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boost-1.52
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@ -1,159 +0,0 @@
|
||||
#ifndef BOOST_ITERATOR_CATEGORIES_HPP
|
||||
#define BOOST_ITERATOR_CATEGORIES_HPP
|
||||
|
||||
#include <boost/config.hpp>
|
||||
#include <boost/type_traits/conversion_traits.hpp>
|
||||
#include <boost/type_traits/cv_traits.hpp>
|
||||
#include <boost/pending/ct_if.hpp>
|
||||
#include <boost/detail/iterator.hpp>
|
||||
|
||||
namespace boost {
|
||||
|
||||
// Return Type Categories
|
||||
struct readable_iterator_tag { };
|
||||
struct writable_iterator_tag { };
|
||||
struct swappable_iterator_tag { };
|
||||
struct mutable_lvalue_iterator_tag :
|
||||
virtual public writable_iterator_tag,
|
||||
virtual public readable_iterator_tag { };
|
||||
struct constant_lvalue_iterator_tag :
|
||||
virtual public readable_iterator_tag { };
|
||||
|
||||
// Traversal Categories
|
||||
struct forward_traversal_tag { };
|
||||
struct bidirectional_traversal_tag : public forward_traversal_tag { };
|
||||
struct random_access_traversal_tag : public bidirectional_traversal_tag { };
|
||||
|
||||
struct error_iterator_tag { };
|
||||
|
||||
// Inherit from iterator_base if your iterator defines its own
|
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// return_category and traversal_category. Otherwise, the "old style"
|
||||
// iterator category will be mapped to the return_category and
|
||||
// traversal_category.
|
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struct new_iterator_base { };
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|
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namespace detail {
|
||||
|
||||
struct return_category_from_nested_type {
|
||||
template <typename Iterator> struct bind {
|
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typedef typename Iterator::return_category type;
|
||||
};
|
||||
};
|
||||
|
||||
struct traversal_category_from_nested_type {
|
||||
template <typename Iterator> struct bind {
|
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typedef typename Iterator::traversal_category type;
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||||
};
|
||||
};
|
||||
|
||||
template <typename ValueType>
|
||||
struct choose_lvalue_return {
|
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typedef typename ct_if<is_const<ValueType>::value,
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boost::constant_lvalue_iterator_tag,
|
||||
boost::mutable_lvalue_iterator_tag>::type type;
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||||
};
|
||||
|
||||
|
||||
template <typename Category, typename ValueType>
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struct iter_category_to_return {
|
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typedef typename ct_if<
|
||||
is_convertible<Category*, std::forward_iterator_tag*>::value,
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||||
typename choose_lvalue_return<ValueType>::type,
|
||||
typename ct_if<
|
||||
is_convertible<Category*, std::input_iterator_tag*>::value,
|
||||
boost::readable_iterator_tag,
|
||||
typename ct_if<
|
||||
is_convertible<Category*, std::output_iterator_tag*>::value,
|
||||
boost::writable_iterator_tag,
|
||||
boost::error_iterator_tag
|
||||
>::type
|
||||
>::type
|
||||
>::type type;
|
||||
};
|
||||
|
||||
template <typename Category>
|
||||
struct iter_category_to_traversal {
|
||||
typedef typename ct_if<
|
||||
is_convertible<Category*, std::random_access_iterator_tag*>::value,
|
||||
random_access_traversal_tag,
|
||||
typename ct_if<
|
||||
is_convertible<Category*, std::bidirectional_iterator_tag*>::value,
|
||||
bidirectional_traversal_tag,
|
||||
forward_traversal_tag
|
||||
>::type
|
||||
>::type type;
|
||||
};
|
||||
|
||||
struct return_category_from_old_traits {
|
||||
template <typename Iterator> class bind {
|
||||
typedef boost::detail::iterator_traits<Iterator> OldTraits;
|
||||
typedef typename OldTraits::iterator_category Cat;
|
||||
typedef typename OldTraits::value_type value_type;
|
||||
public:
|
||||
typedef iter_category_to_return<Cat, value_type>::type type;
|
||||
};
|
||||
};
|
||||
|
||||
struct traversal_category_from_old_traits {
|
||||
template <typename Iterator> class bind {
|
||||
typedef boost::detail::iterator_traits<Iterator> OldTraits;
|
||||
typedef typename OldTraits::iterator_category Cat;
|
||||
public:
|
||||
typedef iter_category_to_traversal<Cat>::type type;
|
||||
};
|
||||
};
|
||||
|
||||
template <typename Iterator>
|
||||
class choose_return_category {
|
||||
typedef typename ct_if<is_convertible<Iterator*,
|
||||
new_iterator_base*>::value,
|
||||
return_category_from_nested_type,
|
||||
return_category_from_old_traits>::type Choice;
|
||||
public:
|
||||
typedef typename Choice:: template bind<Iterator>::type type;
|
||||
};
|
||||
|
||||
template <typename Iterator>
|
||||
class choose_traversal_category {
|
||||
typedef typename ct_if<is_convertible<Iterator*,
|
||||
new_iterator_base*>::value,
|
||||
traversal_category_from_nested_type,
|
||||
traversal_category_from_old_traits>::type Choice;
|
||||
public:
|
||||
typedef typename Choice:: template bind<Iterator>::type type;
|
||||
};
|
||||
|
||||
} // namespace detail
|
||||
|
||||
template <class Iterator>
|
||||
struct return_category {
|
||||
typedef typename detail::choose_return_category<Iterator>::type type;
|
||||
};
|
||||
|
||||
|
||||
template <class Iterator>
|
||||
struct traversal_category {
|
||||
typedef typename detail::choose_traversal_category<Iterator>::type type;
|
||||
};
|
||||
|
||||
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
|
||||
|
||||
template <typename T>
|
||||
struct return_category<T*>
|
||||
{
|
||||
typedef typename ct_if<is_const<T>::value,
|
||||
constant_lvalue_iterator_tag,
|
||||
mutable_lvalue_iterator_tag>::type type;
|
||||
};
|
||||
|
||||
template <typename T>
|
||||
struct traversal_category<T*>
|
||||
{
|
||||
typedef random_access_traversal_tag type;
|
||||
};
|
||||
|
||||
#endif
|
||||
|
||||
} // namespace boost
|
||||
|
||||
#endif // BOOST_ITERATOR_CATEGORIES_HPP
|
@ -1,172 +0,0 @@
|
||||
#ifndef BOOST_ITERATOR_CONCEPTS_HPP
|
||||
#define BOOST_ITERATOR_CONCEPTS_HPP
|
||||
|
||||
#include <boost/concept_check.hpp>
|
||||
#include <boost/iterator_categories.hpp>
|
||||
#include <boost/type_traits/conversion_traits.hpp>
|
||||
#include <boost/static_assert.hpp>
|
||||
|
||||
namespace boost_concepts {
|
||||
// Used a different namespace here (instead of "boost") so that the
|
||||
// concept descriptions do not take for granted the names in
|
||||
// namespace boost.
|
||||
|
||||
|
||||
//===========================================================================
|
||||
// Iterator Access Concepts
|
||||
|
||||
template <typename Iterator>
|
||||
class ReadableIteratorConcept {
|
||||
public:
|
||||
typedef typename std::iterator_traits<Iterator>::value_type value_type;
|
||||
typedef typename std::iterator_traits<Iterator>::reference reference;
|
||||
typedef typename boost::return_category<Iterator>::type return_category;
|
||||
|
||||
void constraints() {
|
||||
boost::function_requires< boost::SGIAssignableConcept<Iterator> >();
|
||||
boost::function_requires< boost::EqualityComparableConcept<Iterator> >();
|
||||
boost::function_requires<
|
||||
boost::DefaultConstructibleConcept<Iterator> >();
|
||||
|
||||
BOOST_STATIC_ASSERT((boost::is_convertible<return_category*,
|
||||
boost::readable_iterator_tag*>::value));
|
||||
|
||||
reference r = *i; // or perhaps read(x)
|
||||
value_type v(r);
|
||||
boost::ignore_unused_variable_warning(v);
|
||||
}
|
||||
Iterator i;
|
||||
};
|
||||
|
||||
template <typename Iterator, typename ValueType>
|
||||
class WritableIteratorConcept {
|
||||
public:
|
||||
typedef typename boost::return_category<Iterator>::type return_category;
|
||||
|
||||
void constraints() {
|
||||
boost::function_requires< boost::SGIAssignableConcept<Iterator> >();
|
||||
boost::function_requires< boost::EqualityComparableConcept<Iterator> >();
|
||||
boost::function_requires<
|
||||
boost::DefaultConstructibleConcept<Iterator> >();
|
||||
|
||||
BOOST_STATIC_ASSERT((boost::is_convertible<return_category*,
|
||||
boost::writable_iterator_tag*>::value));
|
||||
|
||||
*i = v; // a good alternative could be something like write(x, v)
|
||||
}
|
||||
ValueType v;
|
||||
Iterator i;
|
||||
};
|
||||
|
||||
template <typename Iterator>
|
||||
class ConstantLvalueIteratorConcept {
|
||||
public:
|
||||
typedef typename std::iterator_traits<Iterator>::value_type value_type;
|
||||
typedef typename std::iterator_traits<Iterator>::reference reference;
|
||||
typedef typename boost::return_category<Iterator>::type return_category;
|
||||
|
||||
void constraints() {
|
||||
boost::function_requires< ReadableIteratorConcept<Iterator> >();
|
||||
|
||||
BOOST_STATIC_ASSERT((boost::is_convertible<return_category*,
|
||||
boost::constant_lvalue_iterator_tag*>::value));
|
||||
|
||||
BOOST_STATIC_ASSERT((boost::is_same<reference,
|
||||
const value_type&>::value));
|
||||
|
||||
reference v = *i;
|
||||
boost::ignore_unused_variable_warning(v);
|
||||
}
|
||||
Iterator i;
|
||||
};
|
||||
|
||||
template <typename Iterator>
|
||||
class MutableLvalueIteratorConcept {
|
||||
public:
|
||||
typedef typename std::iterator_traits<Iterator>::value_type value_type;
|
||||
typedef typename std::iterator_traits<Iterator>::reference reference;
|
||||
typedef typename boost::return_category<Iterator>::type return_category;
|
||||
|
||||
void constraints() {
|
||||
boost::function_requires< ReadableIteratorConcept<Iterator> >();
|
||||
boost::function_requires<
|
||||
WritableIteratorConcept<Iterator, value_type> >();
|
||||
|
||||
BOOST_STATIC_ASSERT((boost::is_convertible<return_category*,
|
||||
boost::mutable_lvalue_iterator_tag*>::value));
|
||||
|
||||
BOOST_STATIC_ASSERT((boost::is_same<reference, value_type&>::value));
|
||||
|
||||
reference v = *i;
|
||||
boost::ignore_unused_variable_warning(v);
|
||||
}
|
||||
Iterator i;
|
||||
};
|
||||
|
||||
//===========================================================================
|
||||
// Iterator Traversal Concepts
|
||||
|
||||
template <typename Iterator>
|
||||
class ForwardIteratorConcept {
|
||||
public:
|
||||
typedef typename boost::traversal_category<Iterator>::type traversal_category;
|
||||
|
||||
void constraints() {
|
||||
boost::function_requires< boost::SGIAssignableConcept<Iterator> >();
|
||||
boost::function_requires< boost::EqualityComparableConcept<Iterator> >();
|
||||
boost::function_requires<
|
||||
boost::DefaultConstructibleConcept<Iterator> >();
|
||||
|
||||
BOOST_STATIC_ASSERT((boost::is_convertible<traversal_category*,
|
||||
boost::forward_traversal_tag*>::value));
|
||||
++i;
|
||||
(void)i++;
|
||||
}
|
||||
Iterator i;
|
||||
};
|
||||
|
||||
template <typename Iterator>
|
||||
class BidirectionalIteratorConcept {
|
||||
public:
|
||||
typedef typename boost::traversal_category<Iterator>::type traversal_category;
|
||||
|
||||
void constraints() {
|
||||
boost::function_requires< ForwardIteratorConcept<Iterator> >();
|
||||
|
||||
BOOST_STATIC_ASSERT((boost::is_convertible<traversal_category*,
|
||||
boost::bidirectional_traversal_tag*>::value));
|
||||
|
||||
--i;
|
||||
(void)i--;
|
||||
}
|
||||
Iterator i;
|
||||
};
|
||||
|
||||
template <typename Iterator>
|
||||
class RandomAccessIteratorConcept {
|
||||
public:
|
||||
typedef typename boost::traversal_category<Iterator>::type traversal_category;
|
||||
typedef typename std::iterator_traits<Iterator>::difference_type
|
||||
difference_type;
|
||||
|
||||
void constraints() {
|
||||
boost::function_requires< BidirectionalIteratorConcept<Iterator> >();
|
||||
|
||||
BOOST_STATIC_ASSERT((boost::is_convertible<traversal_category*,
|
||||
boost::random_access_traversal_tag*>::value));
|
||||
|
||||
i += n;
|
||||
i = i + n;
|
||||
i = n + i;
|
||||
i -= n;
|
||||
i = i - n;
|
||||
n = i - j;
|
||||
}
|
||||
difference_type n;
|
||||
Iterator i, j;
|
||||
};
|
||||
|
||||
} // namespace boost_concepts
|
||||
|
||||
|
||||
#endif // BOOST_ITERATOR_CONCEPTS_HPP
|
@ -1,73 +0,0 @@
|
||||
#include <boost/iterator_concepts.hpp>
|
||||
#include <boost/operators.hpp>
|
||||
|
||||
struct new_iterator
|
||||
: public boost::iterator<std::random_access_iterator_tag, int>,
|
||||
public boost::new_iterator_base
|
||||
{
|
||||
typedef boost::random_access_traversal_tag traversal_category;
|
||||
typedef boost::mutable_lvalue_iterator_tag return_category;
|
||||
|
||||
int& operator*() const { return *m_x; }
|
||||
new_iterator& operator++() { return *this; }
|
||||
new_iterator operator++(int) { return *this; }
|
||||
new_iterator& operator--() { return *this; }
|
||||
new_iterator operator--(int) { return *this; }
|
||||
new_iterator& operator+=(std::ptrdiff_t) { return *this; }
|
||||
new_iterator operator+(std::ptrdiff_t) { return *this; }
|
||||
new_iterator& operator-=(std::ptrdiff_t) { return *this; }
|
||||
std::ptrdiff_t operator-(const new_iterator&) const { return 0; }
|
||||
new_iterator operator-(std::ptrdiff_t) const { return *this; }
|
||||
bool operator==(const new_iterator&) const { return false; }
|
||||
bool operator!=(const new_iterator&) const { return false; }
|
||||
bool operator<(const new_iterator&) const { return false; }
|
||||
int* m_x;
|
||||
};
|
||||
new_iterator operator+(std::ptrdiff_t, new_iterator x) { return x; }
|
||||
|
||||
struct old_iterator
|
||||
: public boost::iterator<std::random_access_iterator_tag, int>
|
||||
{
|
||||
int& operator*() const { return *m_x; }
|
||||
old_iterator& operator++() { return *this; }
|
||||
old_iterator operator++(int) { return *this; }
|
||||
old_iterator& operator--() { return *this; }
|
||||
old_iterator operator--(int) { return *this; }
|
||||
old_iterator& operator+=(std::ptrdiff_t) { return *this; }
|
||||
old_iterator operator+(std::ptrdiff_t) { return *this; }
|
||||
old_iterator& operator-=(std::ptrdiff_t) { return *this; }
|
||||
old_iterator operator-(std::ptrdiff_t) const { return *this; }
|
||||
std::ptrdiff_t operator-(const old_iterator&) const { return 0; }
|
||||
bool operator==(const old_iterator&) const { return false; }
|
||||
bool operator!=(const old_iterator&) const { return false; }
|
||||
bool operator<(const old_iterator&) const { return false; }
|
||||
int* m_x;
|
||||
};
|
||||
old_iterator operator+(std::ptrdiff_t, old_iterator x) { return x; }
|
||||
|
||||
int
|
||||
main()
|
||||
{
|
||||
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
|
||||
boost::function_requires<
|
||||
boost_concepts::MutableLvalueIteratorConcept<int*> >();
|
||||
boost::function_requires<
|
||||
boost_concepts::RandomAccessIteratorConcept<int*> >();
|
||||
|
||||
boost::function_requires<
|
||||
boost_concepts::ConstantLvalueIteratorConcept<const int*> >();
|
||||
boost::function_requires<
|
||||
boost_concepts::RandomAccessIteratorConcept<const int*> >();
|
||||
#endif
|
||||
|
||||
boost::function_requires<
|
||||
boost_concepts::MutableLvalueIteratorConcept<new_iterator> >();
|
||||
boost::function_requires<
|
||||
boost_concepts::RandomAccessIteratorConcept<new_iterator> >();
|
||||
|
||||
boost::function_requires<
|
||||
boost_concepts::MutableLvalueIteratorConcept<old_iterator> >();
|
||||
boost::function_requires<
|
||||
boost_concepts::RandomAccessIteratorConcept<old_iterator> >();
|
||||
return 0;
|
||||
}
|
@ -1,160 +0,0 @@
|
||||
<html>
|
||||
<!--
|
||||
-- Copyright (c) Jeremy Siek 2000,2001
|
||||
--
|
||||
-- Permission to use, copy, modify, distribute and sell this software
|
||||
-- and its documentation for any purpose is hereby granted without fee,
|
||||
-- provided that the above copyright notice appears in all copies and
|
||||
-- that both that copyright notice and this permission notice appear
|
||||
-- in supporting documentation. I make no representations about the
|
||||
-- suitability of this software for any purpose. It is provided "as is"
|
||||
-- without express or implied warranty.
|
||||
-->
|
||||
<head>
|
||||
<title>Boost Iterator Traits</title>
|
||||
</head>
|
||||
|
||||
<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
|
||||
ALINK="#ff0000">
|
||||
<IMG SRC="../../../../c++boost.gif"
|
||||
ALT="C++ Boost" width="277" height="86">
|
||||
<BR Clear>
|
||||
|
||||
<h1>Boost Iterator Category Traits</h1>
|
||||
Header <tt><a href="../../boost/iterator_categories.hpp">boost/iterator_categories.hpp</a></tt>
|
||||
|
||||
<p>
|
||||
The <tt>boost::traversal_category</tt> and
|
||||
<tt>boost::return_category</tt> traits classes provides access to the
|
||||
category tags for iterators that model the Boost <a
|
||||
href="./iterator_concepts.htm">Iterator Concepts</a>, which are a
|
||||
replacement for the iterator requirements in the C++ standard. The
|
||||
other associated types of the Boost iterator concepts are accessed
|
||||
through the <tt>std::iterator_traits</tt> class.
|
||||
|
||||
<ul>
|
||||
<li><tt>traversal_category<Iter>::type</tt> Can the iterator go forward, backward, etc.?
|
||||
<li><tt>return_category<Iter>::type</tt> Is the iterator read or write only?
|
||||
Is the dereferenced type an lvalue?
|
||||
</ul>
|
||||
|
||||
<p>
|
||||
An important feature of the <tt>boost::traversal_category</tt> and
|
||||
<tt>boost::return_category</tt> classes is that they are <b>backwards
|
||||
compatible</b>, i.e., they automatically work for iterators for which
|
||||
there are valid definitions of <tt>std::iterator_traits</tt>. The old
|
||||
<tt>iterator_category</tt> is mapped to the appropriate traversal and
|
||||
return categories.
|
||||
|
||||
<p>
|
||||
When creating a new iterator type that is meant to work with
|
||||
<tt>boost::traversal_category</tt> and
|
||||
<tt>boost::return_category</tt>, you can either create a
|
||||
specialization of these classes for your iterator type, or you can
|
||||
provide all the necessary associated types as nested typedefs. In
|
||||
this case, your iterator class will need to inherit from
|
||||
<tt>new_iterator_base</tt> to let the category traits know
|
||||
that it will be able to find typedefs for <tt>traversal_category</tt>
|
||||
and <tt>return_category</tt> in you iterator class.
|
||||
|
||||
|
||||
Each of the new iterator requirements will need a category tag.
|
||||
|
||||
<pre>
|
||||
namespace boost {
|
||||
|
||||
// Return Type Categories
|
||||
struct readable_iterator_tag { };
|
||||
struct writable_iterator_tag { };
|
||||
struct swappable_iterator_tag { };
|
||||
struct mutable_lvalue_iterator_tag : virtual public writable_iterator_tag,
|
||||
virtual public readable_iterator_tag { };
|
||||
struct constant_lvalue_iterator_tag : public readable_iterator_tag { };
|
||||
|
||||
// Traversal Categories
|
||||
struct forward_traversal_tag { };
|
||||
struct bidirectional_traversal_tag : public forward_traversal_tag { };
|
||||
struct random_access_traversal_tag : public bidirectional_traversal_tag { };
|
||||
|
||||
}
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
The following is pseudo-code for the iterator category traits classes.
|
||||
|
||||
<pre>
|
||||
namespace boost {
|
||||
|
||||
<i>// Inherit from iterator_base if your iterator defines its own
|
||||
// return_category and traversal_category. Otherwise, the "old style"
|
||||
// iterator category will be mapped to the return_category and
|
||||
// traversal_category.</i>
|
||||
struct new_iterator_base { };
|
||||
|
||||
template <typename Iterator>
|
||||
struct return_category
|
||||
{
|
||||
<b><i>// Pseudo-code</i></b>
|
||||
if (Iterator inherits from new_iterator_base) {
|
||||
typedef typename Iterator::return_category type;
|
||||
} else {
|
||||
typedef std::iterator_traits<Iterator> OldTraits;
|
||||
typedef typename OldTraits::iterator_category Cat;
|
||||
if (Cat inherits from std::forward_iterator_tag)
|
||||
if (is-const(T))
|
||||
typedef boost::constant_lvalue_iterator_tag type;
|
||||
else
|
||||
typedef boost::mutable_lvalue_iterator_tag type;
|
||||
else if (Cat inherits from std::input_iterator_tag)
|
||||
typedef boost::readable_iterator_tag type;
|
||||
else if (Cat inherits from std::output_iterator_tag)
|
||||
typedef boost::writable_iterator_tag type;
|
||||
}
|
||||
};
|
||||
|
||||
template <typename T>
|
||||
struct return_category<T*>
|
||||
{
|
||||
<b><i>// Pseudo-code</i></b>
|
||||
if (is-const(T))
|
||||
typedef boost::constant_lvalue_iterator_tag type;
|
||||
else
|
||||
typedef boost::mutable_lvalue_iterator_tag type;
|
||||
};
|
||||
|
||||
template <typename Iterator>
|
||||
struct traversal_category
|
||||
{
|
||||
<b><i>// Pseudo-code</i></b>
|
||||
if (Iterator inherits from new_iterator_base) {
|
||||
typedef typename Iterator::traversal_category type;
|
||||
} else {
|
||||
typedef std::iterator_traits<Iterator> OldTraits;
|
||||
typedef typename OldTraits::iterator_category Cat;
|
||||
|
||||
if (Cat inherits from std::random_access_iterator_tag)
|
||||
typedef boost::random_access_traversal_tag type;
|
||||
else if (Cat inherits from std::bidirectional_iterator_tag)
|
||||
typedef boost::bidirectional_traversal_tag type;
|
||||
else if (Cat inherits from std::forward_iterator_tag)
|
||||
typedef boost::forward_traversal_tag type;
|
||||
}
|
||||
};
|
||||
|
||||
template <typename T>
|
||||
struct traversal_category<T*>
|
||||
{
|
||||
typedef boost::random_access_traversal_tag type;
|
||||
};
|
||||
|
||||
}
|
||||
</pre>
|
||||
|
||||
<hr>
|
||||
<address><a href="mailto:jsiek@lsc.nd.edu">jeremy siek</a></address>
|
||||
<!-- Created: Sun Mar 18 14:06:57 EST 2001 -->
|
||||
<!-- hhmts start -->
|
||||
Last modified: Mon Mar 19 12:59:30 EST 2001
|
||||
<!-- hhmts end -->
|
||||
</body>
|
||||
</html>
|
@ -1,37 +0,0 @@
|
||||
#FIG 3.2
|
||||
Landscape
|
||||
Center
|
||||
Inches
|
||||
Letter
|
||||
100.00
|
||||
Single
|
||||
-2
|
||||
1200 2
|
||||
6 150 2325 4275 4350
|
||||
2 1 0 1 0 7 100 0 -1 4.000 0 0 -1 1 0 2
|
||||
1 1 1.00 60.00 120.00
|
||||
1725 4050 1725 3450
|
||||
2 1 0 1 0 7 100 0 -1 4.000 0 0 -1 1 0 2
|
||||
1 1 1.00 60.00 120.00
|
||||
1725 3150 1725 2550
|
||||
4 0 0 100 0 19 18 0.0000 4 210 3180 375 2550 ForwardTraversalIterator\001
|
||||
4 0 0 100 0 19 18 0.0000 4 210 3765 225 3450 BidirectionalTraversalIterator\001
|
||||
4 0 0 100 0 19 18 0.0000 4 210 4125 150 4350 RandomAccessTraversalIterator\001
|
||||
-6
|
||||
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 2
|
||||
1 1 1.00 60.00 120.00
|
||||
4800 3600 4800 2400
|
||||
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 2
|
||||
1 1 1.00 60.00 120.00
|
||||
6900 3000 5400 2400
|
||||
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 2
|
||||
1 1 1.00 60.00 120.00
|
||||
6900 3000 7500 2400
|
||||
2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 1 0 2
|
||||
1 1 1.00 60.00 120.00
|
||||
6900 3000 9075 2475
|
||||
4 0 0 100 0 19 18 0.0000 4 210 2040 6600 2400 WritableIterator\001
|
||||
4 0 0 100 0 19 18 0.0000 4 210 2145 3900 2400 ReadableIterator\001
|
||||
4 0 0 50 0 19 18 0.0000 4 210 2835 5700 3300 MutableLvalueIterator\001
|
||||
4 0 0 50 0 19 18 0.0000 4 270 2355 9075 2400 SwappableIterator\001
|
||||
4 0 0 50 0 19 18 0.0000 4 210 2970 3825 3900 ConstantLvalueIterator\001
|
Binary file not shown.
Before Width: | Height: | Size: 3.2 KiB |
@ -1,663 +0,0 @@
|
||||
<HTML>
|
||||
<!--
|
||||
-- Copyright (c) Jeremy Siek 2000
|
||||
--
|
||||
-- Permission to use, copy, modify, distribute and sell this software
|
||||
-- and its documentation for any purpose is hereby granted without fee,
|
||||
-- provided that the above copyright notice appears in all copies and
|
||||
-- that both that copyright notice and this permission notice appear
|
||||
-- in supporting documentation. I make no representations about the
|
||||
-- suitability of this software for any purpose. It is provided "as is"
|
||||
-- without express or implied warranty.
|
||||
-->
|
||||
<!--
|
||||
-- Copyright (c) 1996-1999
|
||||
-- Silicon Graphics Computer Systems, Inc.
|
||||
--
|
||||
-- Permission to use, copy, modify, distribute and sell this software
|
||||
-- and its documentation for any purpose is hereby granted without fee,
|
||||
-- provided that the above copyright notice appears in all copies and
|
||||
-- that both that copyright notice and this permission notice appear
|
||||
-- in supporting documentation. Silicon Graphics makes no
|
||||
-- representations about the suitability of this software for any
|
||||
-- purpose. It is provided "as is" without express or implied warranty.
|
||||
--
|
||||
-- Copyright (c) 1994
|
||||
-- Hewlett-Packard Company
|
||||
--
|
||||
-- Permission to use, copy, modify, distribute and sell this software
|
||||
-- and its documentation for any purpose is hereby granted without fee,
|
||||
-- provided that the above copyright notice appears in all copies and
|
||||
-- that both that copyright notice and this permission notice appear
|
||||
-- in supporting documentation. Hewlett-Packard Company makes no
|
||||
-- representations about the suitability of this software for any
|
||||
-- purpose. It is provided "as is" without express or implied warranty.
|
||||
--
|
||||
-->
|
||||
<Head>
|
||||
<Title>Iterator Concepts</Title>
|
||||
<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
|
||||
ALINK="#ff0000">
|
||||
<IMG SRC="../../../../c++boost.gif"
|
||||
ALT="C++ Boost" width="277" height="86">
|
||||
|
||||
<BR Clear>
|
||||
|
||||
|
||||
<h1>Iterator Concepts</h1>
|
||||
|
||||
<p>The standard iterator categories and requirements are flawed because
|
||||
they use a single hierarchy of requirements to address two orthogonal
|
||||
issues: <b><i>iterator traversal</i></b> and <b><i>dereference return
|
||||
type</i></b>. The current iterator requirement hierarchy is mainly
|
||||
geared towards iterator traversal (hence the category names), while
|
||||
requirements that address dereference return type sneak in at various
|
||||
places.
|
||||
|
||||
<p>
|
||||
The iterator requirements should be separated into two hierarchies.
|
||||
One set of concepts handles the return type semantics:
|
||||
<ul>
|
||||
<li><a href="#concept:ReadableIterator">Readable Iterator</a></li>
|
||||
<li><a href="#concept:WritableIterator">Writable Iterator</a></li>
|
||||
<li><a href="#concept:SwappableIterator">Swappable Iterator</a></li>
|
||||
<li><a href="#concept:ConstantLvalueIterator">Constant Lvalue Iterator</a></li>
|
||||
<li><a href="#concept:MutableLvalueIterator">Mutable Lvalue Iterator</a></li>
|
||||
</ul>
|
||||
|
||||
The other set of concepts handles iterator traversal:
|
||||
|
||||
<ul>
|
||||
<li><a href="#concept:ForwardTraversalIterator">Forward Traversal Iterator</a></li>
|
||||
<li><a href="#concept:BidirectionalTraversalIterator">Bidirectional Traversal Iterator</a></li>
|
||||
<li><a href="#concept:RandomAccessTraversalIterator">Random Access Traversal Iterator</a></li>
|
||||
</ul>
|
||||
|
||||
The current Input Iterator and Output Iterator requirements will
|
||||
continue to be used as is. Note that Input Iterator implies Readable
|
||||
Iterator and Output Iterator implies Writable Iterator.
|
||||
|
||||
<p>
|
||||
Note: we considered defining a Single-Pass Iterator, which could be
|
||||
combined with Readable or Writable Iterator to replace the Input and
|
||||
Output Iterator requirements. We rejected this idea because there are
|
||||
some differences between Input and Output Iterators that make it hard
|
||||
to merge them: for example Input Iterator requires Equality Comparable
|
||||
while Output Iterator does not.
|
||||
|
||||
|
||||
<p></p>
|
||||
<DIV ALIGN="CENTER"><A NAME="fig:graph-concepts"></A></A>
|
||||
<TABLE>
|
||||
<CAPTION ALIGN="TOP"><STRONG>Figure 1:</STRONG>
|
||||
The iterator concepts and refinement relationships.
|
||||
</CAPTION>
|
||||
<TR><TD><IMG SRC="./iterator_concepts.gif" ></TD></TR>
|
||||
</TABLE>
|
||||
</DIV>
|
||||
<p></p>
|
||||
|
||||
|
||||
<h2>Relationship with the standard iterator concepts</h2>
|
||||
|
||||
<p>
|
||||
std::Input Iterator implies boost::ReadableIterator.
|
||||
|
||||
<p>
|
||||
std::Output Iterator implies boost::Writable Iterator.
|
||||
|
||||
<p>
|
||||
std::Forward Iterator refines boost::Forward Iterator and
|
||||
boost::Constant Lvalue Iterator or boost::Mutable Lvalue Iterator.
|
||||
|
||||
<p>
|
||||
std::Bidirectional Iterator refines boost::Bidirectional Iterator and
|
||||
boost::Constant Lvalue Iterator or boost::Mutable Lvalue Iterator.
|
||||
|
||||
<p>
|
||||
std::Random Access Iterator refines boost::Random Access Iterator and
|
||||
boost::Constant Lvalue Iterator or boost::Mutable Lvalue Iterator.
|
||||
|
||||
|
||||
<h3>Notation</h3>
|
||||
<Table>
|
||||
<tr>
|
||||
<td><tt>X</tt></td>
|
||||
<td>The iterator type.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><tt>T</tt></td>
|
||||
<td>The value type of <tt>X</tt>, i.e., <tt>std::iterator_traits<X>::value_type</tt>.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><tt>x</tt>, <tt>y</tt></td>
|
||||
<td>An object of type <tt>X</tt>.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><tt>t</tt></td>
|
||||
<td>An object of type <tt>T</tt>.</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<p>
|
||||
|
||||
<hr>
|
||||
<!--------------------------------------------------------------------------->
|
||||
|
||||
<H3><A NAME="concept:ReadableIterator"></A>
|
||||
Readable Iterator
|
||||
</H3>
|
||||
|
||||
A Readable Iterator is an iterator that dereferences to produce an
|
||||
rvalue that is convertible to the <tt>value_type</tt> of the
|
||||
iterator.
|
||||
|
||||
<h3>Associated Types</h3>
|
||||
|
||||
<Table border>
|
||||
|
||||
<tr>
|
||||
<td>Value type</td>
|
||||
<td><tt>std::iterator_traits<X>::value_type</tt></td>
|
||||
<td>The type of the objects pointed to by the iterator.</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td>Reference type</td>
|
||||
<td><tt>std::iterator_traits<X>::reference</tt></td>
|
||||
<td>
|
||||
The return type of dereferencing the iterator. This
|
||||
type must be convertible to <tt>T</tt>.
|
||||
</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td>Return Category</td>
|
||||
<td><tt>std::return_category<X>::type</tt></td>
|
||||
<td>
|
||||
A type convertible to <tt>std::readable_iterator_tag</tt>
|
||||
</td>
|
||||
</tr>
|
||||
|
||||
</Table>
|
||||
|
||||
<h3>Refinement of</h3>
|
||||
|
||||
<A href="http://www.boost.org/libs/utility/CopyConstructible.html">Copy Constructible</A>
|
||||
|
||||
<h3>Valid expressions</h3>
|
||||
|
||||
<Table border>
|
||||
<tr><TH>Name</TH><TH>Expression</TH><TH>Type requirements</TH><TH>Return type</TH></tr>
|
||||
<tr>
|
||||
<td>Dereference</td>
|
||||
<td><tt>*x</tt></td>
|
||||
<td> </td>
|
||||
<td><tt>std::iterator_traits<X>::reference</tt></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Member access</td>
|
||||
<td><tt>x->m</tt></td>
|
||||
<td><tt>T</tt> is a type with a member named <tt>m</tt>.</td>
|
||||
<td>
|
||||
If <tt>m</tt> is a data member, the type of <tt>m</tt>.
|
||||
If <tt>m</tt> is a member function, the return type of <tt>m</tt>.
