113 lines
7.6 KiB
HTML
113 lines
7.6 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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<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" />
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<title>The MPL Reference Manual: unpack_args</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="./apply-wrap.html" class="navigation-link">Prev</a> <a href="./composition-and-argument-binding.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./apply-wrap.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./invocation.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="./metafunctions.html" class="navigation-link">Metafunctions</a> / <a href="./invocation.html" class="navigation-link">Invocation</a> / <a href="./unpack-args.html" class="navigation-link">unpack_args</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="unpack-args">
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<h1><a class="toc-backref" href="./invocation.html#id1527">unpack_args</a></h1>
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<div class="section" id="id901">
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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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template<
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typename F
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>
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struct <a href="./unpack-args.html" class="identifier">unpack_args</a>
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{
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// <em>unspecified</em>
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// <em>...</em>
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};
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</pre>
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</div>
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<div class="section" id="id902">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<p>A higher-order primitive transforming an <em>n</em>-ary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">F</span></tt> into
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an unary <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a> <tt class="literal"><span class="pre">g</span></tt> accepting a single sequence of <em>n</em> arguments.</p>
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</div>
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<div class="section" id="id903">
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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/unpack_args.hpp" class="header">boost/mpl/unpack_args.hpp</a>>
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</pre>
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</div>
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<div class="section" id="id904">
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<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
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<p><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a></p>
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</div>
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<div class="section" id="id905">
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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="19%" />
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<col width="28%" />
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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">F</span></tt></td>
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<td><a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
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<td>A lambda expression to adopt.</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="id906">
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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 an arbitrary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">f</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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typedef <a href="./unpack-args.html" class="identifier">unpack_args</a><f> g;
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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">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a>.</p>
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</td>
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</tr>
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<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">g</span></tt> is a unary <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a> such that</p>
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<pre class="literal-block">
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<a href="./apply-wrap.html" class="identifier">apply_wrap</a><em>n</em>< g, <a href="./vector.html" class="identifier">vector</a><a1,<em>...</em>a<em>n</em>> >::type
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</pre>
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<p>is identical to</p>
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<pre class="last literal-block">
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<a href="./apply.html" class="identifier">apply</a><F,a1,<em>...</em>a<em>n</em>>::type
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</pre>
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</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="id907">
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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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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./apply.html" class="identifier">apply</a><
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<a href="./unpack-args.html" class="identifier">unpack_args</a>< is_same<<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>> >
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, <a href="./vector.html" class="identifier">vector</a><int,int>
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> ));
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</pre>
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</div>
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<div class="section" id="id908">
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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="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a>, <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a>, <a class="reference internal" href="./apply.html">apply</a>, <a class="reference internal" href="./apply-wrap.html">apply_wrap</a>, <a class="reference internal" href="./bind.html">bind</a></p>
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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="./apply-wrap.html" class="navigation-link">Prev</a> <a href="./composition-and-argument-binding.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./apply-wrap.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./invocation.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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