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< title > Iterator Adaptor</ 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" />
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< meta name = "date" content = "2003-09-14" />
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< meta name = "copyright" content = "Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. All rights reserved" />
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</ head >
< body >
< div class = "document" id = "iterator-adaptor" >
< h1 class = "title" > Iterator Adaptor</ 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, 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 >
< 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
Railway Operation and Construction</ a ></ td ></ tr >
< tr >< th class = "docinfo-name" > Date:</ th >
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< td > 2003-09-14</ td ></ tr >
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< tr >< th class = "docinfo-name" > Copyright:</ th >
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< td > Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. All rights reserved</ td ></ tr >
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</ tbody >
</ table >
< table class = "field-list" frame = "void" rules = "none" >
< col class = "field-name" />
< col class = "field-body" />
< tbody valign = "top" >
< tr class = "field" >< th class = "field-name" > abstract:</ th >< td class = "field-body" ></ td >
</ tr >
</ tbody >
</ table >
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<!-- Version 1.1 of this ReStructuredText document corresponds to
n1530_, the paper accepted by the LWG. -->
<!-- Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. All
rights reserved -->
< p > Each specialization of the < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > class template is derived from
a specialization of < tt class = "literal" >< span class = "pre" > iterator_facade</ span ></ tt > . The core interface functions
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expected by < tt class = "literal" >< span class = "pre" > iterator_facade</ span ></ tt > are implemented in terms of the
< tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > 's < tt class = "literal" >< span class = "pre" > Base</ span ></ tt > template parameter. A class derived
from < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > typically redefines some of the core
interface functions to adapt the behavior of the < tt class = "literal" >< span class = "pre" > Base</ span ></ tt > type.
Whether the derived class models any of the standard iterator concepts
depends on the operations supported by the < tt class = "literal" >< span class = "pre" > Base</ span ></ tt > type and which
core interface functions of < tt class = "literal" >< span class = "pre" > iterator_facade</ span ></ tt > are redefined in the
< tt class = "literal" >< span class = "pre" > Derived</ span ></ tt > class.</ p >
< div class = "contents topic" id = "table-of-contents" >
< p class = "topic-title" >< a name = "table-of-contents" > Table of Contents</ a ></ p >
< ul class = "simple" >
< li >< a class = "reference" href = "#introduction" id = "id3" name = "id3" > Introduction</ a ></ li >
< li >< a class = "reference" href = "#reference" id = "id4" name = "id4" > Reference</ a >< ul >
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< li >< a class = "reference" href = "#iterator-adaptor-base-class-parameters" id = "id5" name = "id5" >< tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > base class parameters</ a ></ li >
< li >< a class = "reference" href = "#iterator-adaptor-usage" id = "id6" name = "id6" >< tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > usage</ a ></ li >
< li >< a class = "reference" href = "#iterator-adaptor-public-operations" id = "id7" name = "id7" >< tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > public operations</ a ></ li >
< li >< a class = "reference" href = "#iterator-adaptor-protected-member-functions" id = "id8" name = "id8" >< tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > protected member functions</ a ></ li >
< li >< a class = "reference" href = "#iterator-adaptor-private-member-functions" id = "id9" name = "id9" >< tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > private member functions</ a ></ li >
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</ ul >
</ li >
</ ul >
</ div >
< div class = "section" id = "introduction" >
< h1 >< a class = "toc-backref" href = "#id3" name = "introduction" > Introduction</ a ></ h1 >
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<!-- 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. All
rights reserved -->
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< p > The < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > class template adapts some < tt class = "literal" >< span class = "pre" > Base</ span ></ tt > < a class = "footnote-reference" href = "#base" id = "id1" name = "id1" >< sup > 1</ sup ></ a >