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<p>
|
||||
|
||||
<hr>
|
||||
<!--------------------------------------------------------------------------->
|
||||
|
||||
<H3><A NAME="concept:WritableIterator"></A>
|
||||
Writable Iterator
|
||||
</H3>
|
||||
|
||||
A Writable Iterator is an iterator that can be used to store a value
|
||||
using the dereference-assignment expression.
|
||||
|
||||
<h3>Definitions</h3>
|
||||
|
||||
If <tt>x</tt> is an Writable Iterator of type <tt>X</tt>, then the
|
||||
expression <tt>*x = a;</tt> stores the value <tt>a</tt> into
|
||||
<tt>x</tt>. Note that <tt>operator=</tt>, like other C++ functions,
|
||||
may be overloaded; it may, in fact, even be a template function. In
|
||||
general, then, <tt>a</tt> may be any of several different types. A
|
||||
type <tt>A</tt> belongs to the <i>set of value types</i> of <tt>X</tt>
|
||||
if, for an object <tt>a</tt> of type <tt>A</tt>, <tt>*x = a;</tt> is
|
||||
well-defined and does not require performing any non-trivial
|
||||
conversions on <tt>a</tt>.
|
||||
|
||||
<h3>Associated Types</h3>
|
||||
|
||||
<Table border>
|
||||
|
||||
<tr>
|
||||
<td>Return Category</td>
|
||||
<td><tt>std::return_category<X>::type</tt></td>
|
||||
<td>
|
||||
A type convertible to <tt>std::writable_iterator_tag</tt>
|
||||
</td>
|
||||
</tr>
|
||||
|
||||
</Table>
|
||||
|
||||
|
||||
|
||||
<h3>Refinement of</h3>
|
||||
|
||||
<A href="http://www.boost.org/libs/utility/CopyConstructible.html">Copy Constructible</A>
|
||||
|
||||
<h3>Valid expressions</h3>
|
||||
|
||||
<Table border>
|
||||
<tr>
|
||||
<TH>Name</TH><TH>Expression</TH><TH>Return type</TH>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Dereference assignment</td>
|
||||
<td><tt>*x = a</tt></td>
|
||||
<td>unspecified</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<p>
|
||||
|
||||
|
||||
<hr>
|
||||
<!--------------------------------------------------------------------------->
|
||||
|
||||
<H3><A NAME="concept:SwappableIterator"></A>
|
||||
Swappable Iterator
|
||||
</H3>
|
||||
|
||||
A Swappable Iterator is an iterator whose dereferenced values can be
|
||||
swapped.
|
||||
|
||||
<p>
|
||||
Note: the requirements for Swappable Iterator are dependent on the
|
||||
issues surrounding <tt>std::swap()</tt> being resolved. Here we assume
|
||||
that the issue will be resolved by allowing the overload of
|
||||
<tt>std::swap()</tt> for user-defined types.
|
||||
|
||||
<p>
|
||||
Note: Readable Iterator and Writable Iterator combined implies
|
||||
Swappable Iterator because of the fully templated
|
||||
<tt>std::swap()</tt>. However, Swappable Iterator does not imply
|
||||
Readable Iterator nor Writable Iterator.
|
||||
|
||||
<h3>Associated Types</h3>
|
||||
|
||||
<Table border>
|
||||
|
||||
<tr>
|
||||
<td>Return Category</td>
|
||||
<td><tt>std::return_category<X>::type</tt></td>
|
||||
<td>
|
||||
A type convertible to <tt>std::swappable_iterator_tag</tt>
|
||||
</td>
|
||||
</tr>
|
||||
|
||||
</Table>
|
||||
|
||||
|
||||
<h3>Valid expressions</h3>
|
||||
|
||||
Of the two valid expressions listed below, only one <b>OR</b> the
|
||||
other is required. If <tt>std::iter_swap()</tt> is overloaded for
|
||||
<tt>X</tt> then <tt>std::swap()</tt> is not required. If
|
||||
<tt>std::iter_swap()</tt> is not overloaded for <tt>X</tt> then the
|
||||
default (fully templated) version is used, which will call
|
||||
<tt>std::swap()</tt> (this means changing the current requirements for
|
||||
<tt>std::iter_swap()</tt>).
|
||||
|
||||
<p>
|
||||
<Table border>
|
||||
<tr>
|
||||
<TH>Name</TH><TH>Expression</TH><TH>Return type</TH>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td>Iterator Swap</td>
|
||||
<td><tt>std::iter_swap(x, y)</tt></td>
|
||||
<td>void</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td>Dereference and Swap</td>
|
||||
<td><tt>std::swap(*x, *y)</tt></td>
|
||||
<td>void</td>
|
||||
</tr>
|
||||
|
||||
</table>
|
||||
|
||||
<p>
|
||||
|
||||
|
||||
<hr>
|
||||
<!--------------------------------------------------------------------------->
|
||||
|
||||
<H3><A NAME="concept:ConstantLvalueIterator"></A>
|
||||
Constant Lvalue Iterator
|
||||
</H3>
|
||||
|
||||
A Constant Lvalue Iterator is an iterator that dereferences to produce a
|
||||
const reference to the pointed-to object, i.e., the associated
|
||||
<tt>reference</tt> type is <tt>const T&</tt>. Changing the value
|
||||
of or destroying an iterator that models Constant Lvalue Iterator does
|
||||
not invalidate pointers and references previously obtained from that
|
||||
iterator.
|
||||
|
||||
|
||||
<h3>Refinement of</h3>
|
||||
|
||||
<a href="#concept:ReadableIterator">Readable Iterator</a>
|
||||
|
||||
<h3>Associated Types</h3>
|
||||
|
||||
<Table border>
|
||||
|
||||
<tr>
|
||||
<td>Reference type</td>
|
||||
<td><tt>std::iterator_traits<X>::reference</tt></td>
|
||||
<td>
|
||||
The return type of dereferencing the iterator, which must be
|
||||
<tt>const T&</tt>.
|
||||
</td>
|
||||
</tr>
|
||||
|
||||
<!-- I don't think this is needed
|
||||
<tr>
|
||||
<td>Pointer type</td>
|
||||
<td><tt>std::iterator_traits<X>::pointer</tt></td>
|
||||
<td>
|
||||
The pointer to the value type, which must be <tt>const T*</tt>.
|
||||
</td>
|
||||
</tr>
|
||||
-->
|
||||
|
||||
<tr>
|
||||
<td>Return Category</td>
|
||||
<td><tt>std::return_category<X>::type</tt></td>
|
||||
<td>
|
||||
A type convertible to <tt>std::constant_lvalue_iterator_tag</tt>
|
||||
</td>
|
||||
</tr>
|
||||
|
||||
</table>
|
||||
|
||||
<!-- these are not necessary now that we use reference as operator* return type
|
||||
<h3>Valid expressions</h3>
|
||||
|
||||
<Table border>
|
||||
<tr><TH>Name</TH><TH>Expression</TH><TH>Type requirements</TH><TH>Return type</TH></tr>
|
||||
<tr>
|
||||
<td>Dereference</td>
|
||||
<td><tt>*x</tt></td>
|
||||
<td> </td>
|
||||
<td><tt>std::iterator_traits<X>::reference</tt></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Member access</td>
|
||||
<td><tt>x->m</tt></td>
|
||||
<td><tt>T</tt> is a type with a member named <tt>m</tt>.</td>
|
||||
<td>
|
||||
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
-->
|
||||
|
||||
<p>
|
||||
|
||||
<hr>
|
||||
<!--------------------------------------------------------------------------->
|
||||
|
||||
<H3><A NAME="concept:MutableLvalueIterator"></A>
|
||||
Mutable Lvalue Iterator
|
||||
</H3>
|
||||
|
||||
A Mutable Lvalue Iterator is an iterator that dereferences to produce a
|
||||
reference to the pointed-to object. The associated <tt>reference</tt>
|
||||
type is <tt>T&</tt>. Changing the value of or destroying an
|
||||
iterator that models Mutable Lvalue Iterator does not invalidate
|
||||
pointers and references previously obtained from that iterator.
|
||||
|
||||
<h3>Refinement of</h3>
|
||||
|
||||
<a href="#concept:ReadableIterator">Readable Iterator</a>,
|
||||
<a href="#concept:WritableIterator">Writable Iterator</a>,
|
||||
and <a href="#concept:SwappableIterator">Swappable Iterator</a>.
|
||||
|
||||
|
||||
|
||||
<h3>Associated Types</h3>
|
||||
|
||||
<Table border>
|
||||
|
||||
<tr>
|
||||
<td>Reference type</td>
|
||||
<td><tt>std::iterator_traits<X>::reference</tt></td>
|
||||
<td>The return type of dereferencing the iterator, which must be
|
||||
<tt>T&</tt>.</td>
|
||||
</tr>
|
||||
|
||||
<!-- I don't think this is necessary
|
||||
<tr>
|
||||
<td>Pointer type</td>
|
||||
<td><tt>std::iterator_traits<X>::pointer</tt></td>
|
||||
<td>
|
||||
The pointer to the value type, which is <tt>T*</tt>.
|
||||
</td>
|
||||
</tr>
|
||||
-->
|
||||
|
||||
<tr>
|
||||
<td>Return Category</td>
|
||||
<td><tt>std::return_category<X>::type</tt></td>
|
||||
<td>
|
||||
A type convertible to <tt>std::mutable_lvalue_iterator_tag</tt>
|
||||
</td>
|
||||
</tr>
|
||||
|
||||
</table>
|
||||
|
||||
<!-- no longer needed since the return type is specified as reference in the readable iterator
|
||||
<h3>Valid expressions</h3>
|
||||
|
||||
<Table border>
|
||||
<tr><TH>Name</TH><TH>Expression</TH><TH>Type requirements</TH><TH>Return type</TH></tr>
|
||||
<tr>
|
||||
<td>Dereference</td>
|
||||
<td><tt>*x</tt></td>
|
||||
<td> </td>
|
||||
<td><tt>std::iterator_traits<X>::reference</tt></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Member access</td>
|
||||
<td><tt>x->m</tt></td>
|
||||
<td><tt>T</tt> is a type with a member named <tt>m</tt>.</td>
|
||||
<td>
|
||||
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
-->
|
||||
|
||||
<p>
|
||||
<hr>
|
||||
<!--------------------------------------------------------------------------->
|
||||
|
||||
<H3><A NAME="concept:ForwardTraversalIterator"></A>
|
||||
Forward Traversal Iterator
|
||||
</H3>
|
||||
|
||||
The Forward Iterator is an iterator that can be incremented. Also, it
|
||||
is permissible to make multiple passes through the iterator's range.
|
||||
|
||||
<h3>Refinement of</h3>
|
||||
|
||||
<A href="http://www.boost.org/libs/utility/CopyConstructible.html">Copy Constructible</A>,
|
||||
<A href="http://www.boost.org/libs/utility/Assignable.html">Assignable</A>,
|
||||
<A href="http://www.sgi.com/tech/stl/DefaultConstructible.html">Default Constructible</A>, and
|
||||
<A href="http://www.sgi.com/tech/stl/EqualityComparable.html">Equality Comparable</A>
|
||||
|
||||
|
||||
<h3>Associated types</h3>
|
||||
|
||||
<Table border>
|
||||
|
||||
<tr>
|
||||
<td>Difference Type</td>
|
||||
<td><tt>std::iterator_traits<X>::difference_type</tt></td>
|
||||
<td>
|
||||
A signed integral type used for representing distances
|
||||
between iterators that point into the same range.
|
||||
</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td>Traversal Category</td>
|
||||
<td><tt>std::traversal_category<X>::type</tt></td>
|
||||
<td>
|
||||
A type convertible to <tt>std::forward_traversal_tag</tt>
|
||||
</td>
|
||||
</tr>
|
||||
</Table>
|
||||
|
||||
<h3>Valid expressions</h3>
|
||||
|
||||
<Table border>
|
||||
<tr>
|
||||
<TH>Name</TH><TH>Expression</TH><TH>Type requirements</TH>
|
||||
<TH>Return type</TH>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Preincrement</td>
|
||||
<td><tt>++i</tt></td><td> </td><td><tt>X&</tt></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Postincrement</td>
|
||||
<td><tt>i++</tt></td><td> </td><td>convertible to <tt>const X&</tt></td>
|
||||
</tr>
|
||||
</Table>
|
||||
|
||||
<p>
|
||||
<hr>
|
||||
<!--------------------------------------------------------------------------->
|
||||
|
||||
<H3><A NAME="concept:BidirectionalTraversalIterator"></A>
|
||||
Bidirectional Traversal Iterator
|
||||
</H3>
|
||||
|
||||
An iterator that can be incremented and decremented.
|
||||
|
||||
<h3>Refinement of</h3>
|
||||
|
||||
<a href="#concept:ForwardTraversalIterator">Forward Traversal Iterator</a>
|
||||
|
||||
<h3>Associated types</h3>
|
||||
|
||||
<Table border>
|
||||
<tr>
|
||||
<td>Traversal Category</td>
|
||||
<td><tt>std::traversal_category<X>::type</tt></td>
|
||||
<td>
|
||||
A type convertible to <tt>std::bidirectional_traversal_tag</tt>
|
||||
</td>
|
||||
</tr>
|
||||
</Table>
|
||||
|
||||
<h3>Valid expressions</h3>
|
||||
|
||||
<Table border>
|
||||
<tr>
|
||||
<TH>Name</TH><TH>Expression</TH><TH>Type requirements</TH>
|
||||
<TH>Return type</TH>
|
||||
</tr>
|
||||
<tr><td>Predecrement</td>
|
||||
<td><tt>--i</tt></td><td> </td><td><tt>X&</tt></td>
|
||||
</tr>
|
||||
<tr><td>Postdecrement</td>
|
||||
<td><tt>i--</tt></td><td> </td><td>convertible to <tt>const X&</tt></td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<p>
|
||||
<hr>
|
||||
<!--------------------------------------------------------------------------->
|
||||
|
||||
<H3><A NAME="concept:RandomAccessTraversalIterator"></A>
|
||||
Random Access Traversal Iterator
|
||||
</H3>
|
||||
|
||||
An iterator that provides constant-time methods for moving forward and
|
||||
backward in arbitrary-sized steps.
|
||||
|
||||
<h3>Refinement of</h3>
|
||||
|
||||
<a href="#concept:BidirectionalTraversalIterator">Bidirectional Traversal Iterator</a> and
|
||||
<A href="http://www.sgi.com/tech/stl/LessThanComparable.html">Less Than Comparable</A> where <tt><</tt> is a total ordering
|
||||
|
||||
<h3>Associated types</h3>
|
||||
|
||||
<Table border>
|
||||
<tr>
|
||||
<td>Traversal Category</td>
|
||||
<td><tt>std::traversal_category<X>::type</tt></td>
|
||||
<td>
|
||||
A type convertible to <tt>std::random_access_traversal_tag</tt>
|
||||
</td>
|
||||
</tr>
|
||||
</Table>
|
||||
|
||||
<h3>Valid expressions</h3>
|
||||
|
||||
<Table border>
|
||||
<tr><TH>Name</TH><TH>Expression</TH><TH>Type requirements</TH>
|
||||
<TH>Return type</TH>
|
||||
</tr>
|
||||
<tr><td>Iterator addition</td>
|
||||
<td><tt>i += n</tt></td><td> </td><td><tt>X&</tt></td>
|
||||
</tr>
|
||||
<tr><td>Iterator addition</td>
|
||||
<td><tt>i + n</tt> or <tt>n + i</tt></td><td> </td><td><tt>X</tt></td>
|
||||
</tr>
|
||||
<tr><td>Iterator subtraction</td>
|
||||
<td><tt>i -= n</tt></td><td> </td><td><tt>X&</tt></td>
|
||||
</tr>
|
||||
<tr><td>Iterator subtraction</td>
|
||||
<td><tt>i - n</tt></td><td> </td><td><tt>X</tt></td>
|
||||
</tr>
|
||||
<tr><td>Difference</td>
|
||||
<td><tt>i - j</tt></td><td> </td><td><tt>std::iterator_traits<X>::difference_type</tt></td>
|
||||
</tr>
|
||||
<tr><td>Element operator</td>
|
||||
<td><tt>i[n]</tt></td>
|
||||
<td><tt>X</tt> must also be a model of
|
||||
<a href="#concept:ReadableIterator">Readable Iterator</a>. </td>
|
||||
<td><tt>std::iterator_traits<X>::reference</tt></td>
|
||||
</tr>
|
||||
<tr><td>Element assignment</td>
|
||||
<td><tt>i[n] = t</tt></td>
|
||||
<td><tt>X</tt> must also be a model of
|
||||
<a href="#concept:WritableIterator">Writable Iterator</a>.</td>
|
||||
<td>unspecified</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<p>
|
||||
|
||||
<HR>
|
||||
<TABLE>
|
||||
<TR valign=top>
|
||||
<TD nowrap>Copyright © 2000</TD><TD>
|
||||
<A HREF="../../../../people/jeremy_siek.htm">Jeremy Siek</A>, Univ.of Notre Dame (<A HREF="mailto:jsiek@lsc.nd.edu">jsiek@lsc.nd.edu</A>)
|
||||
</TD></TR></TABLE>
|
||||
|
||||
</body>
|
||||
</html>
|
@ -1 +0,0 @@
|
||||
GNUmakefile
|
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|
||||
<meta name="generator" content="Docutils 0.5: http://docutils.sourceforge.net/" />
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||||
<title>Bidirectional Traversal Concept</title>
|
||||
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|
||||
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|
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||||
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||||
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<h1 class="title">Forward Traversal Concept</h1>
|
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||||
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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doc/ForwardTraversal.rst
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|
||||
<h1 class="title">Incrementable Iterator Concept</h1>
|
||||
|
||||
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
|
||||
<!-- Software License, Version 1.0. (See accompanying -->
|
||||
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|
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@ -336,6 +55,12 @@ stated semantics.</p>
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|
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|
0
doc/IncrementableIterator.rst
Executable file → Normal file
0
doc/IncrementableIterator.rst
Executable file → Normal file
@ -13,8 +13,11 @@ boostbook standalone
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iterator
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|
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<h1 class="title">Lvalue Iterator Concept</h1>
|
||||
|
||||
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
|
||||
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|
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<a class="reference external" href="LvalueIterator.rst">View document source</a>.
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Executable file → Normal file
0
doc/LvalueIterator.rst
Executable file → Normal file
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||||
<div class="document" id="random-access-traversal-concept">
|
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<h1 class="title">Random Access Traversal Concept</h1>
|
||||
|
||||
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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@ -404,6 +123,12 @@ ordering relation</td>
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<div class="footer">
|
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|
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<a class="reference external" href="RandomAccessTraversal.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
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|
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</html>
|
||||
|
@ -3,295 +3,14 @@
|
||||
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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|
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|
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|
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|
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|
||||
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|
||||
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|
||||
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|
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|
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|
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0
doc/ReadableIterator.rst
Executable file → Normal file
0
doc/ReadableIterator.rst
Executable file → Normal file
@ -3,295 +3,14 @@
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|
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|
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<body>
|
||||
<div class="document" id="single-pass-iterator-concept">
|
||||
<h1 class="title">Single Pass Iterator Concept</h1>
|
||||
|
||||
<!-- Copyright David Abrahams 2006. 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) -->
|
||||
@ -338,6 +57,12 @@ relation over its domain</td>
|
||||
</tr>
|
||||
</tbody>
|
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</table>
|
||||
</div>
|
||||
<div class="footer">
|
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<hr class="footer" />
|
||||
<a class="reference external" href="SinglePassIterator.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
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||||
</div>
|
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</body>
|
||||
</html>
|
||||
|
0
doc/SinglePassIterator.rst
Executable file → Normal file
0
doc/SinglePassIterator.rst
Executable file → Normal file
@ -3,295 +3,14 @@
|
||||
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<meta name="generator" content="Docutils 0.5: http://docutils.sourceforge.net/" />
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||||
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|
||||
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||||
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|
||||
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|
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@ -324,6 +43,12 @@ exchanged</td>
|
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<dt>[<em>Note:</em> An iterator that is a model of the <em>Readable</em> and <em>Writable Iterator</em> concepts</dt>
|
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<dd>is also a model of <em>Swappable Iterator</em>. <em>--end note</em>]</dd>
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doc/SwappableIterator.rst
Executable file → Normal file
0
doc/SwappableIterator.rst
Executable file → Normal file
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<h1 class="title">Writable Iterator Concept</h1>
|
||||
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||||
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
|
||||
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<a class="reference external" href="WritableIterator.rst">View document source</a>.
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|
0
doc/WritableIterator.rst
Executable file → Normal file
0
doc/WritableIterator.rst
Executable file → Normal file
@ -3,295 +3,13 @@
|
||||
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<title>Counting Iterator</title>
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||||
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||||
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Default cascading style sheet for the HTML output of Docutils.
|
||||
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|
||||
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|
||||
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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h1 tt.docutils, h2 tt.docutils, h3 tt.docutils,
|
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|
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list-style-type: none }
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|
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</style>
|
||||
<link rel="stylesheet" href="../../../rst.css" type="text/css" />
|
||||
</head>
|
||||
<body>
|
||||
<div class="document" id="counting-iterator">
|
||||
@ -303,13 +21,13 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams, Jeremy Siek, Thomas Witt</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference external" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference external" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
Railway Operation and Construction</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.</td></tr>
|
||||
</tbody>
|
||||
@ -339,18 +57,18 @@ are forwarded to the adapted object.</p>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first">Table of Contents</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#counting-iterator-synopsis" id="id2" name="id2"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> synopsis</a></li>
|
||||
<li><a class="reference" href="#counting-iterator-requirements" id="id3" name="id3"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference" href="#counting-iterator-models" id="id4" name="id4"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference" href="#counting-iterator-operations" id="id5" name="id5"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference" href="#example" id="id6" name="id6">Example</a></li>
|
||||
<li><a class="reference internal" href="#counting-iterator-synopsis" id="id2"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> synopsis</a></li>
|
||||
<li><a class="reference internal" href="#counting-iterator-requirements" id="id3"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference internal" href="#counting-iterator-models" id="id4"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference internal" href="#counting-iterator-operations" id="id5"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference internal" href="#example" id="id6">Example</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id2" id="counting-iterator-synopsis" name="counting-iterator-synopsis"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> synopsis</a></h1>
|
||||
<div class="section" id="counting-iterator-synopsis">
|
||||
<h1><a class="toc-backref" href="#id2"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> synopsis</a></h1>
|
||||
<!-- Copyright David Abrahams 2006. 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) -->
|
||||
@ -389,10 +107,10 @@ algorithm:</p>
|
||||
if (CategoryOrTraversal is not use_default)
|
||||
return CategoryOrTraversal
|
||||
else if (numeric_limits<Incrementable>::is_specialized)
|
||||
return <a class="reference" href="iterator_facade.html#iterator-category"><em>iterator-category</em></a>(
|
||||
return <a class="reference external" href="iterator_facade.html#iterator-category"><em>iterator-category</em></a>(
|
||||
random_access_traversal_tag, Incrementable, const Incrementable&)
|
||||
else
|
||||
return <a class="reference" href="iterator_facade.html#iterator-category"><em>iterator-category</em></a>(
|
||||
return <a class="reference external" href="iterator_facade.html#iterator-category"><em>iterator-category</em></a>(
|
||||
iterator_traversal<Incrementable>::type,
|
||||
Incrementable, const Incrementable&)
|
||||
</pre>
|
||||
@ -403,8 +121,8 @@ the cases where <tt class="docutils literal"><span class="pre">std::numeric_limi
|
||||
is true.]</dd>
|
||||
</dl>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id3" id="counting-iterator-requirements" name="counting-iterator-requirements"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> requirements</a></h1>
|
||||
<div class="section" id="counting-iterator-requirements">
|
||||
<h1><a class="toc-backref" href="#id3"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> requirements</a></h1>
|
||||
<p>The <tt class="docutils literal"><span class="pre">Incrementable</span></tt> argument shall be Copy Constructible and Assignable.</p>
|
||||
<p>If <tt class="docutils literal"><span class="pre">iterator_category</span></tt> is convertible to <tt class="docutils literal"><span class="pre">forward_iterator_tag</span></tt>
|
||||
or <tt class="docutils literal"><span class="pre">forward_traversal_tag</span></tt>, the following must be well-formed:</p>
|
||||
@ -429,8 +147,8 @@ n = i - j;
|
||||
i < j;
|
||||
</pre>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id4" id="counting-iterator-models" name="counting-iterator-models"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> models</a></h1>
|
||||
<div class="section" id="counting-iterator-models">
|
||||
<h1><a class="toc-backref" href="#id4"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> models</a></h1>
|
||||
<p>Specializations of <tt class="docutils literal"><span class="pre">counting_iterator</span></tt> model Readable Lvalue
|
||||
Iterator. In addition, they model the concepts corresponding to the
|
||||
iterator tags to which their <tt class="docutils literal"><span class="pre">iterator_category</span></tt> is convertible.
|
||||
@ -445,8 +163,8 @@ concepts modeled by <tt class="docutils literal"><span class="pre">Incrementable
|
||||
<tt class="docutils literal"><span class="pre">counting_iterator<Y,C2,D2></span></tt> if and only if <tt class="docutils literal"><span class="pre">X</span></tt> is
|
||||
interoperable with <tt class="docutils literal"><span class="pre">Y</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id5" id="counting-iterator-operations" name="counting-iterator-operations"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> operations</a></h1>
|
||||
<div class="section" id="counting-iterator-operations">
|
||||
<h1><a class="toc-backref" href="#id5"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt> operations</a></h1>
|
||||
<p>In addition to the operations required by the concepts modeled by
|
||||
<tt class="docutils literal"><span class="pre">counting_iterator</span></tt>, <tt class="docutils literal"><span class="pre">counting_iterator</span></tt> provides the following
|
||||
operations.</p>
|
||||
@ -539,8 +257,8 @@ with <tt class="docutils literal"><span class="pre">current</span></tt> construc
|
||||
<!-- Software License, Version 1.0. (See accompanying -->
|
||||
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id6" id="example" name="example">Example</a></h1>
|
||||
<div class="section" id="example">
|
||||
<h1><a class="toc-backref" href="#id6">Example</a></h1>
|
||||
<p>This example fills an array with numbers and a second array with
|
||||
pointers into the first array, using <tt class="docutils literal"><span class="pre">counting_iterator</span></tt> for both
|
||||
tasks. Finally <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> is used to print out the numbers
|
||||
@ -570,8 +288,14 @@ std::cout << std::endl;
|
||||
indirectly printing out the numbers from 0 to 7
|
||||
0 1 2 3 4 5 6
|
||||
</pre>
|
||||
<p>The source code for this example can be found <a class="reference" href="../example/counting_iterator_example.cpp">here</a>.</p>
|
||||
<p>The source code for this example can be found <a class="reference external" href="../example/counting_iterator_example.cpp">here</a>.</p>
|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="counting_iterator.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
0
doc/counting_iterator.pdf
Executable file → Normal file
0
doc/counting_iterator.pdf
Executable file → Normal file
0
doc/docutils.sty
Executable file → Normal file
0
doc/docutils.sty
Executable file → Normal file
716
doc/facade-and-adaptor.html
Executable file → Normal file
716
doc/facade-and-adaptor.html
Executable file → Normal file
File diff suppressed because it is too large
Load Diff
0
doc/facade-and-adaptor.pdf
Executable file → Normal file
0
doc/facade-and-adaptor.pdf
Executable file → Normal file
0
doc/facade_iterator_category.rst
Executable file → Normal file
0
doc/facade_iterator_category.rst
Executable file → Normal file
@ -3,295 +3,13 @@
|
||||
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
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<meta name="generator" content="Docutils 0.4: http://docutils.sourceforge.net/" />
|
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<meta name="generator" content="Docutils 0.5: http://docutils.sourceforge.net/" />
|
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<title>Filter Iterator</title>
|
||||
<meta name="author" content="David Abrahams, Jeremy Siek, Thomas Witt" />
|
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|
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<meta name="date" content="2004-11-01" />
|
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|
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|
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|
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|
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|
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|
||||
</style>
|
||||
<link rel="stylesheet" href="../../../rst.css" type="text/css" />
|
||||
</head>
|
||||
<body>
|
||||
<div class="document" id="filter-iterator">
|
||||
@ -303,13 +21,13 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams, Jeremy Siek, Thomas Witt</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference external" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference external" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
Railway Operation and Construction</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.</td></tr>
|
||||
</tbody>
|
||||
@ -337,18 +55,18 @@ sequence to be traversed.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first">Table of Contents</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#filter-iterator-synopsis" id="id2" name="id2"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> synopsis</a></li>
|
||||
<li><a class="reference" href="#filter-iterator-requirements" id="id3" name="id3"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference" href="#filter-iterator-models" id="id4" name="id4"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference" href="#filter-iterator-operations" id="id5" name="id5"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference" href="#example" id="id6" name="id6">Example</a></li>
|
||||
<li><a class="reference internal" href="#filter-iterator-synopsis" id="id2"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> synopsis</a></li>
|
||||
<li><a class="reference internal" href="#filter-iterator-requirements" id="id3"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference internal" href="#filter-iterator-models" id="id4"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference internal" href="#filter-iterator-operations" id="id5"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference internal" href="#example" id="id6">Example</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id2" id="filter-iterator-synopsis" name="filter-iterator-synopsis"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> synopsis</a></h1>
|
||||
<div class="section" id="filter-iterator-synopsis">
|
||||
<h1><a class="toc-backref" href="#id2"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> synopsis</a></h1>
|
||||
<!-- Copyright David Abrahams, Jeremy Siek, and Thomas Witt -->
|
||||
<!-- 2004. Use, modification and distribution is subject to the Boost -->
|
||||
<!-- Software License, Version 1.0. (See accompanying file -->
|
||||
@ -392,8 +110,8 @@ Iterator then <tt class="docutils literal"><span class="pre">iterator_category</
|
||||
Otherwise <tt class="docutils literal"><span class="pre">iterator_category</span></tt> is
|
||||
convertible to <tt class="docutils literal"><span class="pre">std::input_iterator_tag</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id3" id="filter-iterator-requirements" name="filter-iterator-requirements"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> requirements</a></h1>
|
||||
<div class="section" id="filter-iterator-requirements">
|
||||
<h1><a class="toc-backref" href="#id3"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> requirements</a></h1>
|
||||
<p>The <tt class="docutils literal"><span class="pre">Iterator</span></tt> argument shall meet the requirements of Readable
|
||||
Iterator and Single Pass Iterator or it shall meet the requirements of
|
||||
Input Iterator.</p>
|
||||
@ -403,8 +121,8 @@ the expression <tt class="docutils literal"><span class="pre">p(x)</span></tt> m
|
||||
<tt class="docutils literal"><span class="pre">iterator_traits<Iterator>::value_type</span></tt>, and where the type of
|
||||
<tt class="docutils literal"><span class="pre">p(x)</span></tt> must be convertible to <tt class="docutils literal"><span class="pre">bool</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id4" id="filter-iterator-models" name="filter-iterator-models"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> models</a></h1>
|
||||
<div class="section" id="filter-iterator-models">
|
||||
<h1><a class="toc-backref" href="#id4"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> models</a></h1>
|
||||
<p>The concepts that <tt class="docutils literal"><span class="pre">filter_iterator</span></tt> models are dependent on which
|
||||
concepts the <tt class="docutils literal"><span class="pre">Iterator</span></tt> argument models, as specified in the
|
||||
following tables.</p>
|
||||
@ -480,8 +198,8 @@ following tables.</p>
|
||||
<p><tt class="docutils literal"><span class="pre">filter_iterator<P1,</span> <span class="pre">X></span></tt> is interoperable with <tt class="docutils literal"><span class="pre">filter_iterator<P2,</span> <span class="pre">Y></span></tt>
|
||||
if and only if <tt class="docutils literal"><span class="pre">X</span></tt> is interoperable with <tt class="docutils literal"><span class="pre">Y</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id5" id="filter-iterator-operations" name="filter-iterator-operations"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> operations</a></h1>
|
||||
<div class="section" id="filter-iterator-operations">
|
||||
<h1><a class="toc-backref" href="#id5"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt> operations</a></h1>
|
||||
<p>In addition to those operations required by the concepts that
|
||||
<tt class="docutils literal"><span class="pre">filter_iterator</span></tt> models, <tt class="docutils literal"><span class="pre">filter_iterator</span></tt> provides the following
|
||||
operations.</p>
|
||||
@ -622,8 +340,8 @@ make_filter_iterator(Iterator x, Iterator end = Iterator());
|
||||
<!-- Software License, Version 1.0. (See accompanying -->
|
||||
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id6" id="example" name="example">Example</a></h1>
|
||||
<div class="section" id="example">
|
||||
<h1><a class="toc-backref" href="#id6">Example</a></h1>
|
||||
<p>This example uses <tt class="docutils literal"><span class="pre">filter_iterator</span></tt> and then
|
||||
<tt class="docutils literal"><span class="pre">make_filter_iterator</span></tt> to output only the positive integers from an
|
||||
array of integers. Then <tt class="docutils literal"><span class="pre">make_filter_iterator</span></tt> is is used to output
|
||||
@ -682,8 +400,14 @@ int main()
|
||||
4 5 8
|
||||
0 -1 4 5 8
|
||||
</pre>
|
||||
<p>The source code for this example can be found <a class="reference" href="../example/filter_iterator_example.cpp">here</a>.</p>
|
||||
<p>The source code for this example can be found <a class="reference external" href="../example/filter_iterator_example.cpp">here</a>.</p>
|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="filter_iterator.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
0
doc/filter_iterator.pdf
Executable file → Normal file
0
doc/filter_iterator.pdf
Executable file → Normal file
142
doc/function_input_iterator.html
Normal file
142
doc/function_input_iterator.html
Normal file
@ -0,0 +1,142 @@
|
||||
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|
||||
<meta name="generator" content="Docutils 0.6: http://docutils.sourceforge.net/" />
|
||||
<title></title>
|
||||
<meta name="author" content="Dean Michael Berris" />
|
||||
<link rel="stylesheet" href="../../../rst.css" type="text/css" />
|
||||
</head>
|
||||
<body>
|
||||
<div class="document">
|
||||
|
||||
<table class="docinfo" frame="void" rules="none">
|
||||
<col class="docinfo-name" />
|
||||
<col class="docinfo-content" />
|
||||
<tbody valign="top">
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td><a class="first reference external" href="mailto:mikhailberis@gmail.com">Dean Michael Berris</a></td></tr>
|
||||
<tr class="field"><th class="docinfo-name">License:</th><td class="field-body">Distributed under the Boost Software License, Version 1.0
|
||||
(See accompanying file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="section" id="function-input-iterator">
|
||||
<h1>Function Input Iterator</h1>
|
||||
<p>The Function Input Iterator allows for creating iterators that encapsulate
|
||||
a nullary function object and a state object which tracks the number of times
|
||||
the iterator has been incremented. A Function Input Iterator models the
|
||||
<a class="reference external" href="http://www.sgi.com/tech/stl/InputIterator.html">InputIterator</a> concept and is useful for creating bounded input iterators.</p>
|
||||
<p>Like the Generator Iterator, the Function Input Iterator takes a function
|
||||
that models the <a class="reference external" href="http://www.sgi.com/tech/stl/Generator.html">Generator</a> concept (which is basically a nullary or 0-arity
|
||||
function object). Each increment of the function Function Input Iterator
|
||||
invokes the generator function and stores the value in the iterator. When
|
||||
the iterator is dereferenced the stored value is returned.</p>
|
||||
<p>The Function Input Iterator encapsulates a state object which models the
|
||||
<a class="reference internal" href="#incrementable-concept">Incrementable Concept</a> and the <a class="reference external" href="http://www.sgi.com/tech/stl/EqualityComparable.html">EqualityComparable</a> Concept. These concepts are
|
||||
described below as:</p>
|
||||
<div class="section" id="incrementable-concept">
|
||||
<h2>Incrementable Concept</h2>
|
||||
<p>A type models the Incrementable Concept when it supports the pre- and post-
|
||||
increment operators. For a given object <tt class="docutils literal"><span class="pre">i</span></tt> with type <tt class="docutils literal"><span class="pre">I</span></tt>, the following
|
||||
constructs should be valid:</p>
|
||||
<table border="1" class="docutils">
|
||||
<colgroup>
|
||||
<col width="24%" />
|
||||
<col width="46%" />
|
||||
<col width="30%" />
|
||||
</colgroup>
|
||||
<tbody valign="top">
|
||||
<tr><td colspan="3">Construct Description Return Type</td>
|
||||
</tr>
|
||||
<tr><td>i++</td>
|
||||
<td>Post-increment i.</td>
|
||||
<td>I</td>
|
||||
</tr>
|
||||
<tr><td>++i</td>
|
||||
<td>Pre-increment i.</td>
|
||||
<td>I&</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<p>NOTE: An Incrementable type should also be <a class="reference external" href="http://www.sgi.com/tech/stl/DefaultConstructible.html">DefaultConstructible</a>.</p>
|
||||
</div>
|
||||
<div class="section" id="synopsis">
|
||||
<h2>Synopsis</h2>
|
||||
<pre class="literal-block">
|
||||
namespace {
|
||||
template <class Function, class State>
|
||||
class function_input_iterator;
|
||||
|
||||
template <class Function, class State>
|
||||
typename function_input_iterator<Function, State>
|
||||
make_function_input_iterator(Function & f);
|
||||
|
||||
struct infinite;
|
||||
}
|
||||
</pre>
|
||||
</div>
|
||||
<div class="section" id="function-input-iterator-class">
|
||||
<h2>Function Input Iterator Class</h2>
|
||||
<p>The class Function Input Iterator class takes two template parameters
|
||||
<tt class="docutils literal"><span class="pre">Function</span></tt> and <tt class="docutils literal"><span class="pre">State</span></tt>. These two template parameters tell the
|
||||
Function Input Iterator the type of the function to encapsulate and
|
||||
the type of the internal state value to hold.</p>
|
||||
<p>The <tt class="docutils literal"><span class="pre">State</span></tt> parameter is important in cases where you want to
|
||||
control the type of the counter which determines whether two iterators
|
||||
are at the same state. This allows for creating a pair of iterators which
|
||||
bound the range of the invocations of the encapsulated functions.</p>
|
||||
</div>
|
||||
<div class="section" id="examples">
|
||||
<h2>Examples</h2>
|
||||
<p>The following example shows how we use the function input iterator class
|
||||
in cases where we want to create bounded (lazy) generated ranges.</p>
|
||||
<pre class="literal-block">
|
||||
struct generator {
|
||||
typedef int result_type;
|
||||
generator() { srand(time(0)); }
|
||||
result_type operator() () const {
|
||||
return rand();
|
||||
}
|
||||
};
|
||||
|
||||
int main(int argc, char * argv[]) {
|
||||
generator f;
|
||||
copy(
|
||||
make_function_input_iterator(f, 0),
|
||||
make_function_input_iterator(f, 10),
|
||||
ostream_iterator<int>(cout, " ")
|
||||
);
|
||||
return 0;
|
||||
}
|
||||
</pre>
|
||||
<p>Here we can see that we've bounded the number of invocations using an <tt class="docutils literal"><span class="pre">int</span></tt>
|
||||
that counts from <tt class="docutils literal"><span class="pre">0</span></tt> to <tt class="docutils literal"><span class="pre">10</span></tt>. Say we want to create an endless stream
|
||||
of random numbers and encapsulate that in a pair of integers, we can do
|
||||
it with the <tt class="docutils literal"><span class="pre">boost::infinite</span></tt> helper class.</p>
|
||||
<pre class="literal-block">
|
||||
copy(
|
||||
make_function_input_iterator(f,infinite()),
|
||||
make_function_input_iterator(f,infinite()),
|
||||
ostream_iterator<int>(count, " ")
|
||||
);
|
||||
</pre>
|
||||
<p>Above, instead of creating a huge vector we rely on the STL copy algorithm
|
||||
to traverse the function input iterator and call the function object f
|
||||
as it increments the iterator. The special property of <tt class="docutils literal"><span class="pre">boost::infinite</span></tt>
|
||||
is that equating two instances always yield false -- and that incrementing
|
||||
an instance of <tt class="docutils literal"><span class="pre">boost::infinite</span></tt> doesn't do anything. This is an efficient
|
||||
way of stating that the iterator range provided by two iterators with an
|
||||
encapsulated infinite state will definitely be infinite.</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="function_input_iterator.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
132
doc/function_input_iterator.rst
Normal file
132
doc/function_input_iterator.rst
Normal file
@ -0,0 +1,132 @@
|
||||
:Author:
|
||||
`Dean Michael Berris <mailto:me@deanberris.com>`_
|
||||
|
||||
: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)
|
||||
|
||||
:Copyright:
|
||||
Copyright 2012 Google, Inc.
