53 lines
4.7 KiB
HTML
53 lines
4.7 KiB
HTML
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<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" />
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<title>The MPL Reference Manual: void_</title>
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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="./empty-base.html" class="navigation-link">Prev</a> <a href="./macros.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./empty-base.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./data-types-miscellaneous.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="./data-types.html" class="navigation-link">Data Types</a> / <a href="./data-types-miscellaneous.html" class="navigation-link">Miscellaneous</a> / <a href="./void.html" class="navigation-link">void_</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="void">
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<h1><a class="toc-backref" href="./data-types-miscellaneous.html#id1585">void_</a></h1>
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<div class="section" id="id1280">
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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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struct <a href="./void.html" class="identifier">void_</a>
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{
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typedef <a href="./void.html" class="identifier">void_</a> type;
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};
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template< typename T > struct is_void;
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</pre>
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</div>
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<div class="section" id="id1281">
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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="./void.html" class="identifier">void_</a></span></tt> is a generic type placeholder representing "nothing".</p>
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<!-- In many cases, returning ``void_`` from a metafunction to signal
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an absence of the requested data leads to a simpler user code than
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having a separate metafunction specifically for the purpose of
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performing the corresponding check. -->
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</div>
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<div class="section" id="id1282">
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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/void.hpp" class="header">boost/mpl/void.hpp</a>>
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</pre>
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<div class="section" id="id1283">
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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="./data-types.html">Data Types</a>, <a class="reference internal" href="./pair.html">pair</a>, <a class="reference internal" href="./empty-base.html">empty_base</a>, <a class="reference internal" href="./bool.html">bool_</a>, <a class="reference internal" href="./int.html">int_</a>, <a class="reference internal" href="./integral-c.html">integral_c</a></p>
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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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