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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;
};
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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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< 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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< 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 );
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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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