|
||||
|
||||
Function Input Iterator
|
||||
=======================
|
||||
|
||||
The Function Input Iterator allows for creating iterators that encapsulate
|
||||
a nullary function object and a state object which tracks the number of times
|
||||
the iterator has been incremented. A Function Input Iterator models the
|
||||
`InputIterator`_ concept and is useful for creating bounded input iterators.
|
||||
|
||||
.. _InputIterator: http://www.sgi.com/tech/stl/InputIterator.html
|
||||
|
||||
The Function Input Iterator takes a function that models the Generator_ concept
|
||||
(which is basically a nullary or 0-arity function object). The first dereference
|
||||
of the iterator at a given position invokes the generator function and stores
|
||||
and returns the result; subsequent dereferences at the same position simply
|
||||
return the same stored result. Incrementing the iterator places it at a new
|
||||
position, hence a subsequent dereference will generate a new value via another
|
||||
invokation of the generator function. This ensures the generator function is
|
||||
invoked precisely when the iterator is requested to return a (new) value.
|
||||
|
||||
.. _Generator: http://www.sgi.com/tech/stl/Generator.html
|
||||
|
||||
The Function Input Iterator encapsulates a state object which models the
|
||||
`Incrementable Concept`_ and the EqualityComparable_ Concept. These concepts are
|
||||
described below as:
|
||||
|
||||
.. _EqualityComparable: http://www.sgi.com/tech/stl/EqualityComparable.html
|
||||
|
||||
Incrementable Concept
|
||||
---------------------
|
||||
|
||||
A type models the Incrementable Concept when it supports the pre- and post-
|
||||
increment operators. For a given object ``i`` with type ``I``, the following
|
||||
constructs should be valid:
|
||||
|
||||
========= ================= ===========
|
||||
Construct Description Return Type
|
||||
-----------------------------------------
|
||||
i++ Post-increment i. I
|
||||
++i Pre-increment i. I&
|
||||
========= ================= ===========
|
||||
|
||||
NOTE: An Incrementable type should also be DefaultConstructible_.
|
||||
|
||||
.. _DefaultConstructible: http://www.sgi.com/tech/stl/DefaultConstructible.html
|
||||
|
||||
Synopsis
|
||||
--------
|
||||
|
||||
::
|
||||
|
||||
namespace {
|
||||
template <class Function, class State>
|
||||
class function_input_iterator;
|
||||
|
||||
template <class Function, class State>
|
||||
typename function_input_iterator<Function, State>
|
||||
make_function_input_iterator(Function & f, State s);
|
||||
|
||||
struct infinite;
|
||||
}
|
||||
|
||||
Function Input Iterator Class
|
||||
-----------------------------
|
||||
|
||||
The class Function Input Iterator class takes two template parameters
|
||||
``Function`` and ``State``. These two template parameters tell the
|
||||
Function Input Iterator the type of the function to encapsulate and
|
||||
the type of the internal state value to hold.
|
||||
|
||||
The ``State`` parameter is important in cases where you want to
|
||||
control the type of the counter which determines whether two iterators
|
||||
are at the same state. This allows for creating a pair of iterators which
|
||||
bound the range of the invocations of the encapsulated functions.
|
||||
|
||||
Examples
|
||||
--------
|
||||
|
||||
The following example shows how we use the function input iterator class
|
||||
in cases where we want to create bounded (lazy) generated ranges.
|
||||
|
||||
::
|
||||
|
||||
struct generator {
|
||||
typedef int result_type;
|
||||
generator() { srand(time(0)); }
|
||||
result_type operator() () const {
|
||||
return rand();
|
||||
}
|
||||
};
|
||||
|
||||
int main(int argc, char * argv[]) {
|
||||
generator f;
|
||||
copy(
|
||||
make_function_input_iterator(f, 0),
|
||||
make_function_input_iterator(f, 10),
|
||||
ostream_iterator<int>(cout, " ")
|
||||
);
|
||||
return 0;
|
||||
}
|
||||
|
||||
Here we can see that we've bounded the number of invocations using an ``int``
|
||||
that counts from ``0`` to ``10``. Say we want to create an endless stream
|
||||
of random numbers and encapsulate that in a pair of integers, we can do
|
||||
it with the ``boost::infinite`` helper class.
|
||||
|
||||
::
|
||||
|
||||
copy(
|
||||
make_function_input_iterator(f,infinite()),
|
||||
make_function_input_iterator(f,infinite()),
|
||||
ostream_iterator<int>(cout, " ")
|
||||
);
|
||||
|
||||
Above, instead of creating a huge vector we rely on the STL copy algorithm
|
||||
to traverse the function input iterator and call the function object f
|
||||
as it increments the iterator. The special property of ``boost::infinite``
|
||||
is that equating two instances always yield false -- and that incrementing
|
||||
an instance of ``boost::infinite`` doesn't do anything. This is an efficient
|
||||
way of stating that the iterator range provided by two iterators with an
|
||||
encapsulated infinite state will definitely be infinite.
|
||||
|
||||
|
@ -3,295 +3,13 @@
|
||||
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
||||
<meta name="generator" content="Docutils 0.4: http://docutils.sourceforge.net/" />
|
||||
<meta name="generator" content="Docutils 0.5: http://docutils.sourceforge.net/" />
|
||||
<title>Function Output Iterator</title>
|
||||
<meta name="author" content="David Abrahams, Jeremy Siek, Thomas Witt" />
|
||||
<meta name="organization" content="Boost Consulting, Indiana University Open Systems Lab, University of Hanover Institute for Transport Railway Operation and Construction" />
|
||||
<meta name="date" content="2004-11-01" />
|
||||
<meta name="date" content="2006-09-11" />
|
||||
<meta name="copyright" content="Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003." />
|
||||
<style type="text/css">
|
||||
|
||||
/*
|
||||
:Author: David Goodger
|
||||
:Contact: goodger@users.sourceforge.net
|
||||
:Date: $Date$
|
||||
:Revision: $Revision$
|
||||
:Copyright: This stylesheet has been placed in the public domain.
|
||||
|
||||
Default cascading style sheet for the HTML output of Docutils.
|
||||
|
||||
See http://docutils.sf.net/docs/howto/html-stylesheets.html for how to
|
||||
customize this style sheet.
|
||||
*/
|
||||
|
||||
/* used to remove borders from tables and images */
|
||||
.borderless, table.borderless td, table.borderless th {
|
||||
border: 0 }
|
||||
|
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table.borderless td, table.borderless th {
|
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/* Override padding for "table.docutils td" with "! important".
|
||||
The right padding separates the table cells. */
|
||||
padding: 0 0.5em 0 0 ! important }
|
||||
|
||||
.first {
|
||||
/* Override more specific margin styles with "! important". */
|
||||
margin-top: 0 ! important }
|
||||
|
||||
.last, .with-subtitle {
|
||||
margin-bottom: 0 ! important }
|
||||
|
||||
.hidden {
|
||||
display: none }
|
||||
|
||||
a.toc-backref {
|
||||
text-decoration: none ;
|
||||
color: black }
|
||||
|
||||
blockquote.epigraph {
|
||||
margin: 2em 5em ; }
|
||||
|
||||
dl.docutils dd {
|
||||
margin-bottom: 0.5em }
|
||||
|
||||
/* Uncomment (and remove this text!) to get bold-faced definition list terms
|
||||
dl.docutils dt {
|
||||
font-weight: bold }
|
||||
*/
|
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|
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div.abstract {
|
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margin: 2em 5em }
|
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div.abstract p.topic-title {
|
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font-weight: bold ;
|
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text-align: center }
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div.admonition, div.attention, div.caution, div.danger, div.error,
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div.hint, div.important, div.note, div.tip, div.warning {
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div.admonition p.admonition-title, div.hint p.admonition-title,
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div.important p.admonition-title, div.note p.admonition-title,
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div.attention p.admonition-title, div.caution p.admonition-title,
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color: red ;
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font-weight: bold ;
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font-family: sans-serif }
|
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|
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/* Uncomment (and remove this text!) to get reduced vertical space in
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compound paragraphs.
|
||||
div.compound .compound-first, div.compound .compound-middle {
|
||||
margin-bottom: 0.5em }
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|
||||
div.compound .compound-last, div.compound .compound-middle {
|
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margin-top: 0.5em }
|
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*/
|
||||
|
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div.dedication {
|
||||
margin: 2em 5em ;
|
||||
text-align: center ;
|
||||
font-style: italic }
|
||||
|
||||
div.dedication p.topic-title {
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||||
font-weight: bold ;
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font-style: normal }
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||||
div.figure {
|
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margin-left: 2em ;
|
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margin-right: 2em }
|
||||
|
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div.footer, div.header {
|
||||
clear: both;
|
||||
font-size: smaller }
|
||||
|
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div.line-block {
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||||
display: block ;
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margin-top: 1em ;
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margin-bottom: 1em }
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|
||||
div.line-block div.line-block {
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div.topic {
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margin: 2em }
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h1.section-subtitle, h2.section-subtitle, h3.section-subtitle,
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hr.docutils {
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width: 75% }
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clear: left }
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|
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<body>
|
||||
<div class="document" id="function-output-iterator">
|
||||
@ -303,13 +21,13 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams, Jeremy Siek, Thomas Witt</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference external" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference external" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
Railway Operation and Construction</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.</td></tr>
|
||||
</tbody>
|
||||
@ -334,21 +52,21 @@ proxy object.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first">Table of Contents</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#header" id="id1" name="id1">Header</a></li>
|
||||
<li><a class="reference" href="#function-output-iterator-requirements" id="id2" name="id2"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference" href="#function-output-iterator-models" id="id3" name="id3"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference" href="#function-output-iterator-operations" id="id4" name="id4"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference" href="#example" id="id5" name="id5">Example</a></li>
|
||||
<li><a class="reference internal" href="#header" id="id1">Header</a></li>
|
||||
<li><a class="reference internal" href="#function-output-iterator-requirements" id="id2"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference internal" href="#function-output-iterator-models" id="id3"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference internal" href="#function-output-iterator-operations" id="id4"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference internal" href="#example" id="id5">Example</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<!-- Copyright David Abrahams 2006. 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) -->
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id1" id="header" name="header">Header</a></h1>
|
||||
<div class="section" id="header">
|
||||
<h1><a class="toc-backref" href="#id1">Header</a></h1>
|
||||
<pre class="literal-block">
|
||||
#include <boost/function_output_iterator.hpp>
|
||||
</pre>
|
||||
@ -374,17 +92,17 @@ private:
|
||||
};
|
||||
</pre>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id2" id="function-output-iterator-requirements" name="function-output-iterator-requirements"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt> requirements</a></h1>
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id3" id="function-output-iterator-models" name="function-output-iterator-models"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt> models</a></h1>
|
||||
<div class="section" id="function-output-iterator-models">
|
||||
<h1><a class="toc-backref" href="#id3"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt> models</a></h1>
|
||||
<p><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt> is a model of the Writable and
|
||||
Incrementable Iterator concepts.</p>
|
||||
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|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id4" id="function-output-iterator-operations" name="function-output-iterator-operations"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt> operations</a></h1>
|
||||
<div class="section" id="function-output-iterator-operations">
|
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|
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<p><tt class="docutils literal"><span class="pre">explicit</span> <span class="pre">function_output_iterator(const</span> <span class="pre">UnaryFunction&</span> <span class="pre">f</span> <span class="pre">=</span> <span class="pre">UnaryFunction());</span></tt></p>
|
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|
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|
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<h1><a class="toc-backref" href="#id5">Example</a></h1>
|
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|
||||
struct string_appender
|
||||
{
|
||||
@ -462,6 +180,12 @@ int main(int, char*[])
|
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}
|
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<a class="reference external" href="function_output_iterator.rst">View document source</a>.
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|
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list-style-type: none }
|
||||
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||||
</style>
|
||||
<link rel="stylesheet" href="../../../rst.css" type="text/css" />
|
||||
</head>
|
||||
<body>
|
||||
<div class="document" id="the-boost-iterator-library-logo">
|
||||
<h1 class="title">The Boost.Iterator Library <a class="reference" href="../../../index.htm"><img alt="Boost" src="../../../boost.png" /></a></h1>
|
||||
<h1 class="title">The Boost.Iterator Library <a class="reference external" href="../../../index.htm"><img alt="Boost" src="../../../boost.png" /></a></h1>
|
||||
|
||||
<!-- 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) -->
|
||||
@ -302,10 +21,10 @@ ul.auto-toc {
|
||||
<tbody valign="top">
|
||||
<tr class="field"><th class="field-name">Authors:</th><td class="field-body">David Abrahams, Jeremy Siek, Thomas Witt</td>
|
||||
</tr>
|
||||
<tr class="field"><th class="field-name">Contact:</th><td class="field-body"><a class="reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="reference" href="mailto:witt@styleadvisor.com">witt@styleadvisor.com</a></td>
|
||||
<tr class="field"><th class="field-name">Contact:</th><td class="field-body"><a class="reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="reference external" href="mailto:witt@styleadvisor.com">witt@styleadvisor.com</a></td>
|
||||
</tr>
|
||||
<tr class="field"><th class="field-name">organizations:</th><td class="field-body"><a class="reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, <a class="reference" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td>
|
||||
<tr class="field"><th class="field-name">organizations:</th><td class="field-body"><a class="reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, <a class="reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td>
|
||||
</tr>
|
||||
<tr class="field"><th class="field-name">date:</th><td class="field-body">$Date$</td>
|
||||
</tr>
|
||||
@ -318,7 +37,7 @@ Lab</a>, <a class="reference" href="http://www.styleadvisor.com">Zephyr Associat
|
||||
<col class="field-body" />
|
||||
<tbody valign="top">
|
||||
<tr class="field"><th class="field-name">Abstract:</th><td class="field-body">The Boost Iterator Library contains two parts. The first
|
||||
is a system of <a class="reference" href="../../../more/generic_programming.html#concept">concepts</a> which extend the C++ standard
|
||||
is a system of <a class="reference external" href="http://www.boost.org/more/generic_programming.html#concept">concepts</a> which extend the C++ standard
|
||||
iterator requirements. The second is a framework of
|
||||
components for building iterators based on these
|
||||
extended concepts and includes several useful iterator
|
||||
@ -335,24 +54,24 @@ older Boost Iterator Adaptor Library.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents"><strong>Table of Contents</strong></a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first"><strong>Table of Contents</strong></p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#new-style-iterators" id="id22" name="id22">New-Style Iterators</a></li>
|
||||
<li><a class="reference" href="#iterator-facade-and-adaptor" id="id23" name="id23">Iterator Facade and Adaptor</a></li>
|
||||
<li><a class="reference" href="#specialized-adaptors" id="id24" name="id24">Specialized Adaptors</a></li>
|
||||
<li><a class="reference" href="#iterator-utilities" id="id25" name="id25">Iterator Utilities</a><ul>
|
||||
<li><a class="reference" href="#traits" id="id26" name="id26">Traits</a></li>
|
||||
<li><a class="reference" href="#testing-and-concept-checking" id="id27" name="id27">Testing and Concept Checking</a></li>
|
||||
<li><a class="reference internal" href="#new-style-iterators" id="id23">New-Style Iterators</a></li>
|
||||
<li><a class="reference internal" href="#iterator-facade-and-adaptor" id="id24">Iterator Facade and Adaptor</a></li>
|
||||
<li><a class="reference internal" href="#specialized-adaptors" id="id25">Specialized Adaptors</a></li>
|
||||
<li><a class="reference internal" href="#iterator-utilities" id="id26">Iterator Utilities</a><ul>
|
||||
<li><a class="reference internal" href="#traits" id="id27">Traits</a></li>
|
||||
<li><a class="reference internal" href="#testing-and-concept-checking" id="id28">Testing and Concept Checking</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#upgrading-from-the-old-boost-iterator-adaptor-library" id="id28" name="id28">Upgrading from the old Boost Iterator Adaptor Library</a></li>
|
||||
<li><a class="reference" href="#history" id="id29" name="id29">History</a></li>
|
||||
<li><a class="reference internal" href="#upgrading-from-the-old-boost-iterator-adaptor-library" id="id29">Upgrading from the old Boost Iterator Adaptor Library</a></li>
|
||||
<li><a class="reference internal" href="#history" id="id30">History</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<hr class="docutils" />
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id22" id="new-style-iterators" name="new-style-iterators">New-Style Iterators</a></h1>
|
||||
<div class="section" id="new-style-iterators">
|
||||
<h1><a class="toc-backref" href="#id23">New-Style Iterators</a></h1>
|
||||
<p>The iterator categories defined in C++98 are extremely limiting
|
||||
because they bind together two orthogonal concepts: traversal and
|
||||
element access. For example, because a random access iterator is
|
||||
@ -361,17 +80,17 @@ it is impossible to capture the capabilities of
|
||||
<tt class="docutils literal"><span class="pre">vector<bool>::iterator</span></tt> using the C++98 categories. This is the
|
||||
infamous "<tt class="docutils literal"><span class="pre">vector<bool></span></tt> is not a container, and its iterators
|
||||
aren't random access iterators", debacle about which Herb Sutter
|
||||
wrote two papers for the standards comittee (<a class="reference" href="http://www.gotw.ca/publications/N1185.pdf">n1185</a> and <a class="reference" href="http://www.gotw.ca/publications/N1211.pdf">n1211</a>),
|
||||
and a <a class="reference" href="http://www.gotw.ca/gotw/050.htm">Guru of the Week</a>. New-style iterators go well beyond
|
||||
wrote two papers for the standards comittee (<a class="reference external" href="http://www.gotw.ca/publications/N1185.pdf">n1185</a> and <a class="reference external" href="http://www.gotw.ca/publications/N1211.pdf">n1211</a>),
|
||||
and a <a class="reference external" href="http://www.gotw.ca/gotw/050.htm">Guru of the Week</a>. New-style iterators go well beyond
|
||||
patching up <tt class="docutils literal"><span class="pre">vector<bool></span></tt>, though: there are lots of other
|
||||
iterators already in use which can't be adequately represented by
|
||||
the existing concepts. For details about the new iterator
|
||||
concepts, see our</p>
|
||||
<blockquote>
|
||||
<a class="reference" href="new-iter-concepts.html">Standard Proposal For New-Style Iterators</a> (<a class="reference" href="new-iter-concepts.pdf">PDF</a>)</blockquote>
|
||||
<a class="reference external" href="new-iter-concepts.html">Standard Proposal For New-Style Iterators</a> (<a class="reference external" href="new-iter-concepts.pdf">PDF</a>)</blockquote>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id23" id="iterator-facade-and-adaptor" name="iterator-facade-and-adaptor">Iterator Facade and Adaptor</a></h1>
|
||||
<div class="section" id="iterator-facade-and-adaptor">
|
||||
<h1><a class="toc-backref" href="#id24">Iterator Facade and Adaptor</a></h1>
|
||||
<p>Writing standard-conforming iterators is tricky, but the need comes
|
||||
up often. In order to ease the implementation of new iterators,
|
||||
the Boost.Iterator library provides the <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> class template,
|
||||
@ -387,54 +106,57 @@ behavior as possible.</p>
|
||||
<p>The documentation for these two classes can be found at the following
|
||||
web pages:</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="iterator_facade.html"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt></a> (<a class="reference" href="iterator_facade.pdf">PDF</a>)</li>
|
||||
<li><a class="reference" href="iterator_adaptor.html"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt></a> (<a class="reference" href="iterator_adaptor.pdf">PDF</a>)</li>
|
||||
<li><a class="reference external" href="iterator_facade.html"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt></a> (<a class="reference external" href="iterator_facade.pdf">PDF</a>)</li>
|
||||
<li><a class="reference external" href="iterator_adaptor.html"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt></a> (<a class="reference external" href="iterator_adaptor.pdf">PDF</a>)</li>
|
||||
</ul>
|
||||
<p>Both <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> and <tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> as well as many of the <a class="reference" href="#specialized-adaptors">specialized
|
||||
<p>Both <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> and <tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> as well as many of the <a class="reference internal" href="#specialized-adaptors">specialized
|
||||
adaptors</a> mentioned below have been proposed for standardization,
|
||||
and accepted into the first C++ technical report; see our</p>
|
||||
<blockquote>
|
||||
<a class="reference" href="facade-and-adaptor.html">Standard Proposal For Iterator Facade and Adaptor</a> (<a class="reference" href="facade-and-adaptor.pdf">PDF</a>)</blockquote>
|
||||
<a class="reference external" href="facade-and-adaptor.html">Standard Proposal For Iterator Facade and Adaptor</a> (<a class="reference external" href="facade-and-adaptor.pdf">PDF</a>)</blockquote>
|
||||
<p>for more details.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id24" id="specialized-adaptors" name="specialized-adaptors">Specialized Adaptors</a></h1>
|
||||
<div class="section" id="specialized-adaptors">
|
||||
<h1><a class="toc-backref" href="#id25">Specialized Adaptors</a></h1>
|
||||
<p>The iterator library supplies a useful suite of standard-conforming
|
||||
iterator templates based on the Boost <a class="reference" href="#iterator-facade-and-adaptor">iterator facade and adaptor</a>.</p>
|
||||
iterator templates based on the Boost <a class="reference internal" href="#iterator-facade-and-adaptor">iterator facade and adaptor</a>.</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="counting_iterator.html"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt></a> (<a class="reference" href="counting_iterator.pdf">PDF</a>): an iterator over a sequence of consecutive values.
|
||||
<li><a class="reference external" href="counting_iterator.html"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt></a> (<a class="reference external" href="counting_iterator.pdf">PDF</a>): an iterator over a sequence of consecutive values.
|
||||
Implements a "lazy sequence"</li>
|
||||
<li><a class="reference" href="filter_iterator.html"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt></a> (<a class="reference" href="filter_iterator.pdf">PDF</a>): an iterator over the subset of elements of some
|
||||
<li><a class="reference external" href="filter_iterator.html"><tt class="docutils literal"><span class="pre">filter_iterator</span></tt></a> (<a class="reference external" href="filter_iterator.pdf">PDF</a>): an iterator over the subset of elements of some
|
||||
sequence which satisfy a given predicate</li>
|
||||
<li><a class="reference" href="function_output_iterator.html"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt></a> (<a class="reference" href="function_output_iterator.pdf">PDF</a>): an output iterator wrapping a unary function
|
||||
<li><a class="reference external" href="function_input_iterator.html"><tt class="docutils literal"><span class="pre">function_input_iterator</span></tt></a> (<a class="reference external" href="function_input_iterator.pdf">PDF</a>): an input iterator wrapping a generator (nullary
|
||||
function object); each time the iterator is dereferenced, the function object
|
||||
is called to get the value to return.</li>
|
||||
<li><a class="reference external" href="function_output_iterator.html"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt></a> (<a class="reference external" href="function_output_iterator.pdf">PDF</a>): an output iterator wrapping a unary function
|
||||
object; each time an element is written into the dereferenced
|
||||
iterator, it is passed as a parameter to the function object.</li>
|
||||
<li><a class="reference" href="indirect_iterator.html"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt></a> (<a class="reference" href="indirect_iterator.pdf">PDF</a>): an iterator over the objects <em>pointed-to</em> by the
|
||||
<li><a class="reference external" href="indirect_iterator.html"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt></a> (<a class="reference external" href="indirect_iterator.pdf">PDF</a>): an iterator over the objects <em>pointed-to</em> by the
|
||||
elements of some sequence.</li>
|
||||
<li><a class="reference" href="permutation_iterator.html"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt></a> (<a class="reference" href="permutation_iterator.pdf">PDF</a>): an iterator over the elements of some random-access
|
||||
<li><a class="reference external" href="permutation_iterator.html"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt></a> (<a class="reference external" href="permutation_iterator.pdf">PDF</a>): an iterator over the elements of some random-access
|
||||
sequence, rearranged according to some sequence of integer indices.</li>
|
||||
<li><a class="reference" href="reverse_iterator.html"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt></a> (<a class="reference" href="reverse_iterator.pdf">PDF</a>): an iterator which traverses the elements of some
|
||||
<li><a class="reference external" href="reverse_iterator.html"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt></a> (<a class="reference external" href="reverse_iterator.pdf">PDF</a>): an iterator which traverses the elements of some
|
||||
bidirectional sequence in reverse. Corrects many of the
|
||||
shortcomings of C++98's <tt class="docutils literal"><span class="pre">std::reverse_iterator</span></tt>.</li>
|
||||
<li><a class="reference" href="../../utility/shared_container_iterator.html"><tt class="docutils literal"><span class="pre">shared_container_iterator</span></tt></a>: an iterator over elements of a container whose
|
||||
lifetime is maintained by a <a class="reference" href="../../smart_ptr/shared_ptr.htm"><tt class="docutils literal"><span class="pre">shared_ptr</span></tt></a> stored in the iterator.</li>
|
||||
<li><a class="reference" href="transform_iterator.html"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt></a> (<a class="reference" href="transform_iterator.pdf">PDF</a>): an iterator over elements which are the result of
|
||||
<li><a class="reference external" href="../../utility/shared_container_iterator.html"><tt class="docutils literal"><span class="pre">shared_container_iterator</span></tt></a>: an iterator over elements of a container whose
|
||||
lifetime is maintained by a <a class="reference external" href="../../smart_ptr/shared_ptr.htm"><tt class="docutils literal"><span class="pre">shared_ptr</span></tt></a> stored in the iterator.</li>
|
||||
<li><a class="reference external" href="transform_iterator.html"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt></a> (<a class="reference external" href="transform_iterator.pdf">PDF</a>): an iterator over elements which are the result of
|
||||
applying some functional transformation to the elements of an
|
||||
underlying sequence. This component also replaces the old
|
||||
<tt class="docutils literal"><span class="pre">projection_iterator_adaptor</span></tt>.</li>
|
||||
<li><a class="reference" href="zip_iterator.html"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt></a> (<a class="reference" href="zip_iterator.pdf">PDF</a>): an iterator over tuples of the elements at corresponding
|
||||
<li><a class="reference external" href="zip_iterator.html"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt></a> (<a class="reference external" href="zip_iterator.pdf">PDF</a>): an iterator over tuples of the elements at corresponding
|
||||
positions of heterogeneous underlying iterators.</li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id25" id="iterator-utilities" name="iterator-utilities">Iterator Utilities</a></h1>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id26" id="traits" name="traits">Traits</a></h2>
|
||||
<div class="section" id="iterator-utilities">
|
||||
<h1><a class="toc-backref" href="#id26">Iterator Utilities</a></h1>
|
||||
<div class="section" id="traits">
|
||||
<h2><a class="toc-backref" href="#id27">Traits</a></h2>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="pointee.html"><tt class="docutils literal"><span class="pre">pointee.hpp</span></tt></a> (<a class="reference" href="pointee.pdf">PDF</a>): Provides the capability to deduce the referent types
|
||||
<li><a class="reference external" href="pointee.html"><tt class="docutils literal"><span class="pre">pointee.hpp</span></tt></a> (<a class="reference external" href="pointee.pdf">PDF</a>): Provides the capability to deduce the referent types
|
||||
of pointers, smart pointers and iterators in generic code. Used
|
||||
in <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt>.</li>
|
||||
<li><a class="reference" href="iterator_traits.html"><tt class="docutils literal"><span class="pre">iterator_traits.hpp</span></tt></a> (<a class="reference" href="iterator_traits.pdf">PDF</a>): Provides <a class="reference" href="../../mpl/doc/index.html">MPL</a>-compatible metafunctions which
|
||||
<li><a class="reference external" href="iterator_traits.html"><tt class="docutils literal"><span class="pre">iterator_traits.hpp</span></tt></a> (<a class="reference external" href="iterator_traits.pdf">PDF</a>): Provides <a class="reference external" href="../../mpl/doc/index.html">MPL</a>-compatible metafunctions which
|
||||
retrieve an iterator's traits. Also corrects for the deficiencies
|
||||
of broken implementations of <tt class="docutils literal"><span class="pre">std::iterator_traits</span></tt>.</li>
|
||||
</ul>
|
||||
@ -442,26 +164,26 @@ of broken implementations of <tt class="docutils literal"><span class="pre">std:
|
||||
testing iterator interoperability -->
|
||||
<!-- comment! __ interoperable.pdf -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id27" id="testing-and-concept-checking" name="testing-and-concept-checking">Testing and Concept Checking</a></h2>
|
||||
<div class="section" id="testing-and-concept-checking">
|
||||
<h2><a class="toc-backref" href="#id28">Testing and Concept Checking</a></h2>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="iterator_concepts.html"><tt class="docutils literal"><span class="pre">iterator_concepts.hpp</span></tt></a> (<a class="reference" href="iterator_concepts.pdf">PDF</a>): Concept checking classes for the new iterator concepts.</li>
|
||||
<li><a class="reference" href="iterator_archetypes.html"><tt class="docutils literal"><span class="pre">iterator_archetypes.hpp</span></tt></a> (<a class="reference" href="iterator_archetypes.pdf">PDF</a>): Concept archetype classes for the new iterators concepts.</li>
|
||||
<li><a class="reference external" href="iterator_concepts.html"><tt class="docutils literal"><span class="pre">iterator_concepts.hpp</span></tt></a> (<a class="reference external" href="iterator_concepts.pdf">PDF</a>): Concept checking classes for the new iterator concepts.</li>
|
||||
<li><a class="reference external" href="iterator_archetypes.html"><tt class="docutils literal"><span class="pre">iterator_archetypes.hpp</span></tt></a> (<a class="reference external" href="iterator_archetypes.pdf">PDF</a>): Concept archetype classes for the new iterators concepts.</li>
|
||||
</ul>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id28" id="upgrading-from-the-old-boost-iterator-adaptor-library" name="upgrading-from-the-old-boost-iterator-adaptor-library">Upgrading from the old Boost Iterator Adaptor Library</a></h1>
|
||||
<div class="section" id="upgrading-from-the-old-boost-iterator-adaptor-library">
|
||||
<h1><a class="toc-backref" href="#id29">Upgrading from the old Boost Iterator Adaptor Library</a></h1>
|
||||
<p id="upgrading">If you have been using the old Boost Iterator Adaptor library to
|
||||
implement iterators, you probably wrote a <tt class="docutils literal"><span class="pre">Policies</span></tt> class which
|
||||
captures the core operations of your iterator. In the new library
|
||||
design, you'll move those same core operations into the body of the
|
||||
iterator class itself. If you were writing a family of iterators,
|
||||
you probably wrote a <a class="reference" href="../../../more/generic_programming.html#type_generator">type generator</a> to build the
|
||||
you probably wrote a <a class="reference external" href="http://www.boost.org/more/generic_programming.html#type_generator">type generator</a> to build the
|
||||
<tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> specialization you needed; in the new library
|
||||
design you don't need a type generator (though may want to keep it
|
||||
around as a compatibility aid for older code) because, due to the
|
||||
use of the Curiously Recurring Template Pattern (CRTP) <a class="citation-reference" href="#cop95" id="id21" name="id21">[Cop95]</a>,
|
||||
use of the Curiously Recurring Template Pattern (CRTP) <a class="citation-reference" href="#cop95" id="id22">[Cop95]</a>,
|
||||
you can now define the iterator class yourself and acquire
|
||||
functionality through inheritance from <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> or
|
||||
<tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt>. As a result, you also get much finer control
|
||||
@ -475,8 +197,8 @@ template argument, if explicitly specified) is a true reference
|
||||
type, <tt class="docutils literal"><span class="pre">transform_iterator</span></tt> will behave like
|
||||
<tt class="docutils literal"><span class="pre">projection_iterator</span></tt> used to.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id29" id="history" name="history">History</a></h1>
|
||||
<div class="section" id="history">
|
||||
<h1><a class="toc-backref" href="#id30">History</a></h1>
|
||||
<p>In 2000 Dave Abrahams was writing an iterator for a container of
|
||||
pointers, which would access the pointed-to elements when
|
||||
dereferenced. Naturally, being a library writer, he decided to
|
||||
@ -504,7 +226,7 @@ library you see today.</p>
|
||||
<table class="docutils citation" frame="void" id="cop95" rules="none">
|
||||
<colgroup><col class="label" /><col /></colgroup>
|
||||
<tbody valign="top">
|
||||
<tr><td class="label"><a class="fn-backref" href="#id21" name="cop95">[Cop95]</a></td><td>[Coplien, 1995] Coplien, J., Curiously Recurring Template
|
||||
<tr><td class="label"><a class="fn-backref" href="#id22">[Cop95]</a></td><td>[Coplien, 1995] Coplien, J., Curiously Recurring Template
|
||||
Patterns, C++ Report, February 1995, pp. 24-27.</td></tr>
|
||||
</tbody>
|
||||
</table>
|
||||
@ -516,6 +238,12 @@ LocalWords: RandomAccessTraversalIterator dereferenceable Incrementable tmp
|
||||
LocalWords: incrementable xxx min prev inplace png oldeqnew AccessTag struct
|
||||
LocalWords: TraversalTag typename lvalues DWA Hmm JGS -->
|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="index.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
18
doc/index.rst
Executable file → Normal file
18
doc/index.rst
Executable file → Normal file
@ -43,7 +43,7 @@ __ ../../../index.htm
|
||||
The components of the Boost Iterator Library replace the
|
||||
older Boost Iterator Adaptor Library.
