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7<title>The MPL Reference Manual: apply</title>
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11<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./invocation.html" class="navigation-link">Prev</a>&nbsp;<a href="./apply-wrap.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group">Back&nbsp;<a href="./apply-wrap.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./invocation.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="./invocation.html" class="navigation-link">Invocation</a> / <a href="./apply.html" class="navigation-link">apply</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="apply">
15<h1><a class="toc-backref" href="./invocation.html#id451" name="apply">apply</a></h1>
16<div class="section" id="apply-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 apply0
23{
24    typedef <em>unspecified</em> type;
25};
26
27template&lt; 
28      typename F, typename A1
29    &gt;
30struct apply1
31{
32    typedef <em>unspecified</em> type;
33};
34
35<em>...</em>
36
37template&lt; 
38      typename F, typename A1,<em>...</em> typename An
39    &gt;
40struct <a href="./apply.html" class="identifier">apply</a><em>n</em>
41{
42    typedef <em>unspecified</em> type;
43};
44
45template&lt; 
46      typename F
47    , typename A1 = <em>unspecified</em>
48    <em>...</em>
49    , typename An = <em>unspecified</em>
50    &gt;
51struct <a href="./apply.html" class="identifier">apply</a>
52{
53    typedef <em>unspecified</em> type;
54};
55</pre>
56</div>
57<div class="section" id="apply-description">
58<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
59<p>Invokes a <a class="reference" href="./metafunction-class.html">Metafunction Class</a> or a <a class="reference" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">F</span></tt> with arguments <tt class="literal"><span class="pre">A1</span></tt>,... <tt class="literal"><span class="pre">An</span></tt>.</p>
60</div>
61<div class="section" id="apply-header">
62<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
63<pre class="literal-block">
64#include &lt;<a href="../../../../boost/mpl/apply.hpp" class="header">boost/mpl/apply.hpp</a>&gt;
65</pre>
66</div>
67<div class="section" id="apply-parameters">
68<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
69<table border="1" class="table">
70<colgroup>
71<col width="15%" />
72<col width="36%" />
73<col width="48%" />
74</colgroup>
75<thead valign="bottom">
76<tr><th>Parameter</th>
77<th>Requirement</th>
78<th>Description</th>
79</tr>
80</thead>
81<tbody valign="top">
82<tr><td><tt class="literal"><span class="pre">F</span></tt></td>
83<td><a class="reference" href="./lambda-expression.html">Lambda Expression</a></td>
84<td>An expression to invoke.</td>
85</tr>
86<tr><td><tt class="literal"><span class="pre">A1</span></tt>,... <tt class="literal"><span class="pre">An</span></tt></td>
87<td>Any type</td>
88<td>Invocation arguments.</td>
89</tr>
90</tbody>
91</table>
92</div>
93<div class="section" id="apply-expression-semantics">
94<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
95<p>For any <a class="reference" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">f</span></tt> and arbitrary types <tt class="literal"><span class="pre">a1</span></tt>,... <tt class="literal"><span class="pre">an</span></tt>:</p>
96<pre class="literal-block">
97typedef <a href="./apply.html" class="identifier">apply</a><em>n</em>&lt;f,a1,<em>...</em>a<em>n</em>&gt;::type t;
98typedef <a href="./apply.html" class="identifier">apply</a>&lt;f,a1,<em>...</em>a<em>n</em>&gt;::type t;
99</pre>
100<table class="field-list" frame="void" rules="none">
101<col class="field-name" />
102<col class="field-body" />
103<tbody valign="top">
104<tr class="field"><th class="field-name">Return type:</th><td class="field-body">Any type.</td>
105</tr>
106<tr class="field"><th class="field-name">Semantics:</th><td class="field-body">Equivalent to <tt class="literal"><span class="pre">typedef</span> <span class="pre"><a href="./apply-wrap.html" class="identifier">apply_wrap</a></span></tt><em>n</em><tt class="literal"><span class="pre">&lt;</span> <span class="pre"><a href="./lambda.html" class="identifier">lambda</a>&lt;f&gt;::type,a1,...</span> <span class="pre">an&gt;::type</span> <span class="pre">t;</span></tt>.</td>
107</tr>
108</tbody>
109</table>
110</div>
111<div class="section" id="apply-example">
112<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
113<pre class="literal-block">
114template&lt; typename N1, typename N2 &gt; struct int_plus
115    : <a href="./int.html" class="identifier">int_</a>&lt;( N1::value + N2::value )&gt;
116{
117};
118
119typedef <a href="./apply.html" class="identifier">apply</a>&lt; int_plus&lt;_1,_2&gt;, <a href="./int.html" class="identifier">int_</a>&lt;2&gt;, <a href="./int.html" class="identifier">int_</a>&lt;3&gt; &gt;::type r1;
120typedef <a href="./apply.html" class="identifier">apply</a>&lt; <a href="./quote.html" class="identifier">quote</a><tt class="literal"><span class="pre">2</span></tt>&lt;int_plus&gt;, <a href="./int.html" class="identifier">int_</a>&lt;2&gt;, <a href="./int.html" class="identifier">int_</a>&lt;3&gt; &gt;::type r2;
121
122<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( r1::value, ==, 5 );
123<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( r2::value, ==, 5 );
124</pre>
125</div>
126<div class="section" id="apply-see-also">
127<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
128<p><a class="reference" href="./metafunctions.html">Metafunctions</a>, <a class="refentry reference" href="./apply-wrap.html"><tt class="refentry literal"><span class="pre">apply_wrap</span></tt></a>, <a class="refentry reference" href="./lambda.html"><tt class="refentry literal"><span class="pre">lambda</span></tt></a>, <a class="refentry reference" href="./quote.html"><tt class="refentry literal"><span class="pre">quote</span></tt></a>, <a class="refentry reference" href="./bind.html"><tt class="refentry literal"><span class="pre">bind</span></tt></a></p>
129<!-- modtime: November 10, 2004 04:46:13 +0000 -->
130<!-- Metafunctions/Invocation//apply_wrap |20 -->
131</div>
132</div>
133
134<div class="footer-separator"></div>
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