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<div class="section" id="not">
<h1><a class="toc-backref" href="./logical-operations.html#id1552">not_</a></h1>
<div class="section" id="id1082">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
      typename F
    &gt;
struct <a href="./not.html" class="identifier">not_</a>
{
    typedef <em>unspecified</em> type;
};
</pre>
</div>
<div class="section" id="id1083">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Returns the result of <em>logical not</em> (<tt class="literal"><span class="pre">!</span></tt>) operation on its argument.</p>
</div>
<div class="section" id="id1084">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/not.hpp" class="header">boost/mpl/not.hpp</a>&gt;
#include &lt;<a href="../../../../boost/mpl/logical.hpp" class="header">boost/mpl/logical.hpp</a>&gt;
</pre>
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<div class="section" id="id1085">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<tr><th class="head">Parameter</th>
<th class="head">Requirement</th>
<th class="head">Description</th>
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<tr><td><tt class="literal"><span class="pre">F</span></tt></td>
<td>Nullary <a class="reference internal" href="./metafunction.html">Metafunction</a></td>
<td>Operation's argument.</td>
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<div class="section" id="id1086">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>For arbitrary nullary <a class="reference internal" href="./metafunction.html">Metafunction</a> <tt class="literal"><span class="pre">f</span></tt>:</p>
<pre class="literal-block">
typedef <a href="./not.html" class="identifier">not_</a>&lt;f&gt;::type r;
</pre>
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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="./integral-constant.html">Integral Constant</a>.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
<pre class="last literal-block">
typedef <a href="./bool.html" class="identifier">bool_</a>&lt; (!f::type::value) &gt; r;
</pre>
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<pre class="literal-block">
typedef <a href="./not.html" class="identifier">not_</a>&lt;f&gt; r;
</pre>
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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="./integral-constant.html">Integral Constant</a>.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
<pre class="last literal-block">
struct r : <a href="./not.html" class="identifier">not_</a>&lt;f&gt;::type {};
</pre>
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<div class="section" id="id1087">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./not.html" class="identifier">not_</a>&lt; <a href="./bool.html" class="identifier">true_</a> &gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./not.html" class="identifier">not_</a>&lt; <a href="./bool.html" class="identifier">false_</a> > ));
</pre>
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<div class="section" id="id1088">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./logical-operations.html">Logical Operations</a>, <a class="reference internal" href="./and.html">and_</a>, <a class="reference internal" href="./or.html">or_</a></p>
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