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< title > The MPL Reference Manual: apply</ title >
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< body class = "docframe refmanual" >
< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./invocation.html" class = "navigation-link" > Prev</ a > < a href = "./apply-wrap.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" > Back < a href = "./apply-wrap.html" class = "navigation-link" > Along</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./invocation.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 = "./metafunctions.html" class = "navigation-link" > Metafunctions</ a > / < a href = "./invocation.html" class = "navigation-link" > Invocation</ a > / < a href = "./apply.html" class = "navigation-link" > apply</ a ></ td >
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< div class = "section" id = "apply" >
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< h1 >< a class = "toc-backref" href = "./invocation.html#id1525" > apply</ a ></ h1 >
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< div class = "section" id = "id887" >
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< h3 >< a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis</ a ></ h3 >
< pre class = "literal-block" >
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template<
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typename F
>
struct apply0
{
typedef < em > unspecified</ em > type;
};
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template<
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typename F, typename A1
>
struct apply1
{
typedef < em > unspecified</ em > type;
};
< em > ...</ em >
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template<
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typename F, typename A1,< em > ...</ em > typename An
>
struct < a href = "./apply.html" class = "identifier" > apply</ a >< em > n</ em >
{
typedef < em > unspecified</ em > type;
};
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template<
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typename F
, typename A1 = < em > unspecified</ em >
< em > ...</ em >
, typename An = < em > unspecified</ em >
>
struct < a href = "./apply.html" class = "identifier" > apply</ a >
{
typedef < em > unspecified</ em > type;
};
</ pre >
</ div >
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< div class = "section" id = "id888" >
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< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
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< p > Invokes a < a class = "reference internal" href = "./metafunction-class.html" > Metafunction Class</ a > or a < a class = "reference internal" href = "./lambda-expression.html" > Lambda Expression</ a > < tt class = "literal" >< span class = "pre" > F</ span ></ tt > with arguments < tt class = "literal" >< span class = "pre" > A1</ span ></ tt > ,... < tt class = "literal" >< span class = "pre" > An</ span ></ tt > .</ p >
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</ div >
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< div class = "section" id = "id889" >
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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/apply.hpp" class = "header" > boost/mpl/apply.hpp</ a > >
</ pre >
</ div >
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< div class = "section" id = "id890" >
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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 >
< col width = "15%" />
< col width = "36%" />
< col width = "48%" />
</ colgroup >
< 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" > F</ span ></ tt ></ td >
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< td >< a class = "reference internal" href = "./lambda-expression.html" > Lambda Expression</ a ></ td >
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< td > An expression to invoke.</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" > A1</ span ></ tt > ,... < tt class = "literal" >< span class = "pre" > An</ span ></ tt ></ td >
< td > Any type</ td >
< td > Invocation arguments.</ td >
</ tr >
</ tbody >
</ table >
</ div >
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< div class = "section" id = "id891" >
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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 = "./lambda-expression.html" > Lambda Expression</ a > < tt class = "literal" >< span class = "pre" > f</ span ></ tt > and arbitrary types < tt class = "literal" >< span class = "pre" > a1</ span ></ tt > ,... < tt class = "literal" >< span class = "pre" > an</ span ></ tt > :</ p >
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< pre class = "literal-block" >
typedef < a href = "./apply.html" class = "identifier" > apply</ a >< em > n</ em > < f,a1,< em > ...</ em > a< em > n</ em > > ::type t;
typedef < a href = "./apply.html" class = "identifier" > apply</ a > < f,a1,< em > ...</ em > a< em > n</ em > > ::type t;
</ pre >
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< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" />
< col class = "field-body" />
< tbody valign = "top" >
< tr class = "field" >< th class = "field-name" > Return type:</ th >< td class = "field-body" > Any type.</ td >
</ tr >
< tr class = "field" >< th class = "field-name" > Semantics:</ th >< td class = "field-body" > Equivalent to < tt class = "literal" >< span class = "pre" > typedef</ span > < span class = "pre" >< a href = "./apply-wrap.html" class = "identifier" > apply_wrap</ a ></ span ></ tt >< em > n</ em >< tt class = "literal" >< span class = "pre" > < </ span > < span class = "pre" >< a href = "./lambda.html" class = "identifier" > lambda</ a > < f> ::type,a1,...</ span > < span class = "pre" > an> ::type</ span > < span class = "pre" > t;</ span ></ tt > .</ td >
</ tr >
</ tbody >
</ table >
</ div >
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< div class = "section" id = "id892" >
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< h3 >< a class = "subsection-title" href = "#example" name = "example" > Example</ a ></ h3 >
< pre class = "literal-block" >
template< typename N1, typename N2 > struct int_plus
: < a href = "./int.html" class = "identifier" > int_</ a > < ( N1::value + N2::value )>
{
};
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typedef < a href = "./apply.html" class = "identifier" > apply</ a > < int_plus< < a href = "./placeholders.html" class = "identifier" > _1</ a > ,< a href = "./placeholders.html" class = "identifier" > _2</ a > > , < a href = "./int.html" class = "identifier" > int_</ a > < 2> , < a href = "./int.html" class = "identifier" > int_</ a > < 3> > ::type r1;
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typedef < a href = "./apply.html" class = "identifier" > apply</ a > < < a href = "./quote.html" class = "identifier" > quote</ a >< tt class = "literal" >< span class = "pre" > 2</ span ></ tt > < int_plus> , < a href = "./int.html" class = "identifier" > int_</ a > < 2> , < a href = "./int.html" class = "identifier" > int_</ a > < 3> > ::type r2;
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( r1::value, ==, 5 );
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( r2::value, ==, 5 );
</ pre >
</ div >
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< div class = "section" id = "id893" >
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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 = "./metafunctions.html" > Metafunctions</ a > , < a class = "reference internal" href = "./apply-wrap.html" > apply_wrap</ a > , < a class = "reference internal" href = "./lambda.html" > lambda</ a > , < a class = "reference internal" href = "./quote.html" > quote</ a > , < a class = "reference internal" href = "./bind.html" > bind</ a ></ p >
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<!-- Metafunctions/Invocation//apply_wrap |20 -->
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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
file LICENSE_1_0.txt or copy at < a class = "reference external" href = "http://www.boost.org/LICENSE_1_0.txt" target = "_top" > http://www.boost.org/LICENSE_1_0.txt</ a > )</ div ></ td ></ tr ></ table ></ body >
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