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122 lines
8.0 KiB
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<?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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<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" />
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<title>The MPL Reference Manual: BOOST_MPL_AUX_LAMBDA_SUPPORT</title>
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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="./broken-compiler-workarounds.html" class="navigation-link">Prev</a> <a href="./terminology.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./broken-compiler-workarounds.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="./broken-compiler-workarounds.html" class="navigation-link">Broken Compiler Workarounds</a> / <a href="./aux-lambda-support.html" class="navigation-link">BOOST_MPL_AUX_LAMBDA_SUPPORT</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="boost-mpl-aux-lambda-support">
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<h1><a class="toc-backref" href="./broken-compiler-workarounds.html#id1609">BOOST_MPL_AUX_LAMBDA_SUPPORT</a></h1>
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<div class="section" id="id1384">
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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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#define <a href="./aux-lambda-support.html" class="identifier">BOOST_MPL_AUX_LAMBDA_SUPPORT</a>(arity, fun, params) \
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<em>unspecified token sequence</em> \
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/**/
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</pre>
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</div>
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<div class="section" id="id1385">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<p>Enables metafunction <tt class="literal"><span class="pre">fun</span></tt> for the use in <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a>s on
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compilers that don't support partial template specialization or/and
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template template parameters. Expands to nothing on conforming compilers.</p>
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</div>
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<div class="section" id="id1386">
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<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
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<pre class="literal-block">
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#include <<a href="../../../../boost/mpl/aux_/lambda_support.hpp" class="header">boost/mpl/aux_/lambda_support.hpp</a>>
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</pre>
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</div>
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<div class="section" id="id1387">
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<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<table border="1" class="docutils table">
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<colgroup>
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<col width="15%" />
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<col width="32%" />
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<col width="53%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th class="head">Parameter</th>
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<th class="head">Requirement</th>
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<th class="head">Description</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td><tt class="literal"><span class="pre">arity</span></tt></td>
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<td>An integral constant</td>
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<td>The metafunction's arity, i.e. the number of its
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template parameters, including the defaults.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">fun</span></tt></td>
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<td>A legal identifier token</td>
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<td>The metafunction's name.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">params</span></tt></td>
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<td>A <a class="reference external" href="http://www.boost.org/libs/preprocessor/doc/data/tuples.html" target="_top">PP-tuple</a></td>
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<td>A tuple of the metafunction's parameter names, in
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their original order, including the defaults.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id1388">
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<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
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<p>For any integral constant <tt class="literal"><span class="pre">n</span></tt>, a <a class="reference internal" href="./metafunction.html">Metafunction</a> <tt class="literal"><span class="pre">fun</span></tt>, and arbitrary types <tt class="literal"><span class="pre">A1</span></tt>,... <tt class="literal"><span class="pre">An</span></tt>:</p>
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<pre class="literal-block">
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template< typename A1,<em>...</em> typename A<em>n</em> > struct fun
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{
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// <em>...</em>
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<a href="./aux-lambda-support.html" class="identifier">BOOST_MPL_AUX_LAMBDA_SUPPORT</a>(n, fun, (A1,<em>...</em>A<em>n</em>))
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};
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</pre>
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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field"><th class="field-name">Precondition:</th><td class="field-body">Appears in <tt class="literal"><span class="pre">fun</span></tt>'s scope, immediately followed by the scope-closing
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bracket (<tt class="literal"><span class="pre">}</span></tt>).</td>
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</tr>
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<tr class="field"><th class="field-name">Return type:</th><td class="field-body">None.</td>
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</tr>
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<tr class="field"><th class="field-name">Semantics:</th><td class="field-body">Expands to nothing and has no effect on conforming compilers. On compilers that
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don't support partial template specialization or/and template template parameters
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expands to an unspecified token sequence enabling <tt class="literal"><span class="pre">fun</span></tt> to participate in
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<a class="reference internal" href="./lambda-expression.html">Lambda Expression</a>s with the semantics described in this manual.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id1389">
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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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template< typename T, typename U = int > struct f
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{
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typedef T type[sizeof(U)];
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<a href="./aux-lambda-support.html" class="identifier">BOOST_MPL_AUX_LAMBDA_SUPPORT</a>(2, f, (T,U))
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};
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typedef <a href="./apply.html" class="identifier">apply</a><tt class="literal"><span class="pre">1</span></tt>< f<char,<a href="./placeholders.html" class="identifier">_1</a>>,long >::type r;
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< r, char[sizeof(long)] > ));
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</pre>
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</div>
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<div class="section" id="id1390">
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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="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></p>
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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="./broken-compiler-workarounds.html" class="navigation-link">Prev</a> <a href="./terminology.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./broken-compiler-workarounds.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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