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1<?xml version="1.0" encoding="utf-8" ?>
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9<meta name="generator" content="Docutils 0.3.6: http://docutils.sourceforge.net/" />
10<title>The MPL Reference Manual: times</title>
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13<body class="docframe refmanual">
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15<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="./times.html" class="navigation-link">times</a></td>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="times">
18<h1><a class="toc-backref" href="./arithmetic-operations.html#id464" name="times">times</a></h1>
19<div class="section" id="times-synopsis">
20<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
21<pre class="literal-block">
22template&lt;
23      typename T1
24    , typename T2
25    , typename T3 = <em>unspecified</em>
26    <em>...</em>
27    , typename T<em>n</em> = <em>unspecified</em>
28    &gt;
29struct <a href="./times.html" class="identifier">times</a>
30{
31    typedef <em>unspecified</em> type;
32};
33</pre>
34</div>
35<div class="section" id="times-description">
36<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
37<p>Returns the product of its arguments.</p>
38</div>
39<div class="section" id="times-header">
40<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
41<pre class="literal-block">
42#include &lt;<a href="../../../../boost/mpl/times.hpp" class="header">boost/mpl/times.hpp</a>&gt;
43#include &lt;<a href="../../../../boost/mpl/arithmetic.hpp" class="header">boost/mpl/arithmetic.hpp</a>&gt;
44</pre>
45</div>
46<div class="section" id="times-model-of">
47<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
48<p><a class="reference" href="./numeric-metafunction.html">Numeric Metafunction</a></p>
49</div>
50<div class="section" id="times-parameters">
51<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
52<table border="1" class="table">
53<colgroup>
54<col width="17%" />
55<col width="30%" />
56<col width="53%" />
57</colgroup>
58<thead valign="bottom">
59<tr><th>Parameter</th>
60<th>Requirement</th>
61<th>Description</th>
62</tr>
63</thead>
64<tbody valign="top">
65<tr><td><tt class="literal"><span class="pre">T1</span></tt>, <tt class="literal"><span class="pre">T2</span></tt>,... <tt class="literal"><span class="pre">Tn</span></tt></td>
66<td><a class="reference" href="./integral-constant.html">Integral Constant</a></td>
67<td>Operation's arguments.</td>
68</tr>
69</tbody>
70</table>
71<p>[<em>Note:</em> The requirements listed in this specification
72are the ones imposed by the default implementation. See <a class="reference" href="./numeric-metafunction.html">Numeric Metafunction</a> concept
73for the details on how to provide an implementation for a user-defined numeric type
74that does not satisfy the <a class="reference" href="./integral-constant.html">Integral Constant</a> requirements. — <em>end note</em>]</p>
75</div>
76<div class="section" id="times-expression-semantics">
77<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
78<p>For any <a class="reference" href="./integral-constant.html">Integral Constant</a>s <em>c</em><sub>1</sub>,<em>c</em><sub>2</sub>,... <em>c</em><sub>n</sub>:</p>
79<pre class="literal-block">
80typedef <a href="./times.html" class="identifier">times</a>&lt;c1,<em>...</em>c<em>n</em>&gt;::type r;
81</pre>
82<table class="field-list" frame="void" rules="none">
83<col class="field-name" />
84<col class="field-body" />
85<tbody valign="top">
86<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>
87</tr>
88<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
89<pre class="last literal-block">
90typedef <a href="./integral-c.html" class="identifier">integral_c</a>&lt;
91      typeof(c1::value * c2::value)
92    , ( c1::value * c2::value )
93    &gt; c;
94   
95typedef <a href="./times.html" class="identifier">times</a>&lt;c,c3,<em>...</em>c<em>n</em>&gt;::type r;
96</pre>
97</td>
98</tr>
99</tbody>
100</table>
101<!-- .......................................................................... -->
102<pre class="literal-block">
103typedef <a href="./times.html" class="identifier">times</a>&lt;c1,<em>...</em>c<em>n</em>&gt; r;
104</pre>
105<table class="field-list" frame="void" rules="none">
106<col class="field-name" />
107<col class="field-body" />
108<tbody valign="top">
109<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>
110</tr>
111<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
112<pre class="last literal-block">
113struct r : <a href="./times.html" class="identifier">times</a>&lt;c1,<em>...</em>c<em>n</em>&gt;::type {};
114</pre>
115</td>
116</tr>
117</tbody>
118</table>
119</div>
120<div class="section" id="times-complexity">
121<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
122<p>Amortized constant time.</p>
123</div>
124<div class="section" id="times-example">
125<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
126<pre class="literal-block">
127typedef <a href="./times.html" class="identifier">times</a>&lt; <a href="./int.html" class="identifier">int_</a>&lt;-10&gt;, <a href="./int.html" class="identifier">int_</a>&lt;3&gt;, <a href="./long.html" class="identifier">long_</a>&lt;1&gt; &gt;::type r;
128<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( r::value, ==, -30 );
129<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; r::<a href="./value-type.html" class="identifier">value_type</a>, long > ));
130</pre>
131</div>
132<div class="section" id="times-see-also">
133<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
134<p><a class="reference" href="./metafunctions.html">Metafunctions</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="./divides.html"><tt class="refentry literal"><span class="pre">divides</span></tt></a>, <a class="refentry reference" href="./modulus.html"><tt class="refentry literal"><span class="pre">modulus</span></tt></a>, <a class="refentry reference" href="./plus.html"><tt class="refentry literal"><span class="pre">plus</span></tt></a></p>
135<!-- modtime: November 10, 2004 04:31:17 +0000 -->
136<!-- Metafunctions/Arithmetic Operations//divides |40 -->
137</div>
138</div>
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