|
||||
|
||||
.. _concepts: ../../../more/generic_programming.html#concept
|
||||
.. _concepts: http://www.boost.org/more/generic_programming.html#concept
|
||||
|
||||
.. contents:: **Table of Contents**
|
||||
|
||||
@ -138,7 +138,11 @@ iterator templates based on the Boost `iterator facade and adaptor`_.
|
||||
* |filter|_ (PDF__): an iterator over the subset of elements of some
|
||||
sequence which satisfy a given predicate
|
||||
|
||||
* |function|_ (PDF__): an output iterator wrapping a unary function
|
||||
* |function_input|_ (PDF__): an input iterator wrapping a generator (nullary
|
||||
function object); each time the iterator is dereferenced, the function object
|
||||
is called to get the value to return.
|
||||
|
||||
* |function_output|_ (PDF__): an output iterator wrapping a unary function
|
||||
object; each time an element is written into the dereferenced
|
||||
iterator, it is passed as a parameter to the function object.
|
||||
|
||||
@ -171,8 +175,12 @@ __ counting_iterator.pdf
|
||||
.. _filter: filter_iterator.html
|
||||
__ filter_iterator.pdf
|
||||
|
||||
.. |function| replace:: ``function_output_iterator``
|
||||
.. _function: function_output_iterator.html
|
||||
.. |function_input| replace:: ``function_input_iterator``
|
||||
.. _function_input: function_input_iterator.html
|
||||
__ function_input_iterator.pdf
|
||||
|
||||
.. |function_output| replace:: ``function_output_iterator``
|
||||
.. _function_output: function_output_iterator.html
|
||||
__ function_output_iterator.pdf
|
||||
|
||||
.. |indirect| replace:: ``indirect_iterator``
|
||||
@ -271,7 +279,7 @@ over how your iterator works: you can add additional constructors,
|
||||
or even override the iterator functionality provided by the
|
||||
library.
|
||||
|
||||
.. _`type generator`: ../../../more/generic_programming.html#type_generator
|
||||
.. _`type generator`: http://www.boost.org/more/generic_programming.html#type_generator
|
||||
|
||||
If you're looking for the old ``projection_iterator`` component,
|
||||
its functionality has been merged into ``transform_iterator``: as
|
||||
|
@ -3,295 +3,13 @@
|
||||
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
||||
<head>
|
||||
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|
||||
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|
||||
<meta name="generator" content="Docutils 0.5: http://docutils.sourceforge.net/" />
|
||||
<title>Indirect Iterator</title>
|
||||
<meta name="author" content="David Abrahams, Jeremy Siek, Thomas Witt" />
|
||||
<meta name="organization" content="Boost Consulting, Indiana University Open Systems Lab, University of Hanover Institute for Transport Railway Operation and Construction" />
|
||||
<meta name="date" content="2004-11-01" />
|
||||
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|
||||
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|
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|
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|
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|
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|
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|
||||
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|
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|
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|
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<link rel="stylesheet" href="../../../rst.css" type="text/css" />
|
||||
</head>
|
||||
<body>
|
||||
<div class="document" id="indirect-iterator">
|
||||
@ -303,13 +21,13 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams, Jeremy Siek, Thomas Witt</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference external" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference external" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
Railway Operation and Construction</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.</td></tr>
|
||||
</tbody>
|
||||
@ -335,18 +53,18 @@ not an iterator.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first">Table of Contents</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#indirect-iterator-synopsis" id="id2" name="id2"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> synopsis</a></li>
|
||||
<li><a class="reference" href="#indirect-iterator-requirements" id="id3" name="id3"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference" href="#indirect-iterator-models" id="id4" name="id4"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference" href="#indirect-iterator-operations" id="id5" name="id5"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference" href="#example" id="id6" name="id6">Example</a></li>
|
||||
<li><a class="reference internal" href="#indirect-iterator-synopsis" id="id2"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> synopsis</a></li>
|
||||
<li><a class="reference internal" href="#indirect-iterator-requirements" id="id3"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference internal" href="#indirect-iterator-models" id="id4"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference internal" href="#indirect-iterator-operations" id="id5"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference internal" href="#example" id="id6">Example</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id2" id="indirect-iterator-synopsis" name="indirect-iterator-synopsis"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> synopsis</a></h1>
|
||||
<div class="section" id="indirect-iterator-synopsis">
|
||||
<h1><a class="toc-backref" href="#id2"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> synopsis</a></h1>
|
||||
<!-- Copyright David Abrahams 2006. 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) -->
|
||||
@ -426,8 +144,8 @@ else
|
||||
) iterator_category;
|
||||
</pre>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id3" id="indirect-iterator-requirements" name="indirect-iterator-requirements"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> requirements</a></h1>
|
||||
<div class="section" id="indirect-iterator-requirements">
|
||||
<h1><a class="toc-backref" href="#id3"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> requirements</a></h1>
|
||||
<p>The expression <tt class="docutils literal"><span class="pre">*v</span></tt>, where <tt class="docutils literal"><span class="pre">v</span></tt> is an object of
|
||||
<tt class="docutils literal"><span class="pre">iterator_traits<Iterator>::value_type</span></tt>, shall be valid
|
||||
expression and convertible to <tt class="docutils literal"><span class="pre">reference</span></tt>. <tt class="docutils literal"><span class="pre">Iterator</span></tt> shall
|
||||
@ -440,8 +158,8 @@ the requirements indicated by <tt class="docutils literal"><span class="pre">ite
|
||||
parameter is not <tt class="docutils literal"><span class="pre">use_default</span></tt>, as implied by the algorithm for
|
||||
deducing the default for the <tt class="docutils literal"><span class="pre">value_type</span></tt> member.]</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id4" id="indirect-iterator-models" name="indirect-iterator-models"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> models</a></h1>
|
||||
<div class="section" id="indirect-iterator-models">
|
||||
<h1><a class="toc-backref" href="#id4"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> models</a></h1>
|
||||
<p>In addition to the concepts indicated by <tt class="docutils literal"><span class="pre">iterator_category</span></tt>
|
||||
and by <tt class="docutils literal"><span class="pre">iterator_traversal<indirect_iterator>::type</span></tt>, a
|
||||
specialization of <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> models the following
|
||||
@ -461,8 +179,8 @@ expression (where <tt class="docutils literal"><span class="pre">t</span></tt> i
|
||||
<tt class="docutils literal"><span class="pre">indirect_iterator<Y,V2,C2,R2,D2></span></tt> if and only if <tt class="docutils literal"><span class="pre">X</span></tt> is
|
||||
interoperable with <tt class="docutils literal"><span class="pre">Y</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id5" id="indirect-iterator-operations" name="indirect-iterator-operations"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> operations</a></h1>
|
||||
<div class="section" id="indirect-iterator-operations">
|
||||
<h1><a class="toc-backref" href="#id5"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> operations</a></h1>
|
||||
<p>In addition to the operations required by the concepts described
|
||||
above, specializations of <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> provide the
|
||||
following operations.</p>
|
||||
@ -555,8 +273,8 @@ indirect_iterator(
|
||||
<!-- Software License, Version 1.0. (See accompanying -->
|
||||
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id6" id="example" name="example">Example</a></h1>
|
||||
<div class="section" id="example">
|
||||
<h1><a class="toc-backref" href="#id6">Example</a></h1>
|
||||
<p>This example prints an array of characters, using
|
||||
<tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> to access the array of characters through an
|
||||
array of pointers. Next <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> is used with the
|
||||
@ -614,8 +332,14 @@ a,b,c,d,e,f,g,
|
||||
b,c,d,e,f,g,h,
|
||||
a,b,c,d,e,f,g,
|
||||
</pre>
|
||||
<p>The source code for this example can be found <a class="reference" href="../example/indirect_iterator_example.cpp">here</a>.</p>
|
||||
<p>The source code for this example can be found <a class="reference external" href="../example/indirect_iterator_example.cpp">here</a>.</p>
|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="indirect_iterator.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
0
doc/indirect_iterator.pdf
Executable file → Normal file
0
doc/indirect_iterator.pdf
Executable file → Normal file
0
doc/indirect_reference_ref.rst
Executable file → Normal file
0
doc/indirect_reference_ref.rst
Executable file → Normal file
283
doc/interoperability-revisited.rst
Executable file → Normal file
283
doc/interoperability-revisited.rst
Executable file → Normal file
@ -18,86 +18,87 @@ implement interoperable iterators.
|
||||
In the following text a simplified example of the current iterator_facade specification is used to
|
||||
illustrate the problem.
|
||||
|
||||
In the current specification binary operators are implemented in the following way:
|
||||
In the current specification binary operators are implemented in the following way::
|
||||
|
||||
template <class Derived>
|
||||
struct Facade
|
||||
{
|
||||
};
|
||||
template <class Derived>
|
||||
struct Facade
|
||||
{
|
||||
};
|
||||
|
||||
template <class T1, T2>
|
||||
struct is_interoperable :
|
||||
or_<
|
||||
is_convertible<T1, T2>
|
||||
, is_convertible<T2, T1>
|
||||
>
|
||||
{};
|
||||
template <class T1, T2>
|
||||
struct is_interoperable :
|
||||
or_<
|
||||
is_convertible<T1, T2>
|
||||
, is_convertible<T2, T1>
|
||||
>
|
||||
{};
|
||||
|
||||
template<
|
||||
class Derived1
|
||||
, class Derived2
|
||||
>
|
||||
enable_if<is_interoperable<Derived1, Derived2>, bool> operator==(
|
||||
Derived1 const& lhs
|
||||
, Derived2 const& rhs
|
||||
)
|
||||
{
|
||||
return static_cast<Derived1 const&>(lhs).equal_to(static_cast<Derived2 const&(rhs));
|
||||
}
|
||||
template<
|
||||
class Derived1
|
||||
, class Derived2
|
||||
>
|
||||
enable_if<is_interoperable<Derived1, Derived2>, bool> operator==(
|
||||
Derived1 const& lhs
|
||||
, Derived2 const& rhs
|
||||
)
|
||||
{
|
||||
return static_cast<Derived1 const&>(lhs).equal_to(static_cast<Derived2 const&(rhs));
|
||||
}
|
||||
|
||||
The problem with this is that operator== always forwards to Derived1::equal_to. The net effect is that the
|
||||
following "obvious" implementation of to interoperable types does not quite work.
|
||||
following "obvious" implementation of to interoperable types does
|
||||
not quite work. ::
|
||||
|
||||
struct Mutable : Facade<Mutable>
|
||||
{
|
||||
bool equal_to(Mutable const&);
|
||||
};
|
||||
struct Mutable : Facade<Mutable>
|
||||
{
|
||||
bool equal_to(Mutable const&);
|
||||
};
|
||||
|
||||
struct Constant : Facade<Constant>
|
||||
{
|
||||
Constant();
|
||||
Constant(Constant const&);
|
||||
Constant(Mutable const&);
|
||||
|
||||
...
|
||||
struct Constant : Facade<Constant>
|
||||
{
|
||||
Constant();
|
||||
Constant(Constant const&);
|
||||
Constant(Mutable const&);
|
||||
|
||||
bool equal_to(Constant const&);
|
||||
};
|
||||
...
|
||||
|
||||
Constant c;
|
||||
Mutable m;
|
||||
bool equal_to(Constant const&);
|
||||
};
|
||||
|
||||
c == m; // ok, dispatched to Constant::equal_to
|
||||
m == c; // !! error, dispatched to Mutable::equal_to
|
||||
Constant c;
|
||||
Mutable m;
|
||||
|
||||
Instead the following "slightly" more complicated implementation is necessary
|
||||
c == m; // ok, dispatched to Constant::equal_to
|
||||
m == c; // !! error, dispatched to Mutable::equal_to
|
||||
|
||||
struct Mutable : Facade<Mutable>
|
||||
{
|
||||
template <class T>
|
||||
enable_if<is_convertible<Mutable, T> || is_convertible<T, Mutable>, bool>::type equal_to(T const&);
|
||||
};
|
||||
Instead the following "slightly" more complicated implementation is necessary
|
||||
|
||||
struct Constant : Tag<Constant>
|
||||
{
|
||||
Constant();
|
||||
Constant(Constant const&);
|
||||
Constant(Mutable const&);
|
||||
struct Mutable : Facade<Mutable>
|
||||
{
|
||||
template <class T>
|
||||
enable_if<is_convertible<Mutable, T> || is_convertible<T, Mutable>, bool>::type equal_to(T const&);
|
||||
};
|
||||
|
||||
template <class T>
|
||||
enable_if<is_convertible<Constant, T> || is_convertible<T, Constant>, bool>::type equal_to(T const&);
|
||||
};
|
||||
struct Constant : Tag<Constant>
|
||||
{
|
||||
Constant();
|
||||
Constant(Constant const&);
|
||||
Constant(Mutable const&);
|
||||
|
||||
template <class T>
|
||||
enable_if<is_convertible<Constant, T> || is_convertible<T, Constant>, bool>::type equal_to(T const&);
|
||||
};
|
||||
|
||||
Beside the fact that the code is significantly more complex to understand and to teach there is
|
||||
a major design problem lurking here. Note that in both types equal_to is a function template with
|
||||
an unconstrained argument T. This is necessary so that further types can be made interoperable with
|
||||
Mutable or Constant. Would Mutable be defined as
|
||||
Mutable or Constant. Would Mutable be defined as ::
|
||||
|
||||
struct Mutable : Facade<Mutable>
|
||||
{
|
||||
bool equal_to(Mutable const&);
|
||||
bool equal_to(Constant const&);
|
||||
};
|
||||
struct Mutable : Facade<Mutable>
|
||||
{
|
||||
bool equal_to(Mutable const&);
|
||||
bool equal_to(Constant const&);
|
||||
};
|
||||
|
||||
Constant and Mutable would still be interoperable but no further interoperable could be added
|
||||
without changing Mutable. Even if this would be considered acceptable the current specification forces
|
||||
@ -111,44 +112,45 @@ The two way dependency can be avoided by enabling type conversion in the binary
|
||||
implementation. Note that this is the usual way interoperability betwween types is achieved
|
||||
for binary operators and one reason why binary operators are usually implemented as non-members.
|
||||
|
||||
A simple implementation of this strategy would look like this
|
||||
A simple implementation of this strategy would look like this ::
|
||||
|
||||
template<
|
||||
class T1
|
||||
, class T2
|
||||
>
|
||||
struct interoperable_base :
|
||||
if_<
|
||||
is_convertible<
|
||||
T2
|
||||
, T1
|
||||
>
|
||||
, T1
|
||||
, T2>
|
||||
{};
|
||||
template<
|
||||
class T1
|
||||
, class T2
|
||||
>
|
||||
struct interoperable_base :
|
||||
if_<
|
||||
is_convertible<
|
||||
T2
|
||||
, T1
|
||||
>
|
||||
, T1
|
||||
, T2>
|
||||
{};
|
||||
|
||||
|
||||
template<
|
||||
class Derived1
|
||||
, class Derived2
|
||||
>
|
||||
enable_if<is_interoperable<Derived1, Derived2>, bool> operator==(
|
||||
Derived1 const& lhs
|
||||
, Derived2 const& rhs
|
||||
)
|
||||
{
|
||||
typedef interoperable_base<
|
||||
Derived1
|
||||
, Derived2
|
||||
>::type Base;
|
||||
template<
|
||||
class Derived1
|
||||
, class Derived2
|
||||
>
|
||||
enable_if<is_interoperable<Derived1, Derived2>, bool> operator==(
|
||||
Derived1 const& lhs
|
||||
, Derived2 const& rhs
|
||||
)
|
||||
{
|
||||
typedef interoperable_base<
|
||||
Derived1
|
||||
, Derived2
|
||||
>::type Base;
|
||||
|
||||
return static_cast<Base const&>(lhs).equal_to(static_cast<Derived2 const&(rhs));
|
||||
}
|
||||
return static_cast<Base const&>(lhs).equal_to(static_cast<Derived2 const&(rhs));
|
||||
}
|
||||
|
||||
This way our original simple and "obvious" implementation would work again.
|
||||
This way our original simple and "obvious" implementation would
|
||||
work again. ::
|
||||
|
||||
c == m; // ok, dispatched to Constant::equal_to
|
||||
m == c; // ok, dispatched to Constant::equal_to, m converted to Constant
|
||||
c == m; // ok, dispatched to Constant::equal_to
|
||||
m == c; // ok, dispatched to Constant::equal_to, m converted to Constant
|
||||
|
||||
The backdraw of this approach is that a possibly costly conversion of iterator objects
|
||||
is forced on the user even in cases where direct comparison could be implemented
|
||||
@ -158,70 +160,71 @@ that iteration is a very basic operation this possible performance degradation i
|
||||
acceptable.
|
||||
|
||||
Luckily whe can have our cake and eat it by a slightly more clever implementation of the binary
|
||||
operators.
|
||||
operators. ::
|
||||
|
||||
template<
|
||||
class Derived1
|
||||
, class Derived2
|
||||
>
|
||||
enable_if<is_convertible<Derived2, Derived1>, bool> operator==(
|
||||
Derived1 const& lhs
|
||||
, Derived2 const& rhs
|
||||
)
|
||||
{
|
||||
return static_cast<Derived1 const&>(lhs).equal_to(static_cast<Derived2 const&(rhs));
|
||||
}
|
||||
template<
|
||||
class Derived1
|
||||
, class Derived2
|
||||
>
|
||||
enable_if<is_convertible<Derived2, Derived1>, bool> operator==(
|
||||
Derived1 const& lhs
|
||||
, Derived2 const& rhs
|
||||
)
|
||||
{
|
||||
return static_cast<Derived1 const&>(lhs).equal_to(static_cast<Derived2 const&(rhs));
|
||||
}
|
||||
|
||||
template<
|
||||
class Derived1
|
||||
, class Derived2
|
||||
>
|
||||
enable_if<is_convertible<Derived1, Derived2>, bool> operator==(
|
||||
Derived1 const& lhs
|
||||
, Derived2 const& rhs
|
||||
)
|
||||
{
|
||||
return static_cast<Derived2 const&>(rhs).equal_to(static_cast<Derived1 const&(lhs));
|
||||
}
|
||||
template<
|
||||
class Derived1
|
||||
, class Derived2
|
||||
>
|
||||
enable_if<is_convertible<Derived1, Derived2>, bool> operator==(
|
||||
Derived1 const& lhs
|
||||
, Derived2 const& rhs
|
||||
)
|
||||
{
|
||||
return static_cast<Derived2 const&>(rhs).equal_to(static_cast<Derived1 const&(lhs));
|
||||
}
|
||||
|
||||
Given our simple and obvious definition of Mutable and Constant nothing has changed yet.
|
||||
Given our simple and obvious definition of Mutable and Constant nothing has changed yet. ::
|
||||
|
||||
c == m; // ok, dispatched to Constant::equal_to, m converted to Constant
|
||||
m == c; // ok, dispatched to Constant::equal_to, m converted to Constant
|
||||
c == m; // ok, dispatched to Constant::equal_to, m converted to Constant
|
||||
m == c; // ok, dispatched to Constant::equal_to, m converted to Constant
|
||||
|
||||
But now the user can avoid the type conversion by supplying the appropriate overload in Constant
|
||||
But now the user can avoid the type conversion by supplying the
|
||||
appropriate overload in Constant ::
|
||||
|
||||
struct Constant : Facade<Constant>
|
||||
{
|
||||
Constant();
|
||||
Constant(Constant const&);
|
||||
Constant(Mutable const&);
|
||||
|
||||
...
|
||||
struct Constant : Facade<Constant>
|
||||
{
|
||||
Constant();
|
||||
Constant(Constant const&);
|
||||
Constant(Mutable const&);
|
||||
|
||||
bool equal_to(Constant const&);
|
||||
bool equal_to(Mutable const&);
|
||||
};
|
||||
...
|
||||
|
||||
c == m; // ok, dispatched to Constant::equal_to(Mutable const&), no conversion
|
||||
m == c; // ok, dispatched to Constant::equal_to(Mutable const&), no conversion
|
||||
bool equal_to(Constant const&);
|
||||
bool equal_to(Mutable const&);
|
||||
};
|
||||
|
||||
c == m; // ok, dispatched to Constant::equal_to(Mutable const&), no conversion
|
||||
m == c; // ok, dispatched to Constant::equal_to(Mutable const&), no conversion
|
||||
|
||||
This definition of operator== introduces a possible ambiguity when both types are convertible
|
||||
to each other. I don't think this is a problem as this behaviour is the same with concrete types.
|
||||
I.e.
|
||||
I.e. ::
|
||||
|
||||
struct A {};
|
||||
struct A {};
|
||||
|
||||
bool operator==(A, A);
|
||||
bool operator==(A, A);
|
||||
|
||||
struct B { B(A); };
|
||||
struct B { B(A); };
|
||||
|
||||
bool operator==(B, B);
|
||||
bool operator==(B, B);
|
||||
|
||||
A a;
|
||||
B b(a);
|
||||
A a;
|
||||
B b(a);
|
||||
|
||||
a == b; // error, ambiguous overload
|
||||
a == b; // error, ambiguous overload
|
||||
|
||||
Effect
|
||||
======
|
||||
|
451
doc/issues.html
451
doc/issues.html
@ -1,451 +0,0 @@
|
||||
<?xml version="1.0" encoding="utf-8" ?>
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||||
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
||||
<meta name="generator" content="Docutils 0.4: http://docutils.sourceforge.net/" />
|
||||
<title>Problem with is_writable and is_swappable in N1550</title>
|
||||
<meta name="author" content="David Abrahams and Jeremy Siek" />
|
||||
<meta name="organization" content="Boost Consulting, Indiana University Bloomington" />
|
||||
<meta name="date" content="2003-11-19" />
|
||||
<meta name="copyright" content="Copyright David Abrahams, Jeremy Siek 2003. Use, modification and distribution is subject to 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)" />
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:Copyright: This stylesheet has been placed in the public domain.
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</style>
|
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</head>
|
||||
<body>
|
||||
<div class="document" id="problem-with-is-writable-and-is-swappable-in-n1550">
|
||||
<h1 class="title">Problem with <tt class="docutils literal"><span class="pre">is_writable</span></tt> and <tt class="docutils literal"><span class="pre">is_swappable</span></tt> in <a class="reference" href="http://www.boost-consulting.com/writing/n1550.html">N1550</a></h1>
|
||||
<table class="docinfo" frame="void" rules="none">
|
||||
<col class="docinfo-name" />
|
||||
<col class="docinfo-content" />
|
||||
<tbody valign="top">
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams and Jeremy Siek</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="last reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University Bloomington</td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2003-11-19</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams, Jeremy Siek 2003. Use, modification and
|
||||
distribution is subject to the Boost Software License,
|
||||
Version 1.0. (See accompanying file LICENSE_1_0.txt or copy
|
||||
at <a class="reference" href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</td></tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#introduction" id="id1" name="id1">Introduction</a></li>
|
||||
<li><a class="reference" href="#proposed-resolution" id="id2" name="id2">Proposed Resolution</a></li>
|
||||
<li><a class="reference" href="#rationale" id="id3" name="id3">Rationale</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id1" id="introduction" name="introduction">Introduction</a></h1>
|
||||
<p>The <tt class="docutils literal"><span class="pre">is_writable</span></tt> and <tt class="docutils literal"><span class="pre">is_swappable</span></tt> traits classes in <a class="reference" href="http://www.boost-consulting.com/writing/n1550.html">N1550</a>
|
||||
provide a mechanism for determining at compile time if an iterator
|
||||
type is a model of the new Writable Iterator and Swappable Iterator
|
||||
concepts, analogous to <tt class="docutils literal"><span class="pre">iterator_traits<X>::iterator_category</span></tt>
|
||||
for the old iterator concepts. For backward compatibility,
|
||||
<tt class="docutils literal"><span class="pre">is_writable</span></tt> and <tt class="docutils literal"><span class="pre">is_swappable</span></tt> not only work with new
|
||||
iterators, but they also are intended to work for old
|
||||
iterators (iterators that meet the requirements for one of the
|
||||
iterator concepts in the current standard). In the case of old
|
||||
iterators, the writability and swapability is deduced based on the
|
||||
<tt class="docutils literal"><span class="pre">iterator_category</span></tt> and also the <tt class="docutils literal"><span class="pre">reference</span></tt> type. The
|
||||
specification for this deduction gives false positives for forward
|
||||
iterators that have non-assignable value types.</p>
|
||||
<p>To review, the part of the <tt class="docutils literal"><span class="pre">is_writable</span></tt> trait definition which
|
||||
applies to old iterators is:</p>
|
||||
<pre class="literal-block">
|
||||
if (cat is convertible to output_iterator_tag)
|
||||
return true;
|
||||
else if (cat is convertible to forward_iterator_tag
|
||||
and iterator_traits<Iterator>::reference is a
|
||||
mutable reference)
|
||||
return true;
|
||||
else
|
||||
return false;
|
||||
</pre>
|
||||
<p>Suppose the <tt class="docutils literal"><span class="pre">value_type</span></tt> of the iterator <tt class="docutils literal"><span class="pre">It</span></tt> has a private
|
||||
assignment operator:</p>
|
||||
<pre class="literal-block">
|
||||
class B {
|
||||
public:
|
||||
...
|
||||
private:
|
||||
B& operator=(const B&);
|
||||
};
|
||||
</pre>
|
||||
<p>and suppose the <tt class="docutils literal"><span class="pre">reference</span></tt> type of the iterator is <tt class="docutils literal"><span class="pre">B&</span></tt>. In
|
||||
that case, <tt class="docutils literal"><span class="pre">is_writable<It>::value</span></tt> will be true when in fact
|
||||
attempting to write into <tt class="docutils literal"><span class="pre">B</span></tt> will cause an error.</p>
|
||||
<p>The same problem applies to <tt class="docutils literal"><span class="pre">is_swappable</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id2" id="proposed-resolution" name="proposed-resolution">Proposed Resolution</a></h1>
|
||||
<ol class="arabic">
|
||||
<li><p class="first">Remove the <tt class="docutils literal"><span class="pre">is_writable</span></tt> and <tt class="docutils literal"><span class="pre">is_swappable</span></tt> traits, and remove the
|
||||
requirements in the Writable Iterator and Swappable Iterator concepts
|
||||
that require their models to support these traits.</p>
|
||||
</li>
|
||||
<li><p class="first">Change the <tt class="docutils literal"><span class="pre">is_readable</span></tt> specification to be:
|
||||
<tt class="docutils literal"><span class="pre">is_readable<X>::type</span></tt> is <tt class="docutils literal"><span class="pre">true_type</span></tt> if the
|
||||
result type of <tt class="docutils literal"><span class="pre">X::operator*</span></tt> is convertible to
|
||||
<tt class="docutils literal"><span class="pre">iterator_traits<X>::value_type</span></tt> and is <tt class="docutils literal"><span class="pre">false_type</span></tt>
|
||||
otherwise. Also, <tt class="docutils literal"><span class="pre">is_readable</span></tt> is required to satisfy
|
||||
the requirements for the UnaryTypeTrait concept
|
||||
(defined in the type traits proposal).</p>
|
||||
<p>Remove the requirement for support of the <tt class="docutils literal"><span class="pre">is_readable</span></tt> trait from
|
||||
the Readable Iterator concept.</p>
|
||||
</li>
|
||||
<li><p class="first">Remove the <tt class="docutils literal"><span class="pre">iterator_tag</span></tt> class.</p>
|
||||
</li>
|
||||
<li><p class="first">Change the specification of <tt class="docutils literal"><span class="pre">traversal_category</span></tt> to:</p>
|
||||
<pre class="literal-block">
|
||||
traversal-category(Iterator) =
|
||||
let cat = iterator_traits<Iterator>::iterator_category
|
||||
if (cat is convertible to incrementable_iterator_tag)
|
||||
return cat; // Iterator is a new iterator
|
||||
else if (cat is convertible to random_access_iterator_tag)
|
||||
return random_access_traversal_tag;
|
||||
else if (cat is convertible to bidirectional_iterator_tag)
|
||||
return bidirectional_traversal_tag;
|
||||
else if (cat is convertible to forward_iterator_tag)
|
||||
return forward_traversal_tag;
|
||||
else if (cat is convertible to input_iterator_tag)
|
||||
return single_pass_iterator_tag;
|
||||
else if (cat is convertible to output_iterator_tag)
|
||||
return incrementable_iterator_tag;
|
||||
else
|
||||
return null_category_tag;
|
||||
</pre>
|
||||
</li>
|
||||
</ol>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id3" id="rationale" name="rationale">Rationale</a></h1>
|
||||
<ol class="arabic simple">
|
||||
<li>There are two reasons for removing <tt class="docutils literal"><span class="pre">is_writable</span></tt>
|
||||
and <tt class="docutils literal"><span class="pre">is_swappable</span></tt>. The first is that we do not know of
|
||||
a way to fix the specification so that it gives the correct
|
||||
answer for all iterators. Second, there was only a weak
|
||||
motivation for having <tt class="docutils literal"><span class="pre">is_writable</span></tt> and <tt class="docutils literal"><span class="pre">is_swappable</span></tt>
|
||||
there in the first place. The main motivation was simply
|
||||
uniformity: we have tags for the old iterator categories
|
||||
so we should have tags for the new iterator categories.
|
||||
While having tags and the capability to dispatch based
|
||||
on the traversal categories is often used, we see
|
||||
less of a need for dispatching based on writability
|
||||
and swappability, since typically algorithms
|
||||
that need these capabilities have no alternative if
|
||||
they are not provided.</li>
|
||||
<li>We discovered that the <tt class="docutils literal"><span class="pre">is_readable</span></tt> trait can be implemented
|
||||
using only the iterator type itself and its <tt class="docutils literal"><span class="pre">value_type</span></tt>.
|
||||
Therefore we remove the requirement for <tt class="docutils literal"><span class="pre">is_readable</span></tt> from the
|
||||
Readable Iterator concept, and change the definition of
|
||||
<tt class="docutils literal"><span class="pre">is_readable</span></tt> so that it works for any iterator type.</li>
|
||||
<li>The purpose of the <tt class="docutils literal"><span class="pre">iterator_tag</span></tt> class was to
|
||||
bundle the traversal and access category tags
|
||||
into the <tt class="docutils literal"><span class="pre">iterator_category</span></tt> typedef.
|
||||
With <tt class="docutils literal"><span class="pre">is_writable</span></tt> and <tt class="docutils literal"><span class="pre">is_swappable</span></tt> gone, and
|
||||
<tt class="docutils literal"><span class="pre">is_readable</span></tt> no longer in need of special hints,
|
||||
there is no reason for iterators to provide
|
||||
information about the access capabilities of an iterator.
|
||||
Thus there is no need for the <tt class="docutils literal"><span class="pre">iterator_tag</span></tt>. The
|
||||
traversal tag can be directly used for the
|
||||
<tt class="docutils literal"><span class="pre">iterator_category</span></tt>. If a new iterator is intended to be backward
|
||||
compatible with old iterator concepts, a tag type
|
||||
that is convertible to both one of the new traversal tags
|
||||
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|
||||
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|
||||
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|
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|
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|
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doc/issues.rst
Executable file → Normal file
0
doc/issues.rst
Executable file → Normal file
@ -3,295 +3,13 @@
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|
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|
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<link rel="stylesheet" href="../../../rst.css" type="text/css" />
|
||||
</head>
|
||||
<body>
|
||||
<div class="document" id="iterator-adaptor">
|
||||
@ -303,13 +21,13 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams, Jeremy Siek, Thomas Witt</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference external" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference external" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
Railway Operation and Construction</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.</td></tr>
|
||||
</tbody>
|
||||
@ -341,30 +59,30 @@ Whether the derived class models any of the standard iterator concepts
|
||||
depends on the operations supported by the <tt class="docutils literal"><span class="pre">Base</span></tt> type and which
|
||||
core interface functions of <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> are redefined in the
|
||||
<tt class="docutils literal"><span class="pre">Derived</span></tt> class.</p>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first">Table of Contents</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#overview" id="id6" name="id6">Overview</a></li>
|
||||
<li><a class="reference" href="#reference" id="id7" name="id7">Reference</a><ul>
|
||||
<li><a class="reference" href="#iterator-adaptor-requirements" id="id8" name="id8"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> requirements</a></li>
|
||||
<li><a class="reference" href="#iterator-adaptor-base-class-parameters" id="id9" name="id9"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> base class parameters</a></li>
|
||||
<li><a class="reference" href="#iterator-adaptor-public-operations" id="id10" name="id10"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> public operations</a></li>
|
||||
<li><a class="reference" href="#iterator-adaptor-protected-member-functions" id="id11" name="id11"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> protected member functions</a></li>
|
||||
<li><a class="reference" href="#iterator-adaptor-private-member-functions" id="id12" name="id12"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> private member functions</a></li>
|
||||
<li><a class="reference internal" href="#overview" id="id6">Overview</a></li>
|
||||
<li><a class="reference internal" href="#reference" id="id7">Reference</a><ul>
|
||||
<li><a class="reference internal" href="#iterator-adaptor-requirements" id="id8"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> requirements</a></li>
|
||||
<li><a class="reference internal" href="#iterator-adaptor-base-class-parameters" id="id9"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> base class parameters</a></li>
|
||||
<li><a class="reference internal" href="#iterator-adaptor-public-operations" id="id10"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> public operations</a></li>
|
||||
<li><a class="reference internal" href="#iterator-adaptor-protected-member-functions" id="id11"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> protected member functions</a></li>
|
||||
<li><a class="reference internal" href="#iterator-adaptor-private-member-functions" id="id12"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> private member functions</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#tutorial-example" id="id13" name="id13">Tutorial Example</a></li>
|
||||
<li><a class="reference internal" href="#tutorial-example" id="id13">Tutorial Example</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id6" id="overview" name="overview">Overview</a></h1>
|
||||
<div class="section" id="overview">
|
||||
<h1><a class="toc-backref" href="#id6">Overview</a></h1>
|
||||
<!-- 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) -->
|
||||
<!-- Version 1.2 of this ReStructuredText document corresponds to
|
||||
n1530_, the paper accepted by the LWG for TR1. -->
|
||||
<!-- Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. -->
|
||||
<p>The <tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> class template adapts some <tt class="docutils literal"><span class="pre">Base</span></tt> <a class="footnote-reference" href="#base" id="id1" name="id1">[1]</a>
|
||||
<p>The <tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> class template adapts some <tt class="docutils literal"><span class="pre">Base</span></tt><a class="footnote-reference" href="#base" id="id1"><sup>1</sup></a>
|
||||
type to create a new iterator. Instantiations of <tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt>
|
||||
are derived from a corresponding instantiation of <tt class="docutils literal"><span class="pre">iterator_facade</span></tt>
|
||||
and implement the core behaviors in terms of the <tt class="docutils literal"><span class="pre">Base</span></tt> type. In
|
||||
@ -373,7 +91,7 @@ instance of the <tt class="docutils literal"><span class="pre">Base</span></tt>
|
||||
<table class="docutils footnote" frame="void" id="base" rules="none">
|
||||
<colgroup><col class="label" /><col /></colgroup>
|
||||
<tbody valign="top">
|
||||
<tr><td class="label"><a name="base">[1]</a></td><td><em>(<a class="fn-backref" href="#id1">1</a>, <a class="fn-backref" href="#id3">2</a>)</em> The term "Base" here does not refer to a base class and is
|
||||
<tr><td class="label">[1]</td><td><em>(<a class="fn-backref" href="#id1">1</a>, <a class="fn-backref" href="#id3">2</a>)</em> The term "Base" here does not refer to a base class and is
|
||||
not meant to imply the use of derivation. We have followed the lead
|
||||
of the standard library, which provides a base() function to access
|
||||
the underlying iterator object of a <tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> adaptor.</td></tr>
|
||||
@ -400,8 +118,8 @@ template parameter may not always be identical to the iterator's
|
||||
<tt class="docutils literal"><span class="pre">reference</span></tt> type, and will keep users from making mistakes based on
|
||||
that assumption.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id7" id="reference" name="reference">Reference</a></h1>
|
||||
<div class="section" id="reference">
|
||||
<h1><a class="toc-backref" href="#id7">Reference</a></h1>
|
||||
<!-- 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) -->
|
||||
@ -418,7 +136,7 @@ template <
|
||||
, class Difference = use_default
|
||||
>
|
||||
class iterator_adaptor
|
||||
: public iterator_facade<Derived, <em>V'</em>, <em>C'</em>, <em>R'</em>, <em>D'</em>> // see <a class="reference" href="#base-parameters">details</a>
|
||||
: public iterator_facade<Derived, <em>V'</em>, <em>C'</em>, <em>R'</em>, <em>D'</em>> // see <a class="reference internal" href="#base-parameters">details</a>
|
||||
{
|
||||
friend class iterator_core_access;
|
||||
public:
|
||||
@ -452,13 +170,13 @@ class iterator_adaptor
|
||||
Base m_iterator; // exposition only
|
||||
};
|
||||
</pre>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id8" id="iterator-adaptor-requirements" name="iterator-adaptor-requirements"><span id="requirements"></span><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> requirements</a></h2>
|
||||
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|
||||
<span id="requirements"></span><h2><a class="toc-backref" href="#id8"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> requirements</a></h2>
|
||||
<p><tt class="docutils literal"><span class="pre">static_cast<Derived*>(iterator_adaptor*)</span></tt> shall be well-formed.
