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1 | <?xml version="1.0" encoding="utf-8" ?> |
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7 | <title>The MPL Reference Manual: unpack_args</title> | |
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10 | <body class="docframe refmanual"> | |
11 | <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./apply-wrap.html" class="navigation-link">Prev</a> <a href="./composition-and-argument-binding.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./apply-wrap.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./invocation.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </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="./unpack-args.html" class="navigation-link">unpack_args</a></td> | |
13 | </tr></table><div class="header-separator"></div> | |
14 | <div class="section" id="unpack-args"> | |
15 | <h1><a class="toc-backref" href="./invocation.html#id1527">unpack_args</a></h1> | |
16 | <div class="section" id="id901"> | |
17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
18 | <pre class="literal-block"> | |
19 | template< | |
20 | typename F | |
21 | > | |
22 | struct <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="id902"> | |
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 internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">F</span></tt> into | |
32 | an unary <a class="reference internal" 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="id903"> | |
35 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
36 | <pre class="literal-block"> | |
37 | #include <<a href="../../../../boost/mpl/unpack_args.hpp" class="header">boost/mpl/unpack_args.hpp</a>> | |
38 | </pre> | |
39 | </div> | |
40 | <div class="section" id="id904"> | |
41 | <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> | |
42 | <p><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a></p> | |
43 | </div> | |
44 | <div class="section" id="id905"> | |
45 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> | |
46 | <table border="1" class="docutils table"> | |
47 | <colgroup> | |
48 | <col width="19%" /> | |
49 | <col width="28%" /> | |
50 | <col width="53%" /> | |
51 | </colgroup> | |
52 | <thead valign="bottom"> | |
53 | <tr><th class="head">Parameter</th> | |
54 | <th class="head">Requirement</th> | |
55 | <th class="head">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 internal" 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="id906"> | |
67 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
68 | <p>For an arbitrary <a class="reference internal" 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"> | |
70 | typedef <a href="./unpack-args.html" class="identifier">unpack_args</a><f> g; | |
71 | </pre> | |
72 | <table class="docutils 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"><p class="first"><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a>.</p> | |
77 | </td> | |
78 | </tr> | |
79 | <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 internal" href="./metafunction-class.html">Metafunction Class</a> such that</p> | |
80 | <pre class="literal-block"> | |
81 | <a href="./apply-wrap.html" class="identifier">apply_wrap</a><em>n</em>< g, <a href="./vector.html" class="identifier">vector</a><a1,<em>...</em>a<em>n</em>> >::type | |
82 | </pre> | |
83 | <p>is identical to</p> | |
84 | <pre class="last literal-block"> | |
85 | <a href="./apply.html" class="identifier">apply</a><F,a1,<em>...</em>a<em>n</em>>::type | |
86 | </pre> | |
87 | </td> | |
88 | </tr> | |
89 | </tbody> | |
90 | </table> | |
91 | </div> | |
92 | <div class="section" id="id907"> | |
93 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
94 | <pre class="literal-block"> | |
95 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./apply.html" class="identifier">apply</a>< | |
96 | <a href="./unpack-args.html" class="identifier">unpack_args</a>< is_same<<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>> > | |
97 | , <a href="./vector.html" class="identifier">vector</a><int,int> | |
98 | > )); | |
99 | </pre> | |
100 | </div> | |
101 | <div class="section" id="id908"> | |
102 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
103 | <p><a class="reference internal" href="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a>, <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a>, <a class="reference internal" href="./apply.html">apply</a>, <a class="reference internal" href="./apply-wrap.html">apply_wrap</a>, <a class="reference internal" href="./bind.html">bind</a></p> | |
104 | </div> | |
105 | </div> | |
106 | ||
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108 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./apply-wrap.html" class="navigation-link">Prev</a> <a href="./composition-and-argument-binding.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./apply-wrap.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./invocation.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> | |
109 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
110 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
111 | file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body> | |
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