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< title > The MPL Reference Manual: Bidirectional Sequence</ title >
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< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./forward-sequence.html" class = "navigation-link" > Prev</ a > < a href = "./random-access-sequence.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./forward-sequence.html" class = "navigation-link" > Back</ a > < a href = "./random-access-sequence.html" class = "navigation-link" > Along</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./concepts.html" class = "navigation-link" > Up</ a > < a href = "../refmanual.html" class = "navigation-link" > Home</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./refmanual_toc.html" class = "navigation-link" > Full TOC</ a ></ span ></ td >
< td class = "header-group page-location" >< a href = "../refmanual.html" class = "navigation-link" > Front Page</ a > / < a href = "./sequences.html" class = "navigation-link" > Sequences</ a > / < a href = "./concepts.html" class = "navigation-link" > Concepts</ a > / < a href = "./bidirectional-sequence.html" class = "navigation-link" > Bidirectional Sequence</ a ></ td >
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< div class = "section" id = "bidirectional-sequence" >
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< h1 >< a class = "toc-backref" href = "./concepts.html#id1396" > Bidirectional Sequence</ a ></ h1 >
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< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
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< p > A < a class = "reference internal" href = "./bidirectional-sequence.html" > Bidirectional Sequence</ a > is a < a class = "reference internal" href = "./forward-sequence.html" > Forward Sequence</ a > whose iterators model
< a class = "reference internal" href = "./bidirectional-iterator.html" > Bidirectional Iterator</ a > .</ p >
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< div class = "section" id = "refinement-of" >
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< h3 > Refinement of</ h3 >
< p >< a class = "reference internal" href = "./forward-sequence.html" > Forward Sequence</ a ></ p >
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< h3 >< a class = "subsection-title" href = "#expression-requirements" name = "expression-requirements" > Expression requirements</ a ></ h3 >
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< p > In addition to the requirements defined in < a class = "reference internal" href = "./forward-sequence.html" > Forward Sequence</ a > ,
for any < a class = "reference internal" href = "./bidirectional-sequence.html" > Bidirectional Sequence</ a > < tt class = "literal" >< span class = "pre" > s</ span ></ tt > the following must be met:</ p >
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< tr >< th class = "head" > Expression</ th >
< th class = "head" > Type</ th >
< th class = "head" > Complexity</ th >
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< tr >< td >< tt class = "literal" >< span class = "pre" >< a href = "./begin.html" class = "identifier" > begin</ a > < s> ::type</ span ></ tt ></ td >
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< td >< a class = "reference internal" href = "./bidirectional-iterator.html" > Bidirectional Iterator</ a ></ td >
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< td > Amortized constant time</ td >
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< tr >< td >< tt class = "literal" >< span class = "pre" >< a href = "./end.html" class = "identifier" > end</ a > < s> ::type</ span ></ tt ></ td >
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< td >< a class = "reference internal" href = "./bidirectional-iterator.html" > Bidirectional Iterator</ a ></ td >
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< td > Amortized constant time</ td >
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< tr >< td >< tt class = "literal" >< span class = "pre" >< a href = "./back.html" class = "identifier" > back</ a > < s> ::type</ span ></ tt ></ td >
< td > Any type</ td >
< td > Amortized constant time</ td >
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< div class = "section" id = "id3" >
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< h3 >< a class = "subsection-title" href = "#expression-semantics" name = "expression-semantics" > Expression semantics</ a ></ h3 >
< p > The semantics of an expression are defined only
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where they differ from, or are not defined in < a class = "reference internal" href = "./forward-sequence.html" > Forward Sequence</ a > .</ p >
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< tr >< th class = "head" > Expression</ th >
< th class = "head" > Semantics</ th >
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< tr >< td >< tt class = "literal" >< span class = "pre" >< a href = "./back.html" class = "identifier" > back</ a > < s> ::type</ span ></ tt ></ td >
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< td > The last element in the sequence; see < a class = "reference internal" href = "./back.html" > back</ a > .</ td >
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< div class = "section" id = "id4" >
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< h3 >< a class = "subsection-title" href = "#models" name = "models" > Models</ a ></ h3 >
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< li >< a class = "reference internal" href = "./vector.html" > vector</ a ></ li >
< li >< a class = "reference internal" href = "./range-c.html" > range_c</ a ></ li >
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</ ul >
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< h3 >< a class = "subsection-title" href = "#see-also" name = "see-also" > See also</ a ></ h3 >
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< p >< a class = "reference internal" href = "./sequences.html" > Sequences</ a > , < a class = "reference internal" href = "./forward-sequence.html" > Forward Sequence</ a > , < a class = "reference internal" href = "./random-access-sequence.html" > Random Access Sequence</ a > , < a class = "reference internal" href = "./bidirectional-iterator.html" > Bidirectional Iterator</ a > , < a class = "reference internal" href = "./begin.html" > begin</ a > / < a class = "reference internal" href = "./end.html" > end</ a > , < a class = "reference internal" href = "./back.html" > back</ a ></ p >
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<!-- Sequences/Concepts//Random Access Sequence |30 -->
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< table class = "footer" >< tr class = "footer" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./forward-sequence.html" class = "navigation-link" > Prev</ a > < a href = "./random-access-sequence.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./forward-sequence.html" class = "navigation-link" > Back</ a > < a href = "./random-access-sequence.html" class = "navigation-link" > Along</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./concepts.html" class = "navigation-link" > Up</ a > < a href = "../refmanual.html" class = "navigation-link" > Home</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./refmanual_toc.html" class = "navigation-link" > Full TOC</ a ></ span ></ td >
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< td >< div class = "copyright-footer" >< div class = "copyright" > Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</ div >
Distributed under the Boost Software License, Version 1.0. (See accompanying
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