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<div class="section" id="boost-mpl-limit-metafunction-arity">
<h1><a class="toc-backref" href="./configuration.html#id1601">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a></h1>
<div class="section" id="id1353">
<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
</pre>
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<div class="section" id="id1354">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<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
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
the desired maximum arity before including any library header.
[<em>Note:</em> Overriding will take effect
<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
<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 class="section" id="id1357">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
#define <a href="./cfg-no-preprocessed-headers.html" class="identifier">BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</a>
#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 &lt;boost/mpl/<a href="./apply.html" class="identifier">apply</a>.hpp&gt;

using namespace boost::mpl;

template&lt; typename T1, typename T2 &gt; struct second
{
    typedef T2 type;
};

template&lt; typename T1, typename T2, typename T3 &gt; struct third
{
    typedef T3 type;
};

typedef <a href="./apply.html" class="identifier">apply</a>&lt; second&lt;<a href="./placeholders.html" class="identifier">_1</a>,_2_&gt;,int,long &gt;::type r1;
// typedef <a href="./apply.html" class="identifier">apply</a>&lt; third&lt;<a href="./placeholders.html" class="identifier">_1</a>,_2_,<a href="./placeholders.html" class="identifier">_3</a>&gt;,int,long,float &gt;::type r2; // error!
</pre>
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<div class="section" id="id1358">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<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>
<!-- Macros/Configuration//BOOST_MPL_LIMIT_VECTOR_SIZE |30 -->
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