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1 | <?xml version="1.0" encoding="utf-8" ?> |
2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> | |
3 | <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> | |
4 | <head> | |
5 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> | |
6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
7 | <title>The MPL Reference Manual: Metafunction Class</title> | |
8 | <link rel="stylesheet" href="../style.css" type="text/css" /> | |
9 | </head> | |
10 | <body class="docframe refmanual"> | |
11 | <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./metafunction.html" class="navigation-link">Prev</a> <a href="./lambda-expression.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./metafunction.html" class="navigation-link">Back</a> <a href="./lambda-expression.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./metafunctions-concepts.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="./metafunctions-concepts.html" class="navigation-link">Concepts</a> / <a href="./metafunction-class.html" class="navigation-link">Metafunction Class</a></td> | |
13 | </tr></table><div class="header-separator"></div> | |
14 | <div class="section" id="metafunction-class"> | |
15 | <h1><a class="toc-backref" href="./metafunctions-concepts.html#id1513">Metafunction Class</a></h1> | |
16 | <div class="section" id="summary"> | |
17 | <h3>Summary</h3> | |
18 | <p>A <em>metafunction class</em> is a certain form of metafunction representation | |
19 | that enables higher-order metaprogramming. More precisely, it's a class | |
20 | with a publicly-accessible nested <a class="reference internal" href="./metafunction.html">Metafunction</a> called <tt class="literal"><span class="pre"><a href="./apply.html" class="identifier">apply</a></span></tt>. | |
21 | Correspondingly, a metafunction class invocation is defined as invocation | |
22 | of its nested <tt class="literal"><span class="pre"><a href="./apply.html" class="identifier">apply</a></span></tt> metafunction.</p> | |
23 | </div> | |
24 | <div class="section" id="id827"> | |
25 | <h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3> | |
26 | <p>In the following table and subsequent specifications, <tt class="literal"><span class="pre">f</span></tt> is a <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a>.</p> | |
27 | <table border="1" class="docutils table"> | |
28 | <colgroup> | |
29 | <col width="36%" /> | |
30 | <col width="32%" /> | |
31 | <col width="32%" /> | |
32 | </colgroup> | |
33 | <thead valign="bottom"> | |
34 | <tr><th class="head">Expression</th> | |
35 | <th class="head">Type</th> | |
36 | <th class="head">Complexity</th> | |
37 | </tr> | |
38 | </thead> | |
39 | <tbody valign="top"> | |
40 | <tr><td><tt class="literal"><span class="pre">f::<a href="./apply.html" class="identifier">apply</a>::type</span></tt></td> | |
41 | <td>Any type</td> | |
42 | <td>Unspecified.</td> | |
43 | </tr> | |
44 | <tr><td><tt class="literal"><span class="pre">f::<a href="./apply.html" class="identifier">apply</a><>::type</span></tt></td> | |
45 | <td>Any type</td> | |
46 | <td>Unspecified.</td> | |
47 | </tr> | |
48 | <tr><td><tt class="literal"><span class="pre">f::<a href="./apply.html" class="identifier">apply</a><a1,...an>::type</span></tt></td> | |
49 | <td>Any type</td> | |
50 | <td>Unspecified.</td> | |
51 | </tr> | |
52 | </tbody> | |
53 | </table> | |
54 | </div> | |
55 | <div class="section" id="id828"> | |
56 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
57 | <pre class="literal-block"> | |
58 | typedef f::<a href="./apply.html" class="identifier">apply</a>::type x; | |
59 | </pre> | |
60 | <table class="docutils field-list" frame="void" rules="none"> | |
61 | <col class="field-name" /> | |
62 | <col class="field-body" /> | |
63 | <tbody valign="top"> | |
64 | <tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><tt class="literal"><span class="pre">f</span></tt> is a nullary <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a>; <tt class="literal"><span class="pre">f::<a href="./apply.html" class="identifier">apply</a>::type</span></tt> is a <em>type-name</em>.</td> | |
65 | </tr> | |
66 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">x</span></tt> is the result of the metafunction class invocation.</td> | |
67 | </tr> | |
68 | </tbody> | |
69 | </table> | |
70 | <!-- ................................................................................... --> | |
71 | <pre class="literal-block"> | |
72 | typedef f::<a href="./apply.html" class="identifier">apply</a><>::type x; | |
73 | </pre> | |
74 | <table class="docutils field-list" frame="void" rules="none"> | |
75 | <col class="field-name" /> | |
76 | <col class="field-body" /> | |
77 | <tbody valign="top"> | |
78 | <tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><tt class="literal"><span class="pre">f</span></tt> is a nullary <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a>; <tt class="literal"><span class="pre">f::<a href="./apply.html" class="identifier">apply</a><>::type</span></tt> is a <em>type-name</em>.</td> | |
79 | </tr> | |
80 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">x</span></tt> is the result of the metafunction class invocation.</td> | |
81 | </tr> | |
82 | </tbody> | |
83 | </table> | |
84 | <!-- ................................................................................... --> | |
85 | <pre class="literal-block"> | |
86 | typedef f::<a href="./apply.html" class="identifier">apply</a><a1,<em>...</em>a<em>n</em>>::type x; | |
87 | </pre> | |
88 | <table class="docutils field-list" frame="void" rules="none"> | |
89 | <col class="field-name" /> | |
90 | <col class="field-body" /> | |
91 | <tbody valign="top"> | |
92 | <tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><tt class="literal"><span class="pre">f</span></tt> is an <em>n</em>-ary metafunction class; <tt class="literal"><span class="pre"><a href="./apply.html" class="identifier">apply</a></span></tt> is a <a class="reference internal" href="./metafunction.html">Metafunction</a>.</td> | |
93 | </tr> | |
94 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">x</span></tt> is the result of the metafunction class | |
95 | invocation with the actual arguments <tt class="literal"><span class="pre">a1</span></tt>,... <tt class="literal"><span class="pre">an</span></tt>.</td> | |
96 | </tr> | |
97 | </tbody> | |
98 | </table> | |
99 | </div> | |
100 | <div class="section" id="id829"> | |
101 | <h3><a class="subsection-title" href="#models" name="models">Models</a></h3> | |
102 | <ul class="simple"> | |
103 | <li><a class="reference internal" href="./always.html">always</a></li> | |
104 | <li><a class="reference internal" href="./arg.html">arg</a></li> | |
105 | <li><a class="reference internal" href="./quote.html">quote</a></li> | |
106 | <li><a class="reference internal" href="./numeric-cast.html">numeric_cast</a></li> | |
107 | <li><a class="reference internal" href="./unpack-args.html">unpack_args</a></li> | |
108 | </ul> | |
109 | </div> | |
110 | <div class="section" id="id830"> | |
111 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
112 | <p><a class="reference internal" href="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./metafunction.html">Metafunction</a>, <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a>, <a class="reference internal" href="./invocation.html">invocation</a>, <a class="reference internal" href="./apply-wrap.html">apply_wrap</a>, <a class="reference internal" href="./bind.html">bind</a>, <a class="reference internal" href="./quote.html">quote</a></p> | |
113 | <!-- Metafunctions/Concepts//Lambda Expression |30 --> | |
114 | </div> | |
115 | </div> | |
116 | ||
117 | <div class="footer-separator"></div> | |
118 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./metafunction.html" class="navigation-link">Prev</a> <a href="./lambda-expression.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./metafunction.html" class="navigation-link">Back</a> <a href="./lambda-expression.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./metafunctions-concepts.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> | |
119 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
120 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
121 | 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> | |
122 | </html> |