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< title > Reverse 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" / >
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< meta name = "date" content = "2004-11-01" / >
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< / style >
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< / head >
< body >
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< div class = "document" id = "reverse-iterator" >
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< h1 class = "title" > Reverse Iterator< / 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 > 2004-11-01< / 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.< / td > < / tr >
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< / tbody >
< / table >
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<!-- 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) -->
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< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
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< tr class = "field" > < th class = "field-name" > abstract:< / th > < td class = "field-body" > <!-- 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) -->
The reverse iterator adaptor iterates through the adapted iterator
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range in the opposite direction.< / td >
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< / tr >
< / tbody >
< / table >
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< div class = "contents topic" >
< p class = "topic-title first" > < a id = "table-of-contents" name = "table-of-contents" > Table of Contents< / a > < / p >
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< ul class = "simple" >
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< 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 >
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< li > < a class = "reference" href = "#example" id = "id6" name = "id6" > Example< / a > < / li >
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< / ul >
< / div >
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< 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 >
<!-- 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) -->
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< pre class = "literal-block" >
template < class Iterator>
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class reverse_iterator
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{
public:
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typedef iterator_traits< Iterator> ::value_type value_type;
typedef iterator_traits< Iterator> ::reference reference;
typedef iterator_traits< Iterator> ::pointer pointer;
typedef iterator_traits< Iterator> ::difference_type difference_type;
typedef /* see below */ iterator_category;
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reverse_iterator() {}
explicit reverse_iterator(Iterator x) ;
template< class OtherIterator>
reverse_iterator(
reverse_iterator< OtherIterator> const& r
, typename enable_if_convertible< OtherIterator, Iterator> ::type* = 0 // exposition
);
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Iterator const& base() const;
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reference operator*() const;
reverse_iterator& operator++();
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reverse_iterator& operator--();
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private:
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Iterator m_iterator; // exposition
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};
< / pre >
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< p > If < tt class = "docutils literal" > < span class = "pre" > Iterator< / span > < / tt > models Random Access Traversal Iterator and 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" > random_access_iterator_tag< / span > < / tt > . Otherwise, if
< tt class = "docutils literal" > < span class = "pre" > Iterator< / span > < / tt > models Bidirectional Traversal Iterator and 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" > 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 >
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< / div >
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< 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 >
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< 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 >
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< / div >
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< 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 >
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< 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 >
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argument. In addition, it may model old iterator concepts
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specified in the following table:< / p >
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< table border = "1" class = "docutils" >
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< colgroup >
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< col width = "53%" / >
< col width = "47%" / >
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< / colgroup >
< thead valign = "bottom" >
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< tr > < th class = "head" > If < tt class = "docutils literal" > < span class = "pre" > I< / span > < / tt > models< / th >
< th class = "head" > then < tt class = "docutils literal" > < span class = "pre" > reverse_iterator< I> < / span > < / tt > models< / th >
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< / tr >
< / thead >
< tbody valign = "top" >
< tr > < td > Readable Lvalue Iterator,
Bidirectional Traversal Iterator< / td >
< td > Bidirectional Iterator< / td >
< / tr >
< tr > < td > Writable Lvalue Iterator,
Bidirectional Traversal Iterator< / td >
< td > Mutable Bidirectional Iterator< / td >
< / tr >
< tr > < td > Readable Lvalue Iterator,
Random Access Traversal Iterator< / td >
< td > Random Access Iterator< / td >
< / tr >
< tr > < td > Writable Lvalue Iterator,
Random Access Traversal Iterator< / td >
< td > Mutable Random Access Iterator< / td >
< / tr >
< / tbody >
< / table >
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< p > < tt class = "docutils literal" > < span class = "pre" > reverse_iterator< X> < / span > < / tt > is interoperable with
< 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 >
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< / div >
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< 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 >
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< p > In addition to the operations required by the concepts modeled by
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< 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
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operations.< / p >
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< p > < tt class = "docutils literal" > < span class = "pre" > reverse_iterator();< / span > < / tt > < / p >
< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
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< tr class = "field" > < th class = "field-name" > Requires:< / th > < td class = "field-body" > < tt class = "docutils literal" > < span class = "pre" > Iterator< / span > < / tt > must be Default Constructible.< / td >
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< / tr >
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< tr class = "field" > < th class = "field-name" > Effects:< / th > < td class = "field-body" > Constructs an instance of < tt class = "docutils literal" > < span class = "pre" > reverse_iterator< / span > < / tt > with < tt class = "docutils literal" > < span class = "pre" > m_iterator< / span > < / tt >
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default constructed.< / td >
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< / tr >
< / tbody >
< / table >
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< p > < tt class = "docutils literal" > < span class = "pre" > explicit< / span > < span class = "pre" > reverse_iterator(Iterator< / span > < span class = "pre" > x);< / span > < / tt > < / p >
< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
