74 lines
6.7 KiB
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74 lines
6.7 KiB
HTML
<?xml version="1.0" encoding="utf-8" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" />
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<title>The MPL Reference Manual: BOOST_MPL_LIMIT_METAFUNCTION_ARITY</title>
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<link rel="stylesheet" href="../style.css" type="text/css" />
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</head>
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<body class="docframe refmanual">
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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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</tr></table><div class="header-separator"></div>
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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>
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<div class="section" id="id1353">
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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-metafunction-arity.html" class="identifier">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a>)
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# define <a href="./limit-metafunction-arity.html" class="identifier">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</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="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
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regulating the maximum supported arity of <a class="reference internal" href="./metafunction.html">metafunctions</a> and
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<a class="reference internal" href="./metafunction-class.html">metafunction classes</a>. In this implementation of the
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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>
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<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
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<tt class="literal"><span class="pre">#</span></tt>include <boost/mpl/<a href="./apply.html" class="identifier">apply</a>.hpp>
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using namespace boost::mpl;
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template< typename T1, typename T2 > struct second
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{
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typedef T2 type;
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};
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template< typename T1, typename T2, typename T3 > struct third
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{
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typedef T3 type;
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};
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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;
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// 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>
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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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</div>
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</div>
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<div class="footer-separator"></div>
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<table class="footer"><tr class="footer"><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><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body>
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