type to create a new iterator. Instantiations of < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt >
are derived from a corresponding instantiation of < tt class = "literal" >< span class = "pre" > iterator_facade</ span ></ tt >
and implement the core behaviors in terms of the < tt class = "literal" >< span class = "pre" > Base</ span ></ tt > type. In
essence, < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > merely forwards all operations to an
instance of the < tt class = "literal" >< span class = "pre" > Base</ span ></ tt > type, which it stores as a member.</ p >
< table class = "footnote" frame = "void" id = "base" rules = "none" >
< colgroup >< col class = "label" />< col /></ colgroup >
< tbody valign = "top" >
< tr >< td class = "label" >< a class = "fn-backref" href = "#id1" name = "base" > [1]</ a ></ td >< td > 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 = "literal" >< span class = "pre" > reverse_iterator</ span ></ tt > adaptor.</ td ></ tr >
</ tbody >
</ table >
< p > The user of < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > creates a class derived from an
instantiation of < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > and then selectively
redefines some of the core member functions described in the table
above. The < tt class = "literal" >< span class = "pre" > Base</ span ></ tt > type need not meet the full requirements for an
iterator. It need only support the operations used by the core
interface functions of < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > that have not been
redefined in the user's derived class.</ p >
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< p > Several of the template parameters of < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > default
to < tt class = "literal" >< span class = "pre" > use_default</ span ></ tt > . This allows the
user to make use of a default parameter even when she wants to
specify a parameter later in the parameter list. Also, the
defaults for the corresponding associated types are somewhat
complicated, so metaprogramming is required to compute them, and
< tt class = "literal" >< span class = "pre" > use_default</ span ></ tt > can help to simplify the implementation. Finally,
the identity of the < tt class = "literal" >< span class = "pre" > use_default</ span ></ tt > type is not left unspecified
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because specification helps to highlight that the < tt class = "literal" >< span class = "pre" > Reference</ span ></ tt >
template parameter may not always be identical to the iterator's
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< tt class = "literal" >< span class = "pre" > reference</ span ></ tt > type, and will keep users from making mistakes based on
that assumption.</ p >
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</ div >
< div class = "section" id = "reference" >
< h1 >< a class = "toc-backref" href = "#id4" name = "reference" > Reference</ a ></ h1 >
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<!-- Version 1.4 of this ReStructuredText document corresponds to
n1530_, the paper accepted by the LWG for TR1. -->
<!-- Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. All
rights reserved. -->
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< pre class = "literal-block" >
template <
class Derived
, class Base
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, class Value = use_default
, class CategoryOrTraversal = use_default
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, class Reference = use_default
, class Difference = use_default
>
class iterator_adaptor
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: 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 >
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{
friend class iterator_core_access;
public:
iterator_adaptor();
explicit iterator_adaptor(Base iter);
Base base() const;
protected:
Base const& base_reference() const;
Base& base_reference();
private: // Core iterator interface for iterator_facade.
typename iterator_adaptor::reference dereference() const;
template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D
>
bool equal(iterator_adaptor< OtherDerived, OtherIterator, V, C, R, D> const& x) const;
void advance(typename iterator_adaptor::difference_type n);
void increment();
void decrement();
template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D
>
typename iterator_adaptor::difference_type distance_to(
iterator_adaptor< OtherDerived, OtherIterator, V, C, R, D> const& y) const;
private:
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Base m_iterator; // exposition only
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};
</ pre >
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< a class = "target" id = "base-parameters" name = "base-parameters" ></ a >< div class = "section" id = "iterator-adaptor-base-class-parameters" >
