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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="./invocation.html" class="navigation-link">Invocation</a> / <a href="./unpack-args.html" class="navigation-link">unpack_args</a></td>
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17<div class="section" id="unpack-args">
18<h1><a class="toc-backref" href="./invocation.html#id453" name="unpack-args">unpack_args</a></h1>
19<div class="section" id="unpack-synopsis">
20<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
21<pre class="literal-block">
22template&lt; 
23      typename F
24    &gt;
25struct <a href="./unpack-args.html" class="identifier">unpack_args</a>
26{
27    // <em>unspecified</em>
28    // <em>...</em>
29};
30</pre>
31</div>
32<div class="section" id="unpack-description">
33<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
34<p>A higher-order primitive transforming an <em>n</em>-ary <a class="reference" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">F</span></tt> into
35an unary <a class="reference" href="./metafunction-class.html">Metafunction Class</a> <tt class="literal"><span class="pre">g</span></tt> accepting a single sequence of <em>n</em> arguments.</p>
36</div>
37<div class="section" id="unpack-header">
38<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
39<pre class="literal-block">
40#include &lt;<a href="../../../../boost/mpl/unpack_args.hpp" class="header">boost/mpl/unpack_args.hpp</a>&gt;
41</pre>
42</div>
43<div class="section" id="unpack-model-of">
44<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
45<p><a class="reference" href="./metafunction-class.html">Metafunction Class</a></p>
46</div>
47<div class="section" id="unpack-parameters">
48<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
49<table border="1" class="table">
50<colgroup>
51<col width="19%" />
52<col width="28%" />
53<col width="53%" />
54</colgroup>
55<thead valign="bottom">
56<tr><th>Parameter</th>
57<th>Requirement</th>
58<th>Description</th>
59</tr>
60</thead>
61<tbody valign="top">
62<tr><td><tt class="literal"><span class="pre">F</span></tt></td>
63<td><a class="reference" href="./lambda-expression.html">Lambda Expression</a></td>
64<td>A lambda expression to adopt.</td>
65</tr>
66</tbody>
67</table>
68</div>
69<div class="section" id="unpack-expression-semantics">
70<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
71<p>For an arbitrary <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>
72<pre class="literal-block">
73typedef <a href="./unpack-args.html" class="identifier">unpack_args</a>&lt;f&gt; g;
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="./metafunction-class.html">Metafunction Class</a>.</td>
80</tr>
81<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">g</span></tt> is a unary <a class="reference" href="./metafunction-class.html">Metafunction Class</a> such that</p>
82<pre class="literal-block">
83<a href="./apply-wrap.html" class="identifier">apply_wrap</a><em>n</em>&lt; g, <a href="./vector.html" class="identifier">vector</a>&lt;a1,<em>...</em>a<em>n</em>&gt; &gt;::type
84</pre>
85<p>is identical to</p>
86<pre class="last literal-block">
87<a href="./apply.html" class="identifier">apply</a>&lt;F,a1,<em>...</em>a<em>n</em>&gt;::type
88</pre>
89</td>
90</tr>
91</tbody>
92</table>
93</div>
94<div class="section" id="unpack-example">
95<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
96<pre class="literal-block">
97<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./apply.html" class="identifier">apply</a>&lt; 
98      <a href="./unpack-args.html" class="identifier">unpack_args</a>&lt; is_same&lt;_1,_2&gt; &gt;
99    , <a href="./vector.html" class="identifier">vector</a>&lt;int,int&gt;
100    > ));
101</pre>
102</div>
103<div class="section" id="unpack-see-also">
104<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
105<p><a class="reference" href="./metafunctions.html">Metafunctions</a>, <a class="reference" href="./lambda-expression.html">Lambda Expression</a>, <a class="reference" href="./metafunction-class.html">Metafunction Class</a>, <a class="refentry reference" href="./apply.html"><tt class="refentry literal"><span class="pre">apply</span></tt></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="./bind.html"><tt class="refentry literal"><span class="pre">bind</span></tt></a></p>
106<!-- modtime: November 10, 2004 04:30:56 +0000 -->
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109
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