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< title > The MPL Reference Manual: reverse_unique</ title >
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< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./reverse-remove-if.html" class = "navigation-link" > Prev</ a > < a href = "./reverse-partition.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./reverse-remove-if.html" class = "navigation-link" > Back</ a > < a href = "./reverse-partition.html" class = "navigation-link" > Along</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./transformation-algorithms.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 = "./algorithms.html" class = "navigation-link" > Algorithms</ a > / < a href = "./transformation-algorithms.html" class = "navigation-link" > Transformation Algorithms</ a > / < a href = "./reverse-unique.html" class = "navigation-link" > reverse_unique</ a ></ td >
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< div class = "section" id = "reverse-unique" >
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< h1 >< a class = "toc-backref" href = "./transformation-algorithms.html#id1505" > reverse_unique</ a ></ h1 >
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< div class = "section" id = "id785" >
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< h3 >< a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis</ a ></ h3 >
< pre class = "literal-block" >
template<
typename Seq
, typename Pred
, typename In = < em > unspecified</ em >
>
struct < a href = "./reverse-unique.html" class = "identifier" > reverse_unique</ a >
{
typedef < em > unspecified</ em > type;
};
</ pre >
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< div class = "section" id = "id786" >
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< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
< p > Returns a sequence of the initial elements of every subrange of the
reversed original sequence < tt class = "literal" >< span class = "pre" > Seq</ span ></ tt > whose elements are all the same.</ p >
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< p > [< em > Note:</ em > This wording applies to a no-inserter version(s) of the algorithm. See the
< cite > Expression semantics</ cite > subsection for a precise specification of the algorithm's
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details in all cases — < em > end note</ em > ]</ p >
</ div >
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< div class = "section" id = "id787" >
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< h3 >< a class = "subsection-title" href = "#header" name = "header" > Header</ a ></ h3 >
< pre class = "literal-block" >
#include < < a href = "../../../../boost/mpl/unique.hpp" class = "header" > boost/mpl/unique.hpp</ a > >
</ pre >
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< div class = "section" id = "id788" >
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< h3 >< a class = "subsection-title" href = "#model-of" name = "model-of" > Model of</ a ></ h3 >
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< p >< a class = "reference internal" href = "./reversible-algorithm.html" > Reversible Algorithm</ a ></ p >
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</ div >
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< div class = "section" id = "id789" >
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< h3 >< a class = "subsection-title" href = "#parameters" name = "parameters" > Parameters</ a ></ h3 >
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< table border = "1" class = "docutils table" >
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< colgroup >
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< thead valign = "bottom" >
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< tr >< th class = "head" > Parameter</ th >
< th class = "head" > Requirement</ th >
< th class = "head" > Description</ th >
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</ tr >
</ thead >
< tbody valign = "top" >
< tr >< td >< tt class = "literal" >< span class = "pre" > Sequence</ span ></ tt ></ td >
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< td >< a class = "reference internal" href = "./forward-sequence.html" > Forward Sequence</ a ></ td >
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< td > An original sequence.</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" > Pred</ span ></ tt ></ td >
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< td > Binary < a class = "reference internal" href = "./lambda-expression.html" > Lambda Expression</ a ></ td >
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< td > An equivalence relation.</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" > In</ span ></ tt ></ td >
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< td >< a class = "reference internal" href = "./inserter.html" > Inserter</ a ></ td >
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< td > An inserter.</ td >
</ tr >
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< div class = "section" id = "id790" >
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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 = "./reversible-algorithm.html" > Reversible Algorithm</ a > .</ p >
< p > For any < a class = "reference internal" href = "./forward-sequence.html" > Forward Sequence</ a > < tt class = "literal" >< span class = "pre" > s</ span ></ tt > , a binary < a class = "reference internal" href = "./lambda-expression.html" > Lambda Expression</ a > < tt class = "literal" >< span class = "pre" > pred</ span ></ tt > ,
and an < a class = "reference internal" href = "./inserter.html" > Inserter</ a > < tt class = "literal" >< span class = "pre" > in</ span ></ tt > :</ p >
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< pre class = "literal-block" >
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typedef < a href = "./reverse-unique.html" class = "identifier" > reverse_unique</ a > < s,pred,in> ::type r;
