion.iterators.functions.prior.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
element prior to <tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<a name="fusion.iterators.functions.prior.header"></a><h5>
<a name="id463541"></a>
<a href="prior.html#fusion.iterators.functions.prior.header">Header</a>
</h5>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">prior</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterators.functions.prior.example"></a><h5>
<a name="id463635"></a>
<a href="prior.html#fusion.iterators.functions.prior.example">Example</a>
</h5>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">vec</span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">)))</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequences/intrinsics/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">))))</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
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<a accesskey="p" href="distance.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="advance_c.html"><img src="../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.metafunctions.advance"></a><a href="advance.html" title="advance">advance</a></h4></div></div></div>
<a name="fusion.iterators.metafunctions.advance.description"></a><h5>
<a name="id473888"></a>
<a href="advance.html#fusion.iterators.metafunctions.advance.description">Description</a>
</h5>
<p>
Moves an iterator a specified distance.
</p>
<a name="fusion.iterators.metafunctions.advance.synopsis"></a><h5>
<a name="id473919"></a>
<a href="advance.html#fusion.iterators.metafunctions.advance.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">M</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">advance</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id474035"></a><p class="title"><b>Table<EFBFBD>1.17.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">I</span></tt></td>
<td>Model
of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Iterator to move relative to</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">M</span></tt></td>
<td>Model
of MPL Integral Constant</td>
<td>Number of positions to move</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.iterators.metafunctions.advance.expression_semantics"></a><h5>
<a name="id474129"></a>
<a href="advance.html#fusion.iterators.metafunctions.advance.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="advance.html" title="advance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><span class="identifier">M</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator a distance
<tt class="computeroutput"><span class="identifier">M</span></tt> from <tt class="computeroutput"><span class="identifier">I</span></tt>.
If <tt class="computeroutput"><span class="identifier">I</span></tt> is a <a href="../concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> then <tt class="computeroutput"><span class="identifier">M</span></tt>
may be negative.
</p>
<a name="fusion.iterators.metafunctions.advance.header"></a><h5>
<a name="id474299"></a>
<a href="advance.html#fusion.iterators.metafunctions.advance.header">Header</a>
</h5>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">advance</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterators.metafunctions.advance.example"></a><h5>
<a name="id474393"></a>
<a href="advance.html#fusion.iterators.metafunctions.advance.example">Example</a>
</h5>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">double</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequences/intrinsics/metafunctions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">second</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">third</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="equal_to.html" title="equal_to"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">equal_to</span></tt></a><span class="special">&lt;</span><a href="advance.html" title="advance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special">&lt;</span><span class="number">2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">third</span><span class="special">&gt;));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="distance.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="advance_c.html"><img src="../../../images/next.png" alt="Next"></a>
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@ -1,130 +0,0 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>advance_c</title>
<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.metafunctions.advance_c"></a><a href="advance_c.html" title="advance_c">advance_c</a></h4></div></div></div>
<a name="fusion.iterators.metafunctions.advance_c.description"></a><h5>
<a name="id474854"></a>
<a href="advance_c.html#fusion.iterators.metafunctions.advance_c.description">Description</a>
</h5>
<p>
Moves an iterator by a specified distance.
</p>
<a name="fusion.iterators.metafunctions.advance_c.synopsis"></a><h5>
<a name="id474885"></a>
<a href="advance_c.html#fusion.iterators.metafunctions.advance_c.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">int</span> <span class="identifier">N</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">advance_c</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id475002"></a><p class="title"><b>Table<EFBFBD>1.18.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">I</span></tt></td>
<td>Model
of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Iterator to move relative to</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">N</span></tt></td>
<td>Integer
constant</td>
<td>Number of positions to move</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.iterators.metafunctions.advance_c.expression_semantics"></a><h5>
<a name="id475096"></a>
<a href="advance_c.html#fusion.iterators.metafunctions.advance_c.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator a distance
<tt class="computeroutput"><span class="identifier">N</span></tt> from <tt class="computeroutput"><span class="identifier">I</span></tt>.
If <tt class="computeroutput"><span class="identifier">I</span></tt> is a <a href="../concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> then <tt class="computeroutput"><span class="identifier">N</span></tt>
may be negative. Equivalent to <tt class="computeroutput"><a href="advance.html" title="advance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span><EFBFBD><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;</span><EFBFBD><span class="special">&gt;::</span><span class="identifier">type</span></tt>.
