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7<title>The MPL Reference Manual: not_</title>
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11<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./or.html" class="navigation-link">Prev</a>&nbsp;<a href="./bitwise-operations.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./or.html" class="navigation-link">Back</a>&nbsp;Along</span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./logical-operations.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
12<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./metafunctions.html" class="navigation-link">Metafunctions</a> / <a href="./logical-operations.html" class="navigation-link">Logical Operations</a> / <a href="./not.html" class="navigation-link">not_</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="not">
15<h1><a class="toc-backref" href="./logical-operations.html#id478" name="not">not_</a></h1>
16<div class="section" id="logical-not-synopsis">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt; 
20      typename F
21    &gt;
22struct <a href="./not.html" class="identifier">not_</a>
23{
24    typedef <em>unspecified</em> type;
25};
26</pre>
27</div>
28<div class="section" id="logical-not-description">
29<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
30<p>Returns the result of <em>logical not</em> (<tt class="literal"><span class="pre">!</span></tt>) operation on its argument.</p>
31</div>
32<div class="section" id="logical-not-header">
33<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
34<pre class="literal-block">
35#include &lt;<a href="../../../../boost/mpl/not.hpp" class="header">boost/mpl/not.hpp</a>&gt;
36#include &lt;<a href="../../../../boost/mpl/logical.hpp" class="header">boost/mpl/logical.hpp</a>&gt;
37</pre>
38</div>
39<div class="section" id="logical-not-parameters">
40<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
41<table border="1" class="table">
42<colgroup>
43<col width="17%" />
44<col width="30%" />
45<col width="53%" />
46</colgroup>
47<thead valign="bottom">
48<tr><th>Parameter</th>
49<th>Requirement</th>
50<th>Description</th>
51</tr>
52</thead>
53<tbody valign="top">
54<tr><td><tt class="literal"><span class="pre">F</span></tt></td>
55<td>Nullary <a class="reference" href="./metafunction.html">Metafunction</a></td>
56<td>Operation's argument.</td>
57</tr>
58</tbody>
59</table>
60</div>
61<div class="section" id="logical-not-expression-semantics">
62<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
63<p>For arbitrary nullary <a class="reference" href="./metafunction.html">Metafunction</a> <tt class="literal"><span class="pre">f</span></tt>:</p>
64<pre class="literal-block">
65typedef <a href="./not.html" class="identifier">not_</a>&lt;f&gt;::type r;
66</pre>
67<table class="field-list" frame="void" rules="none">
68<col class="field-name" />
69<col class="field-body" />
70<tbody valign="top">
71<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference" href="./integral-constant.html">Integral Constant</a>.</td>
72</tr>
73<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
74<pre class="last literal-block">
75typedef <a href="./bool.html" class="identifier">bool_</a>&lt; (!f::type::value) &gt; r;
76</pre>
77</td>
78</tr>
79</tbody>
80</table>
81<!-- .......................................................................... -->
82<pre class="literal-block">
83typedef <a href="./not.html" class="identifier">not_</a>&lt;f&gt; r;
84</pre>
85<table class="field-list" frame="void" rules="none">
86<col class="field-name" />
87<col class="field-body" />
88<tbody valign="top">
89<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference" href="./integral-constant.html">Integral Constant</a>.</td>
90</tr>
91<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
92<pre class="last literal-block">
93struct r : <a href="./not.html" class="identifier">not_</a>&lt;f&gt;::type {};
94</pre>
95</td>
96</tr>
97</tbody>
98</table>
99</div>
100<div class="section" id="logical-not-example">
101<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
102<pre class="literal-block">
103<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./not.html" class="identifier">not_</a>&lt; true_ &gt; ));
104<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./not.html" class="identifier">not_</a>&lt; false_ > ));
105</pre>
106</div>
107<div class="section" id="logical-not-see-also">
108<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
109<p><a class="reference" href="./metafunctions.html">Metafunctions</a>, <a class="reference" href="./logical-operations.html">Logical Operations</a>, <a class="refentry reference" href="./and.html"><tt class="refentry literal"><span class="pre">and_</span></tt></a>, <a class="refentry reference" href="./or.html"><tt class="refentry literal"><span class="pre">or_</span></tt></a></p>
110<!-- modtime: November 10, 2004 04:37:01 +0000 -->
111</div>
112</div>
113
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