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</ pre >
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< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" />
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< tr class = "field" >< th class = "field-name" > Return type:</ th >< td class = "field-body" >< p class = "first" > A type.</ p >
</ td >
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</ tr >
< tr class = "field" >< th class = "field-name" > Semantics:</ th >< td class = "field-body" >< p class = "first" > If < tt class = "literal" >< span class = "pre" >< a href = "./size.html" class = "identifier" > size</ a > < s> ::value</ span > < span class = "pre" > < =</ span > < span class = "pre" > 1</ span ></ tt > , then equivalent to</ p >
< pre class = "literal-block" >
typedef < a href = "./reverse-copy.html" class = "identifier" > reverse_copy</ a > < s,in> ::type r;
</ pre >
< p > otherwise equivalent to</ p >
< pre class = "last literal-block" >
typedef < a href = "./lambda.html" class = "identifier" > lambda</ a > < pred> ::type p;
typedef < a href = "./lambda.html" class = "identifier" > lambda</ a > < in::operation> ::type in_op;
typedef < a href = "./apply-wrap.html" class = "identifier" > apply_wrap</ a >< tt class = "literal" >< span class = "pre" > 2</ span ></ tt > <
in_op
, in::state
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, < a href = "./front.html" class = "identifier" > front</ a > < types> ::type
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> ::type in_state;
typedef < a href = "./reverse-fold.html" class = "identifier" > reverse_fold</ a > <
s
, < a href = "./pair.html" class = "identifier" > pair</ a > < in_state, < a href = "./front.html" class = "identifier" > front</ a > < s> ::type >
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, < a href = "./eval-if.html" class = "identifier" > eval_if</ a > <
< a href = "./apply-wrap.html" class = "identifier" > apply_wrap</ a >< tt class = "literal" >< span class = "pre" > 2</ span ></ tt > < p, second< < a href = "./placeholders.html" class = "identifier" > _1</ a > > , < a href = "./placeholders.html" class = "identifier" > _2</ a > >
, < a href = "./identity.html" class = "identifier" > identity</ a > < first< < a href = "./placeholders.html" class = "identifier" > _1</ a > > >
, < a href = "./apply-wrap.html" class = "identifier" > apply_wrap</ a >< tt class = "literal" >< span class = "pre" > 2</ span ></ tt > < in_op, first< < a href = "./placeholders.html" class = "identifier" > _1</ a > > , < a href = "./placeholders.html" class = "identifier" > _2</ a > >
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>
> ::type::first r;
</ pre >
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< div class = "section" id = "id791" >
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< h3 >< a class = "subsection-title" href = "#complexity" name = "complexity" > Complexity</ a ></ h3 >
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< p > Linear. Performs exactly < tt class = "literal" >< span class = "pre" >< a href = "./size.html" class = "identifier" > size</ a > < s> ::value</ span > < span class = "pre" > -</ span > < span class = "pre" > 1</ span ></ tt > applications of < tt class = "literal" >< span class = "pre" > pred</ span ></ tt > , and at
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most < tt class = "literal" >< span class = "pre" >< a href = "./size.html" class = "identifier" > size</ a > < s> ::value</ span ></ tt > insertions.</ p >
</ div >
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< div class = "section" id = "id792" >
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< h3 >< a class = "subsection-title" href = "#example" name = "example" > Example</ a ></ h3 >
< pre class = "literal-block" >
typedef < a href = "./vector.html" class = "identifier" > vector</ a > < int,float,float,char,int,int,int,double> types;
typedef < a href = "./vector.html" class = "identifier" > vector</ a > < double,int,char,float,int> expected;
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typedef < a href = "./reverse-unique.html" class = "identifier" > reverse_unique</ a > < types, is_same< < a href = "./placeholders.html" class = "identifier" > _1</ a > ,< a href = "./placeholders.html" class = "identifier" > _2</ a > > > ::type result;
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< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT</ a > (( < a href = "./equal.html" class = "identifier" > equal</ a > < result,expected > ));
</ pre >
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< div class = "section" id = "id793" >
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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 = "./transformation-algorithms.html" > Transformation Algorithms</ a > , < a class = "reference internal" href = "./reversible-algorithm.html" > Reversible Algorithm</ a > , < a class = "reference internal" href = "./unique.html" > unique</ a > , < a class = "reference internal" href = "./reverse-remove.html" > reverse_remove</ a > ,
< a class = "reference internal" href = "./reverse-copy-if.html" > reverse_copy_if</ a > , < a class = "reference internal" href = "./replace-if.html" > replace_if</ a ></ p >
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<!-- Algorithms/Transformation Algorithms//reverse_partition |185 -->
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< table class = "footer" >< tr class = "footer" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./reverse-remove-if.html" class = "navigation-link" > Prev</ a > < a href = "./reverse-partition.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./reverse-remove-if.html" class = "navigation-link" > Back</ a > < a href = "./reverse-partition.html" class = "navigation-link" > Along</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./transformation-algorithms.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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