</p>
<a name="fusion.iterators.metafunctions.advance_c.header"></a><h5>
<a name="id475367"></a>
<a href="advance_c.html#fusion.iterators.metafunctions.advance_c.header">Header</a>
</h5>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">advance</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterators.metafunctions.advance_c.example"></a><h5>
<a name="id475461"></a>
<a href="advance_c.html#fusion.iterators.metafunctions.advance_c.example">Example</a>
</h5>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">double</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequences/intrinsics/metafunctions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">second</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">third</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="equal_to.html" title="equal_to"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">equal_to</span></tt></a><span class="special">&lt;</span><a href="advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">,</span> <span class="number">2</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">third</span><span class="special">&gt;));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="advance.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../sequences.html"><img src="../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>deref</title>
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<a accesskey="p" href="value_of.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="next.html"><img src="../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.metafunctions.deref"></a><a href="deref.html" title="deref">deref</a></h4></div></div></div>
<a name="fusion.iterators.metafunctions.deref.description"></a><h5>
<a name="id469508"></a>
<a href="deref.html#fusion.iterators.metafunctions.deref.description">Description</a>
</h5>
<p>
Returns the type that will be returned by dereferencing an iterator.
</p>
<a name="fusion.iterators.metafunctions.deref.synposis"></a><h5>
<a name="id469540"></a>
<a href="deref.html#fusion.iterators.metafunctions.deref.synposis">Synposis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">deref</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id469638"></a><p class="title"><b>Table<EFBFBD>1.12.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">I</span></tt></td>
<td>Model
of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterators.metafunctions.deref.expression_semantics"></a><h5>
<a name="id469711"></a>
<a href="deref.html#fusion.iterators.metafunctions.deref.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the result of dereferencing
an iterator of type <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<a name="fusion.iterators.metafunctions.deref.header"></a><h5>
<a name="id469822"></a>
<a href="deref.html#fusion.iterators.metafunctions.deref.header">Header</a>
</h5>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">deref</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterators.metafunctions.deref.example"></a><h5>
<a name="id469917"></a>
<a href="deref.html#fusion.iterators.metafunctions.deref.example">Example</a>
</h5>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&amp;&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">vec</span> <span class="identifier">const_vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequences/intrinsics/metafunctions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequences/intrinsics/metafunctions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">const_vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">const_first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">const_first</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">const_second</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&amp;&gt;));</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><span class="identifier">second</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&amp;&gt;));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="value_of.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="next.html"><img src="../../../images/next.png" alt="Next"></a>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>distance</title>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.metafunctions.distance"></a><a href="distance.html" title="distance">distance</a></h4></div></div></div>
<a name="fusion.iterators.metafunctions.distance.description"></a><h5>
<a name="id472993"></a>
<a href="distance.html#fusion.iterators.metafunctions.distance.description">Description</a>
</h5>
<p>
Returns the distance between two iterators.
</p>
<a name="fusion.iterators.metafunctions.distance.synopsis"></a><h5>
<a name="id473024"></a>
<a href="distance.html#fusion.iterators.metafunctions.distance.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">J</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">distance</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id473142"></a><p class="title"><b>Table<EFBFBD>1.16.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td>
<tt class="computeroutput"><span class="identifier">I</span></tt>, <tt class="computeroutput"><span class="identifier">J</span></tt>
</td>
<td>Models of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a> into the same sequence</td>
<td>The start and
end points of the distance to be measured</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterators.metafunctions.distance.expression_semantics"></a><h5>
<a name="id473229"></a>
<a href="distance.html#fusion.iterators.metafunctions.distance.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="distance.html" title="distance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of MPL Integral Constant.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the distance between
iterators of types <tt class="computeroutput"><span class="identifier">I</span></tt> and
<tt class="computeroutput"><span class="identifier">J</span></tt>.