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< tr class = "field" > < th class = "field-name" > Effects:< / th > < td class = "field-body" > Constructs an instance of < tt class = "docutils literal" > < span class = "pre" > reverse_iterator< / span > < / tt > with
< tt class = "docutils literal" > < span class = "pre" > m_iterator< / span > < / tt > copy constructed from < tt class = "docutils literal" > < span class = "pre" > x< / span > < / tt > .< / td >
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< / tr >
< / tbody >
< / table >
< pre class = "literal-block" >
template< class OtherIterator>
reverse_iterator(
reverse_iterator< OtherIterator> const& r
, typename enable_if_convertible< OtherIterator, Iterator> ::type* = 0 // exposition
);
< / pre >
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< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
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< tr class = "field" > < th class = "field-name" > Requires:< / th > < td class = "field-body" > < tt class = "docutils literal" > < span class = "pre" > OtherIterator< / span > < / tt > is implicitly convertible to < tt class = "docutils literal" > < span class = "pre" > Iterator< / span > < / tt > .< / td >
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< / tr >
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< tr class = "field" > < th class = "field-name" > Effects:< / th > < td class = "field-body" > Constructs instance of < tt class = "docutils literal" > < span class = "pre" > reverse_iterator< / span > < / tt > whose
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< tt class = "docutils literal" > < span class = "pre" > m_iterator< / span > < / tt > subobject is constructed from < tt class = "docutils literal" > < span class = "pre" > y.base()< / span > < / tt > .< / td >
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< / tr >
< / tbody >
< / table >
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< p > < tt class = "docutils literal" > < span class = "pre" > Iterator< / span > < span class = "pre" > const& < / span > < span class = "pre" > base()< / span > < span class = "pre" > const;< / span > < / tt > < / p >
< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
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< tr class = "field" > < th class = "field-name" > Returns:< / th > < td class = "field-body" > < tt class = "docutils literal" > < span class = "pre" > m_iterator< / span > < / tt > < / td >
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< / tr >
< / tbody >
< / table >
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< p > < tt class = "docutils literal" > < span class = "pre" > reference< / span > < span class = "pre" > operator*()< / span > < span class = "pre" > const;< / span > < / tt > < / p >
< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
< tr class = "field" > < th class = "field-name" > Effects:< / th > < td class = "field-body" > < / td >
< / tr >
< / tbody >
< / table >
< pre class = "literal-block" >
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Iterator tmp = m_iterator;
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return *--tmp;
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< / pre >
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< p > < tt class = "docutils literal" > < span class = "pre" > reverse_iterator& < / span > < span class = "pre" > operator++();< / span > < / tt > < / p >
< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
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< tr class = "field" > < th class = "field-name" > Effects:< / th > < td class = "field-body" > < tt class = "docutils literal" > < span class = "pre" > --m_iterator< / span > < / tt > < / td >
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< / tr >
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< tr class = "field" > < th class = "field-name" > Returns:< / th > < td class = "field-body" > < tt class = "docutils literal" > < span class = "pre" > *this< / span > < / tt > < / td >
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< / tr >
< / tbody >
< / table >
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< p > < tt class = "docutils literal" > < span class = "pre" > reverse_iterator& < / span > < span class = "pre" > operator--();< / span > < / tt > < / p >
< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
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< tr class = "field" > < th class = "field-name" > Effects:< / th > < td class = "field-body" > < tt class = "docutils literal" > < span class = "pre" > ++m_iterator< / span > < / tt > < / td >
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< / tr >
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< tr class = "field" > < th class = "field-name" > Returns:< / th > < td class = "field-body" > < tt class = "docutils literal" > < span class = "pre" > *this< / span > < / tt > < / td >
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< / tr >
< / tbody >
< / table >
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<!-- 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) -->
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< pre class = "literal-block" >
template < class BidirectionalIterator>
reverse_iterator< BidirectionalIterator> n
make_reverse_iterator(BidirectionalIterator x);
< / pre >
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< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
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< tr class = "field" > < th class = "field-name" > Returns:< / th > < td class = "field-body" > An instance of < tt class = "docutils literal" > < span class = "pre" > reverse_iterator< BidirectionalIterator> < / span > < / tt >
with a < tt class = "docutils literal" > < span class = "pre" > current< / span > < / tt > constructed from < tt class = "docutils literal" > < span class = "pre" > x< / span > < / tt > .< / td >
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< / tr >
< / tbody >
< / table >
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<!-- 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) -->
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< / div >
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< div class = "section" >
< h1 > < a class = "toc-backref" href = "#id6" id = "example" name = "example" > Example< / a > < / h1 >
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< p > The following example prints an array of characters in reverse order
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using < tt class = "docutils literal" > < span class = "pre" > reverse_iterator< / span > < / tt > .< / p >
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< pre class = "literal-block" >
char letters_[] = " hello world!" ;
const int N = sizeof(letters_)/sizeof(char) - 1;
typedef char* base_iterator;
base_iterator letters(letters_);
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std::cout < < " original sequence of letters:\t\t\t" < < letters_ < < std::endl;
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boost::reverse_iterator< base_iterator>
reverse_letters_first(letters + N),
reverse_letters_last(letters);
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std::cout < < " sequence in reverse order:\t\t\t" ;
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std::copy(reverse_letters_first, reverse_letters_last,
std::ostream_iterator< char> (std::cout));
std::cout < < std::endl;
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std::cout < < " sequence in double-reversed (normal) order:\t" ;
std::copy(boost::make_reverse_iterator(reverse_letters_last),
boost::make_reverse_iterator(reverse_letters_first),
std::ostream_iterator< char> (std::cout));
std::cout < < std::endl;
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< / pre >
< p > The output is:< / p >
< pre class = "literal-block" >
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original sequence of letters: hello world!
sequence in reverse order: !dlrow olleh
sequence in double-reversed (normal) order: hello world!
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< / pre >
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< p > The source code for this example can be found < a class = "reference" href = "../example/reverse_iterator_example.cpp" > here< / a > .< / p >
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< / div >
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< / div >
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< / body >
< / html >