|
||||
The <tt class="docutils literal"><span class="pre">Base</span></tt> argument shall be Assignable and Copy Constructible.</p>
|
||||
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|
||||
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|
||||
<h2><a class="toc-backref" href="#id9" id="iterator-adaptor-base-class-parameters" name="iterator-adaptor-base-class-parameters"><span id="base-parameters"></span><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> base class parameters</a></h2>
|
||||
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|
||||
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|
||||
<p>The <em>V'</em>, <em>C'</em>, <em>R'</em>, and <em>D'</em> parameters of the <tt class="docutils literal"><span class="pre">iterator_facade</span></tt>
|
||||
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|
||||
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|
||||
@ -498,8 +216,8 @@ expression involving ``Derived`` in those concepts' requirements. -->
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<h2><a class="toc-backref" href="#id10" id="iterator-adaptor-public-operations" name="iterator-adaptor-public-operations"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> public operations</a></h2>
|
||||
<div class="section" id="iterator-adaptor-public-operations">
|
||||
<h2><a class="toc-backref" href="#id10"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> public operations</a></h2>
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<h2><a class="toc-backref" href="#id11" id="iterator-adaptor-protected-member-functions" name="iterator-adaptor-protected-member-functions"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> protected member functions</a></h2>
|
||||
<div class="section" id="iterator-adaptor-protected-member-functions">
|
||||
<h2><a class="toc-backref" href="#id11"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> protected member functions</a></h2>
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id12" id="iterator-adaptor-private-member-functions" name="iterator-adaptor-private-member-functions"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> private member functions</a></h2>
|
||||
<div class="section" id="iterator-adaptor-private-member-functions">
|
||||
<h2><a class="toc-backref" href="#id12"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt> private member functions</a></h2>
|
||||
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|
||||
<table class="docutils field-list" frame="void" rules="none">
|
||||
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|
||||
@ -622,13 +340,13 @@ typename iterator_adaptor::difference_type distance_to(
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<h1><a class="toc-backref" href="#id13" id="tutorial-example" name="tutorial-example">Tutorial Example</a></h1>
|
||||
<div class="section" id="tutorial-example">
|
||||
<h1><a class="toc-backref" href="#id13">Tutorial Example</a></h1>
|
||||
<!-- Copyright David Abrahams 2004. Use, modification and distribution is -->
|
||||
<!-- subject to 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) -->
|
||||
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|
||||
template we developed in the <a class="reference" href="iterator_facade.html#tutorial-example"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> tutorial</a>. If you haven't already
|
||||
template we developed in the <a class="reference external" href="iterator_facade.html#tutorial-example"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> tutorial</a>. If you haven't already
|
||||
read that material, you should go back now and check it out because
|
||||
we're going to pick up right where it left off.</p>
|
||||
<div class="sidebar">
|
||||
@ -651,12 +369,12 @@ of the same associated types (<tt class="docutils literal"><span class="pre">val
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
just a few aspects of the underlying type's behavior is an
|
||||
extremely common one, and it's the pattern addressed by
|
||||
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|
||||
@ -707,7 +425,7 @@ the complicated base class type of <tt class="docutils literal"><span class="pre
|
||||
this technique is known not to work with Borland C++ 5.6.4 and
|
||||
Metrowerks CodeWarrior versions prior to 9.0]</p>
|
||||
<p>You can see an example program that exercises this version of the
|
||||
node iterators <a class="reference" href="../example/node_iterator3.cpp">here</a>.</p>
|
||||
node iterators <a class="reference external" href="../example/node_iterator3.cpp">here</a>.</p>
|
||||
<p>In the case of <tt class="docutils literal"><span class="pre">node_iter</span></tt>, it's not very compelling to pass
|
||||
<tt class="docutils literal"><span class="pre">boost::use_default</span></tt> as <tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt>'s <tt class="docutils literal"><span class="pre">Value</span></tt>
|
||||
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|
||||
@ -725,13 +443,19 @@ std::iterator_traits<Iterator>::<em>some-associated-type</em>
|
||||
</pre>
|
||||
<p>at least four times.</p>
|
||||
<p>We urge you to review the documentation and implementations of
|
||||
<a class="reference" href="reverse_iterator.html"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt></a> and the other Boost <a class="reference" href="index.html#specialized-adaptors">specialized iterator
|
||||
<a class="reference external" href="reverse_iterator.html"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt></a> and the other Boost <a class="reference external" href="index.html#specialized-adaptors">specialized iterator
|
||||
adaptors</a> to get an idea of the sorts of things you can do with
|
||||
<tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt>. In particular, have a look at
|
||||
<a class="reference" href="transform_iterator.html"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt></a>, which is perhaps the most straightforward
|
||||
adaptor, and also <a class="reference" href="counting_iterator.html"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt></a>, which demonstrates that
|
||||
<a class="reference external" href="transform_iterator.html"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt></a>, which is perhaps the most straightforward
|
||||
adaptor, and also <a class="reference external" href="counting_iterator.html"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt></a>, which demonstrates that
|
||||
<tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt>'s <tt class="docutils literal"><span class="pre">Base</span></tt> type needn't be an iterator.</p>
|
||||
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|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="iterator_adaptor.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
|
||||
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|
||||
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|
||||
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|
||||
|
0
doc/iterator_adaptor.pdf
Executable file → Normal file
0
doc/iterator_adaptor.pdf
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doc/iterator_adaptor_tutorial.rst
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doc/iterator_adaptor_tutorial.rst
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doc/iterator_archetypes.html
Executable file → Normal file
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Executable file → Normal file
@ -3,295 +3,13 @@
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|
||||
<div class="document" id="iterator-archetype">
|
||||
@ -303,12 +21,12 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams, Jeremy Siek, Thomas Witt</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference" href="mailto:witt@styleadvisor.com">witt@styleadvisor.com</a></td></tr>
|
||||
<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference external" href="mailto:witt@styleadvisor.com">witt@styleadvisor.com</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, <a class="last reference" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr>
|
||||
<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, <a class="last reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2004.</td></tr>
|
||||
</tbody>
|
||||
@ -324,27 +42,27 @@ Lab</a>, <a class="last reference" href="http://www.styleadvisor.com">Zephyr Ass
|
||||
one of the iterator access concepts and one of the iterator traversal concepts.
|
||||
This is used for doing a compile-time check to see if a the type requirements
|
||||
of a template are really enough to cover the implementation of the template.
|
||||
For further information see the documentation for the <a class="reference" href="../../concept_check/index.html"><tt class="docutils literal"><span class="pre">boost::concept_check</span></tt></a> library.</td>
|
||||
For further information see the documentation for the <a class="reference external" href="../../concept_check/index.html"><tt class="docutils literal"><span class="pre">boost::concept_check</span></tt></a> library.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first">Table of Contents</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#reference" id="id1" name="id1">Reference</a><ul>
|
||||
<li><a class="reference" href="#iterator-archetype-synopsis" id="id2" name="id2"><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> Synopsis</a></li>
|
||||
<li><a class="reference" href="#access-category-tags" id="id3" name="id3"><tt class="docutils literal"><span class="pre">Access</span> <span class="pre">Category</span> <span class="pre">Tags</span></tt></a></li>
|
||||
<li><a class="reference" href="#iterator-archetype-requirements" id="id4" name="id4"><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> Requirements</a></li>
|
||||
<li><a class="reference" href="#iterator-archetype-models" id="id5" name="id5"><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> Models</a></li>
|
||||
<li><a class="reference" href="#traits" id="id6" name="id6"><tt class="docutils literal"><span class="pre">Traits</span></tt></a></li>
|
||||
<li><a class="reference internal" href="#reference" id="id1">Reference</a><ul>
|
||||
<li><a class="reference internal" href="#iterator-archetype-synopsis" id="id2"><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> Synopsis</a></li>
|
||||
<li><a class="reference internal" href="#access-category-tags" id="id3"><tt class="docutils literal"><span class="pre">Access</span> <span class="pre">Category</span> <span class="pre">Tags</span></tt></a></li>
|
||||
<li><a class="reference internal" href="#iterator-archetype-requirements" id="id4"><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> Requirements</a></li>
|
||||
<li><a class="reference internal" href="#iterator-archetype-models" id="id5"><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> Models</a></li>
|
||||
<li><a class="reference internal" href="#traits" id="id6"><tt class="docutils literal"><span class="pre">Traits</span></tt></a></li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id1" id="reference" name="reference">Reference</a></h1>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id2" id="iterator-archetype-synopsis" name="iterator-archetype-synopsis"><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> Synopsis</a></h2>
|
||||
<div class="section" id="reference">
|
||||
<h1><a class="toc-backref" href="#id1">Reference</a></h1>
|
||||
<div class="section" id="iterator-archetype-synopsis">
|
||||
<h2><a class="toc-backref" href="#id2"><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> Synopsis</a></h2>
|
||||
<pre class="literal-block">
|
||||
namespace iterator_archetypes
|
||||
{
|
||||
@ -373,8 +91,8 @@ class iterator_archetype
|
||||
};
|
||||
</pre>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id3" id="access-category-tags" name="access-category-tags"><tt class="docutils literal"><span class="pre">Access</span> <span class="pre">Category</span> <span class="pre">Tags</span></tt></a></h2>
|
||||
<div class="section" id="access-category-tags">
|
||||
<h2><a class="toc-backref" href="#id3"><tt class="docutils literal"><span class="pre">Access</span> <span class="pre">Category</span> <span class="pre">Tags</span></tt></a></h2>
|
||||
<p>The access category types provided correspond to the following
|
||||
standard iterator access concept combinations:</p>
|
||||
<pre class="literal-block">
|
||||
@ -399,23 +117,23 @@ writeable_lvalue_iterator_t :=
|
||||
Readable Iterator & Writeable Iterator & Swappable Iterator & Lvalue Iterator
|
||||
</pre>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id4" id="iterator-archetype-requirements" name="iterator-archetype-requirements"><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> Requirements</a></h2>
|
||||
<div class="section" id="iterator-archetype-requirements">
|
||||
<h2><a class="toc-backref" href="#id4"><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> Requirements</a></h2>
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id5" id="iterator-archetype-models" name="iterator-archetype-models"><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> Models</a></h2>
|
||||
<div class="section" id="iterator-archetype-models">
|
||||
<h2><a class="toc-backref" href="#id5"><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> Models</a></h2>
|
||||
<p><tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> models the iterator concepts specified by the
|
||||
<tt class="docutils literal"><span class="pre">AccessCategory</span></tt> and <tt class="docutils literal"><span class="pre">TraversalCategory</span></tt>
|
||||
arguments. <tt class="docutils literal"><span class="pre">iterator_archetype</span></tt> does not model any other access
|
||||
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|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id6" id="traits" name="traits"><tt class="docutils literal"><span class="pre">Traits</span></tt></a></h2>
|
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|
||||
<h2><a class="toc-backref" href="#id6"><tt class="docutils literal"><span class="pre">Traits</span></tt></a></h2>
|
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<p>The nested trait types are defined as follows:</p>
|
||||
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|
||||
if (AccessCategory == readable_iterator_t)
|
||||
@ -495,6 +213,12 @@ iterator_category :=
|
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</pre>
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|
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<a class="reference external" href="iterator_archetypes.rst">View document source</a>.
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Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
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doc/iterator_archetypes.pdf
Executable file → Normal file
0
doc/iterator_archetypes.pdf
Executable file → Normal file
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Executable file → Normal file
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Executable file → Normal file
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|
||||
<div class="document" id="iterator-concepts">
|
||||
@ -303,12 +21,12 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams, Jeremy Siek, Thomas Witt</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference" href="mailto:witt@styleadvisor.com">witt@styleadvisor.com</a></td></tr>
|
||||
<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference external" href="mailto:witt@styleadvisor.com">witt@styleadvisor.com</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, <a class="last reference" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr>
|
||||
<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, <a class="last reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2004.</td></tr>
|
||||
</tbody>
|
||||
@ -328,30 +46,30 @@ the template.</td>
|
||||
</tbody>
|
||||
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|
||||
<p>For an introduction to using concept checking classes, see
|
||||
the documentation for the <a class="reference" href="../../concept_check/index.html"><tt class="docutils literal"><span class="pre">boost::concept_check</span></tt></a> library.</p>
|
||||
<div class="section">
|
||||
<h1><a id="reference" name="reference">Reference</a></h1>
|
||||
<div class="section">
|
||||
<h2><a id="iterator-access-concepts" name="iterator-access-concepts">Iterator Access Concepts</a></h2>
|
||||
the documentation for the <a class="reference external" href="../../concept_check/index.html"><tt class="docutils literal"><span class="pre">boost::concept_check</span></tt></a> library.</p>
|
||||
<div class="section" id="reference">
|
||||
<h1>Reference</h1>
|
||||
<div class="section" id="iterator-access-concepts">
|
||||
<h2>Iterator Access Concepts</h2>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="ReadableIterator.html"><em>Readable Iterator</em></a></li>
|
||||
<li><a class="reference" href="WritableIterator.html"><em>Writable Iterator</em></a></li>
|
||||
<li><a class="reference" href="SwappableIterator.html"><em>Swappable Iterator</em></a></li>
|
||||
<li><a class="reference" href="LvalueIterator.html"><em>Lvalue Iterator</em></a></li>
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<div class="section">
|
||||
<h2><a id="iterator-traversal-concepts" name="iterator-traversal-concepts">Iterator Traversal Concepts</a></h2>
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<h2><a id="iterator-concepts-hpp-synopsis" name="iterator-concepts-hpp-synopsis"><tt class="docutils literal"><span class="pre">iterator_concepts.hpp</span></tt> Synopsis</a></h2>
|
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|
||||
<h2><tt class="docutils literal"><span class="pre">iterator_concepts.hpp</span></tt> Synopsis</h2>
|
||||
<pre class="literal-block">
|
||||
namespace boost_concepts {
|
||||
|
||||
@ -398,6 +116,12 @@ namespace boost_concepts {
|
||||
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|
||||
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|
||||
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|
||||
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Executable file → Normal file
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doc/iterator_concepts.pdf
Executable file → Normal file
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Executable file → Normal file
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@ -303,13 +21,13 @@ ul.auto-toc {
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<tr><th class="docinfo-name">Author:</th>
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||||
<td>David Abrahams, Jeremy Siek, Thomas Witt</td></tr>
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<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
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<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference" href="http://www.osl.iu.edu">Open Systems
|
||||
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|
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|
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|
||||
Railway Operation and Construction</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.</td></tr>
|
||||
</tbody>
|
||||
@ -330,46 +48,46 @@ and associated types, to be supplied by a derived iterator class.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first">Table of Contents</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#overview" id="id23" name="id23">Overview</a><ul>
|
||||
<li><a class="reference" href="#usage" id="id24" name="id24">Usage</a></li>
|
||||
<li><a class="reference" href="#iterator-core-access" id="id25" name="id25">Iterator Core Access</a></li>
|
||||
<li><a class="reference" href="#operator" id="id26" name="id26"><tt class="docutils literal"><span class="pre">operator[]</span></tt></a></li>
|
||||
<li><a class="reference" href="#id2" id="id27" name="id27"><tt class="docutils literal"><span class="pre">operator-></span></tt></a></li>
|
||||
<li><a class="reference internal" href="#overview" id="id23">Overview</a><ul>
|
||||
<li><a class="reference internal" href="#usage" id="id24">Usage</a></li>
|
||||
<li><a class="reference internal" href="#iterator-core-access" id="id25">Iterator Core Access</a></li>
|
||||
<li><a class="reference internal" href="#operator" id="id26"><tt class="docutils literal"><span class="pre">operator[]</span></tt></a></li>
|
||||
<li><a class="reference internal" href="#id2" id="id27"><tt class="docutils literal"><span class="pre">operator-></span></tt></a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#reference" id="id28" name="id28">Reference</a><ul>
|
||||
<li><a class="reference" href="#iterator-facade-requirements" id="id29" name="id29"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> Requirements</a></li>
|
||||
<li><a class="reference" href="#iterator-facade-operations" id="id30" name="id30"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> operations</a></li>
|
||||
<li><a class="reference internal" href="#reference" id="id28">Reference</a><ul>
|
||||
<li><a class="reference internal" href="#iterator-facade-requirements" id="id29"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> Requirements</a></li>
|
||||
<li><a class="reference internal" href="#iterator-facade-operations" id="id30"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> operations</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#tutorial-example" id="id31" name="id31">Tutorial Example</a><ul>
|
||||
<li><a class="reference" href="#the-problem" id="id32" name="id32">The Problem</a></li>
|
||||
<li><a class="reference" href="#a-basic-iterator-using-iterator-facade" id="id33" name="id33">A Basic Iterator Using <tt class="docutils literal"><span class="pre">iterator_facade</span></tt></a><ul>
|
||||
<li><a class="reference" href="#template-arguments-for-iterator-facade" id="id34" name="id34">Template Arguments for <tt class="docutils literal"><span class="pre">iterator_facade</span></tt></a><ul>
|
||||
<li><a class="reference" href="#derived" id="id35" name="id35"><tt class="docutils literal"><span class="pre">Derived</span></tt></a></li>
|
||||
<li><a class="reference" href="#value" id="id36" name="id36"><tt class="docutils literal"><span class="pre">Value</span></tt></a></li>
|
||||
<li><a class="reference" href="#categoryortraversal" id="id37" name="id37"><tt class="docutils literal"><span class="pre">CategoryOrTraversal</span></tt></a></li>
|
||||
<li><a class="reference" href="#id12" id="id38" name="id38"><tt class="docutils literal"><span class="pre">Reference</span></tt></a></li>
|
||||
<li><a class="reference" href="#difference" id="id39" name="id39"><tt class="docutils literal"><span class="pre">Difference</span></tt></a></li>
|
||||
<li><a class="reference internal" href="#tutorial-example" id="id31">Tutorial Example</a><ul>
|
||||
<li><a class="reference internal" href="#the-problem" id="id32">The Problem</a></li>
|
||||
<li><a class="reference internal" href="#a-basic-iterator-using-iterator-facade" id="id33">A Basic Iterator Using <tt class="docutils literal"><span class="pre">iterator_facade</span></tt></a><ul>
|
||||
<li><a class="reference internal" href="#template-arguments-for-iterator-facade" id="id34">Template Arguments for <tt class="docutils literal"><span class="pre">iterator_facade</span></tt></a><ul>
|
||||
<li><a class="reference internal" href="#derived" id="id35"><tt class="docutils literal"><span class="pre">Derived</span></tt></a></li>
|
||||
<li><a class="reference internal" href="#value" id="id36"><tt class="docutils literal"><span class="pre">Value</span></tt></a></li>
|
||||
<li><a class="reference internal" href="#categoryortraversal" id="id37"><tt class="docutils literal"><span class="pre">CategoryOrTraversal</span></tt></a></li>
|
||||
<li><a class="reference internal" href="#id12" id="id38"><tt class="docutils literal"><span class="pre">Reference</span></tt></a></li>
|
||||
<li><a class="reference internal" href="#difference" id="id39"><tt class="docutils literal"><span class="pre">Difference</span></tt></a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#constructors-and-data-members" id="id40" name="id40">Constructors and Data Members</a></li>
|
||||
<li><a class="reference" href="#implementing-the-core-operations" id="id41" name="id41">Implementing the Core Operations</a></li>
|
||||
<li><a class="reference internal" href="#constructors-and-data-members" id="id40">Constructors and Data Members</a></li>
|
||||
<li><a class="reference internal" href="#implementing-the-core-operations" id="id41">Implementing the Core Operations</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#a-constant-node-iterator" id="id42" name="id42">A constant <tt class="docutils literal"><span class="pre">node_iterator</span></tt></a></li>
|
||||
<li><a class="reference" href="#interoperability" id="id43" name="id43">Interoperability</a></li>
|
||||
<li><a class="reference" href="#telling-the-truth" id="id44" name="id44">Telling the Truth</a></li>
|
||||
<li><a class="reference" href="#wrap-up" id="id45" name="id45">Wrap Up</a></li>
|
||||
<li><a class="reference internal" href="#a-constant-node-iterator" id="id42">A constant <tt class="docutils literal"><span class="pre">node_iterator</span></tt></a></li>
|
||||
<li><a class="reference internal" href="#interoperability" id="id43">Interoperability</a></li>
|
||||
<li><a class="reference internal" href="#telling-the-truth" id="id44">Telling the Truth</a></li>
|
||||
<li><a class="reference internal" href="#wrap-up" id="id45">Wrap Up</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id23" id="overview" name="overview">Overview</a></h1>
|
||||
<div class="section" id="overview">
|
||||
<h1><a class="toc-backref" href="#id23">Overview</a></h1>
|
||||
<!-- 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) -->
|
||||
@ -392,7 +110,7 @@ include the associated types exposed through iterator traits:
|
||||
<tt class="docutils literal"><span class="pre">value_type</span></tt>, <tt class="docutils literal"><span class="pre">reference</span></tt>, <tt class="docutils literal"><span class="pre">difference_type</span></tt>, and
|
||||
<tt class="docutils literal"><span class="pre">iterator_category</span></tt>.</p>
|
||||
<p>Iterator facade uses the Curiously Recurring Template
|
||||
Pattern (CRTP) <a class="citation-reference" href="#cop95" id="id1" name="id1">[Cop95]</a> so that the user can specify the behavior
|
||||
Pattern (CRTP) <a class="citation-reference" href="#cop95" id="id1">[Cop95]</a> so that the user can specify the behavior
|
||||
of <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> in a derived class. Former designs used
|
||||
policy objects to specify the behavior, but that approach was
|
||||
discarded for several reasons:</p>
|
||||
@ -415,8 +133,8 @@ iterators, and a separate <tt class="docutils literal"><span class="pre">iterato
|
||||
impossible.</li>
|
||||
</ol>
|
||||
</blockquote>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id24" id="usage" name="usage">Usage</a></h2>
|
||||
<div class="section" id="usage">
|
||||
<h2><a class="toc-backref" href="#id24">Usage</a></h2>
|
||||
<p>The user of <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> derives his iterator class from a
|
||||
specialization of <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> and passes the derived
|
||||
iterator class as <tt class="docutils literal"><span class="pre">iterator_facade</span></tt>'s first template parameter.
|
||||
@ -479,8 +197,8 @@ constructor. Finally, if the iterator is to model Forward Traversal
|
||||
Iterator or a more-refined iterator concept, a default constructor is
|
||||
required.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id25" id="iterator-core-access" name="iterator-core-access">Iterator Core Access</a></h2>
|
||||
<div class="section" id="iterator-core-access">
|
||||
<h2><a class="toc-backref" href="#id25">Iterator Core Access</a></h2>
|
||||
<p><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> and the operator implementations need to be able
|
||||
to access the core member functions in the derived class. Making the
|
||||
core member functions public would expose an implementation detail to
|
||||
@ -513,19 +231,19 @@ standardize the gateway protocol. Note that even if
|
||||
open a safety loophole, as every core member function preserves the
|
||||
invariants of the iterator.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id26" id="operator" name="operator"><tt class="docutils literal"><span class="pre">operator[]</span></tt></a></h2>
|
||||
<div class="section" id="operator">
|
||||
<h2><a class="toc-backref" href="#id26"><tt class="docutils literal"><span class="pre">operator[]</span></tt></a></h2>
|
||||
<p>The indexing operator for a generalized iterator presents special
|
||||
challenges. A random access iterator's <tt class="docutils literal"><span class="pre">operator[]</span></tt> is only
|
||||
required to return something convertible to its <tt class="docutils literal"><span class="pre">value_type</span></tt>.
|
||||
Requiring that it return an lvalue would rule out currently-legal
|
||||
random-access iterators which hold the referenced value in a data
|
||||
member (e.g. <a class="reference" href="counting_iterator.html"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt></a>), because <tt class="docutils literal"><span class="pre">*(p+n)</span></tt> is a reference
|
||||
member (e.g. <a class="reference external" href="counting_iterator.html"><tt class="docutils literal"><span class="pre">counting_iterator</span></tt></a>), because <tt class="docutils literal"><span class="pre">*(p+n)</span></tt> is a reference
|
||||
into the temporary iterator <tt class="docutils literal"><span class="pre">p+n</span></tt>, which is destroyed when
|
||||
<tt class="docutils literal"><span class="pre">operator[]</span></tt> returns.</p>
|
||||
<p>Writable iterators built with <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> implement the
|
||||
semantics required by the preferred resolution to <a class="reference" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#299">issue 299</a> and
|
||||
adopted by proposal <a class="reference" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a>: the result of <tt class="docutils literal"><span class="pre">p[n]</span></tt> is an object
|
||||
semantics required by the preferred resolution to <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#299">issue 299</a> and
|
||||
adopted by proposal <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a>: the result of <tt class="docutils literal"><span class="pre">p[n]</span></tt> is an object
|
||||
convertible to the iterator's <tt class="docutils literal"><span class="pre">value_type</span></tt>, and <tt class="docutils literal"><span class="pre">p[n]</span> <span class="pre">=</span> <span class="pre">x</span></tt> is
|
||||
equivalent to <tt class="docutils literal"><span class="pre">*(p</span> <span class="pre">+</span> <span class="pre">n)</span> <span class="pre">=</span> <span class="pre">x</span></tt> (Note: This result object may be
|
||||
implemented as a proxy containing a copy of <tt class="docutils literal"><span class="pre">p+n</span></tt>). This approach
|
||||
@ -536,8 +254,8 @@ the implementation of her iterator is free to implement an
|
||||
class; it will hide the one supplied by <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> from
|
||||
clients of her iterator.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id27" id="id2" name="id2"><span id="operator-arrow"></span><tt class="docutils literal"><span class="pre">operator-></span></tt></a></h2>
|
||||
<div class="section" id="id2">
|
||||
<span id="operator-arrow"></span><h2><a class="toc-backref" href="#id27"><tt class="docutils literal"><span class="pre">operator-></span></tt></a></h2>
|
||||
<p>The <tt class="docutils literal"><span class="pre">reference</span></tt> type of a readable iterator (and today's input
|
||||
iterator) need not in fact be a reference, so long as it is
|
||||
convertible to the iterator's <tt class="docutils literal"><span class="pre">value_type</span></tt>. When the <tt class="docutils literal"><span class="pre">value_type</span></tt>
|
||||
@ -552,14 +270,14 @@ satisfied by the <tt class="docutils literal"><span class="pre">iterator_facade<
|
||||
<table class="docutils citation" frame="void" id="cop95" rules="none">
|
||||
<colgroup><col class="label" /><col /></colgroup>
|
||||
<tbody valign="top">
|
||||
<tr><td class="label"><a name="cop95">[Cop95]</a></td><td><em>(<a class="fn-backref" href="#id1">1</a>, <a class="fn-backref" href="#id10">2</a>)</em> [Coplien, 1995] Coplien, J., Curiously Recurring Template
|
||||
<tr><td class="label">[Cop95]</td><td><em>(<a class="fn-backref" href="#id1">1</a>, <a class="fn-backref" href="#id10">2</a>)</em> [Coplien, 1995] Coplien, J., Curiously Recurring Template
|
||||
Patterns, C++ Report, February 1995, pp. 24-27.</td></tr>
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id28" id="reference" name="reference">Reference</a></h1>
|
||||
<div class="section" id="reference">
|
||||
<h1><a class="toc-backref" href="#id28">Reference</a></h1>
|
||||
<!-- 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) -->
|
||||
@ -580,11 +298,11 @@ class iterator_facade {
|
||||
typedef Reference reference;
|
||||
typedef Value* pointer;
|
||||
typedef Difference difference_type;
|
||||
typedef /* see <a class="reference" href="#iterator-category">below</a> */ iterator_category;
|
||||
typedef /* see <a class="reference internal" href="#iterator-category">below</a> */ iterator_category;
|
||||
|
||||
reference operator*() const;
|
||||
/* see <a class="reference" href="#operator-arrow">below</a> */ operator->() const;
|
||||
/* see <a class="reference" href="#brackets">below</a> */ operator[](difference_type n) const;
|
||||
/* see <a class="reference internal" href="#operator-arrow">below</a> */ operator->() const;
|
||||
/* see <a class="reference internal" href="#brackets">below</a> */ operator[](difference_type n) const;
|
||||
Derived& operator++();
|
||||
Derived operator++(int);
|
||||
Derived& operator--();
|
||||
@ -636,7 +354,7 @@ operator >=(iterator_facade<Dr1,V1,TC1,R1,D1> const& lhs,
|
||||
// Iterator difference
|
||||
template <class Dr1, class V1, class TC1, class R1, class D1,
|
||||
class Dr2, class V2, class TC2, class R2, class D2>
|
||||
/* see <a class="reference" href="#minus">below</a> */
|
||||
/* see <a class="reference internal" href="#minus">below</a> */
|
||||
operator-(iterator_facade<Dr1,V1,TC1,R1,D1> const& lhs,
|
||||
iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs);
|
||||
|
||||
@ -688,7 +406,7 @@ Derived operator+ (typename Derived::difference_type n,
|
||||
X1 = C
|
||||
}
|
||||
|
||||
2. <a class="reference" href="new-iter-concepts.html#category-to-traversal"><em>category-to-traversal</em></a>(X) is convertible to the most
|
||||
2. <a class="reference external" href="new-iter-concepts.html#category-to-traversal"><em>category-to-traversal</em></a>(X) is convertible to the most
|
||||
derived traversal tag type to which X is also
|
||||
convertible, and not to any more-derived traversal tag
|
||||
type.
|
||||
@ -722,8 +440,8 @@ struct enable_if_interoperable
|
||||
>
|
||||
{};
|
||||
</pre>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id29" id="iterator-facade-requirements" name="iterator-facade-requirements"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> Requirements</a></h2>
|
||||
<div class="section" id="iterator-facade-requirements">
|
||||
<h2><a class="toc-backref" href="#id29"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> Requirements</a></h2>
|
||||
<p>The following table describes the typical valid expressions on
|
||||
<tt class="docutils literal"><span class="pre">iterator_facade</span></tt>'s <tt class="docutils literal"><span class="pre">Derived</span></tt> parameter, depending on the
|
||||
iterator concept(s) it will model. The operations in the first
|
||||
@ -736,8 +454,8 @@ object of type <tt class="docutils literal"><span class="pre">X</span></tt>, <tt
|
||||
object of a single pass iterator type interoperable with <tt class="docutils literal"><span class="pre">X</span></tt>, and <tt class="docutils literal"><span class="pre">z</span></tt>
|
||||
is a constant object of a random access traversal iterator type
|
||||
interoperable with <tt class="docutils literal"><span class="pre">X</span></tt>.</p>
|
||||
<div class="topic">
|
||||
<p class="topic-title first"><a id="core-operations" name="core-operations"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> Core Operations</a></p>
|
||||
<div class="topic" id="core-operations">
|
||||
<p class="topic-title first"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> Core Operations</p>
|
||||
<table border="1" class="docutils">
|
||||
<colgroup>
|
||||
<col width="21%" />
|
||||
@ -796,8 +514,8 @@ Iterator</td>
|
||||
</table>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id30" id="iterator-facade-operations" name="iterator-facade-operations"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> operations</a></h2>
|
||||
<div class="section" id="iterator-facade-operations">
|
||||
<h2><a class="toc-backref" href="#id30"><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> operations</a></h2>
|
||||
<p>The operations in this section are described in terms of operations on
|
||||
the core interface of <tt class="docutils literal"><span class="pre">Derived</span></tt> which may be inaccessible
|
||||
(i.e. private). The implementation should access these operations
|
||||
@ -811,7 +529,7 @@ through member functions of class <tt class="docutils literal"><span class="pre"
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<p><tt class="docutils literal"><span class="pre">operator->()</span> <span class="pre">const;</span></tt> (see <a class="reference" href="#operator-arrow">below</a>)</p>
|
||||
<p><tt class="docutils literal"><span class="pre">operator->()</span> <span class="pre">const;</span></tt> (see <a class="reference internal" href="#operator-arrow">below</a>)</p>
|
||||
<table class="docutils field-list" frame="void" rules="none">
|
||||
<col class="field-name" />
|
||||
<col class="field-body" />
|
||||
@ -1140,18 +858,18 @@ operator -(iterator_facade<Dr1,V1,TC1,R1,D1> const& lhs,
|
||||
</table>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id31" id="tutorial-example" name="tutorial-example">Tutorial Example</a></h1>
|
||||
<div class="section" id="tutorial-example">
|
||||
<h1><a class="toc-backref" href="#id31">Tutorial Example</a></h1>
|
||||
<!-- Copyright David Abrahams 2004. Use, modification and distribution is -->
|
||||
<!-- subject to 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) -->
|
||||
<p>In this section we'll walk through the implementation of a few
|
||||
iterators using <tt class="docutils literal"><span class="pre">iterator_facade</span></tt>, based around the simple
|
||||
example of a linked list of polymorphic objects. This example was
|
||||
inspired by a <a class="reference" href="http://thread.gmane.org/gmane.comp.lib.boost.user/5100">posting</a> by Keith Macdonald on the <a class="reference" href="../../../more/mailing_lists.htm#users">Boost-Users</a>
|
||||
inspired by a <a class="reference external" href="http://thread.gmane.org/gmane.comp.lib.boost.user/5100">posting</a> by Keith Macdonald on the <a class="reference external" href="http://www.boost.org/more/mailing_lists.htm#users">Boost-Users</a>
|
||||
mailing list.</p>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id32" id="the-problem" name="the-problem">The Problem</a></h2>
|
||||
<div class="section" id="the-problem">
|
||||
<h2><a class="toc-backref" href="#id32">The Problem</a></h2>
|
||||
<p>Say we've written a polymorphic linked list node base class:</p>
|
||||
<pre class="literal-block">
|
||||
# include <iostream>
|
||||
@ -1212,8 +930,8 @@ inline std::ostream& operator<<(std::ostream& s, node_base const&a
|
||||
<p>Our first challenge is to build an appropriate iterator over these
|
||||
lists.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id33" id="a-basic-iterator-using-iterator-facade" name="a-basic-iterator-using-iterator-facade">A Basic Iterator Using <tt class="docutils literal"><span class="pre">iterator_facade</span></tt></a></h2>
|
||||
<div class="section" id="a-basic-iterator-using-iterator-facade">
|
||||
<h2><a class="toc-backref" href="#id33">A Basic Iterator Using <tt class="docutils literal"><span class="pre">iterator_facade</span></tt></a></h2>
|
||||
<p>We will construct a <tt class="docutils literal"><span class="pre">node_iterator</span></tt> class using inheritance from
|
||||
<tt class="docutils literal"><span class="pre">iterator_facade</span></tt> to implement most of the iterator's operations.</p>
|
||||
<pre class="literal-block">
|
||||
@ -1226,45 +944,45 @@ class node_iterator
|
||||
...