</p>
<a name="fusion.iterators.metafunctions.distance.header"></a><h5>
<a name="id473362"></a>
<a href="distance.html#fusion.iterators.metafunctions.distance.header">Header</a>
</h5>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">distance</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterators.metafunctions.distance.example"></a><h5>
<a name="id473456"></a>
<a href="distance.html#fusion.iterators.metafunctions.distance.example">Example</a>
</h5>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">double</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequences/intrinsics/metafunctions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">second</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">third</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="distance.html" title="distance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">,</span><span class="identifier">third</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">dist</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT_RELATION</span><span class="special">(</span><span class="identifier">dist</span><span class="special">::</span><span class="identifier">value</span><span class="special">,</span> <span class="special">==,</span> <span class="number">2</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="equal_to.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="advance.html"><img src="../../../images/next.png" alt="Next"></a>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.metafunctions.equal_to"></a><a href="equal_to.html" title="equal_to">equal_to</a></h4></div></div></div>
<a name="fusion.iterators.metafunctions.equal_to.description"></a><h5>
<a name="id472100"></a>
<a href="equal_to.html#fusion.iterators.metafunctions.equal_to.description">Description</a>
</h5>
<p>
Returns a true-valued MPL Integral Constant if <tt class="computeroutput"><span class="identifier">I</span></tt>
and <tt class="computeroutput"><span class="identifier">J</span></tt> are equal.
</p>
<a name="fusion.iterators.metafunctions.equal_to.synopsis"></a><h5>
<a name="id472151"></a>
<a href="equal_to.html#fusion.iterators.metafunctions.equal_to.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">J</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">equal_to</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id472269"></a><p class="title"><b>Table<EFBFBD>1.15.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td>
<tt class="computeroutput"><span class="identifier">I</span></tt>, <tt class="computeroutput"><span class="identifier">J</span></tt>
</td>
<td>Any fusion iterators</td>
<td>Operation's
arguments</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterators.metafunctions.equal_to.expression_semantics"></a><h5>
<a name="id472343"></a>
<a href="equal_to.html#fusion.iterators.metafunctions.equal_to.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="equal_to.html" title="equal_to"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">equal_to</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of MPL Integral Constant.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>
if <tt class="computeroutput"><span class="identifier">I</span></tt> and <tt class="computeroutput"><span class="identifier">J</span></tt> are iterators to the same position.
Returns <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></tt> otherwise.
</p>
<a name="fusion.iterators.metafunctions.equal_to.header"></a><h5>
<a name="id472536"></a>
<a href="equal_to.html#fusion.iterators.metafunctions.equal_to.header">Header</a>
</h5>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">equal_to</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterators.metafunctions.equal_to.example"></a><h5>
<a name="id472630"></a>
<a href="equal_to.html#fusion.iterators.metafunctions.equal_to.example">Example</a>
</h5>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequences/intrinsics/metafunctions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequences/intrinsics/metafunctions/end.html" title="end"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">end</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">last</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="equal_to.html" title="equal_to"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">equal_to</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">first</span><span class="special">&gt;));</span>
<span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span><a href="equal_to.html" title="equal_to"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">equal_to</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">,</span><span class="identifier">last</span><span class="special">&gt;));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="prior.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="distance.html"><img src="../../../images/next.png" alt="Next"></a>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterators.metafunctions.next"></a><a href="next.html" title="next">next</a></h4></div></div></div>
<a name="fusion.iterators.metafunctions.next.description"></a><h5>
<a name="id470497"></a>
<a href="next.html#fusion.iterators.metafunctions.next.description">Description</a>
</h5>
<p>
Returns the type of the next iterator in a sequence.
</p>
<a name="fusion.iterators.metafunctions.next.synposis"></a><h5>
<a name="id470527"></a>
<a href="next.html#fusion.iterators.metafunctions.next.synposis">Synposis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">next</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id470626"></a><p class="title"><b>Table<EFBFBD>1.13.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">I</span></tt></td>
<td>Model
of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</td>
<td>Operation's argument</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterators.metafunctions.next.expression_semantics"></a><h5>
<a name="id470698"></a>
<a href="next.html#fusion.iterators.metafunctions.next.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
next element in the sequence after <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<a name="fusion.iterators.metafunctions.next.header"></a><h5>
<a name="id470819"></a>
<a href="next.html#fusion.iterators.metafunctions.next.header">Header</a>
</h5>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">next</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterators.metafunctions.next.example"></a><h5>
<a name="id470913"></a>
<a href="next.html#fusion.iterators.metafunctions.next.example">Example</a>
</h5>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><a href="../../sequences/intrinsics/metafunctions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">second</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">double</span><span class="special">&gt;));</span>
</pre>
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