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< title > The MPL Reference Manual: equal</ title >
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< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./max-element.html" class = "navigation-link" > Prev</ a > < a href = "./transformation-algorithms.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./max-element.html" class = "navigation-link" > Back</ a > Along</ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./querying-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 = "./querying-algorithms.html" class = "navigation-link" > Querying Algorithms</ a > / < a href = "./equal.html" class = "navigation-link" > equal</ a ></ td >
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< div class = "section" id = "equal" >
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< h1 >< a class = "toc-backref" href = "./querying-algorithms.html#id1484" > equal</ a ></ h1 >
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< div class = "section" id = "id607" >
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< h3 >< a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis</ a ></ h3 >
< pre class = "literal-block" >
template<
typename Seq1
, typename Seq2
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, typename Pred = is_same< < a href = "./placeholders.html" class = "identifier" > _1</ a > ,< a href = "./placeholders.html" class = "identifier" > _2</ a > >
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>
struct < a href = "./equal.html" class = "identifier" > equal</ a >
{
typedef < em > unspecified</ em > type;
};
</ pre >
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< div class = "section" id = "id608" >
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< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
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< p > Returns a true-valued < a class = "reference internal" href = "./integral-constant.html" > Integral Constant</ a > if the two sequences < tt class = "literal" >< span class = "pre" > Seq1</ span ></ tt >
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and < tt class = "literal" >< span class = "pre" > Seq2</ span ></ tt > are identical when compared element-by-element.</ p >
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< div class = "section" id = "id609" >
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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/equal.hpp" class = "header" > boost/mpl/equal.hpp</ a > >
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< div class = "section" id = "id610" >
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< h3 >< a class = "subsection-title" href = "#parameters" name = "parameters" > Parameters</ a ></ h3 >
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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 >
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< tbody valign = "top" >
< tr >< td >< tt class = "literal" >< span class = "pre" > Seq1</ span ></ tt > , < tt class = "literal" >< span class = "pre" > Seq2</ 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 > Sequences to compare.</ 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 > A comparison criterion.</ td >
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< div class = "section" id = "id611" >
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< h3 >< a class = "subsection-title" href = "#expression-semantics" name = "expression-semantics" > Expression semantics</ a ></ h3 >
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< p > For any < a class = "reference internal" href = "./forward-sequence.html" > Forward Sequence</ a > s < tt class = "literal" >< span class = "pre" > s1</ span ></ tt > and < tt class = "literal" >< span class = "pre" > s2</ span ></ tt > and a binary < a class = "reference internal" href = "./lambda-expression.html" > Lambda Expression</ a > < tt class = "literal" >< span class = "pre" > pred</ span ></ tt > :</ p >
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< pre class = "literal-block" >
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typedef < a href = "./equal.html" class = "identifier" > equal</ a > < s1,s2,pred> ::type c;
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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 class = "reference internal" href = "./integral-constant.html" > Integral Constant</ a ></ p >
</ td >
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</ tr >
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< tr class = "field" >< th class = "field-name" > Semantics:</ th >< td class = "field-body" >< p class = "first" >< tt class = "literal" >< span class = "pre" > c::value</ span > < span class = "pre" > ==</ span > < span class = "pre" > true</ span ></ tt > is and only if < tt class = "literal" >< span class = "pre" >< a href = "./size.html" class = "identifier" > size</ a > < s1> ::value</ span > < span class = "pre" > ==</ span > < span class = "pre" >< a href = "./size.html" class = "identifier" > size</ a > < s2> ::value</ span ></ tt >
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and for every iterator < tt class = "literal" >< span class = "pre" > i</ span ></ tt > in [< tt class = "literal" >< span class = "pre" >< a href = "./begin.html" class = "identifier" > begin</ a > < s1> ::type</ span ></ tt > , < tt class = "literal" >< span class = "pre" >< a href = "./end.html" class = "identifier" > end</ a > < s1> ::type</ span ></ tt > ) < tt class = "literal" >< span class = "pre" >< a href = "./deref.html" class = "identifier" > deref</ a > < i> ::type</ span ></ tt > is identical to</ p >
< pre class = "last literal-block" >
< a href = "./advance.html" class = "identifier" > advance</ a > < < a href = "./begin.html" class = "identifier" > begin</ a > < s2> ::type, < a href = "./distance.html" class = "identifier" > distance</ a > < < a href = "./begin.html" class = "identifier" > begin</ a > < s1> ::type,i > ::type > ::type
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< div class = "section" id = "id612" >
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< h3 >< a class = "subsection-title" href = "#complexity" name = "complexity" > Complexity</ a ></ h3 >
< p > Linear. At most < tt class = "literal" >< span class = "pre" >< a href = "./size.html" class = "identifier" > size</ a > < s1> ::value</ span ></ tt > comparisons.</ p >
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< div class = "section" id = "id613" >
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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 > < char,int,unsigned,long,unsigned long> s1;
typedef < a href = "./list.html" class = "identifier" > list</ a > < char,int,unsigned,long,unsigned long> s2;
< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT</ a > (( < a href = "./equal.html" class = "identifier" > equal</ a > < s1,s2> ));
</ pre >
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< div class = "section" id = "id614" >
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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 = "./querying-algorithms.html" > Querying Algorithms</ a > , < a class = "reference internal" href = "./find.html" > find</ a > , < a class = "reference internal" href = "./find-if.html" > find_if</ a ></ p >
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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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