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<!-- Copyright Aleksey Gurtovoy 2006. Distributed under the Boost -->
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<title>The MPL Reference Manual: BOOST_MPL_LIMIT_MAP_SIZE</title>
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<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./limit-set-size.html" class="navigation-link">Prev</a> <a href="./limit-unrolling.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./limit-set-size.html" class="navigation-link">Back</a> <a href="./limit-unrolling.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-map-size.html" class="navigation-link">BOOST_MPL_LIMIT_MAP_SIZE</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="limit-map-size">
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<h1><a class="toc-backref" href="./configuration.html#id525" name="limit-map-size">BOOST_MPL_LIMIT_MAP_SIZE</a></h1>
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<div class="section" id="id305">
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<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
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<pre class="literal-block">
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#if !defined(<a href="./limit-map-size.html" class="identifier">BOOST_MPL_LIMIT_MAP_SIZE</a>)
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# define <a href="./limit-map-size.html" class="identifier">BOOST_MPL_LIMIT_MAP_SIZE</a> \
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<em>implementation-defined integral constant</em> \
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/**/
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#endif
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</pre>
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</div>
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<div class="section" id="id306">
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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-map-size.html" class="identifier">BOOST_MPL_LIMIT_MAP_SIZE</a></span></tt> is an overridable configuration macro regulating
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the maximum arity of the <tt class="literal"><span class="pre"><a href="./map.html" class="identifier">map</a></span></tt>'s <a class="reference" href="./variadic-sequence.html">variadic form</a>. In this
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implementation of the library, <tt class="literal"><span class="pre"><a href="./limit-map-size.html" class="identifier">BOOST_MPL_LIMIT_MAP_SIZE</a></span></tt> has a default value
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of 20. To override the default limit, define <tt class="literal"><span class="pre"><a href="./limit-map-size.html" class="identifier">BOOST_MPL_LIMIT_MAP_SIZE</a></span></tt> to
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the desired maximum arity rounded up to the nearest multiple of ten before
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including any library header. [<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" href="./cfg-no-preprocessed.html">preprocessed headers</a>. See
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<a class="refentry reference" href="./cfg-no-preprocessed.html"><tt class="refentry literal"><span class="pre">BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</span></tt></a> for more information. — <em>end note</em>]</p>
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</div>
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<div class="section" id="id308">
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<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
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<pre class="literal-block">
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#define <a href="./cfg-no-preprocessed.html" class="identifier">BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</a>
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#define <a href="./limit-map-size.html" class="identifier">BOOST_MPL_LIMIT_MAP_SIZE</a> 10
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<tt class="literal"><span class="pre">#</span></tt>include <boost/mpl/<a href="./map.html" class="identifier">map</a>.hpp>
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<tt class="literal"><span class="pre">#</span></tt>include <boost/mpl/<a href="./pair.html" class="identifier">pair</a>.hpp>
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<tt class="literal"><span class="pre">#</span></tt>include <boost/mpl/int.hpp>
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using namespace boost::mpl;
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template< int i > struct ints : <a href="./pair.html" class="identifier">pair</a>< <a href="./int.html" class="identifier">int_</a><i>,<a href="./int.html" class="identifier">int_</a><i> > {};
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typedef <a href="./map.html" class="identifier">map</a>< ints<1> > m_1;
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typedef <a href="./map.html" class="identifier">map</a>< ints<1>, ints<2>, ints<3>, ints<4>, ints<5>
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ints<6>, ints<7>, ints<8>, ints<9>, ints<10> > m_10;
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// typedef <a href="./map.html" class="identifier">map</a>< ints<1>, ints<2>, ints<3>, ints<4>, ints<5>
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// ints<6>, ints<7>, ints<8>, ints<9>, ints<10>, ints<11> > m_11; // error!
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</pre>
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</div>
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<div class="section" id="id309">
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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" href="./configuration.html">Configuration</a>, <a class="refentry reference" href="./cfg-no-preprocessed.html"><tt class="refentry literal"><span class="pre">BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</span></tt></a>, <a class="refentry reference" href="./limit-set-size.html"><tt class="refentry literal"><span class="pre">BOOST_MPL_LIMIT_SET_SIZE</span></tt></a></p>
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