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- <title>The MPL Reference Manual: BOOST_MPL_ASSERT_NOT</title>
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- <div class="section" id="boost-mpl-assert-not">
- <h1><a class="toc-backref" href="./asserts.html#id1590">BOOST_MPL_ASSERT_NOT</a></h1>
- <div class="section" id="id1301">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- #define <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>( pred ) \
- <em>unspecified token sequence</em> \
- /**/
- </pre>
- </div>
- <div class="section" id="id1302">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>Generates a compilation error when predicate holds true.</p>
- </div>
- <div class="section" id="id1303">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/assert.hpp" class="header">boost/mpl/assert.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id1304">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="16%" />
- <col width="38%" />
- <col width="46%" />
- </colgroup>
- <thead valign="bottom">
- <tr><th class="head">Parameter</th>
- <th class="head">Requirement</th>
- <th class="head">Description</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><tt class="literal"><span class="pre">pred</span></tt></td>
- <td>Boolean nullary <a class="reference internal" href="./metafunction.html">Metafunction</a></td>
- <td>A predicate to be asserted to be false.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id1305">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <p>For any boolean nullary <a class="reference internal" href="./metafunction.html">Metafunction</a> <tt class="literal"><span class="pre">pred</span></tt>:</p>
- <pre class="literal-block">
- <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( pred ));
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
- <col class="field-body" />
- <tbody valign="top">
- <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">None.</p>
- </td>
- </tr>
- <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">false</span></tt>, otherwise
- has no effect. Note that double parentheses are required even if no commas
- appear in the condition.</p>
- <p>When possible within the compiler's diagnostic capabilities,
- the error message will include the predicate's full type name, and have a
- general form of:</p>
- <pre class="last literal-block">
- <em>...</em> ************boost::mpl::<a href="./not.html" class="identifier">not_</a>< pred >::************ <em>...</em>
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id1306">
- <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
- <pre class="literal-block">
- template< typename T, typename U > struct my
- {
- // ...
- <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( is_same< T,U > ));
- };
- my<void,void> test;
- // In instantiation of `my<void, void>':
- // instantiated from here
- // conversion from `
- // mpl_::failed************boost::mpl::<a href="./not.html" class="identifier">not_</a><boost::is_same<void, void>
- // >::************' to non-scalar type `mpl_::assert<false>' requested
- </pre>
- </div>
- <div class="section" id="id1307">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./asserts.html">Asserts</a>, <a class="reference internal" href="./assert.html">BOOST_MPL_ASSERT</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>
- <!-- Macros/Asserts//BOOST_MPL_ASSERT_RELATION -->
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- <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
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