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< title > The MPL Reference Manual: BOOST_MPL_AUX_LAMBDA_SUPPORT</ title >
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< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./broken-compiler-workarounds.html" class = "navigation-link" > Prev</ a > < a href = "./terminology.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" > Back Along</ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./broken-compiler-workarounds.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 = "./macros.html" class = "navigation-link" > Macros</ a > / < a href = "./broken-compiler-workarounds.html" class = "navigation-link" > Broken Compiler Workarounds</ a > / < a href = "./aux-lambda-support.html" class = "navigation-link" > BOOST_MPL_AUX_LAMBDA_SUPPORT</ a ></ td >
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</ tr ></ table >< div class = "header-separator" ></ div >
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< div class = "section" id = "boost-mpl-aux-lambda-support" >
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< h1 >< a class = "toc-backref" href = "./broken-compiler-workarounds.html#id1609" > BOOST_MPL_AUX_LAMBDA_SUPPORT</ a ></ h1 >
< div class = "section" id = "id1384" >
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< h3 >< a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis</ a ></ h3 >
< pre class = "literal-block" >
#define < a href = "./aux-lambda-support.html" class = "identifier" > BOOST_MPL_AUX_LAMBDA_SUPPORT</ a > (arity, fun, params) \
< em > unspecified token sequence</ em > \
/**/
</ pre >
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< div class = "section" id = "id1385" >
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< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
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< p > Enables metafunction < tt class = "literal" >< span class = "pre" > fun</ span ></ tt > for the use in < a class = "reference internal" href = "./lambda-expression.html" > Lambda Expression</ a > s on
compilers that don't support partial template specialization or/and
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template template parameters. Expands to nothing on conforming compilers.</ p >
</ div >
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< div class = "section" id = "id1386" >
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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/aux_/lambda_support.hpp" class = "header" > boost/mpl/aux_/lambda_support.hpp</ a > >
</ pre >
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< div class = "section" id = "id1387" >
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< h3 >< a class = "subsection-title" href = "#parameters" name = "parameters" > Parameters</ a ></ h3 >
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< col width = "32%" />
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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" > arity</ span ></ tt ></ td >
< td > An integral constant</ td >
< td > The metafunction's arity, i.e. the number of its
template parameters, including the defaults.</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" > fun</ span ></ tt ></ td >
< td > A legal identifier token</ td >
< td > The metafunction's name.</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" > params</ span ></ tt ></ td >
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< td > A < a class = "reference external" href = "http://www.boost.org/libs/preprocessor/doc/data/tuples.html" target = "_top" > PP-tuple</ a ></ td >
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< td > A tuple of the metafunction's parameter names, in
their original order, including the defaults.</ td >
</ tr >
</ tbody >
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< div class = "section" id = "id1388" >
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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 > , a < a class = "reference internal" href = "./metafunction.html" > Metafunction</ a > < tt class = "literal" >< span class = "pre" > fun</ 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" >
template< typename A1,< em > ...</ em > typename A< em > n</ em > > struct fun
{
// < em > ...</ em >
< a href = "./aux-lambda-support.html" class = "identifier" > BOOST_MPL_AUX_LAMBDA_SUPPORT</ a > (n, fun, (A1,< em > ...</ em > A< em > n</ em > ))
};
</ 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" > Precondition:</ th >< td class = "field-body" > Appears in < tt class = "literal" >< span class = "pre" > fun</ span ></ tt > 's scope, immediately followed by the scope-closing
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bracket (< tt class = "literal" >< span class = "pre" > }</ span ></ tt > ).</ td >
</ tr >
< tr class = "field" >< th class = "field-name" > Return type:</ th >< td class = "field-body" > None.</ td >
</ tr >
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< tr class = "field" >< th class = "field-name" > Semantics:</ th >< td class = "field-body" > Expands to nothing and has no effect on conforming compilers. On compilers that
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don't support partial template specialization or/and template template parameters
expands to an unspecified token sequence enabling < tt class = "literal" >< span class = "pre" > fun</ span ></ tt > to participate in
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< a class = "reference internal" href = "./lambda-expression.html" > Lambda Expression</ a > s with the semantics described in this manual.</ td >
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</ tr >
</ tbody >
</ table >
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< div class = "section" id = "id1389" >
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< h3 >< a class = "subsection-title" href = "#example" name = "example" > Example</ a ></ h3 >
< pre class = "literal-block" >
template< typename T, typename U = int > struct f
{
typedef T type[sizeof(U)];
< a href = "./aux-lambda-support.html" class = "identifier" > BOOST_MPL_AUX_LAMBDA_SUPPORT</ a > (2, f, (T,U))
};
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typedef < a href = "./apply.html" class = "identifier" > apply</ a >< tt class = "literal" >< span class = "pre" > 1</ span ></ tt > < f< char,< a href = "./placeholders.html" class = "identifier" > _1</ a > > ,long > ::type r;
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< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT</ a > (( is_same< r, char[sizeof(long)] > ));
</ pre >
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< div class = "section" id = "id1390" >
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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 = "./macros.html" > Macros</ a > , < a class = "reference internal" href = "./metafunctions.html" > Metafunctions</ a > , < a class = "reference internal" href = "./lambda-expression.html" > Lambda Expression</ a ></ p >
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< table class = "footer" >< tr class = "footer" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./broken-compiler-workarounds.html" class = "navigation-link" > Prev</ a > < a href = "./terminology.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" > Back Along</ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./broken-compiler-workarounds.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 >< 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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