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- <title>The MPL Reference Manual: BOOST_MPL_LIMIT_METAFUNCTION_ARITY</title>
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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>
- </div>
- <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>
- </div>
- <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 <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;
- };
- 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!
- </pre>
- </div>
- <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 -->
- </div>
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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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