|
||||
};
|
||||
</pre>
|
||||
<div class="section">
|
||||
<h3><a class="toc-backref" href="#id34" id="template-arguments-for-iterator-facade" name="template-arguments-for-iterator-facade">Template Arguments for <tt class="docutils literal"><span class="pre">iterator_facade</span></tt></a></h3>
|
||||
<div class="section" id="template-arguments-for-iterator-facade">
|
||||
<h3><a class="toc-backref" href="#id34">Template Arguments for <tt class="docutils literal"><span class="pre">iterator_facade</span></tt></a></h3>
|
||||
<p><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> has several template parameters, so we must decide
|
||||
what types to use for the arguments. The parameters are <tt class="docutils literal"><span class="pre">Derived</span></tt>,
|
||||
<tt class="docutils literal"><span class="pre">Value</span></tt>, <tt class="docutils literal"><span class="pre">CategoryOrTraversal</span></tt>, <tt class="docutils literal"><span class="pre">Reference</span></tt>, and <tt class="docutils literal"><span class="pre">Difference</span></tt>.</p>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id35" id="derived" name="derived"><tt class="docutils literal"><span class="pre">Derived</span></tt></a></h4>
|
||||
<div class="section" id="derived">
|
||||
<h4><a class="toc-backref" href="#id35"><tt class="docutils literal"><span class="pre">Derived</span></tt></a></h4>
|
||||
<p>Because <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> is meant to be used with the CRTP
|
||||
<a class="citation-reference" href="#cop95" id="id10" name="id10">[Cop95]</a> the first parameter is the iterator class name itself,
|
||||
<a class="citation-reference" href="#cop95" id="id10">[Cop95]</a> the first parameter is the iterator class name itself,
|
||||
<tt class="docutils literal"><span class="pre">node_iterator</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id36" id="value" name="value"><tt class="docutils literal"><span class="pre">Value</span></tt></a></h4>
|
||||
<div class="section" id="value">
|
||||
<h4><a class="toc-backref" href="#id36"><tt class="docutils literal"><span class="pre">Value</span></tt></a></h4>
|
||||
<p>The <tt class="docutils literal"><span class="pre">Value</span></tt> parameter determines the <tt class="docutils literal"><span class="pre">node_iterator</span></tt>'s
|
||||
<tt class="docutils literal"><span class="pre">value_type</span></tt>. In this case, we are iterating over <tt class="docutils literal"><span class="pre">node_base</span></tt>
|
||||
objects, so <tt class="docutils literal"><span class="pre">Value</span></tt> will be <tt class="docutils literal"><span class="pre">node_base</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id37" id="categoryortraversal" name="categoryortraversal"><tt class="docutils literal"><span class="pre">CategoryOrTraversal</span></tt></a></h4>
|
||||
<p>Now we have to determine which <a class="reference" href="new-iter-concepts.html#iterator-traversal-concepts-lib-iterator-traversal">iterator traversal concept</a> our
|
||||
<div class="section" id="categoryortraversal">
|
||||
<h4><a class="toc-backref" href="#id37"><tt class="docutils literal"><span class="pre">CategoryOrTraversal</span></tt></a></h4>
|
||||
<p>Now we have to determine which <a class="reference external" href="new-iter-concepts.html#iterator-traversal-concepts-lib-iterator-traversal">iterator traversal concept</a> our
|
||||
<tt class="docutils literal"><span class="pre">node_iterator</span></tt> is going to model. Singly-linked lists only have
|
||||
forward links, so our iterator can't can't be a <a class="reference" href="new-iter-concepts.html#bidirectional-traversal-iterators-lib-bidirectional-traversal-iterators">bidirectional
|
||||
forward links, so our iterator can't can't be a <a class="reference external" href="new-iter-concepts.html#bidirectional-traversal-iterators-lib-bidirectional-traversal-iterators">bidirectional
|
||||
traversal iterator</a>. Our iterator should be able to make multiple
|
||||
passes over the same linked list (unlike, say, an
|
||||
<tt class="docutils literal"><span class="pre">istream_iterator</span></tt> which consumes the stream it traverses), so it
|
||||
must be a <a class="reference" href="new-iter-concepts.html#forward-traversal-iterators-lib-forward-traversal-iterators">forward traversal iterator</a>. Therefore, we'll pass
|
||||
<tt class="docutils literal"><span class="pre">boost::forward_traversal_tag</span></tt> in this position <a class="footnote-reference" href="#category" id="id11" name="id11">[1]</a>.</p>
|
||||
must be a <a class="reference external" href="new-iter-concepts.html#forward-traversal-iterators-lib-forward-traversal-iterators">forward traversal iterator</a>. Therefore, we'll pass
|
||||
<tt class="docutils literal"><span class="pre">boost::forward_traversal_tag</span></tt> in this position<a class="footnote-reference" href="#category" id="id11"><sup>1</sup></a>.</p>
|
||||
<table class="docutils footnote" frame="void" id="category" rules="none">
|
||||
<colgroup><col class="label" /><col /></colgroup>
|
||||
<tbody valign="top">
|
||||
<tr><td class="label"><a class="fn-backref" href="#id11" name="category">[1]</a></td><td><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> also supports old-style category
|
||||
<tr><td class="label"><a class="fn-backref" href="#id11">[1]</a></td><td><tt class="docutils literal"><span class="pre">iterator_facade</span></tt> also supports old-style category
|
||||
tags, so we could have passed <tt class="docutils literal"><span class="pre">std::forward_iterator_tag</span></tt> here;
|
||||
either way, the resulting iterator's <tt class="docutils literal"><span class="pre">iterator_category</span></tt> will
|
||||
end up being <tt class="docutils literal"><span class="pre">std::forward_iterator_tag</span></tt>.</td></tr>
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id38" id="id12" name="id12"><tt class="docutils literal"><span class="pre">Reference</span></tt></a></h4>
|
||||
<div class="section" id="id12">
|
||||
<h4><a class="toc-backref" href="#id38"><tt class="docutils literal"><span class="pre">Reference</span></tt></a></h4>
|
||||
<p>The <tt class="docutils literal"><span class="pre">Reference</span></tt> argument becomes the type returned by
|
||||
<tt class="docutils literal"><span class="pre">node_iterator</span></tt>'s dereference operation, and will also be the
|
||||
same as <tt class="docutils literal"><span class="pre">std::iterator_traits<node_iterator>::reference</span></tt>. The
|
||||
@ -1272,8 +990,8 @@ library's default for this parameter is <tt class="docutils literal"><span class
|
||||
<tt class="docutils literal"><span class="pre">node_base&</span></tt> is a good choice for the iterator's <tt class="docutils literal"><span class="pre">reference</span></tt>
|
||||
type, we can omit this argument, or pass <tt class="docutils literal"><span class="pre">use_default</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id39" id="difference" name="difference"><tt class="docutils literal"><span class="pre">Difference</span></tt></a></h4>
|
||||
<div class="section" id="difference">
|
||||
<h4><a class="toc-backref" href="#id39"><tt class="docutils literal"><span class="pre">Difference</span></tt></a></h4>
|
||||
<p>The <tt class="docutils literal"><span class="pre">Difference</span></tt> argument determines how the distance between
|
||||
two <tt class="docutils literal"><span class="pre">node_iterator</span></tt>s will be measured and will also be the
|
||||
same as <tt class="docutils literal"><span class="pre">std::iterator_traits<node_iterator>::difference_type</span></tt>.
|
||||
@ -1299,15 +1017,15 @@ class node_iterator
|
||||
</pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h3><a class="toc-backref" href="#id40" id="constructors-and-data-members" name="constructors-and-data-members">Constructors and Data Members</a></h3>
|
||||
<div class="section" id="constructors-and-data-members">
|
||||
<h3><a class="toc-backref" href="#id40">Constructors and Data Members</a></h3>
|
||||
<p>Next we need to decide how to represent the iterator's position.
|
||||
This representation will take the form of data members, so we'll
|
||||
also need to write constructors to initialize them. The
|
||||
<tt class="docutils literal"><span class="pre">node_iterator</span></tt>'s position is quite naturally represented using
|
||||
a pointer to a <tt class="docutils literal"><span class="pre">node_base</span></tt>. We'll need a constructor to build an
|
||||
iterator from a <tt class="docutils literal"><span class="pre">node_base*</span></tt>, and a default constructor to
|
||||
satisfy the <a class="reference" href="new-iter-concepts.html#forward-traversal-iterators-lib-forward-traversal-iterators">forward traversal iterator</a> requirements <a class="footnote-reference" href="#default" id="id13" name="id13">[2]</a>.
|
||||
satisfy the <a class="reference external" href="new-iter-concepts.html#forward-traversal-iterators-lib-forward-traversal-iterators">forward traversal iterator</a> requirements<a class="footnote-reference" href="#default" id="id13"><sup>2</sup></a>.
|
||||
Our <tt class="docutils literal"><span class="pre">node_iterator</span></tt> then becomes:</p>
|
||||
<pre class="literal-block">
|
||||
# include "node.hpp"
|
||||
@ -1337,20 +1055,20 @@ class node_iterator
|
||||
<table class="docutils footnote" frame="void" id="default" rules="none">
|
||||
<colgroup><col class="label" /><col /></colgroup>
|
||||
<tbody valign="top">
|
||||
<tr><td class="label"><a class="fn-backref" href="#id13" name="default">[2]</a></td><td>Technically, the C++ standard places almost no
|
||||
<tr><td class="label"><a class="fn-backref" href="#id13">[2]</a></td><td>Technically, the C++ standard places almost no
|
||||
requirements on a default-constructed iterator, so if we were
|
||||
really concerned with efficiency, we could've written the
|
||||
default constructor to leave <tt class="docutils literal"><span class="pre">m_node</span></tt> uninitialized.</td></tr>
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h3><a class="toc-backref" href="#id41" id="implementing-the-core-operations" name="implementing-the-core-operations">Implementing the Core Operations</a></h3>
|
||||
<p>The last step is to implement the <a class="reference" href="#core-operations">core operations</a> required by
|
||||
<div class="section" id="implementing-the-core-operations">
|
||||
<h3><a class="toc-backref" href="#id41">Implementing the Core Operations</a></h3>
|
||||
<p>The last step is to implement the <a class="reference internal" href="#core-operations">core operations</a> required by
|
||||
the concepts we want our iterator to model. Referring to the
|
||||
<a class="reference" href="#core-operations">table</a>, we can see that the first three rows are applicable
|
||||
<a class="reference internal" href="#core-operations">table</a>, we can see that the first three rows are applicable
|
||||
because <tt class="docutils literal"><span class="pre">node_iterator</span></tt> needs to satisfy the requirements for
|
||||
<a class="reference" href="new-iter-concepts.html#readable-iterators-lib-readable-iterators">readable iterator</a>, <a class="reference" href="new-iter-concepts.html#single-pass-iterators-lib-single-pass-iterators">single pass iterator</a>, and <a class="reference" href="new-iter-concepts.html#incrementable-iterators-lib-incrementable-iterators">incrementable
|
||||
<a class="reference external" href="new-iter-concepts.html#readable-iterators-lib-readable-iterators">readable iterator</a>, <a class="reference external" href="new-iter-concepts.html#single-pass-iterators-lib-single-pass-iterators">single pass iterator</a>, and <a class="reference external" href="new-iter-concepts.html#incrementable-iterators-lib-incrementable-iterators">incrementable
|
||||
iterator</a>.</p>
|
||||
<p>We therefore need to supply <tt class="docutils literal"><span class="pre">dereference</span></tt>,
|
||||
<tt class="docutils literal"><span class="pre">equal</span></tt>, and <tt class="docutils literal"><span class="pre">increment</span></tt> members. We don't want these members
|
||||
@ -1392,11 +1110,11 @@ class node_iterator
|
||||
};
|
||||
</pre>
|
||||
<p>Voilà; a complete and conforming readable, forward-traversal
|
||||
iterator! For a working example of its use, see <a class="reference" href="../example/node_iterator1.cpp">this program</a>.</p>
|
||||
iterator! For a working example of its use, see <a class="reference external" href="../example/node_iterator1.cpp">this program</a>.</p>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id42" id="a-constant-node-iterator" name="a-constant-node-iterator">A constant <tt class="docutils literal"><span class="pre">node_iterator</span></tt></a></h2>
|
||||
<div class="section" id="a-constant-node-iterator">
|
||||
<h2><a class="toc-backref" href="#id42">A constant <tt class="docutils literal"><span class="pre">node_iterator</span></tt></a></h2>
|
||||
<div class="sidebar">
|
||||
<p class="first sidebar-title">Constant and Mutable iterators</p>
|
||||
<p>The term <strong>mutable iterator</strong> means an iterator through which
|
||||
@ -1496,8 +1214,8 @@ typedef node_iter<node_base> node_iterator;
|
||||
typedef node_iter<node_base const> node_const_iterator;
|
||||
</pre>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id43" id="interoperability" name="interoperability">Interoperability</a></h2>
|
||||
<div class="section" id="interoperability">
|
||||
<h2><a class="toc-backref" href="#id43">Interoperability</a></h2>
|
||||
<p>Our <tt class="docutils literal"><span class="pre">const_node_iterator</span></tt> works perfectly well on its own, but
|
||||
taken together with <tt class="docutils literal"><span class="pre">node_iterator</span></tt> it doesn't quite meet
|
||||
expectations. For example, we'd like to be able to pass a
|
||||
@ -1507,9 +1225,9 @@ just as you can with <tt class="docutils literal"><span class="pre">std::list<
|
||||
<tt class="docutils literal"><span class="pre">node_const_iterator</span></tt> into the same list, we should be able to
|
||||
compare them for equality.</p>
|
||||
<p>This expected ability to use two different iterator types together
|
||||
is known as <a class="reference" href="new-iter-concepts.html#interoperable-iterators-lib-interoperable-iterators"><strong>interoperability</strong></a>. Achieving interoperability in
|
||||
is known as <a class="reference external" href="new-iter-concepts.html#interoperable-iterators-lib-interoperable-iterators"><strong>interoperability</strong></a>. Achieving interoperability in
|
||||
our case is as simple as templatizing the <tt class="docutils literal"><span class="pre">equal</span></tt> function and
|
||||
adding a templatized converting constructor <a class="footnote-reference" href="#broken" id="id16" name="id16">[3]</a> <a class="footnote-reference" href="#random" id="id17" name="id17">[4]</a>:</p>
|
||||
adding a templatized converting constructor<a class="footnote-reference" href="#broken" id="id16"><sup>3</sup></a><a class="footnote-reference" href="#random" id="id17"><sup>4</sup></a>:</p>
|
||||
<pre class="literal-block">
|
||||
template <class Value>
|
||||
class node_iter
|
||||
@ -1554,23 +1272,23 @@ typedef impl::node_iterator<node_base const> node_const_iterator;
|
||||
<table class="docutils footnote" frame="void" id="broken" rules="none">
|
||||
<colgroup><col class="label" /><col /></colgroup>
|
||||
<tbody valign="top">
|
||||
<tr><td class="label"><a class="fn-backref" href="#id16" name="broken">[3]</a></td><td>If you're using an older compiler and it can't handle
|
||||
this example, see the <a class="reference" href="../example/node_iterator2.hpp">example code</a> for workarounds.</td></tr>
|
||||
<tr><td class="label"><a class="fn-backref" href="#id16">[3]</a></td><td>If you're using an older compiler and it can't handle
|
||||
this example, see the <a class="reference external" href="../example/node_iterator2.hpp">example code</a> for workarounds.</td></tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<table class="docutils footnote" frame="void" id="random" rules="none">
|
||||
<colgroup><col class="label" /><col /></colgroup>
|
||||
<tbody valign="top">
|
||||
<tr><td class="label"><a class="fn-backref" href="#id17" name="random">[4]</a></td><td>If <tt class="docutils literal"><span class="pre">node_iterator</span></tt> had been a <a class="reference" href="new-iter-concepts.html#random-access-traversal-iterators-lib-random-access-traversal-iterators">random access
|
||||
<tr><td class="label"><a class="fn-backref" href="#id17">[4]</a></td><td>If <tt class="docutils literal"><span class="pre">node_iterator</span></tt> had been a <a class="reference external" href="new-iter-concepts.html#random-access-traversal-iterators-lib-random-access-traversal-iterators">random access
|
||||
traversal iterator</a>, we'd have had to templatize its
|
||||
<tt class="docutils literal"><span class="pre">distance_to</span></tt> function as well.</td></tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<p>You can see an example program which exercises our interoperable
|
||||
iterators <a class="reference" href="../example/node_iterator2.cpp">here</a>.</p>
|
||||
iterators <a class="reference external" href="../example/node_iterator2.cpp">here</a>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id44" id="telling-the-truth" name="telling-the-truth">Telling the Truth</a></h2>
|
||||
<div class="section" id="telling-the-truth">
|
||||
<h2><a class="toc-backref" href="#id44">Telling the Truth</a></h2>
|
||||
<p>Now <tt class="docutils literal"><span class="pre">node_iterator</span></tt> and <tt class="docutils literal"><span class="pre">node_const_iterator</span></tt> behave exactly as
|
||||
you'd expect... almost. We can compare them and we can convert in
|
||||
one direction: from <tt class="docutils literal"><span class="pre">node_iterator</span></tt> to <tt class="docutils literal"><span class="pre">node_const_iterator</span></tt>.
|
||||
@ -1579,15 +1297,15 @@ If we try to convert from <tt class="docutils literal"><span class="pre">node_co
|
||||
constructor tries to initialize <tt class="docutils literal"><span class="pre">node_iterator</span></tt>'s <tt class="docutils literal"><span class="pre">m_node</span></tt>, a
|
||||
<tt class="docutils literal"><span class="pre">node*</span></tt> with a <tt class="docutils literal"><span class="pre">node</span> <span class="pre">const*</span></tt>. So what's the problem?</p>
|
||||
<p>The problem is that
|
||||
<tt class="docutils literal"><span class="pre">boost::</span></tt><a class="reference" href="../../type_traits/index.html#relationships"><tt class="docutils literal"><span class="pre">is_convertible</span></tt></a><tt class="docutils literal"><span class="pre"><node_const_iterator,node_iterator>::value</span></tt>
|
||||
will be <tt class="docutils literal"><span class="pre">true</span></tt>, but it should be <tt class="docutils literal"><span class="pre">false</span></tt>. <a class="reference" href="../../type_traits/index.html#relationships"><tt class="docutils literal"><span class="pre">is_convertible</span></tt></a>
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
the <tt class="docutils literal"><span class="pre">m_node</span></tt> conversion would fail.</p>
|
||||
<p>In fact, that sort of magic is possible using
|
||||
<a class="reference" href="../../utility/enable_if.html"><tt class="docutils literal"><span class="pre">boost::enable_if</span></tt></a>. By rewriting the converting constructor as
|
||||
<a class="reference external" href="../../utility/enable_if.html"><tt class="docutils literal"><span class="pre">boost::enable_if</span></tt></a>. By rewriting the converting constructor as
|
||||
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|
||||
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|
||||
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|
||||
@ -1611,14 +1329,20 @@ public:
|
||||
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|
||||
</pre>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id45" id="wrap-up" name="wrap-up">Wrap Up</a></h2>
|
||||
<div class="section" id="wrap-up">
|
||||
<h2><a class="toc-backref" href="#id45">Wrap Up</a></h2>
|
||||
<p>This concludes our <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> tutorial, but before you
|
||||
stop reading we urge you to take a look at <a class="reference" href="iterator_adaptor.html"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt></a>.
|
||||
stop reading we urge you to take a look at <a class="reference external" href="iterator_adaptor.html"><tt class="docutils literal"><span class="pre">iterator_adaptor</span></tt></a>.
|
||||
There's another way to approach writing these iterators which might
|
||||
even be superior.</p>
|
||||
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|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="iterator_facade.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
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||||
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|
||||
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doc/iterator_facade_tutorial.rst
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@ -8,7 +8,7 @@ example of a linked list of polymorphic objects. This example was
|
||||
inspired by a `posting`__ by Keith Macdonald on the `Boost-Users`_
|
||||
mailing list.
|
||||
|
||||
.. _`Boost-Users`: ../../../more/mailing_lists.htm#users
|
||||
.. _`Boost-Users`: http://www.boost.org/more/mailing_lists.htm#users
|
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|
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|
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|
||||
</head>
|
||||
<body>
|
||||
<div class="document" id="iterator-traits">
|
||||
@ -303,11 +21,11 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first last reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a></td></tr>
|
||||
<td><a class="first last reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first last reference" href="http://www.boost-consulting.com">Boost Consulting</a></td></tr>
|
||||
<td><a class="first last reference external" href="http://www.boost-consulting.com">Boost Consulting</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams 2004.</td></tr>
|
||||
</tbody>
|
||||
@ -321,21 +39,21 @@ ul.auto-toc {
|
||||
<tbody valign="top">
|
||||
<tr class="field"><th class="field-name">abstract:</th><td class="field-body">Header <tt class="docutils literal"><span class="pre"><boost/iterator/iterator_traits.hpp></span></tt> provides
|
||||
the ability to access an iterator's associated types using
|
||||
MPL-compatible <a class="reference" href="../../mpl/doc/index.html#metafunctions">metafunctions</a>.</td>
|
||||
MPL-compatible <a class="reference external" href="../../mpl/doc/index.html#metafunctions">metafunctions</a>.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="section">
|
||||
<h1><a id="overview" name="overview">Overview</a></h1>
|
||||
<div class="section" id="overview">
|
||||
<h1>Overview</h1>
|
||||
<p><tt class="docutils literal"><span class="pre">std::iterator_traits</span></tt> provides access to five associated types
|
||||
of any iterator: its <tt class="docutils literal"><span class="pre">value_type</span></tt>, <tt class="docutils literal"><span class="pre">reference</span></tt>, <tt class="docutils literal"><span class="pre">pointer</span></tt>,
|
||||
<tt class="docutils literal"><span class="pre">iterator_category</span></tt>, and <tt class="docutils literal"><span class="pre">difference_type</span></tt>. Unfortunately,
|
||||
such a "multi-valued" traits template can be difficult to use in a
|
||||
metaprogramming context. <tt class="docutils literal"><span class="pre"><boost/iterator/iterator_traits.hpp></span></tt>
|
||||
provides access to these types using a standard <a class="reference" href="../../mpl/doc/index.html#metafunctions">metafunctions</a>.</p>
|
||||
provides access to these types using a standard <a class="reference external" href="../../mpl/doc/index.html#metafunctions">metafunctions</a>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a id="summary" name="summary">Summary</a></h1>
|
||||
<div class="section" id="summary">
|
||||
<h1>Summary</h1>
|
||||
<p>Header <tt class="docutils literal"><span class="pre"><boost/iterator/iterator_traits.hpp></span></tt>:</p>
|
||||
<pre class="literal-block">
|
||||
template <class Iterator>
|
||||
@ -380,14 +98,14 @@ struct iterator_category
|
||||
};
|
||||
</pre>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a id="broken-compiler-notes" name="broken-compiler-notes">Broken Compiler Notes</a></h1>
|
||||
<div class="section" id="broken-compiler-notes">
|
||||
<h1>Broken Compiler Notes</h1>
|
||||
<p>Because of workarounds in Boost, you may find that these
|
||||
<a class="reference" href="../../mpl/doc/index.html#metafunctions">metafunctions</a> actually work better than the facilities provided by
|
||||
<a class="reference external" href="../../mpl/doc/index.html#metafunctions">metafunctions</a> actually work better than the facilities provided by
|
||||
your compiler's standard library.</p>
|
||||
<p>On compilers that don't support partial specialization, such as
|
||||
Microsoft Visual C++ 6.0 or 7.0, you may need to manually invoke
|
||||
<a class="reference" href="../../type_traits/index.html#transformations">BOOST_BROKEN_COMPILER_TYPE_TRAITS_SPECIALIZATION</a> on the
|
||||
<a class="reference external" href="../../type_traits/index.html#transformations">BOOST_BROKEN_COMPILER_TYPE_TRAITS_SPECIALIZATION</a> on the
|
||||
<tt class="docutils literal"><span class="pre">value_type</span></tt> of pointers that are passed to these metafunctions.</p>
|
||||
<p>Because of bugs in the implementation of GCC-2.9x, the name of
|
||||
<tt class="docutils literal"><span class="pre">iterator_category</span></tt> is changed to <tt class="docutils literal"><span class="pre">iterator_category_</span></tt> on that
|
||||
@ -395,6 +113,12 @@ compiler. A macro, <tt class="docutils literal"><span class="pre">BOOST_ITERATO
|
||||
either <tt class="docutils literal"><span class="pre">iterator_category</span></tt> or <tt class="docutils literal"><span class="pre">iterator_category_</span></tt>, as
|
||||
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|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="iterator_traits.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
|
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|
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|
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|
||||
|
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<body>
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<div class="document" id="new-iterator-concepts">
|
||||
@ -303,16 +21,16 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams, Jeremy Siek, Thomas Witt</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference" href="mailto:witt@styleadvisor.com">witt@styleadvisor.com</a></td></tr>
|
||||
<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference external" href="mailto:witt@styleadvisor.com">witt@styleadvisor.com</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, <a class="last reference" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr>
|
||||
<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, <a class="last reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2006-04-30</td></tr>
|
||||
<tr class="field"><th class="docinfo-name">Number:</th><td class="field-body">This is a revised version of <a class="reference" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1550.html">n1550</a>=03-0133, which was
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr class="field"><th class="docinfo-name">Number:</th><td class="field-body">This is a revised version of <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1550.html">n1550</a>=03-0133, which was
|
||||
accepted for Technical Report 1 by the C++ standard
|
||||
committee's library working group. This proposal is a
|
||||
revision of paper <a class="reference" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2001/n1297.html">n1297</a>, <a class="reference" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1477.html">n1477</a>, and <a class="reference" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1531.html">n1531</a>.</td>
|
||||
revision of paper <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2001/n1297.html">n1297</a>, <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1477.html">n1477</a>, and <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1531.html">n1531</a>.</td>
|
||||
</tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt
|
||||
@ -336,49 +54,49 @@ of iterators that are used in practice.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first">Table of Contents</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#motivation" id="id1" name="id1">Motivation</a></li>
|
||||
<li><a class="reference" href="#impact-on-the-standard" id="id2" name="id2">Impact on the Standard</a><ul>
|
||||
<li><a class="reference" href="#possible-but-not-proposed-changes-to-the-working-paper" id="id3" name="id3">Possible (but not proposed) Changes to the Working Paper</a><ul>
|
||||
<li><a class="reference" href="#changes-to-algorithm-requirements" id="id4" name="id4">Changes to Algorithm Requirements</a></li>
|
||||
<li><a class="reference" href="#deprecations" id="id5" name="id5">Deprecations</a></li>
|
||||
<li><a class="reference" href="#vector-bool" id="id6" name="id6"><tt class="docutils literal"><span class="pre">vector<bool></span></tt></a></li>
|
||||
<li><a class="reference internal" href="#motivation" id="id1">Motivation</a></li>
|
||||
<li><a class="reference internal" href="#impact-on-the-standard" id="id2">Impact on the Standard</a><ul>
|
||||
<li><a class="reference internal" href="#possible-but-not-proposed-changes-to-the-working-paper" id="id3">Possible (but not proposed) Changes to the Working Paper</a><ul>
|
||||
<li><a class="reference internal" href="#changes-to-algorithm-requirements" id="id4">Changes to Algorithm Requirements</a></li>
|
||||
<li><a class="reference internal" href="#deprecations" id="id5">Deprecations</a></li>
|
||||
<li><a class="reference internal" href="#vector-bool" id="id6"><tt class="docutils literal"><span class="pre">vector<bool></span></tt></a></li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#design" id="id7" name="id7">Design</a></li>
|
||||
<li><a class="reference" href="#proposed-text" id="id8" name="id8">Proposed Text</a><ul>
|
||||
<li><a class="reference" href="#addition-to-lib-iterator-requirements" id="id9" name="id9">Addition to [lib.iterator.requirements]</a><ul>
|
||||
<li><a class="reference" href="#iterator-value-access-concepts-lib-iterator-value-access" id="id10" name="id10">Iterator Value Access Concepts [lib.iterator.value.access]</a><ul>
|
||||
<li><a class="reference" href="#readable-iterators-lib-readable-iterators" id="id11" name="id11">Readable Iterators [lib.readable.iterators]</a></li>
|
||||
<li><a class="reference" href="#writable-iterators-lib-writable-iterators" id="id12" name="id12">Writable Iterators [lib.writable.iterators]</a></li>
|
||||
<li><a class="reference" href="#swappable-iterators-lib-swappable-iterators" id="id13" name="id13">Swappable Iterators [lib.swappable.iterators]</a></li>
|
||||
<li><a class="reference" href="#lvalue-iterators-lib-lvalue-iterators" id="id14" name="id14">Lvalue Iterators [lib.lvalue.iterators]</a></li>
|
||||
<li><a class="reference internal" href="#design" id="id7">Design</a></li>
|
||||
<li><a class="reference internal" href="#proposed-text" id="id8">Proposed Text</a><ul>
|
||||
<li><a class="reference internal" href="#addition-to-lib-iterator-requirements" id="id9">Addition to [lib.iterator.requirements]</a><ul>
|
||||
<li><a class="reference internal" href="#iterator-value-access-concepts-lib-iterator-value-access" id="id10">Iterator Value Access Concepts [lib.iterator.value.access]</a><ul>
|
||||
<li><a class="reference internal" href="#readable-iterators-lib-readable-iterators" id="id11">Readable Iterators [lib.readable.iterators]</a></li>
|
||||
<li><a class="reference internal" href="#writable-iterators-lib-writable-iterators" id="id12">Writable Iterators [lib.writable.iterators]</a></li>
|
||||
<li><a class="reference internal" href="#swappable-iterators-lib-swappable-iterators" id="id13">Swappable Iterators [lib.swappable.iterators]</a></li>
|
||||
<li><a class="reference internal" href="#lvalue-iterators-lib-lvalue-iterators" id="id14">Lvalue Iterators [lib.lvalue.iterators]</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#iterator-traversal-concepts-lib-iterator-traversal" id="id15" name="id15">Iterator Traversal Concepts [lib.iterator.traversal]</a><ul>
|
||||
<li><a class="reference" href="#incrementable-iterators-lib-incrementable-iterators" id="id16" name="id16">Incrementable Iterators [lib.incrementable.iterators]</a></li>
|
||||
<li><a class="reference" href="#single-pass-iterators-lib-single-pass-iterators" id="id17" name="id17">Single Pass Iterators [lib.single.pass.iterators]</a></li>
|
||||
<li><a class="reference" href="#forward-traversal-iterators-lib-forward-traversal-iterators" id="id18" name="id18">Forward Traversal Iterators [lib.forward.traversal.iterators]</a></li>
|
||||
<li><a class="reference" href="#bidirectional-traversal-iterators-lib-bidirectional-traversal-iterators" id="id19" name="id19">Bidirectional Traversal Iterators [lib.bidirectional.traversal.iterators]</a></li>
|
||||
<li><a class="reference" href="#random-access-traversal-iterators-lib-random-access-traversal-iterators" id="id20" name="id20">Random Access Traversal Iterators [lib.random.access.traversal.iterators]</a></li>
|
||||
<li><a class="reference" href="#interoperable-iterators-lib-interoperable-iterators" id="id21" name="id21">Interoperable Iterators [lib.interoperable.iterators]</a></li>
|
||||
<li><a class="reference internal" href="#iterator-traversal-concepts-lib-iterator-traversal" id="id15">Iterator Traversal Concepts [lib.iterator.traversal]</a><ul>
|
||||
<li><a class="reference internal" href="#incrementable-iterators-lib-incrementable-iterators" id="id16">Incrementable Iterators [lib.incrementable.iterators]</a></li>
|
||||
<li><a class="reference internal" href="#single-pass-iterators-lib-single-pass-iterators" id="id17">Single Pass Iterators [lib.single.pass.iterators]</a></li>
|
||||
<li><a class="reference internal" href="#forward-traversal-iterators-lib-forward-traversal-iterators" id="id18">Forward Traversal Iterators [lib.forward.traversal.iterators]</a></li>
|
||||
<li><a class="reference internal" href="#bidirectional-traversal-iterators-lib-bidirectional-traversal-iterators" id="id19">Bidirectional Traversal Iterators [lib.bidirectional.traversal.iterators]</a></li>
|
||||
<li><a class="reference internal" href="#random-access-traversal-iterators-lib-random-access-traversal-iterators" id="id20">Random Access Traversal Iterators [lib.random.access.traversal.iterators]</a></li>
|
||||
<li><a class="reference internal" href="#interoperable-iterators-lib-interoperable-iterators" id="id21">Interoperable Iterators [lib.interoperable.iterators]</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#addition-to-lib-iterator-synopsis" id="id22" name="id22">Addition to [lib.iterator.synopsis]</a></li>
|
||||
<li><a class="reference" href="#addition-to-lib-iterator-traits" id="id23" name="id23">Addition to [lib.iterator.traits]</a></li>
|
||||
<li><a class="reference internal" href="#addition-to-lib-iterator-synopsis" id="id22">Addition to [lib.iterator.synopsis]</a></li>
|
||||
<li><a class="reference internal" href="#addition-to-lib-iterator-traits" id="id23">Addition to [lib.iterator.traits]</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#footnotes" id="id24" name="id24">Footnotes</a></li>
|
||||
<li><a class="reference internal" href="#footnotes" id="id24">Footnotes</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id1" id="motivation" name="motivation">Motivation</a></h1>
|
||||
<div class="section" id="motivation">
|
||||
<h1><a class="toc-backref" href="#id1">Motivation</a></h1>
|
||||
<p>The standard iterator categories and requirements are flawed because
|
||||
they use a single hierarchy of concepts to address two orthogonal
|
||||
issues: <em>iterator traversal</em> and <em>value access</em>. As a result, many
|
||||
@ -409,12 +127,12 @@ requirements in the iterator categories.</p>
|
||||
<td><tt class="docutils literal"><span class="pre">*i</span></tt> is convertible to <tt class="docutils literal"><span class="pre">T</span></tt></td>
|
||||
</tr>
|
||||
<tr><td>Forward Iterator</td>
|
||||
<td><tt class="docutils literal"><span class="pre">*i</span></tt> is <tt class="docutils literal"><span class="pre">T&</span></tt> (or <tt class="docutils literal"><span class="pre">const</span> <span class="pre">T&</span></tt> once <a class="reference" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#200">issue 200</a>
|
||||
<td><tt class="docutils literal"><span class="pre">*i</span></tt> is <tt class="docutils literal"><span class="pre">T&</span></tt> (or <tt class="docutils literal"><span class="pre">const</span> <span class="pre">T&</span></tt> once <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#200">issue 200</a>
|
||||
is resolved)</td>
|
||||
</tr>
|
||||
<tr><td>Random Access Iterator</td>
|
||||
<td><tt class="docutils literal"><span class="pre">i[n]</span></tt> is convertible to <tt class="docutils literal"><span class="pre">T</span></tt> (also <tt class="docutils literal"><span class="pre">i[n]</span> <span class="pre">=</span> <span class="pre">t</span></tt>
|
||||
is required for mutable iterators once <a class="reference" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#299">issue 299</a>
|
||||
is required for mutable iterators once <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#299">issue 299</a>
|
||||
is resolved)</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
@ -423,7 +141,7 @@ is resolved)</td>
|
||||
single hierarchy, many useful iterators can not be appropriately
|
||||
categorized. For example, <tt class="docutils literal"><span class="pre">vector<bool>::iterator</span></tt> is almost a
|
||||
random access iterator, but the return type is not <tt class="docutils literal"><span class="pre">bool&</span></tt> (see
|
||||
<a class="reference" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#96">issue 96</a> and Herb Sutter's paper J16/99-0008 = WG21
|
||||
<a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#96">issue 96</a> and Herb Sutter's paper J16/99-0008 = WG21
|
||||
N1185). Therefore, the iterators of <tt class="docutils literal"><span class="pre">vector<bool></span></tt> only meet the
|
||||
requirements of input iterator and output iterator. This is so
|
||||
nonintuitive that the C++ standard contradicts itself on this point.