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< h2 >< a class = "toc-backref" href = "#id5" name = "iterator-adaptor-base-class-parameters" >< tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > base class parameters</ a ></ h2 >
< p > The < em > V</ em > , < em > C</ em > , < em > R</ em > , and < em > D</ em > parameters of the < tt class = "literal" >< span class = "pre" > iterator_facade</ span ></ tt >
used as a base class in the summary of < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt >
above are defined as follows:</ p >
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< pre class = "literal-block" >
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< em > V</ em > = if (Value is use_default)
return iterator_traits< Base> ::value_type
else
return Value
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< em > C</ em > = if (CategoryOrTraversal is use_default)
return iterator_traversal< Base> ::type
else
return CategoryOrTraversal
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< em > R</ em > = if (Reference is use_default)
if (Value is use_default)
return iterator_traits< Base> ::reference
else
return Value&
else
return Reference
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< em > D</ em > = if (Difference is use_default)
return iterator_traits< Base> ::difference_type
else
return Difference
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</ pre >
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</ div >
< div class = "section" id = "iterator-adaptor-usage" >
< h2 >< a class = "toc-backref" href = "#id6" name = "iterator-adaptor-usage" >< tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > usage</ a ></ h2 >
< p > The < tt class = "literal" >< span class = "pre" > Derived</ span ></ tt > template parameter must be a publicly derived from
< tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > . In order for < tt class = "literal" >< span class = "pre" > Derived</ span ></ tt > to model the
iterator concepts corresponding to
< tt class = "literal" >< span class = "pre" > iterator_traits< Derived> ::iterator_category</ span ></ tt > , the expressions
involving < tt class = "literal" >< span class = "pre" > m_iterator</ span ></ tt > in the specifications of those private
member functions of < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > that may be called by
< tt class = "literal" >< span class = "pre" > iterator_facade< Derived,</ span > < span class = "pre" > ``\</ span > < span class = "pre" > *V*\</ span ></ tt > , < tt class = "literal" >< span class = "pre" > \</ span > < span class = "pre" > *C*\</ span ></ tt > , < tt class = "literal" >< span class = "pre" > \</ span > < span class = "pre" > *R*\</ span ></ tt > , < tt class = "literal" >< span class = "pre" > \</ span >
< span class = "pre" > *D*\</ span ></ tt > > `` in evaluating any valid expression involving < tt class = "literal" >< span class = "pre" > Derived</ span ></ tt >
in those concepts' requirements.</ p >
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</ div >
< div class = "section" id = "iterator-adaptor-public-operations" >
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< h2 >< a class = "toc-backref" href = "#id7" name = "iterator-adaptor-public-operations" >< tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > public operations</ a ></ h2 >
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< p >< tt class = "literal" >< span class = "pre" > iterator_adaptor();</ span ></ tt ></ p >
< table class = "field-list" frame = "void" rules = "none" >
< col class = "field-name" />
< col class = "field-body" />
< tbody valign = "top" >
< tr class = "field" >< th class = "field-name" > Requires:</ th >< td class = "field-body" > The < tt class = "literal" >< span class = "pre" > Base</ span ></ tt > type must be Default Constructible.</ td >
</ tr >
< tr class = "field" >< th class = "field-name" > Returns:</ th >< td class = "field-body" > An instance of < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > with
< tt class = "literal" >< span class = "pre" > m_iterator</ span ></ tt > default constructed.</ td >
</ tr >
</ tbody >
</ table >
< p >< tt class = "literal" >< span class = "pre" > explicit</ span > < span class = "pre" > iterator_adaptor(Base</ span > < span class = "pre" > iter);</ span ></ tt ></ p >
< table class = "field-list" frame = "void" rules = "none" >
< col class = "field-name" />
< col class = "field-body" />
< tbody valign = "top" >
< tr class = "field" >< th class = "field-name" > Returns:</ th >< td class = "field-body" > An instance of < tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > with
< tt class = "literal" >< span class = "pre" > m_iterator</ span ></ tt > copy constructed from < tt class = "literal" >< span class = "pre" > iter</ span ></ tt > .</ td >
</ tr >
</ tbody >
</ table >
< p >< tt class = "literal" >< span class = "pre" > Base</ span > < span class = "pre" > base()</ span > < span class = "pre" > const;</ span ></ tt ></ p >
