114 lines
6.8 KiB
HTML
114 lines
6.8 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 http-equiv="Content-Type" content="text/html; charset=utf-8" />
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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_ASSERT</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="./asserts.html" class="navigation-link">Prev</a> <a href="./assert-msg.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./assert-msg.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./asserts.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="./asserts.html" class="navigation-link">Asserts</a> / <a href="./assert.html" class="navigation-link">BOOST_MPL_ASSERT</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="boost-mpl-assert">
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<h1><a class="toc-backref" href="./asserts.html#id1588">BOOST_MPL_ASSERT</a></h1>
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<div class="section" id="id1287">
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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="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>( pred ) \
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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="id1288">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<p>Generates a compilation error when the predicate <tt class="literal"><span class="pre">pred</span></tt> holds false.</p>
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</div>
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<div class="section" id="id1289">
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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/assert.hpp" class="header">boost/mpl/assert.hpp</a>>
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</pre>
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</div>
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<div class="section" id="id1290">
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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="43%" />
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<col width="38%" />
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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">pred</span></tt></td>
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<td>Boolean nullary <a class="reference internal" href="./metafunction.html">Metafunction</a></td>
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<td>A predicate to be asserted.</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="id1291">
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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 boolean nullary <a class="reference internal" href="./metafunction.html">Metafunction</a> <tt class="literal"><span class="pre">pred</span></tt>:</p>
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<pre class="literal-block">
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( pred ));
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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">None.</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">Generates a compilation error if <tt class="literal"><span class="pre">pred::type::value</span> <span class="pre">!=</span> <span class="pre">true</span></tt>, otherwise
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has no effect. Note that double parentheses are required even if no commas
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appear in the condition.</p>
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<p>When possible within the compiler's diagnostic capabilities,
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the error message will include the predicate's full type name, and have a
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general form of:</p>
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<pre class="last literal-block">
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<em>...</em> ************ pred::************ <em>...</em>
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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="id1292">
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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 > struct my
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{
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// ...
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< T,U > ));
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};
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my<void*,char*> test;
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// In instantiation of `my<void, char*>':
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// instantiated from here
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// conversion from `
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// mpl_::failed************boost::is_same<void, char*>::************' to
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// non-scalar type `mpl_::assert<false>' requested
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</pre>
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</div>
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<div class="section" id="id1293">
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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="./asserts.html">Asserts</a>, <a class="reference internal" href="./assert-not.html">BOOST_MPL_ASSERT_NOT</a>, <a class="reference internal" href="./assert-msg.html">BOOST_MPL_ASSERT_MSG</a>, <a class="reference internal" href="./assert-relation.html">BOOST_MPL_ASSERT_RELATION</a></p>
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<!-- Macros/Asserts//BOOST_MPL_ASSERT_MSG -->
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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="./asserts.html" class="navigation-link">Prev</a> <a href="./assert-msg.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./assert-msg.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./asserts.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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