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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-not.html" class="navigation-link">BOOST_MPL_ASSERT_NOT</a></td>
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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 &lt;<a href="../../../../boost/mpl/assert.hpp" class="header">boost/mpl/assert.hpp</a>&gt;
</pre>
</div>
<div class="section" id="id1304">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<col width="38%" />
<col width="46%" />
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<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" />
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<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>&lt; pred >::************ <em>...</em>
</pre>
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</tbody>
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</div>
<div class="section" id="id1306">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
template&lt; typename T, typename U &gt; struct my
{
    // ...
    <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( is_same&lt; T,U &gt; ));
};

my&lt;void,void&gt; test;

// In instantiation of `my&lt;void, void&gt;':
//   instantiated from here
// conversion from `
//   mpl_::failed************boost::mpl::<a href="./not.html" class="identifier">not_</a>&lt;boost::is_same&lt;void, void&gt;
//   &gt;::************' to non-scalar type `mpl_::assert&lt;false&gt;' 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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