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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="./invocation.html" class="navigation-link">Invocation</a> / <a href="./unpack-args.html" class="navigation-link">unpack_args</a></td>
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14<div class="section" id="unpack-args">
15<h1><a class="toc-backref" href="./invocation.html#id453" name="unpack-args">unpack_args</a></h1>
16<div class="section" id="unpack-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="./unpack-args.html" class="identifier">unpack_args</a>
23{
24    // <em>unspecified</em>
25    // <em>...</em>
26};
27</pre>
28</div>
29<div class="section" id="unpack-description">
30<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
31<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
32an 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>
33</div>
34<div class="section" id="unpack-header">
35<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
36<pre class="literal-block">
37#include &lt;<a href="../../../../boost/mpl/unpack_args.hpp" class="header">boost/mpl/unpack_args.hpp</a>&gt;
38</pre>
39</div>
40<div class="section" id="unpack-model-of">
41<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
42<p><a class="reference" href="./metafunction-class.html">Metafunction Class</a></p>
43</div>
44<div class="section" id="unpack-parameters">
45<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
46<table border="1" class="table">
47<colgroup>
48<col width="19%" />
49<col width="28%" />
50<col width="53%" />
51</colgroup>
52<thead valign="bottom">
53<tr><th>Parameter</th>
54<th>Requirement</th>
55<th>Description</th>
56</tr>
57</thead>
58<tbody valign="top">
59<tr><td><tt class="literal"><span class="pre">F</span></tt></td>
60<td><a class="reference" href="./lambda-expression.html">Lambda Expression</a></td>
61<td>A lambda expression to adopt.</td>
62</tr>
63</tbody>
64</table>
65</div>
66<div class="section" id="unpack-expression-semantics">
67<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
68<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>
69<pre class="literal-block">
70typedef <a href="./unpack-args.html" class="identifier">unpack_args</a>&lt;f&gt; g;
71</pre>
72<table class="field-list" frame="void" rules="none">
73<col class="field-name" />
74<col class="field-body" />
75<tbody valign="top">
76<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>
77</tr>
78<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>
79<pre class="literal-block">
80<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
81</pre>
82<p>is identical to</p>
83<pre class="last literal-block">
84<a href="./apply.html" class="identifier">apply</a>&lt;F,a1,<em>...</em>a<em>n</em>&gt;::type
85</pre>
86</td>
87</tr>
88</tbody>
89</table>
90</div>
91<div class="section" id="unpack-example">
92<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
93<pre class="literal-block">
94<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./apply.html" class="identifier">apply</a>&lt; 
95      <a href="./unpack-args.html" class="identifier">unpack_args</a>&lt; is_same&lt;_1,_2&gt; &gt;
96    , <a href="./vector.html" class="identifier">vector</a>&lt;int,int&gt;
97    > ));
98</pre>
99</div>
100<div class="section" id="unpack-see-also">
101<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
102<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>
103<!-- modtime: November 10, 2004 04:30:56 +0000 -->
104</div>
105</div>
106
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