< table class = "field-list" frame = "void" rules = "none" >
< col class = "field-name" />
< col class = "field-body" />
< tbody valign = "top" >
< tr class = "field" >< th class = "field-name" > Returns:</ th >< td class = "field-body" >< tt class = "literal" >< span class = "pre" > m_iterator</ span ></ tt ></ td >
</ tr >
</ tbody >
</ table >
</ div >
< div class = "section" id = "iterator-adaptor-protected-member-functions" >
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< h2 >< a class = "toc-backref" href = "#id8" name = "iterator-adaptor-protected-member-functions" >< tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > protected member functions</ a ></ h2 >
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< p >< tt class = "literal" >< span class = "pre" > Base</ span > < span class = "pre" > const& </ span > < span class = "pre" > base_reference()</ span > < span class = "pre" > const;</ span ></ tt ></ p >
< table class = "field-list" frame = "void" rules = "none" >
< col class = "field-name" />
< col class = "field-body" />
< tbody valign = "top" >
< tr class = "field" >< th class = "field-name" > Returns:</ th >< td class = "field-body" > A const reference to < tt class = "literal" >< span class = "pre" > m_iterator</ span ></ tt > .</ td >
</ tr >
</ tbody >
</ table >
< p >< tt class = "literal" >< span class = "pre" > Base& </ span > < span class = "pre" > base_reference();</ span ></ tt ></ p >
< table class = "field-list" frame = "void" rules = "none" >
< col class = "field-name" />
< col class = "field-body" />
< tbody valign = "top" >
< tr class = "field" >< th class = "field-name" > Returns:</ th >< td class = "field-body" > A non-const reference to < tt class = "literal" >< span class = "pre" > m_iterator</ span ></ tt > .</ td >
</ tr >
</ tbody >
</ table >
</ div >
< div class = "section" id = "iterator-adaptor-private-member-functions" >
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< h2 >< a class = "toc-backref" href = "#id9" name = "iterator-adaptor-private-member-functions" >< tt class = "literal" >< span class = "pre" > iterator_adaptor</ span ></ tt > private member functions</ a ></ h2 >
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< p >< tt class = "literal" >< span class = "pre" > typename</ span > < span class = "pre" > iterator_adaptor::reference</ span > < span class = "pre" > dereference()</ span > < span class = "pre" > const;</ span ></ tt ></ p >
< table class = "field-list" frame = "void" rules = "none" >
< col class = "field-name" />
< col class = "field-body" />
< tbody valign = "top" >
< tr class = "field" >< th class = "field-name" > Returns:</ th >< td class = "field-body" >< tt class = "literal" >< span class = "pre" > *m_iterator</ span ></ tt ></ td >
</ tr >
</ tbody >
</ table >
< pre class = "literal-block" >
template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D
>
bool equal(iterator_adaptor< OtherDerived, OtherIterator, V, C, R, D> const& x) const;
</ pre >
< table class = "field-list" frame = "void" rules = "none" >
< col class = "field-name" />
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< tr class = "field" >< th class = "field-name" > Returns:</ th >< td class = "field-body" >< tt class = "literal" >< span class = "pre" > m_iterator</ span > < span class = "pre" > ==</ span > < span class = "pre" > x.base()</ span ></ tt ></ td >
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< p >< tt class = "literal" >< span class = "pre" > void</ span > < span class = "pre" > advance(typename</ span > < span class = "pre" > iterator_adaptor::difference_type</ span > < span class = "pre" > n);</ span ></ tt ></ p >
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< tr class = "field" >< th class = "field-name" > Effects:</ th >< td class = "field-body" >< tt class = "literal" >< span class = "pre" > m_iterator</ span > < span class = "pre" > +=</ span > < span class = "pre" > n;</ span ></ tt ></ td >
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< p >< tt class = "literal" >< span class = "pre" > void</ span > < span class = "pre" > increment();</ span ></ tt ></ p >
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< p >< tt class = "literal" >< span class = "pre" > void</ span > < span class = "pre" > decrement();</ span ></ tt ></ p >
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< pre class = "literal-block" >
template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D
>
typename iterator_adaptor::difference_type distance_to(
iterator_adaptor< OtherDerived, OtherIterator, V, C, R, D> const& y) const;
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< tr class = "field" >< th class = "field-name" > Returns:</ th >< td class = "field-body" >< tt class = "literal" >< span class = "pre" > y.base()</ span > < span class = "pre" > -</ span > < span class = "pre" > m_iterator</ span ></ tt ></ td >
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