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< title > The MPL Reference Manual: pair</ title >
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< td class = "header-group page-location" >< a href = "../refmanual.html" class = "navigation-link" > Front Page</ a > / < a href = "./data-types.html" class = "navigation-link" > Data Types</ a > / < a href = "./data-types-miscellaneous.html" class = "navigation-link" > Miscellaneous</ a > / < a href = "./pair.html" class = "navigation-link" > pair</ a ></ td >
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< h1 >< a class = "toc-backref" href = "./data-types-miscellaneous.html#id1583" > pair</ a ></ h1 >
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< div class = "section" id = "id1271" >
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< h3 >< a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis</ a ></ h3 >
< pre class = "literal-block" >
template<
typename T1
, typename T2
>
struct < a href = "./pair.html" class = "identifier" > pair</ a >
{
typedef < a href = "./pair.html" class = "identifier" > pair</ a > type;
typedef T1 first;
typedef T2 second;
};
</ pre >
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< div class = "section" id = "id1272" >
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< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
< p > A transparent holder for two arbitrary types.</ p >
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< div class = "section" id = "id1273" >
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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/pair.hpp" class = "header" > boost/mpl/pair.hpp</ a > >
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< div class = "section" id = "id1274" >
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< h3 >< a class = "subsection-title" href = "#example" name = "example" > Example</ a ></ h3 >
< p > Count a number of elements in the sequence together with a number of negative
elements among these.</ p >
< pre class = "literal-block" >
typedef < a href = "./fold.html" class = "identifier" > fold</ a > <
< a href = "./vector-c.html" class = "identifier" > vector_c</ a > < int,-1,0,5,-7,-2,4,5,7>
, < a href = "./pair.html" class = "identifier" > pair</ a > < < a href = "./int.html" class = "identifier" > int_</ a > < 0> , < a href = "./int.html" class = "identifier" > int_</ a > < 0> >
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, < a href = "./pair.html" class = "identifier" > pair</ a > <
< a href = "./next.html" class = "identifier" > next</ a > < first< < a href = "./placeholders.html" class = "identifier" > _1</ a > > >
, < a href = "./if.html" class = "identifier" > if_</ a > <
< a href = "./less.html" class = "identifier" > less</ a > < < a href = "./placeholders.html" class = "identifier" > _2</ a > , < a href = "./int.html" class = "identifier" > int_</ a > < 0> >
, < a href = "./next.html" class = "identifier" > next</ a > < second< < a href = "./placeholders.html" class = "identifier" > _1</ a > > >
, second< < a href = "./placeholders.html" class = "identifier" > _1</ a > >
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>
>
> ::type p;
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( p::first::value, ==, 8 );
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( p::second::value, ==, 3 );
</ pre >
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< div class = "section" id = "id1275" >
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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 = "./data-types.html" > Data Types</ a > , < a class = "reference internal" href = "./sequences.html" > Sequences</ a > , < a class = "reference internal" href = "./trivial-metafunctions-summary.html#first" > first</ a > , < a class = "reference internal" href = "./trivial-metafunctions-summary.html#second" > second</ 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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