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< title > The MPL Reference Manual: arg< / title >
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< 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 = "./composition-and-argument-binding.html" class = "navigation-link" > Composition and Argument Binding< / a > / < a href = "./arg.html" class = "navigation-link" > arg< / a > < / td >
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< div class = "section" id = "arg" >
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< h1 > < a class = "toc-backref" href = "./composition-and-argument-binding.html#id1533" > arg< / a > < / h1 >
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< div class = "section" id = "id946" >
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< h3 > < a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis< / a > < / h3 >
< pre class = "literal-block" >
template< int n > struct < a href = "./arg.html" class = "identifier" > arg< / a > ;
template< > struct < a href = "./arg.html" class = "identifier" > arg< / a > < 1>
{
template< typename A1,< em > ...< / em > typename A< em > n< / em > = < em > unspecified< / em > >
struct < a href = "./apply.html" class = "identifier" > apply< / a >
{
typedef A1 type;
};
};
< em > ...< / em >
template< > struct < a href = "./arg.html" class = "identifier" > arg< / a > < < em > n< / em > >
{
template< typename A1,< em > ...< / em > typename A< em > n< / em > >
struct < a href = "./apply.html" class = "identifier" > apply< / a >
{
typedef A< em > n< / em > type;
};
};
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< div class = "section" id = "id947" >
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< h3 > < a class = "subsection-title" href = "#description" name = "description" > Description< / a > < / h3 >
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< p > < tt class = "literal" > < span class = "pre" > < a href = "./arg.html" class = "identifier" > arg< / a > < n> < / span > < / tt > specialization is a < a class = "reference internal" href = "./metafunction-class.html" > Metafunction Class< / a > that return the < tt class = "literal" > < span class = "pre" > n< / span > < / tt > th of its arguments.< / 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/arg.hpp" class = "header" > boost/mpl/arg.hpp< / a > >
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< div class = "section" id = "id949" >
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< h3 > < a class = "subsection-title" href = "#parameters" name = "parameters" > Parameters< / a > < / h3 >
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< colgroup >
< col width = "15%" / >
< col width = "36%" / >
< col width = "48%" / >
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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" > n< / span > < / tt > < / td >
< td > An integral constant< / td >
< td > A number of argument to return.< / td >
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< div class = "section" id = "id950" >
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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 integral constant < tt class = "literal" > < span class = "pre" > n< / span > < / tt > in the range [1, < a class = "reference internal" href = "./limit-metafunction-arity.html" > BOOST_MPL_LIMIT_METAFUNCTION_ARITY< / a > ] and
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arbitrary types < tt class = "literal" > < span class = "pre" > a1< / span > < / tt > ,... < tt class = "literal" > < span class = "pre" > an< / span > < / tt > :< / p >
< pre class = "literal-block" >
typedef < a href = "./apply-wrap.html" class = "identifier" > apply_wrap< / a > < em > n< / em > < < a href = "./arg.html" class = "identifier" > arg< / a > < < em > n< / em > > ,a1,< em > ...< / em > a< em > n< / em > > ::type x;
< / 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" / >
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< tr class = "field" > < th class = "field-name" > Return type:< / th > < td class = "field-body" > A type.< / td >
< / tr >
< tr class = "field" > < th class = "field-name" > Semantics:< / th > < td class = "field-body" > < tt class = "literal" > < span class = "pre" > x< / span > < / tt > is identical to < tt class = "literal" > < span class = "pre" > an< / span > < / tt > .< / td >
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< h3 > < a class = "subsection-title" href = "#example" name = "example" > Example< / a > < / h3 >
< pre class = "literal-block" >
typedef < a href = "./apply-wrap.html" class = "identifier" > apply_wrap< / a > < tt class = "literal" > < span class = "pre" > 5< / span > < / tt > < < a href = "./arg.html" class = "identifier" > arg< / a > < 1> ,bool,char,short,int,long > ::type t1;
typedef < a href = "./apply-wrap.html" class = "identifier" > apply_wrap< / a > < tt class = "literal" > < span class = "pre" > 5< / span > < / tt > < < a href = "./arg.html" class = "identifier" > arg< / a > < 3> ,bool,char,short,int,long > ::type t3;
< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT< / a > (( is_same< t1, bool > ));
< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT< / a > (( is_same< t3, short > ));
< / pre >
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< div class = "section" id = "id952" >
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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 = "./composition-and-argument-binding.html" > Composition and Argument Binding< / a > , < a class = "reference internal" href = "./placeholders.html" > Placeholders< / a > , < a class = "reference internal" href = "./lambda.html" > lambda< / a > , < a class = "reference internal" href = "./bind.html" > bind< / a > , < a class = "reference internal" href = "./apply.html" > apply< / a > , < a class = "reference internal" href = "./apply-wrap.html" > apply_wrap< / 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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