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7<title>The MPL Reference Manual: negate</title>
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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="./arithmetic-operations.html" class="navigation-link">Arithmetic Operations</a> / <a href="./negate.html" class="navigation-link">negate</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="negate">
15<h1><a class="toc-backref" href="./arithmetic-operations.html#id467" name="negate">negate</a></h1>
16<div class="section" id="negate-synopsis">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt;
20      typename T
21    &gt;
22struct <a href="./negate.html" class="identifier">negate</a>
23{
24    typedef <em>unspecified</em> type;
25};
26</pre>
27</div>
28<div class="section" id="negate-description">
29<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
30<p>Returns the negative (additive inverse) of its argument.</p>
31</div>
32<div class="section" id="negate-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/negate.hpp" class="header">boost/mpl/negate.hpp</a>&gt;
36#include &lt;<a href="../../../../boost/mpl/arithmetic.hpp" class="header">boost/mpl/arithmetic.hpp</a>&gt;
37</pre>
38</div>
39<div class="section" id="negate-model-of">
40<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
41<p><a class="reference" href="./numeric-metafunction.html">Numeric Metafunction</a></p>
42</div>
43<div class="section" id="negate-parameters">
44<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
45<table border="1" class="table">
46<colgroup>
47<col width="17%" />
48<col width="30%" />
49<col width="53%" />
50</colgroup>
51<thead valign="bottom">
52<tr><th>Parameter</th>
53<th>Requirement</th>
54<th>Description</th>
55</tr>
56</thead>
57<tbody valign="top">
58<tr><td><tt class="literal"><span class="pre">T</span></tt></td>
59<td><a class="reference" href="./integral-constant.html">Integral Constant</a></td>
60<td>Operation's argument.</td>
61</tr>
62</tbody>
63</table>
64<p>[<em>Note:</em> The requirements listed in this specification
65are the ones imposed by the default implementation. See <a class="reference" href="./numeric-metafunction.html">Numeric Metafunction</a> concept
66for the details on how to provide an implementation for a user-defined numeric type
67that does not satisfy the <a class="reference" href="./integral-constant.html">Integral Constant</a> requirements. — <em>end note</em>]</p>
68</div>
69<div class="section" id="negate-expression-semantics">
70<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
71<p>For any <a class="reference" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt>:</p>
72<pre class="literal-block">
73typedef <a href="./negate.html" class="identifier">negate</a>&lt;c&gt;::type r;
74</pre>
75<table class="field-list" frame="void" rules="none">
76<col class="field-name" />
77<col class="field-body" />
78<tbody valign="top">
79<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>
80</tr>
81<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
82<pre class="last literal-block">
83typedef <a href="./integral-c.html" class="identifier">integral_c</a>&lt; c::<a href="./value-type.html" class="identifier">value_type</a>, ( -c::value ) &gt; r;
84</pre>
85</td>
86</tr>
87</tbody>
88</table>
89<!-- .......................................................................... -->
90<pre class="literal-block">
91typedef <a href="./negate.html" class="identifier">negate</a>&lt;c&gt; r;
92</pre>
93<table class="field-list" frame="void" rules="none">
94<col class="field-name" />
95<col class="field-body" />
96<tbody valign="top">
97<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>
98</tr>
99<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
100<pre class="last literal-block">
101struct r : <a href="./negate.html" class="identifier">negate</a>&lt;c&gt;::type {};
102</pre>
103</td>
104</tr>
105</tbody>
106</table>
107</div>
108<div class="section" id="negate-complexity">
109<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
110<p>Amortized constant time.</p>
111</div>
112<div class="section" id="negate-example">
113<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
114<pre class="literal-block">
115typedef <a href="./negate.html" class="identifier">negate</a>&lt; <a href="./int.html" class="identifier">int_</a>&lt;-10&gt; &gt;::type r;
116<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( r::value, ==, 10 );
117<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; r::<a href="./value-type.html" class="identifier">value_type</a>, int > ));
118</pre>
119</div>
120<div class="section" id="negate-see-also">
121<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
122<p><a class="reference" href="./arithmetic-operations.html">Arithmetic Operations</a>, <a class="reference" href="./numeric-metafunction.html">Numeric Metafunction</a>, <a class="refentry reference" href="./numeric-cast.html"><tt class="refentry literal"><span class="pre">numeric_cast</span></tt></a>, <a class="refentry reference" href="./plus.html"><tt class="refentry literal"><span class="pre">plus</span></tt></a>, <a class="refentry reference" href="./minus.html"><tt class="refentry literal"><span class="pre">minus</span></tt></a>, <a class="refentry reference" href="./times.html"><tt class="refentry literal"><span class="pre">times</span></tt></a></p>
123<!-- modtime: November 10, 2004 05:04:19 +0000 -->
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