|
||||
@ -431,7 +149,7 @@ In paragraph 23.2.4/1 it says that a <tt class="docutils literal"><span class="p
|
||||
supports random access iterators.</p>
|
||||
<p>Another difficult-to-categorize iterator is the transform iterator, an
|
||||
adaptor which applies a unary function object to the dereferenced
|
||||
value of the some underlying iterator (see <a class="reference" href="http://www.boost.org/libs/utility/transform_iterator.htm">transform_iterator</a>).
|
||||
value of the some underlying iterator (see <a class="reference external" href="http://www.boost.org/libs/utility/transform_iterator.htm">transform_iterator</a>).
|
||||
For unary functions such as <tt class="docutils literal"><span class="pre">times</span></tt>, the return type of
|
||||
<tt class="docutils literal"><span class="pre">operator*</span></tt> clearly needs to be the <tt class="docutils literal"><span class="pre">result_type</span></tt> of the function
|
||||
object, which is typically not a reference. Because random access
|
||||
@ -439,13 +157,13 @@ iterators are required to return lvalues from <tt class="docutils literal"><span
|
||||
wrap <tt class="docutils literal"><span class="pre">int*</span></tt> with a transform iterator, you do not get a random
|
||||
access iterator as might be expected, but an input iterator.</p>
|
||||
<p>A third example is found in the vertex and edge iterators of the
|
||||
<a class="reference" href="http://www.boost.org/libs/graph/doc/table_of_contents.html">Boost Graph Library</a>. These iterators return vertex and edge
|
||||
<a class="reference external" href="http://www.boost.org/libs/graph/doc/table_of_contents.html">Boost Graph Library</a>. These iterators return vertex and edge
|
||||
descriptors, which are lightweight handles created on-the-fly. They
|
||||
must be returned by-value. As a result, their current standard
|
||||
iterator category is <tt class="docutils literal"><span class="pre">input_iterator_tag</span></tt>, which means that,
|
||||
strictly speaking, you could not use these iterators with algorithms
|
||||
like <tt class="docutils literal"><span class="pre">min_element()</span></tt>. As a temporary solution, the concept
|
||||
<a class="reference" href="http://www.boost.org/libs/utility/MultiPassInputIterator.html">Multi-Pass Input Iterator</a> was introduced to describe the vertex and
|
||||
<a class="reference external" href="http://www.boost.org/libs/utility/MultiPassInputIterator.html">Multi-Pass Input Iterator</a> was introduced to describe the vertex and
|
||||
edge descriptors, but as the design notes for the concept suggest, a
|
||||
better solution is needed.</p>
|
||||
<p>In short, there are many useful iterators that do not fit into the
|
||||
@ -458,8 +176,8 @@ cannot separate the need for random access or bidirectional
|
||||
traversal from the need for a true reference return type.</li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id2" id="impact-on-the-standard" name="impact-on-the-standard">Impact on the Standard</a></h1>
|
||||
<div class="section" id="impact-on-the-standard">
|
||||
<h1><a class="toc-backref" href="#id2">Impact on the Standard</a></h1>
|
||||
<p>This proposal for TR1 is a pure extension. Further, the new iterator
|
||||
concepts are backward-compatible with the old iterator requirements,
|
||||
and old iterators are forward-compatible with the new iterator
|
||||
@ -474,13 +192,13 @@ made it). -DWA -->
|
||||
standards conforming input iterator is allowed to have
|
||||
a tag that is not input_iterator_tag but that
|
||||
is convertible to input_iterator_tag? -JGS -->
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id3" id="possible-but-not-proposed-changes-to-the-working-paper" name="possible-but-not-proposed-changes-to-the-working-paper">Possible (but not proposed) Changes to the Working Paper</a></h2>
|
||||
<div class="section" id="possible-but-not-proposed-changes-to-the-working-paper">
|
||||
<h2><a class="toc-backref" href="#id3">Possible (but not proposed) Changes to the Working Paper</a></h2>
|
||||
<p>The extensions in this paper suggest several changes we might make
|
||||
to the working paper for the next standard. These changes are not
|
||||
a formal part of this proposal for TR1.</p>
|
||||
<div class="section">
|
||||
<h3><a class="toc-backref" href="#id4" id="changes-to-algorithm-requirements" name="changes-to-algorithm-requirements">Changes to Algorithm Requirements</a></h3>
|
||||
<div class="section" id="changes-to-algorithm-requirements">
|
||||
<h3><a class="toc-backref" href="#id4">Changes to Algorithm Requirements</a></h3>
|
||||
<p>The algorithms in the standard library could benefit from the new
|
||||
iterator concepts because the new concepts provide a more accurate way
|
||||
to express their type requirements. The result is algorithms that are
|
||||
@ -544,15 +262,15 @@ Bidirectional Iterator (2) -> Bidirectional Traversal Iterator and Writable I
|
||||
<dd><tt class="docutils literal"><span class="pre">transform</span></tt></dd>
|
||||
</dl>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h3><a class="toc-backref" href="#id5" id="deprecations" name="deprecations">Deprecations</a></h3>
|
||||
<div class="section" id="deprecations">
|
||||
<h3><a class="toc-backref" href="#id5">Deprecations</a></h3>
|
||||
<p>For the next working paper (but not for TR1), the committee should
|
||||
consider deprecating the old iterator tags, and
|
||||
std::iterator_traits, since it will be superceded by individual
|
||||
traits metafunctions.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h3><a class="toc-backref" href="#id6" id="vector-bool" name="vector-bool"><tt class="docutils literal"><span class="pre">vector<bool></span></tt></a></h3>
|
||||
<div class="section" id="vector-bool">
|
||||
<h3><a class="toc-backref" href="#id6"><tt class="docutils literal"><span class="pre">vector<bool></span></tt></a></h3>
|
||||
<p>For the next working paper (but not for TR1), the committee should
|
||||
consider reclassifying <tt class="docutils literal"><span class="pre">vector<bool>::iterator</span></tt> as a Random
|
||||
Access Traversal Iterator and Readable Iterator and Writable
|
||||
@ -560,8 +278,8 @@ Iterator.</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id7" id="design" name="design">Design</a></h1>
|
||||
<div class="section" id="design">
|
||||
<h1><a class="toc-backref" href="#id7">Design</a></h1>
|
||||
<p>The iterator requirements are to be separated into two groups. One set
|
||||
of concepts handles the syntax and semantics of value access:</p>
|
||||
<ul class="simple">
|
||||
@ -626,24 +344,24 @@ approach for specifying <tt class="docutils literal"><span class="pre">operator[
|
||||
direction would mean that an iterator satisfying the old Random Access
|
||||
Iterator requirements would not necessarily be a model of Readable or
|
||||
Writable Lvalue Iterator. Instead we have chosen a design that
|
||||
matches the preferred resolution of <a class="reference" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#299">issue 299</a>: <tt class="docutils literal"><span class="pre">operator[]</span></tt> is
|
||||
matches the preferred resolution of <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#299">issue 299</a>: <tt class="docutils literal"><span class="pre">operator[]</span></tt> is
|
||||
only required to return something convertible to the <tt class="docutils literal"><span class="pre">value_type</span></tt>
|
||||
(for a Readable Iterator), and is required to support assignment
|
||||
<tt class="docutils literal"><span class="pre">i[n]</span> <span class="pre">=</span> <span class="pre">t</span></tt> (for a Writable Iterator).</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id8" id="proposed-text" name="proposed-text">Proposed Text</a></h1>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id9" id="addition-to-lib-iterator-requirements" name="addition-to-lib-iterator-requirements">Addition to [lib.iterator.requirements]</a></h2>
|
||||
<div class="section">
|
||||
<h3><a class="toc-backref" href="#id10" id="iterator-value-access-concepts-lib-iterator-value-access" name="iterator-value-access-concepts-lib-iterator-value-access">Iterator Value Access Concepts [lib.iterator.value.access]</a></h3>
|
||||
<div class="section" id="proposed-text">
|
||||
<h1><a class="toc-backref" href="#id8">Proposed Text</a></h1>
|
||||
<div class="section" id="addition-to-lib-iterator-requirements">
|
||||
<h2><a class="toc-backref" href="#id9">Addition to [lib.iterator.requirements]</a></h2>
|
||||
<div class="section" id="iterator-value-access-concepts-lib-iterator-value-access">
|
||||
<h3><a class="toc-backref" href="#id10">Iterator Value Access Concepts [lib.iterator.value.access]</a></h3>
|
||||
<p>In the tables below, <tt class="docutils literal"><span class="pre">X</span></tt> is an iterator type, <tt class="docutils literal"><span class="pre">a</span></tt> is a constant
|
||||
object of type <tt class="docutils literal"><span class="pre">X</span></tt>, <tt class="docutils literal"><span class="pre">R</span></tt> is
|
||||
<tt class="docutils literal"><span class="pre">std::iterator_traits<X>::reference</span></tt>, <tt class="docutils literal"><span class="pre">T</span></tt> is
|
||||
<tt class="docutils literal"><span class="pre">std::iterator_traits<X>::value_type</span></tt>, and <tt class="docutils literal"><span class="pre">v</span></tt> is a constant
|
||||
object of type <tt class="docutils literal"><span class="pre">T</span></tt>.</p>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id11" id="readable-iterators-lib-readable-iterators" name="readable-iterators-lib-readable-iterators"><span id="readable-iterator"></span>Readable Iterators [lib.readable.iterators]</a></h4>
|
||||
<div class="section" id="readable-iterators-lib-readable-iterators">
|
||||
<span id="readable-iterator"></span><h4><a class="toc-backref" href="#id11">Readable Iterators [lib.readable.iterators]</a></h4>
|
||||
<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Readable Iterator</em> concept
|
||||
for value type <tt class="docutils literal"><span class="pre">T</span></tt> if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> being Assignable and
|
||||
Copy Constructible, the following expressions are valid and respect
|
||||
@ -685,8 +403,8 @@ non-cv-qualified type</td>
|
||||
</table>
|
||||
<!-- We won't say anything about iterator_traits<X>::reference until the DR is resolved. -JGS -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id12" id="writable-iterators-lib-writable-iterators" name="writable-iterators-lib-writable-iterators"><span id="writable-iterator"></span>Writable Iterators [lib.writable.iterators]</a></h4>
|
||||
<div class="section" id="writable-iterators-lib-writable-iterators">
|
||||
<span id="writable-iterator"></span><h4><a class="toc-backref" href="#id12">Writable Iterators [lib.writable.iterators]</a></h4>
|
||||
<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Writable Iterator</em> concept
|
||||
if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> being Copy Constructible, the following
|
||||
expressions are valid and respect the stated semantics. Writable
|
||||
@ -715,8 +433,8 @@ value types of <tt class="docutils literal"><span class="pre">X</span></tt></td>
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id13" id="swappable-iterators-lib-swappable-iterators" name="swappable-iterators-lib-swappable-iterators">Swappable Iterators [lib.swappable.iterators]</a></h4>
|
||||
<div class="section" id="swappable-iterators-lib-swappable-iterators">
|
||||
<h4><a class="toc-backref" href="#id13">Swappable Iterators [lib.swappable.iterators]</a></h4>
|
||||
<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Swappable Iterator</em> concept
|
||||
if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> being Copy Constructible, the following
|
||||
expressions are valid and respect the stated semantics.</p>
|
||||
@ -742,12 +460,12 @@ exchanged</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<p>[<em>Note:</em> An iterator that is a model of the <a class="reference" href="#readable-iterator">Readable Iterator</a> and
|
||||
<a class="reference" href="#writable-iterator">Writable Iterator</a> concepts is also a model of <em>Swappable
|
||||
<p>[<em>Note:</em> An iterator that is a model of the <a class="reference internal" href="#readable-iterator">Readable Iterator</a> and
|
||||
<a class="reference internal" href="#writable-iterator">Writable Iterator</a> concepts is also a model of <em>Swappable
|
||||
Iterator</em>. <em>--end note</em>]</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id14" id="lvalue-iterators-lib-lvalue-iterators" name="lvalue-iterators-lib-lvalue-iterators">Lvalue Iterators [lib.lvalue.iterators]</a></h4>
|
||||
<div class="section" id="lvalue-iterators-lib-lvalue-iterators">
|
||||
<h4><a class="toc-backref" href="#id14">Lvalue Iterators [lib.lvalue.iterators]</a></h4>
|
||||
<p>The <em>Lvalue Iterator</em> concept adds the requirement that the return
|
||||
type of <tt class="docutils literal"><span class="pre">operator*</span></tt> type be a reference to the value type of the
|
||||
iterator.</p>
|
||||
@ -776,20 +494,20 @@ dereferenceable.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<p>If <tt class="docutils literal"><span class="pre">X</span></tt> is a <a class="reference" href="#writable-iterator">Writable Iterator</a> then <tt class="docutils literal"><span class="pre">a</span> <span class="pre">==</span> <span class="pre">b</span></tt> if and only if
|
||||
<tt class="docutils literal"><span class="pre">*a</span></tt> is the same object as <tt class="docutils literal"><span class="pre">*b</span></tt>. If <tt class="docutils literal"><span class="pre">X</span></tt> is a <a class="reference" href="#readable-iterator">Readable
|
||||
<p>If <tt class="docutils literal"><span class="pre">X</span></tt> is a <a class="reference internal" href="#writable-iterator">Writable Iterator</a> then <tt class="docutils literal"><span class="pre">a</span> <span class="pre">==</span> <span class="pre">b</span></tt> if and only if
|
||||
<tt class="docutils literal"><span class="pre">*a</span></tt> is the same object as <tt class="docutils literal"><span class="pre">*b</span></tt>. If <tt class="docutils literal"><span class="pre">X</span></tt> is a <a class="reference internal" href="#readable-iterator">Readable
|
||||
Iterator</a> then <tt class="docutils literal"><span class="pre">a</span> <span class="pre">==</span> <span class="pre">b</span></tt> implies <tt class="docutils literal"><span class="pre">*a</span></tt> is the same object as
|
||||
<tt class="docutils literal"><span class="pre">*b</span></tt>.</p>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h3><a class="toc-backref" href="#id15" id="iterator-traversal-concepts-lib-iterator-traversal" name="iterator-traversal-concepts-lib-iterator-traversal">Iterator Traversal Concepts [lib.iterator.traversal]</a></h3>
|
||||
<div class="section" id="iterator-traversal-concepts-lib-iterator-traversal">
|
||||
<h3><a class="toc-backref" href="#id15">Iterator Traversal Concepts [lib.iterator.traversal]</a></h3>
|
||||
<p>In the tables below, <tt class="docutils literal"><span class="pre">X</span></tt> is an iterator type, <tt class="docutils literal"><span class="pre">a</span></tt> and <tt class="docutils literal"><span class="pre">b</span></tt> are
|
||||
constant objects of type <tt class="docutils literal"><span class="pre">X</span></tt>, <tt class="docutils literal"><span class="pre">r</span></tt> and <tt class="docutils literal"><span class="pre">s</span></tt> are mutable objects of
|
||||
type <tt class="docutils literal"><span class="pre">X</span></tt>, <tt class="docutils literal"><span class="pre">T</span></tt> is <tt class="docutils literal"><span class="pre">std::iterator_traits<X>::value_type</span></tt>, and
|
||||
<tt class="docutils literal"><span class="pre">v</span></tt> is a constant object of type <tt class="docutils literal"><span class="pre">T</span></tt>.</p>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id16" id="incrementable-iterators-lib-incrementable-iterators" name="incrementable-iterators-lib-incrementable-iterators">Incrementable Iterators [lib.incrementable.iterators]</a></h4>
|
||||
<div class="section" id="incrementable-iterators-lib-incrementable-iterators">
|
||||
<h4><a class="toc-backref" href="#id16">Incrementable Iterators [lib.incrementable.iterators]</a></h4>
|
||||
<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Incrementable Iterator</em>
|
||||
concept if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> being Assignable and Copy
|
||||
Constructible, the following expressions are valid and respect the
|
||||
@ -828,16 +546,16 @@ stated semantics.</p>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<p>If <tt class="docutils literal"><span class="pre">X</span></tt> is a <a class="reference" href="#writable-iterator">Writable Iterator</a> then <tt class="docutils literal"><span class="pre">X</span> <span class="pre">a(r++);</span></tt> is equivalent
|
||||
<p>If <tt class="docutils literal"><span class="pre">X</span></tt> is a <a class="reference internal" href="#writable-iterator">Writable Iterator</a> then <tt class="docutils literal"><span class="pre">X</span> <span class="pre">a(r++);</span></tt> is equivalent
|
||||
to <tt class="docutils literal"><span class="pre">X</span> <span class="pre">a(r);</span> <span class="pre">++r;</span></tt> and <tt class="docutils literal"><span class="pre">*r++</span> <span class="pre">=</span> <span class="pre">o</span></tt> is equivalent
|
||||
to <tt class="docutils literal"><span class="pre">*r</span> <span class="pre">=</span> <span class="pre">o;</span> <span class="pre">++r</span></tt>.
|
||||
If <tt class="docutils literal"><span class="pre">X</span></tt> is a <a class="reference" href="#readable-iterator">Readable Iterator</a> then <tt class="docutils literal"><span class="pre">T</span> <span class="pre">z(*r++);</span></tt> is equivalent
|
||||
If <tt class="docutils literal"><span class="pre">X</span></tt> is a <a class="reference internal" href="#readable-iterator">Readable Iterator</a> then <tt class="docutils literal"><span class="pre">T</span> <span class="pre">z(*r++);</span></tt> is equivalent
|
||||
to <tt class="docutils literal"><span class="pre">T</span> <span class="pre">z(*r);</span> <span class="pre">++r;</span></tt>.</p>
|
||||
<!-- TR1: incrementable_iterator_tag changed to
|
||||
incrementable_traversal_tag for consistency. -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id17" id="single-pass-iterators-lib-single-pass-iterators" name="single-pass-iterators-lib-single-pass-iterators">Single Pass Iterators [lib.single.pass.iterators]</a></h4>
|
||||
<div class="section" id="single-pass-iterators-lib-single-pass-iterators">
|
||||
<h4><a class="toc-backref" href="#id17">Single Pass Iterators [lib.single.pass.iterators]</a></h4>
|
||||
<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Single Pass Iterator</em>
|
||||
concept if the following expressions are valid and respect the stated
|
||||
semantics.</p>
|
||||
@ -849,7 +567,8 @@ semantics.</p>
|
||||
<col width="25%" />
|
||||
</colgroup>
|
||||
<thead valign="bottom">
|
||||
<tr><th class="head" colspan="4">Single Pass Iterator Requirements (in addition to Incrementable Iterator and Equality Comparable)</th>
|
||||
<tr><th class="head" colspan="4">Single Pass Iterator Requirements (in addition to Incrementable Iterator and Equality
|
||||
Comparable)</th>
|
||||
</tr>
|
||||
<tr><th class="head">Expression</th>
|
||||
<th class="head">Return Type</th>
|
||||
@ -897,8 +616,8 @@ between iterators</td>
|
||||
<!-- TR1: single_pass_iterator_tag changed to
|
||||
single_pass_traversal_tag for consistency -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id18" id="forward-traversal-iterators-lib-forward-traversal-iterators" name="forward-traversal-iterators-lib-forward-traversal-iterators">Forward Traversal Iterators [lib.forward.traversal.iterators]</a></h4>
|
||||
<div class="section" id="forward-traversal-iterators-lib-forward-traversal-iterators">
|
||||
<h4><a class="toc-backref" href="#id18">Forward Traversal Iterators [lib.forward.traversal.iterators]</a></h4>
|
||||
<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Forward Traversal Iterator</em>
|
||||
concept if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> meeting the requirements of Default
|
||||
Constructible and Single Pass Iterator, the following expressions are
|
||||
@ -939,8 +658,8 @@ dereferenceable implies
|
||||
<!-- TR1: forward_traversal_iterator_tag changed to
|
||||
forward_traversal_tag for consistency -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id19" id="bidirectional-traversal-iterators-lib-bidirectional-traversal-iterators" name="bidirectional-traversal-iterators-lib-bidirectional-traversal-iterators">Bidirectional Traversal Iterators [lib.bidirectional.traversal.iterators]</a></h4>
|
||||
<div class="section" id="bidirectional-traversal-iterators-lib-bidirectional-traversal-iterators">
|
||||
<h4><a class="toc-backref" href="#id19">Bidirectional Traversal Iterators [lib.bidirectional.traversal.iterators]</a></h4>
|
||||
<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Bidirectional Traversal
|
||||
Iterator</em> concept if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> meeting the requirements of
|
||||
Forward Traversal Iterator, the following expressions are valid and
|
||||
@ -1002,8 +721,8 @@ implies <tt class="docutils literal"><span class="pre">r</span> <span class="pre
|
||||
<!-- TR1: bidirectional_traversal_iterator_tag changed to
|
||||
bidirectional_traversal_tag for consistency -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id20" id="random-access-traversal-iterators-lib-random-access-traversal-iterators" name="random-access-traversal-iterators-lib-random-access-traversal-iterators">Random Access Traversal Iterators [lib.random.access.traversal.iterators]</a></h4>
|
||||
<div class="section" id="random-access-traversal-iterators-lib-random-access-traversal-iterators">
|
||||
<h4><a class="toc-backref" href="#id20">Random Access Traversal Iterators [lib.random.access.traversal.iterators]</a></h4>
|
||||
<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Random Access Traversal
|
||||
Iterator</em> concept if the following expressions are valid and respect
|
||||
the stated semantics. In the table below, <tt class="docutils literal"><span class="pre">Distance</span></tt> is
|
||||
@ -1074,13 +793,13 @@ value <tt class="docutils literal"><span class="pre">n</span></tt> of
|
||||
<tr><td><tt class="docutils literal"><span class="pre">a[n]</span></tt></td>
|
||||
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|
||||
<td><tt class="docutils literal"><span class="pre">*(a</span> <span class="pre">+</span> <span class="pre">n)</span></tt></td>
|
||||
<td>pre: a is a <a class="reference" href="#readable-iterator">Readable
|
||||
<td>pre: a is a <a class="reference internal" href="#readable-iterator">Readable
|
||||
Iterator</a></td>
|
||||
</tr>
|
||||
<tr><td><tt class="docutils literal"><span class="pre">a[n]</span> <span class="pre">=</span> <span class="pre">v</span></tt></td>
|
||||
<td>convertible to T</td>
|
||||
<td><tt class="docutils literal"><span class="pre">*(a</span> <span class="pre">+</span> <span class="pre">n)</span> <span class="pre">=</span> <span class="pre">v</span></tt></td>
|
||||
<td>pre: a is a <a class="reference" href="#writable-iterator">Writable
|
||||
<td>pre: a is a <a class="reference internal" href="#writable-iterator">Writable
|
||||
Iterator</a></td>
|
||||
</tr>
|
||||
<tr><td><tt class="docutils literal"><span class="pre">a</span> <span class="pre"><</span> <span class="pre">b</span></tt></td>
|
||||
@ -1116,8 +835,8 @@ ordering relation</td>
|
||||
<!-- TR1: random_access_traversal_iterator_tag changed to
|
||||
random_access_traversal_tag for consistency -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h4><a class="toc-backref" href="#id21" id="interoperable-iterators-lib-interoperable-iterators" name="interoperable-iterators-lib-interoperable-iterators">Interoperable Iterators [lib.interoperable.iterators]</a></h4>
|
||||
<div class="section" id="interoperable-iterators-lib-interoperable-iterators">
|
||||
<h4><a class="toc-backref" href="#id21">Interoperable Iterators [lib.interoperable.iterators]</a></h4>
|
||||
<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> that models Single Pass Iterator is
|
||||
<em>interoperable with</em> a class or built-in type <tt class="docutils literal"><span class="pre">Y</span></tt> that also models
|
||||
Single Pass Iterator if the following expressions are valid and
|
||||
@ -1240,8 +959,8 @@ the following additional requirements must be met.</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id22" id="addition-to-lib-iterator-synopsis" name="addition-to-lib-iterator-synopsis">Addition to [lib.iterator.synopsis]</a></h2>
|
||||
<div class="section" id="addition-to-lib-iterator-synopsis">
|
||||
<h2><a class="toc-backref" href="#id22">Addition to [lib.iterator.synopsis]</a></h2>
|
||||
<pre class="literal-block">
|
||||
// lib.iterator.traits, traits and tags
|
||||
template <class Iterator> struct is_readable_iterator;
|
||||
@ -1254,10 +973,10 @@ struct bidirectional_traversal_tag : forward_traversal_tag { };
|
||||
struct random_access_traversal_tag : bidirectional_traversal_tag { };
|
||||
</pre>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id23" id="addition-to-lib-iterator-traits" name="addition-to-lib-iterator-traits">Addition to [lib.iterator.traits]</a></h2>
|
||||
<div class="section" id="addition-to-lib-iterator-traits">
|
||||
<h2><a class="toc-backref" href="#id23">Addition to [lib.iterator.traits]</a></h2>
|
||||
<p>The <tt class="docutils literal"><span class="pre">is_readable_iterator</span></tt> class
|
||||
template satisfies the <a class="reference" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1519.htm">UnaryTypeTrait</a> requirements.</p>
|
||||
template satisfies the <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1519.htm">UnaryTypeTrait</a> requirements.</p>
|
||||
<p>Given an iterator type <tt class="docutils literal"><span class="pre">X</span></tt>, <tt class="docutils literal"><span class="pre">is_readable_iterator<X>::value</span></tt>
|
||||
yields <tt class="docutils literal"><span class="pre">true</span></tt> if, for an object <tt class="docutils literal"><span class="pre">a</span></tt> of type <tt class="docutils literal"><span class="pre">X</span></tt>, <tt class="docutils literal"><span class="pre">*a</span></tt> is
|
||||
convertible to <tt class="docutils literal"><span class="pre">iterator_traits<X>::value_type</span></tt>, and <tt class="docutils literal"><span class="pre">false</span></tt>
|
||||
@ -1286,9 +1005,9 @@ otherwise.</p>
|
||||
</pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id24" id="footnotes" name="footnotes">Footnotes</a></h1>
|
||||
<p>The UnaryTypeTrait concept is defined in <a class="reference" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1519.htm">n1519</a>; the LWG is
|
||||
<div class="section" id="footnotes">
|
||||
<h1><a class="toc-backref" href="#id24">Footnotes</a></h1>
|
||||
<p>The UnaryTypeTrait concept is defined in <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1519.htm">n1519</a>; the LWG is
|
||||
considering adding the requirement that specializations are derived
|
||||
from their nested <tt class="docutils literal"><span class="pre">::type</span></tt>.</p>
|
||||
<!-- LocalWords: Abrahams Siek Witt const bool Sutter's WG int UL LI href Lvalue
|
||||
@ -1299,6 +1018,12 @@ LocalWords: RandomAccessTraversalIterator dereferenceable Incrementable tmp
|
||||
LocalWords: incrementable xxx min prev inplace png oldeqnew AccessTag struct
|
||||
LocalWords: TraversalTag typename lvalues DWA Hmm JGS mis enum -->
|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="new-iter-concepts.rst">View document source</a>.
|
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Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
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0
doc/new-iter-concepts.pdf
Executable file → Normal file
0
doc/new-iter-concepts.pdf
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<meta name="author" content="Toon Knapen, David Abrahams, Roland Richter, Jeremy Siek" />
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<meta name="date" content="2004-11-01" />
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|
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|
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|
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|
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|
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|
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<link rel="stylesheet" href="../../../rst.css" type="text/css" />
|
||||
</head>
|
||||
<body>
|
||||
<div class="document" id="permutation-iterator">
|
||||
@ -303,12 +21,12 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>Toon Knapen, David Abrahams, Roland Richter, Jeremy Siek</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="last reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a></td></tr>
|
||||
<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="last reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="last reference" href="http://www.osl.iu.edu">Open Systems
|
||||
<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="last reference external" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright Toon Knapen, David Abrahams, Roland Richter, and Jeremy Siek 2003.</td></tr>
|
||||
</tbody>
|
||||
@ -329,21 +47,21 @@ in a potentially different order.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first">Table of Contents</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#introduction" id="id2" name="id2">Introduction</a></li>
|
||||
<li><a class="reference" href="#reference" id="id3" name="id3">Reference</a><ul>
|
||||
<li><a class="reference" href="#permutation-iterator-requirements" id="id4" name="id4"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference" href="#permutation-iterator-models" id="id5" name="id5"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference" href="#permutation-iterator-operations" id="id6" name="id6"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference internal" href="#introduction" id="id2">Introduction</a></li>
|
||||
<li><a class="reference internal" href="#reference" id="id3">Reference</a><ul>
|
||||
<li><a class="reference internal" href="#permutation-iterator-requirements" id="id4"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference internal" href="#permutation-iterator-models" id="id5"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference internal" href="#permutation-iterator-operations" id="id6"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> operations</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#example" id="id7" name="id7">Example</a></li>
|
||||
<li><a class="reference internal" href="#example" id="id7">Example</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id2" id="introduction" name="introduction">Introduction</a></h1>
|
||||
<div class="section" id="introduction">
|
||||
<h1><a class="toc-backref" href="#id2">Introduction</a></h1>
|
||||
<!-- Copyright David Abrahams 2006. 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) -->
|
||||
@ -365,8 +83,8 @@ to be unique. In this same context, it must be noted that the past the
|
||||
end permutation iterator is completely defined by means of the
|
||||
past-the-end iterator to the indices.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id3" id="reference" name="reference">Reference</a></h1>
|
||||
<div class="section" id="reference">
|
||||
<h1><a class="toc-backref" href="#id3">Reference</a></h1>
|
||||
<!-- Copyright David Abrahams 2006. 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) -->
|
||||
@ -401,15 +119,15 @@ template <class ElementIterator, class IndexIterator>
|
||||
permutation_iterator<ElementIterator, IndexIterator>
|
||||
make_permutation_iterator( ElementIterator e, IndexIterator i);
|
||||
</pre>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id4" id="permutation-iterator-requirements" name="permutation-iterator-requirements"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> requirements</a></h2>
|
||||
<div class="section" id="permutation-iterator-requirements">
|
||||
<h2><a class="toc-backref" href="#id4"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> requirements</a></h2>
|
||||
<p><tt class="docutils literal"><span class="pre">ElementIterator</span></tt> shall model Random Access Traversal Iterator.
|
||||
<tt class="docutils literal"><span class="pre">IndexIterator</span></tt> shall model Readable Iterator. The value type of
|
||||
the <tt class="docutils literal"><span class="pre">IndexIterator</span></tt> must be convertible to the difference type of
|
||||
<tt class="docutils literal"><span class="pre">ElementIterator</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id5" id="permutation-iterator-models" name="permutation-iterator-models"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models</a></h2>
|
||||
<div class="section" id="permutation-iterator-models">
|
||||
<h2><a class="toc-backref" href="#id5"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models</a></h2>
|
||||
<p><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models the same iterator traversal concepts
|
||||
as <tt class="docutils literal"><span class="pre">IndexIterator</span></tt> and the same iterator access concepts as
|
||||
<tt class="docutils literal"><span class="pre">ElementIterator</span></tt>.</p>
|
||||
@ -430,8 +148,8 @@ with <tt class="docutils literal"><span class="pre">permutation_iterator<E2,<
|
||||
<tt class="docutils literal"><span class="pre">X</span></tt> is interoperable with <tt class="docutils literal"><span class="pre">Y</span></tt> and <tt class="docutils literal"><span class="pre">E1</span></tt> is convertible
|
||||
to <tt class="docutils literal"><span class="pre">E2</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a class="toc-backref" href="#id6" id="permutation-iterator-operations" name="permutation-iterator-operations"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> operations</a></h2>
|
||||
<div class="section" id="permutation-iterator-operations">
|
||||
<h2><a class="toc-backref" href="#id6"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> operations</a></h2>
|
||||
<p>In addition to those operations required by the concepts that
|
||||
<tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models, <tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> provides the
|
||||
following operations.</p>
|
||||
@ -514,8 +232,8 @@ make_permutation_iterator(ElementIterator e, IndexIterator i);
|
||||
</table>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id7" id="example" name="example">Example</a></h1>
|
||||
<div class="section" id="example">
|
||||
<h1><a class="toc-backref" href="#id7">Example</a></h1>
|
||||
<!-- Copyright David Abrahams 2006. 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) -->
|
||||
@ -580,8 +298,14 @@ Elements at even indices in the permutation : 9 7
|
||||
Permutation backwards : 6 7 8 9
|
||||
Iterate backward with stride 2 : 6 8
|
||||
</pre>
|
||||
<p>The source code for this example can be found <a class="reference" href="../example/permutation_iter_example.cpp">here</a>.</p>
|
||||
<p>The source code for this example can be found <a class="reference external" href="../example/permutation_iter_example.cpp">here</a>.</p>
|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
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<hr class="footer" />
|
||||
<a class="reference external" href="permutation_iterator.rst">View document source</a>.
|
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Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
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</body>
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</html>
|
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|
0
doc/permutation_iterator.pdf
Executable file → Normal file
0
doc/permutation_iterator.pdf
Executable file → Normal file
326
doc/pointee.html
Executable file → Normal file
326
doc/pointee.html
Executable file → Normal file
@ -3,295 +3,13 @@
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|
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|
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|
||||
</head>
|
||||
<body>
|
||||
<div class="document" id="pointee-and-indirect-reference">
|
||||
@ -303,11 +21,11 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first last reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a></td></tr>
|
||||
<td><a class="first last reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first last reference" href="http://www.boost-consulting.com">Boost Consulting</a></td></tr>
|
||||
<td><a class="first last reference external" href="http://www.boost-consulting.com">Boost Consulting</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2005-02-27</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams 2004.</td></tr>
|
||||
</tbody>
|
||||
@ -324,8 +42,8 @@ pointers, smart pointers and iterators in generic code.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="section">
|
||||
<h1><a id="overview" name="overview">Overview</a></h1>
|
||||
<div class="section" id="overview">
|
||||
<h1>Overview</h1>
|
||||
<p>Have you ever wanted to write a generic function that can operate
|
||||
on any kind of dereferenceable object? If you have, you've
|
||||
probably run into the problem of how to determine the type that the
|
||||
@ -338,8 +56,8 @@ void f(Dereferenceable p)
|
||||
...
|
||||
}
|
||||
</pre>
|
||||
<div class="section">
|
||||
<h2><a id="pointee" name="pointee"><tt class="docutils literal"><span class="pre">pointee</span></tt></a></h2>
|
||||
<div class="section" id="pointee">
|
||||
<h2><tt class="docutils literal"><span class="pre">pointee</span></tt></h2>
|
||||
<p>It turns out to be impossible to come up with a fully-general
|
||||
algorithm to do determine <em>what-goes-here</em> directly, but it is
|
||||
possible to require that <tt class="docutils literal"><span class="pre">pointee<Dereferenceable>::type</span></tt> is
|
||||
@ -360,8 +78,8 @@ namespace boost
|
||||
}
|
||||
</pre>
|
||||
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|
||||
<div class="section">
|
||||
<h2><a id="indirect-reference" name="indirect-reference"><tt class="docutils literal"><span class="pre">indirect_reference</span></tt></a></h2>
|
||||
<div class="section" id="indirect-reference">
|
||||
<h2><tt class="docutils literal"><span class="pre">indirect_reference</span></tt></h2>
|
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<p><tt class="docutils literal"><span class="pre">indirect_reference<T>::type</span></tt> is rather more specialized than
|
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<tt class="docutils literal"><span class="pre">pointee</span></tt>, and is meant to be used to forward the result of
|
||||
dereferencing an object of its argument type. Most dereferenceable
|
||||
@ -369,13 +87,13 @@ types just return a reference to their pointee, but some return
|
||||
proxy references or return the pointee by value. When that
|
||||
information is needed, call on <tt class="docutils literal"><span class="pre">indirect_reference</span></tt>.</p>
|
||||
<p>Both of these templates are essential to the correct functioning of
|
||||
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|
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<a class="reference external" href="indirect_iterator.html"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt></a>.</p>
|
||||
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|
||||
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|
||||
<div class="section">
|
||||
<h1><a id="reference" name="reference">Reference</a></h1>
|
||||
<div class="section">
|
||||
<h2><a id="id1" name="id1"><tt class="docutils literal"><span class="pre">pointee</span></tt></a></h2>
|
||||
<div class="section" id="reference">
|
||||
<h1>Reference</h1>
|
||||
<div class="section" id="id1">
|
||||
<h2><tt class="docutils literal"><span class="pre">pointee</span></tt></h2>
|
||||
<!-- Copyright David Abrahams 2004. Use, modification and distribution is -->
|
||||
<!-- subject to 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) -->
|
||||
@ -418,8 +136,8 @@ else
|
||||
}
|
||||
</pre>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h2><a id="id2" name="id2"><tt class="docutils literal"><span class="pre">indirect_reference</span></tt></a></h2>
|
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<div class="section" id="id2">
|
||||
<h2><tt class="docutils literal"><span class="pre">indirect_reference</span></tt></h2>
|
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<!-- Copyright David Abrahams 2004. Use, modification and distribution is -->
|
||||
<!-- subject to 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) -->
|
||||
@ -454,6 +172,12 @@ else
|
||||
</pre>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="pointee.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
0
doc/pointee.pdf
Executable file → Normal file
0
doc/pointee.pdf
Executable file → Normal file
0
doc/pointee.rst
Executable file → Normal file
0
doc/pointee.rst
Executable file → Normal file
0
doc/pointee_ref.rst
Executable file → Normal file
0
doc/pointee_ref.rst
Executable file → Normal file
@ -7,7 +7,7 @@ example of a linked list of polymorphic objects. This example was
|
||||
inspired by a
|
||||
[@http://thread.gmane.org/gmane.comp.lib.boost.user/5100 `posting`]
|
||||
by Keith Macdonald on the
|
||||
[@../../../more/mailing_lists.htm#users `Boost-Users`]
|
||||
[@http://www.boost.org/more/mailing_lists.htm#users `Boost-Users`]
|
||||
mailing list.
