boost_mpl/doc/ref/Reference/not.html

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<h1><a href="../Table_of_Contents.html"><img src="../mpl_logo.jpg" alt="[Home]" border=0 align="right"></a>not_</h1><h3>Synopsis</h3>
<p>
<pre>
template&lt; 
      typename F
    &gt;
struct not_
{
    typedef <em>unspecified</em> type;
};
</pre>
<p>
<h3>Description</h3>
<p>
Returns the result of <em>logical not</em> (<code>!</code>) operation on its argument.
<p>
<h3>Definition</h3>
<p>
<pre>
#include "<a href="../../../../../boost/mpl/not.hpp">boost/mpl/not.hpp</a>"
</pre>
<p>
<h3>Parameters</h3>
<table border="1">
<tr><th>&nbsp;Parameter&nbsp;</th><th>&nbsp;Requirement&nbsp;</th><th>&nbsp;Description &nbsp;</th></tr>
<tr><td><code>F</code></td><td>A model of nullary <a href="../Metafunction.html">Metafunction</a></td><td></td></tr>
</table>
<p>
<h3>Expression semantics</h3>
<p>
<table border="1">
<tr><th>&nbsp;Expression&nbsp;</th><th>&nbsp;Expression&nbsp;type&nbsp;</th><th>&nbsp;Precondition&nbsp;</th><th>&nbsp;Semantics&nbsp;</th><th>&nbsp;Postcondition&nbsp;</th></tr>
<tr><td><code>not_&lt;f&gt;</code></td><td>A model of <code>bool</code> <a href="../Integral_Constant.html">Integral Constant</a></td><td></td><td>Equivalent to <code>bool_&lt;(!f::type::value)&gt;</code></td><td></td></tr>
</table>
<p>
<h3>Example</h3>
<p>
<pre>
BOOST_STATIC_ASSERT(not_&lt;true_&gt;::value == false);
BOOST_STATIC_ASSERT(not_&lt;false_&gt;::value == true);
</pre>
<p>
<h3>See also</h3>
<p>
<a href="../Metafunctions.html">Metafunctions</a>, <code><a href="../Reference/and.html">and_</a></code>, <code><a href="../Reference/or.html">or_</a></code>
<p><hr>
<a href="../Table_of_Contents.html">Table of Contents</a><br>Last edited September 6, 2003 3:09 am</body></html>