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< title > The MPL Reference Manual: BOOST_MPL_LIMIT_METAFUNCTION_ARITY</ title >
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< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./cfg-no-has-xxx-template.html" class = "navigation-link" > Prev</ a > < a href = "./limit-vector-size.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./cfg-no-has-xxx-template.html" class = "navigation-link" > Back</ a > < a href = "./limit-vector-size.html" class = "navigation-link" > Along</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./configuration.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 >
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< 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 = "./configuration.html" class = "navigation-link" > Configuration</ a > / < a href = "./limit-metafunction-arity.html" class = "navigation-link" > BOOST_MPL_LIMIT_METAFUNCTION_ARITY</ a ></ td >
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< div class = "section" id = "boost-mpl-limit-metafunction-arity" >
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< h1 >< a class = "toc-backref" href = "./configuration.html#id1601" > BOOST_MPL_LIMIT_METAFUNCTION_ARITY</ a ></ h1 >
< div class = "section" id = "id1353" >
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< h3 >< a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis</ a ></ h3 >
< pre class = "literal-block" >
#if !defined(< a href = "./limit-metafunction-arity.html" class = "identifier" > BOOST_MPL_LIMIT_METAFUNCTION_ARITY</ a > )
# define < a href = "./limit-metafunction-arity.html" class = "identifier" > BOOST_MPL_LIMIT_METAFUNCTION_ARITY</ a > \
< em > implementation-defined integral constant</ em > \
/**/
#endif
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< div class = "section" id = "id1354" >
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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 = "./limit-metafunction-arity.html" class = "identifier" > BOOST_MPL_LIMIT_METAFUNCTION_ARITY</ a ></ span ></ tt > is an overridable configuration macro
regulating the maximum supported arity of < a class = "reference internal" href = "./metafunction.html" > metafunctions</ a > and
< a class = "reference internal" href = "./metafunction-class.html" > metafunction classes</ a > . In this implementation of the
library, < tt class = "literal" >< span class = "pre" >< a href = "./limit-metafunction-arity.html" class = "identifier" > BOOST_MPL_LIMIT_METAFUNCTION_ARITY</ a ></ span ></ tt > has a default value of 5. To
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override the default limit, define < tt class = "literal" >< span class = "pre" >< a href = "./limit-metafunction-arity.html" class = "identifier" > BOOST_MPL_LIMIT_METAFUNCTION_ARITY</ a ></ span ></ tt > to
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the desired maximum arity before including any library header.
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[< em > Note:</ em > Overriding will take effect
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< em > only</ em > if the library is configured not to use < a class = "reference internal" href = "./cfg-no-preprocessed-headers.html#boost-mpl-cfg-no-preprocessed" > preprocessed headers</ a > . See
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< a class = "reference internal" href = "./cfg-no-preprocessed-headers.html" > BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</ a > for more information. — < em > end note</ em > ]</ p >
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</ div >
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< div class = "section" id = "id1357" >
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< h3 >< a class = "subsection-title" href = "#example" name = "example" > Example</ a ></ h3 >
< pre class = "literal-block" >
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#define < a href = "./cfg-no-preprocessed-headers.html" class = "identifier" > BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</ a >
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#define < a href = "./limit-metafunction-arity.html" class = "identifier" > BOOST_MPL_LIMIT_METAFUNCTION_ARITY</ a > 2
< tt class = "literal" >< span class = "pre" > #</ span ></ tt > include < boost/mpl/< a href = "./apply.html" class = "identifier" > apply</ a > .hpp>
using namespace boost::mpl;
template< typename T1, typename T2 > struct second
{
typedef T2 type;
};
template< typename T1, typename T2, typename T3 > struct third
{
typedef T3 type;
};
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typedef < a href = "./apply.html" class = "identifier" > apply</ a > < second< < a href = "./placeholders.html" class = "identifier" > _1</ a > ,_2_> ,int,long > ::type r1;
// typedef < a href = "./apply.html" class = "identifier" > apply</ a > < third< < a href = "./placeholders.html" class = "identifier" > _1</ a > ,_2_,< a href = "./placeholders.html" class = "identifier" > _3</ a > > ,int,long,float > ::type r2; // error!
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</ pre >
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< div class = "section" id = "id1358" >
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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 = "./configuration.html" > Configuration</ a > , < a class = "reference internal" href = "./cfg-no-preprocessed-headers.html" > BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</ a ></ p >
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<!-- Macros/Configuration//BOOST_MPL_LIMIT_VECTOR_SIZE |30 -->
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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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