|
||||
|
||||
|
||||
|
@ -32,7 +32,7 @@
|
||||
|
||||
[section:intro Introduction]
|
||||
|
||||
[def _concepts_ [@../../more/generic_programming.html#concept concepts]]
|
||||
[def _concepts_ [@http://www.boost.org/more/generic_programming.html#concept concepts]]
|
||||
|
||||
The Boost Iterator Library contains two parts. The first
|
||||
is a system of _concepts_ which extend the C++ standard
|
||||
@ -203,7 +203,7 @@ templates.
|
||||
|
||||
[section:upgrading Upgrading from the old Boost Iterator Adaptor Library]
|
||||
|
||||
[def _type_generator_ [@../../more/generic_programming.html#type_generator type generator]]
|
||||
[def _type_generator_ [@http://www.boost.org/more/generic_programming.html#type_generator type generator]]
|
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|
||||
If you have been using the old Boost Iterator Adaptor library to
|
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|
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|
@ -3,295 +3,13 @@
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||||
white-space: pre }
|
||||
|
||||
span.problematic {
|
||||
color: red }
|
||||
|
||||
span.section-subtitle {
|
||||
/* font-size relative to parent (h1..h6 element) */
|
||||
font-size: 80% }
|
||||
|
||||
table.citation {
|
||||
border-left: solid 1px gray;
|
||||
margin-left: 1px }
|
||||
|
||||
table.docinfo {
|
||||
margin: 2em 4em }
|
||||
|
||||
table.docutils {
|
||||
margin-top: 0.5em ;
|
||||
margin-bottom: 0.5em }
|
||||
|
||||
table.footnote {
|
||||
border-left: solid 1px black;
|
||||
margin-left: 1px }
|
||||
|
||||
table.docutils td, table.docutils th,
|
||||
table.docinfo td, table.docinfo th {
|
||||
padding-left: 0.5em ;
|
||||
padding-right: 0.5em ;
|
||||
vertical-align: top }
|
||||
|
||||
table.docutils th.field-name, table.docinfo th.docinfo-name {
|
||||
font-weight: bold ;
|
||||
text-align: left ;
|
||||
white-space: nowrap ;
|
||||
padding-left: 0 }
|
||||
|
||||
h1 tt.docutils, h2 tt.docutils, h3 tt.docutils,
|
||||
h4 tt.docutils, h5 tt.docutils, h6 tt.docutils {
|
||||
font-size: 100% }
|
||||
|
||||
tt.docutils {
|
||||
background-color: #eeeeee }
|
||||
|
||||
ul.auto-toc {
|
||||
list-style-type: none }
|
||||
|
||||
</style>
|
||||
<link rel="stylesheet" href="../../../rst.css" type="text/css" />
|
||||
</head>
|
||||
<body>
|
||||
<div class="document" id="reverse-iterator">
|
||||
@ -303,13 +21,13 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams, Jeremy Siek, Thomas Witt</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference external" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference external" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
Railway Operation and Construction</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.</td></tr>
|
||||
</tbody>
|
||||
@ -329,18 +47,18 @@ range in the opposite direction.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first">Table of Contents</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#reverse-iterator-synopsis" id="id2" name="id2"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> synopsis</a></li>
|
||||
<li><a class="reference" href="#reverse-iterator-requirements" id="id3" name="id3"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference" href="#reverse-iterator-models" id="id4" name="id4"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference" href="#reverse-iterator-operations" id="id5" name="id5"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference" href="#example" id="id6" name="id6">Example</a></li>
|
||||
<li><a class="reference internal" href="#reverse-iterator-synopsis" id="id2"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> synopsis</a></li>
|
||||
<li><a class="reference internal" href="#reverse-iterator-requirements" id="id3"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference internal" href="#reverse-iterator-models" id="id4"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference internal" href="#reverse-iterator-operations" id="id5"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference internal" href="#example" id="id6">Example</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id2" id="reverse-iterator-synopsis" name="reverse-iterator-synopsis"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> synopsis</a></h1>
|
||||
<div class="section" id="reverse-iterator-synopsis">
|
||||
<h1><a class="toc-backref" href="#id2"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> synopsis</a></h1>
|
||||
<!-- Copyright David Abrahams 2006. 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) -->
|
||||
@ -379,14 +97,14 @@ Lvalue Iterator, then <tt class="docutils literal"><span class="pre">iterator_ca
|
||||
<tt class="docutils literal"><span class="pre">bidirectional_iterator_tag</span></tt>. Otherwise, <tt class="docutils literal"><span class="pre">iterator_category</span></tt> is
|
||||
convertible to <tt class="docutils literal"><span class="pre">input_iterator_tag</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id3" id="reverse-iterator-requirements" name="reverse-iterator-requirements"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> requirements</a></h1>
|
||||
<div class="section" id="reverse-iterator-requirements">
|
||||
<h1><a class="toc-backref" href="#id3"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> requirements</a></h1>
|
||||
<p><tt class="docutils literal"><span class="pre">Iterator</span></tt> must be a model of Bidirectional Traversal Iterator. The
|
||||
type <tt class="docutils literal"><span class="pre">iterator_traits<Iterator>::reference</span></tt> must be the type of
|
||||
<tt class="docutils literal"><span class="pre">*i</span></tt>, where <tt class="docutils literal"><span class="pre">i</span></tt> is an object of type <tt class="docutils literal"><span class="pre">Iterator</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id4" id="reverse-iterator-models" name="reverse-iterator-models"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> models</a></h1>
|
||||
<div class="section" id="reverse-iterator-models">
|
||||
<h1><a class="toc-backref" href="#id4"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> models</a></h1>
|
||||
<p>A specialization of <tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> models the same iterator
|
||||
traversal and iterator access concepts modeled by its <tt class="docutils literal"><span class="pre">Iterator</span></tt>
|
||||
argument. In addition, it may model old iterator concepts
|
||||
@ -424,8 +142,8 @@ Random Access Traversal Iterator</td>
|
||||
<tt class="docutils literal"><span class="pre">reverse_iterator<Y></span></tt> if and only if <tt class="docutils literal"><span class="pre">X</span></tt> is interoperable with
|
||||
<tt class="docutils literal"><span class="pre">Y</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id5" id="reverse-iterator-operations" name="reverse-iterator-operations"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> operations</a></h1>
|
||||
<div class="section" id="reverse-iterator-operations">
|
||||
<h1><a class="toc-backref" href="#id5"><tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> operations</a></h1>
|
||||
<p>In addition to the operations required by the concepts modeled by
|
||||
<tt class="docutils literal"><span class="pre">reverse_iterator</span></tt>, <tt class="docutils literal"><span class="pre">reverse_iterator</span></tt> provides the following
|
||||
operations.</p>
|
||||
@ -534,8 +252,8 @@ with a <tt class="docutils literal"><span class="pre">current</span></tt> constr
|
||||
<!-- Software License, Version 1.0. (See accompanying -->
|
||||
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id6" id="example" name="example">Example</a></h1>
|
||||
<div class="section" id="example">
|
||||
<h1><a class="toc-backref" href="#id6">Example</a></h1>
|
||||
<p>The following example prints an array of characters in reverse order
|
||||
using <tt class="docutils literal"><span class="pre">reverse_iterator</span></tt>.</p>
|
||||
<pre class="literal-block">
|
||||
@ -566,8 +284,14 @@ original sequence of letters: hello world!
|
||||
sequence in reverse order: !dlrow olleh
|
||||
sequence in double-reversed (normal) order: hello world!
|
||||
</pre>
|
||||
<p>The source code for this example can be found <a class="reference" href="../example/reverse_iterator_example.cpp">here</a>.</p>
|
||||
<p>The source code for this example can be found <a class="reference external" href="../example/reverse_iterator_example.cpp">here</a>.</p>
|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="reverse_iterator.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
0
doc/reverse_iterator.pdf
Executable file → Normal file
0
doc/reverse_iterator.pdf
Executable file → Normal file
@ -4,7 +4,7 @@
|
||||
# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
PYTHONPATH="c:/src/docutils;c:/src/docutils/extras"
|
||||
export PYTHONPATH
|
||||
python rst2html.py -gs $1 `echo $1 | sed 's/\(.*\)\..*/\1.html/'`
|
||||
rst2html.py -gs --link-stylesheet --traceback --trim-footnote-reference-space --footnote-references=superscript --stylesheet=../../../rst.css $1 `echo $1 | sed 's/\(.*\)\..*/\1.html/'`
|
||||
|
||||
|
||||
|
||||
|
@ -6,6 +6,7 @@ sources = [
|
||||
'counting_iterator.rst',
|
||||
'facade-and-adaptor.rst',
|
||||
'filter_iterator.rst',
|
||||
'function_input_iterator.rst',
|
||||
'function_output_iterator.rst',
|
||||
'index.rst',
|
||||
'indirect_iterator.rst',
|
||||
|
@ -3,295 +3,13 @@
|
||||
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
||||
<meta name="generator" content="Docutils 0.4: http://docutils.sourceforge.net/" />
|
||||
<meta name="generator" content="Docutils 0.5: http://docutils.sourceforge.net/" />
|
||||
<title>Transform Iterator</title>
|
||||
<meta name="author" content="David Abrahams, Jeremy Siek, Thomas Witt" />
|
||||
<meta name="organization" content="Boost Consulting, Indiana University Open Systems Lab, University of Hanover Institute for Transport Railway Operation and Construction" />
|
||||
<meta name="date" content="2004-11-01" />
|
||||
<meta name="date" content="2006-09-11" />
|
||||
<meta name="copyright" content="Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003." />
|
||||
<style type="text/css">
|
||||
|
||||
/*
|
||||
:Author: David Goodger
|
||||
:Contact: goodger@users.sourceforge.net
|
||||
:Date: $Date$
|
||||
:Revision: $Revision$
|
||||
:Copyright: This stylesheet has been placed in the public domain.
|
||||
|
||||
Default cascading style sheet for the HTML output of Docutils.
|
||||
|
||||
See http://docutils.sf.net/docs/howto/html-stylesheets.html for how to
|
||||
customize this style sheet.
|
||||
*/
|
||||
|
||||
/* used to remove borders from tables and images */
|
||||
.borderless, table.borderless td, table.borderless th {
|
||||
border: 0 }
|
||||
|
||||
table.borderless td, table.borderless th {
|
||||
/* Override padding for "table.docutils td" with "! important".
|
||||
The right padding separates the table cells. */
|
||||
padding: 0 0.5em 0 0 ! important }
|
||||
|
||||
.first {
|
||||
/* Override more specific margin styles with "! important". */
|
||||
margin-top: 0 ! important }
|
||||
|
||||
.last, .with-subtitle {
|
||||
margin-bottom: 0 ! important }
|
||||
|
||||
.hidden {
|
||||
display: none }
|
||||
|
||||
a.toc-backref {
|
||||
text-decoration: none ;
|
||||
color: black }
|
||||
|
||||
blockquote.epigraph {
|
||||
margin: 2em 5em ; }
|
||||
|
||||
dl.docutils dd {
|
||||
margin-bottom: 0.5em }
|
||||
|
||||
/* Uncomment (and remove this text!) to get bold-faced definition list terms
|
||||
dl.docutils dt {
|
||||
font-weight: bold }
|
||||
*/
|
||||
|
||||
div.abstract {
|
||||
margin: 2em 5em }
|
||||
|
||||
div.abstract p.topic-title {
|
||||
font-weight: bold ;
|
||||
text-align: center }
|
||||
|
||||
div.admonition, div.attention, div.caution, div.danger, div.error,
|
||||
div.hint, div.important, div.note, div.tip, div.warning {
|
||||
margin: 2em ;
|
||||
border: medium outset ;
|
||||
padding: 1em }
|
||||
|
||||
div.admonition p.admonition-title, div.hint p.admonition-title,
|
||||
div.important p.admonition-title, div.note p.admonition-title,
|
||||
div.tip p.admonition-title {
|
||||
font-weight: bold ;
|
||||
font-family: sans-serif }
|
||||
|
||||
div.attention p.admonition-title, div.caution p.admonition-title,
|
||||
div.danger p.admonition-title, div.error p.admonition-title,
|
||||
div.warning p.admonition-title {
|
||||
color: red ;
|
||||
font-weight: bold ;
|
||||
font-family: sans-serif }
|
||||
|
||||
/* Uncomment (and remove this text!) to get reduced vertical space in
|
||||
compound paragraphs.
|
||||
div.compound .compound-first, div.compound .compound-middle {
|
||||
margin-bottom: 0.5em }
|
||||
|
||||
div.compound .compound-last, div.compound .compound-middle {
|
||||
margin-top: 0.5em }
|
||||
*/
|
||||
|
||||
div.dedication {
|
||||
margin: 2em 5em ;
|
||||
text-align: center ;
|
||||
font-style: italic }
|
||||
|
||||
div.dedication p.topic-title {
|
||||
font-weight: bold ;
|
||||
font-style: normal }
|
||||
|
||||
div.figure {
|
||||
margin-left: 2em ;
|
||||
margin-right: 2em }
|
||||
|
||||
div.footer, div.header {
|
||||
clear: both;
|
||||
font-size: smaller }
|
||||
|
||||
div.line-block {
|
||||
display: block ;
|
||||
margin-top: 1em ;
|
||||
margin-bottom: 1em }
|
||||
|
||||
div.line-block div.line-block {
|
||||
margin-top: 0 ;
|
||||
margin-bottom: 0 ;
|
||||
margin-left: 1.5em }
|
||||
|
||||
div.sidebar {
|
||||
margin-left: 1em ;
|
||||
border: medium outset ;
|
||||
padding: 1em ;
|
||||
background-color: #ffffee ;
|
||||
width: 40% ;
|
||||
float: right ;
|
||||
clear: right }
|
||||
|
||||
div.sidebar p.rubric {
|
||||
font-family: sans-serif ;
|
||||
font-size: medium }
|
||||
|
||||
div.system-messages {
|
||||
margin: 5em }
|
||||
|
||||
div.system-messages h1 {
|
||||
color: red }
|
||||
|
||||
div.system-message {
|
||||
border: medium outset ;
|
||||
padding: 1em }
|
||||
|
||||
div.system-message p.system-message-title {
|
||||
color: red ;
|
||||
font-weight: bold }
|
||||
|
||||
div.topic {
|
||||
margin: 2em }
|
||||
|
||||
h1.section-subtitle, h2.section-subtitle, h3.section-subtitle,
|
||||
h4.section-subtitle, h5.section-subtitle, h6.section-subtitle {
|
||||
margin-top: 0.4em }
|
||||
|
||||
h1.title {
|
||||
text-align: center }
|
||||
|
||||
h2.subtitle {
|
||||
text-align: center }
|
||||
|
||||
hr.docutils {
|
||||
width: 75% }
|
||||
|
||||
img.align-left {
|
||||
clear: left }
|
||||
|
||||
img.align-right {
|
||||
clear: right }
|
||||
|
||||
ol.simple, ul.simple {
|
||||
margin-bottom: 1em }
|
||||
|
||||
ol.arabic {
|
||||
list-style: decimal }
|
||||
|
||||
ol.loweralpha {
|
||||
list-style: lower-alpha }
|
||||
|
||||
ol.upperalpha {
|
||||
list-style: upper-alpha }
|
||||
|
||||
ol.lowerroman {
|
||||
list-style: lower-roman }
|
||||
|
||||
ol.upperroman {
|
||||
list-style: upper-roman }
|
||||
|
||||
p.attribution {
|
||||
text-align: right ;
|
||||
margin-left: 50% }
|
||||
|
||||
p.caption {
|
||||
font-style: italic }
|
||||
|
||||
p.credits {
|
||||
font-style: italic ;
|
||||
font-size: smaller }
|
||||
|
||||
p.label {
|
||||
white-space: nowrap }
|
||||
|
||||
p.rubric {
|
||||
font-weight: bold ;
|
||||
font-size: larger ;
|
||||
color: maroon ;
|
||||
text-align: center }
|
||||
|
||||
p.sidebar-title {
|
||||
font-family: sans-serif ;
|
||||
font-weight: bold ;
|
||||
font-size: larger }
|
||||
|
||||
p.sidebar-subtitle {
|
||||
font-family: sans-serif ;
|
||||
font-weight: bold }
|
||||
|
||||
p.topic-title {
|
||||
font-weight: bold }
|
||||
|
||||
pre.address {
|
||||
margin-bottom: 0 ;
|
||||
margin-top: 0 ;
|
||||
font-family: serif ;
|
||||
font-size: 100% }
|
||||
|
||||
pre.literal-block, pre.doctest-block {
|
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|
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|
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|
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|
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|
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h1 tt.docutils, h2 tt.docutils, h3 tt.docutils,
|
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h4 tt.docutils, h5 tt.docutils, h6 tt.docutils {
|
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|
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|
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|
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|
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|
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list-style-type: none }
|
||||
|
||||
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|
||||
<link rel="stylesheet" href="../../../rst.css" type="text/css" />
|
||||
</head>
|
||||
<body>
|
||||
<div class="document" id="transform-iterator">
|
||||
@ -303,13 +21,13 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams, Jeremy Siek, Thomas Witt</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference external" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
|
||||
Lab</a>, University of Hanover <a class="last reference external" href="http://www.ive.uni-hannover.de">Institute for Transport
|
||||
Railway Operation and Construction</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.</td></tr>
|
||||
</tbody>
|
||||
@ -330,18 +48,18 @@ dereferencing the iterator and returning the result.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first">Table of Contents</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#transform-iterator-synopsis" id="id2" name="id2"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> synopsis</a></li>
|
||||
<li><a class="reference" href="#transform-iterator-requirements" id="id3" name="id3"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference" href="#transform-iterator-models" id="id4" name="id4"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference" href="#transform-iterator-operations" id="id5" name="id5"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference" href="#example" id="id6" name="id6">Example</a></li>
|
||||
<li><a class="reference internal" href="#transform-iterator-synopsis" id="id2"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> synopsis</a></li>
|
||||
<li><a class="reference internal" href="#transform-iterator-requirements" id="id3"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference internal" href="#transform-iterator-models" id="id4"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference internal" href="#transform-iterator-operations" id="id5"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference internal" href="#example" id="id6">Example</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id2" id="transform-iterator-synopsis" name="transform-iterator-synopsis"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> synopsis</a></h1>
|
||||
<div class="section" id="transform-iterator-synopsis">
|
||||
<h1><a class="toc-backref" href="#id2"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> synopsis</a></h1>
|
||||
<!-- Copyright David Abrahams 2006. 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) -->
|
||||
@ -381,7 +99,7 @@ private:
|
||||
</pre>
|
||||
<p>If <tt class="docutils literal"><span class="pre">Reference</span></tt> is <tt class="docutils literal"><span class="pre">use_default</span></tt> then the <tt class="docutils literal"><span class="pre">reference</span></tt> member of
|
||||
<tt class="docutils literal"><span class="pre">transform_iterator</span></tt> is
|
||||
<tt class="docutils literal"><span class="pre">result_of<UnaryFunction(iterator_traits<Iterator>::reference)>::type</span></tt>.
|
||||
<tt class="docutils literal"><span class="pre">result_of<const UnaryFunction(iterator_traits<Iterator>::reference)>::type</span></tt>.
|
||||
Otherwise, <tt class="docutils literal"><span class="pre">reference</span></tt> is <tt class="docutils literal"><span class="pre">Reference</span></tt>.</p>
|
||||
<p>If <tt class="docutils literal"><span class="pre">Value</span></tt> is <tt class="docutils literal"><span class="pre">use_default</span></tt> then the <tt class="docutils literal"><span class="pre">value_type</span></tt> member is
|
||||
<tt class="docutils literal"><span class="pre">remove_cv<remove_reference<reference></span> <span class="pre">>::type</span></tt>. Otherwise,
|
||||
@ -396,17 +114,17 @@ convertible to <tt class="docutils literal"><span class="pre">forward_iterator_t
|
||||
model Readable Lvalue Iterator then <tt class="docutils literal"><span class="pre">iterator_category</span></tt> is
|
||||
convertible to <tt class="docutils literal"><span class="pre">input_iterator_tag</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id3" id="transform-iterator-requirements" name="transform-iterator-requirements"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> requirements</a></h1>
|
||||
<div class="section" id="transform-iterator-requirements">
|
||||
<h1><a class="toc-backref" href="#id3"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> requirements</a></h1>
|
||||
<p>The type <tt class="docutils literal"><span class="pre">UnaryFunction</span></tt> must be Assignable, Copy Constructible, and
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id4" id="transform-iterator-models" name="transform-iterator-models"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> models</a></h1>
|
||||
<div class="section" id="transform-iterator-models">
|
||||
<h1><a class="toc-backref" href="#id4"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> models</a></h1>
|
||||
<p>The resulting <tt class="docutils literal"><span class="pre">transform_iterator</span></tt> models the most refined of the
|
||||
following that is also modeled by <tt class="docutils literal"><span class="pre">Iterator</span></tt>.</p>
|
||||
<blockquote>
|
||||
@ -452,8 +170,8 @@ mutable iterator (as defined in the old iterator requirements).</p>
|
||||
<tt class="docutils literal"><span class="pre">transform_iterator<F2,</span> <span class="pre">Y,</span> <span class="pre">R2,</span> <span class="pre">V2></span></tt> if and only if <tt class="docutils literal"><span class="pre">X</span></tt> is
|
||||
interoperable with <tt class="docutils literal"><span class="pre">Y</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id5" id="transform-iterator-operations" name="transform-iterator-operations"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> operations</a></h1>
|
||||
<div class="section" id="transform-iterator-operations">
|
||||
<h1><a class="toc-backref" href="#id5"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> operations</a></h1>
|
||||
<p>In addition to the operations required by the concepts modeled by
|
||||
<tt class="docutils literal"><span class="pre">transform_iterator</span></tt>, <tt class="docutils literal"><span class="pre">transform_iterator</span></tt> provides the following
|
||||
operations.</p>
|
||||
@ -581,8 +299,8 @@ default constructed and <tt class="docutils literal"><span class="pre">m_iterato
|
||||
<!-- Software License, Version 1.0. (See accompanying -->
|
||||
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id6" id="example" name="example">Example</a></h1>
|
||||
<div class="section" id="example">
|
||||
<h1><a class="toc-backref" href="#id6">Example</a></h1>
|
||||
<p>This is a simple example of using the transform_iterators class to
|
||||
generate iterators that multiply (or add to) the value returned by
|
||||
dereferencing the iterator. It would be cooler to use lambda library
|
||||
@ -615,8 +333,14 @@ multiplying the array by 2:
|
||||
adding 4 to each element in the array:
|
||||
5 6 7 8 9 10 11 12
|
||||
</pre>
|
||||
<p>The source code for this example can be found <a class="reference" href="../example/transform_iterator_example.cpp">here</a>.</p>
|
||||
<p>The source code for this example can be found <a class="reference external" href="../example/transform_iterator_example.cpp">here</a>.</p>
|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="transform_iterator.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
0
doc/transform_iterator.pdf
Executable file → Normal file
0
doc/transform_iterator.pdf
Executable file → Normal file
0
doc/transform_iterator_eg.rst
Executable file → Normal file
0
doc/transform_iterator_eg.rst
Executable file → Normal file
@ -41,7 +41,7 @@
|
||||
|
||||
If ``Reference`` is ``use_default`` then the ``reference`` member of
|
||||
``transform_iterator`` is
|
||||
``result_of<UnaryFunction(iterator_traits<Iterator>::reference)>::type``.
|
||||
``result_of<const UnaryFunction(iterator_traits<Iterator>::reference)>::type``.
|
||||
Otherwise, ``reference`` is ``Reference``.
|
||||
|
||||
If ``Value`` is ``use_default`` then the ``value_type`` member is
|
||||
@ -64,10 +64,10 @@ convertible to ``input_iterator_tag``.
|
||||
...................................
|
||||
|
||||
The type ``UnaryFunction`` must be Assignable, Copy Constructible, and
|
||||
the expression ``f(*i)`` must be valid where ``f`` is an object of
|
||||
the expression ``f(*i)`` must be valid where ``f`` is a const object of
|
||||
type ``UnaryFunction``, ``i`` is an object of type ``Iterator``, and
|
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where the type of ``f(*i)`` must be
|
||||
``result_of<UnaryFunction(iterator_traits<Iterator>::reference)>::type``.
|
||||
``result_of<const UnaryFunction(iterator_traits<Iterator>::reference)>::type``.
|
||||
|
||||
The argument ``Iterator`` shall model Readable Iterator.
|
||||
|
||||
|
334
doc/zip_iterator.html
Executable file → Normal file
334
doc/zip_iterator.html
Executable file → Normal file
@ -3,295 +3,13 @@
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|
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|
||||
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|
||||
|
||||
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|
||||
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|
||||
|
||||
h1.section-subtitle, h2.section-subtitle, h3.section-subtitle,
|
||||
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|
||||
margin-top: 0.4em }
|
||||
|
||||
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|
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|
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|
||||
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|
||||
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|
||||
|
||||
hr.docutils {
|
||||
width: 75% }
|
||||
|
||||
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|
||||
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|
||||
|
||||
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|
||||
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|
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|
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|
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|
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|
||||
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|
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|
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|
||||
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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font-weight: bold }
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
||||
|
||||
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|
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|
||||
table.docutils td, table.docutils th,
|
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padding-left: 0 }
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|
||||
h1 tt.docutils, h2 tt.docutils, h3 tt.docutils,
|
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h4 tt.docutils, h5 tt.docutils, h6 tt.docutils {
|
||||
font-size: 100% }
|
||||
|
||||
tt.docutils {
|
||||
background-color: #eeeeee }
|
||||
|
||||
ul.auto-toc {
|
||||
list-style-type: none }
|
||||
|
||||
</style>
|
||||
<link rel="stylesheet" href="../../../rst.css" type="text/css" />
|
||||
</head>
|
||||
<body>
|
||||
<div class="document" id="zip-iterator">
|
||||
@ -303,11 +21,11 @@ ul.auto-toc {
|
||||
<tr><th class="docinfo-name">Author:</th>
|
||||
<td>David Abrahams, Thomas Becker</td></tr>
|
||||
<tr><th class="docinfo-name">Contact:</th>
|
||||
<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="last reference" href="mailto:thomas@styleadvisor.com">thomas@styleadvisor.com</a></td></tr>
|
||||
<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="last reference external" href="mailto:thomas@styleadvisor.com">thomas@styleadvisor.com</a></td></tr>
|
||||
<tr><th class="docinfo-name">Organization:</th>
|
||||
<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, <a class="last reference" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr>
|
||||
<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, <a class="last reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr>
|
||||
<tr><th class="docinfo-name">Date:</th>
|
||||
<td>2004-11-01</td></tr>
|
||||
<td>2006-09-11</td></tr>
|
||||
<tr><th class="docinfo-name">Copyright:</th>
|
||||
<td>Copyright David Abrahams and Thomas Becker 2003.</td></tr>
|
||||
</tbody>
|
||||
@ -331,18 +49,18 @@ the results of dereferencing the individual iterators.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<div class="contents topic">
|
||||
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
|
||||
<div class="contents topic" id="table-of-contents">
|
||||
<p class="topic-title first">Table of Contents</p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#zip-iterator-synopsis" id="id1" name="id1"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> synopsis</a></li>
|
||||
<li><a class="reference" href="#zip-iterator-requirements" id="id2" name="id2"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference" href="#zip-iterator-models" id="id3" name="id3"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference" href="#zip-iterator-operations" id="id4" name="id4"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference" href="#examples" id="id5" name="id5">Examples</a></li>
|
||||
<li><a class="reference internal" href="#zip-iterator-synopsis" id="id1"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> synopsis</a></li>
|
||||
<li><a class="reference internal" href="#zip-iterator-requirements" id="id2"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> requirements</a></li>
|
||||
<li><a class="reference internal" href="#zip-iterator-models" id="id3"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> models</a></li>
|
||||
<li><a class="reference internal" href="#zip-iterator-operations" id="id4"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> operations</a></li>
|
||||
<li><a class="reference internal" href="#examples" id="id5">Examples</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id1" id="zip-iterator-synopsis" name="zip-iterator-synopsis"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> synopsis</a></h1>
|
||||
<div class="section" id="zip-iterator-synopsis">
|
||||
<h1><a class="toc-backref" href="#id1"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> synopsis</a></h1>
|
||||
<!-- Copyright David Abrahams 2006. 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) -->
|
||||
@ -392,12 +110,12 @@ iterators, then <tt class="docutils literal"><span class="pre">iterator_category
|
||||
<tt class="docutils literal"><span class="pre">iterator_category</span></tt> will be convertible to <tt class="docutils literal"><span class="pre">boost::bidirectional_traversal_tag</span></tt>,
|
||||
but no longer to <tt class="docutils literal"><span class="pre">boost::random_access_traversal_tag</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id2" id="zip-iterator-requirements" name="zip-iterator-requirements"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> requirements</a></h1>
|
||||
<div class="section" id="zip-iterator-requirements">
|
||||
<h1><a class="toc-backref" href="#id2"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> requirements</a></h1>
|
||||
<p>All iterator types in the argument <tt class="docutils literal"><span class="pre">IteratorTuple</span></tt> shall model Readable Iterator.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id3" id="zip-iterator-models" name="zip-iterator-models"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> models</a></h1>
|
||||
<div class="section" id="zip-iterator-models">
|
||||
<h1><a class="toc-backref" href="#id3"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> models</a></h1>
|
||||
<p>The resulting <tt class="docutils literal"><span class="pre">zip_iterator</span></tt> models Readable Iterator.</p>
|
||||
<p>The fact that the <tt class="docutils literal"><span class="pre">zip_iterator</span></tt> models only Readable Iterator does not
|
||||
prevent you from modifying the values that the individual iterators point
|
||||
@ -418,8 +136,8 @@ models the least refined standard traversal concept in this set.</p>
|
||||
<tt class="docutils literal"><span class="pre">zip_iterator<IteratorTuple2></span></tt> if and only if <tt class="docutils literal"><span class="pre">IteratorTuple1</span></tt>
|
||||
is interoperable with <tt class="docutils literal"><span class="pre">IteratorTuple2</span></tt>.</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id4" id="zip-iterator-operations" name="zip-iterator-operations"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> operations</a></h1>
|
||||
<div class="section" id="zip-iterator-operations">
|
||||
<h1><a class="toc-backref" href="#id4"><tt class="docutils literal"><span class="pre">zip_iterator</span></tt> operations</a></h1>
|
||||
<p>In addition to the operations required by the concepts modeled by
|
||||
<tt class="docutils literal"><span class="pre">zip_iterator</span></tt>, <tt class="docutils literal"><span class="pre">zip_iterator</span></tt> provides the following
|
||||
operations.</p>
|
||||
@ -538,8 +256,8 @@ initialized to <tt class="docutils literal"><span class="pre">t</span></tt>.</td
|
||||
<!-- Software License, Version 1.0. (See accompanying -->
|
||||
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
|
||||
</div>
|
||||
<div class="section">
|
||||
<h1><a class="toc-backref" href="#id5" id="examples" name="examples">Examples</a></h1>
|
||||
<div class="section" id="examples">
|
||||
<h1><a class="toc-backref" href="#id5">Examples</a></h1>
|
||||
<p>There are two main types of applications of the <tt class="docutils literal"><span class="pre">zip_iterator</span></tt>. The first
|
||||
one concerns runtime efficiency: If one has several controlled sequences
|
||||
of the same length that must be somehow processed, e.g., with the
|
||||
@ -638,6 +356,12 @@ the_transform_iterator it_end(
|
||||
);
|
||||
</pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="footer">
|
||||
<hr class="footer" />
|
||||
<a class="reference external" href="zip_iterator.rst">View document source</a>.
|
||||
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
0
doc/zip_iterator.pdf
Executable file → Normal file
0
doc/zip_iterator.pdf
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0
doc/zip_iterator.rst
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0
doc/zip_iterator.rst
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0
doc/zip_iterator_abstract.rst
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0
doc/zip_iterator_abstract.rst
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0
doc/zip_iterator_eg.rst
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0
doc/zip_iterator_eg.rst
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0
doc/zip_iterator_ref.rst
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0
doc/zip_iterator_ref.rst
Executable file → Normal file
@ -1,17 +0,0 @@
|
||||
# Copyright David Abrahams 2006. 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)
|
||||
|
||||
test-suite iterator_examples
|
||||
: [ run reverse_iterator.cpp ]
|
||||
[ run node_iterator1.cpp ]
|
||||
[ run node_iterator2.cpp ]
|
||||
[ run node_iterator3.cpp ]
|
||||
[ run counting_iterator_example.cpp ]
|
||||
[ run filter_iterator_example.cpp ]
|
||||
[ run func_output_iter_example.cpp ]
|
||||
[ run indirect_iterator_example.cpp ]
|
||||
[ run permutation_iter_example.cpp ]
|
||||
[ run reverse_iterator_example.cpp ]
|
||||
[ run transform_iterator_example.cpp ]
|
||||
;
|
0
example/node.hpp
Executable file → Normal file
0
example/node.hpp
Executable file → Normal file
0
example/node_iterator1.cpp
Executable file → Normal file
0
example/node_iterator1.cpp
Executable file → Normal file
0
example/node_iterator1.hpp
Executable file → Normal file
0
example/node_iterator1.hpp
Executable file → Normal file
0
example/node_iterator2.cpp
Executable file → Normal file
0
example/node_iterator2.cpp
Executable file → Normal file
0
example/node_iterator2.hpp
Executable file → Normal file
0
example/node_iterator2.hpp
Executable file → Normal file
0
example/node_iterator3.cpp
Executable file → Normal file
0
example/node_iterator3.cpp
Executable file → Normal file
0
example/node_iterator3.hpp
Executable file → Normal file
0
example/node_iterator3.hpp
Executable file → Normal file
@ -1,4 +1,4 @@
|
||||
// interator.hpp workarounds for non-conforming standard libraries ---------//
|
||||
// iterator.hpp workarounds for non-conforming standard libraries ---------//
|
||||
|
||||
// (C) Copyright Beman Dawes 2000. Distributed under the Boost
|
||||
// Software License, Version 1.0. (See accompanying file
|
||||
|
0
include/boost/iterator/detail/any_conversion_eater.hpp
Executable file → Normal file
0
include/boost/iterator/detail/any_conversion_eater.hpp
Executable file → Normal file
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