ceph/src/boost/libs/mpl/doc/refmanual/quote.html

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   7 <title>The MPL Reference Manual: quote</title>
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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="./composition-and-argument-binding.html" class="navigation-link">Composition and Argument Binding</a> / <a href="./quote.html" class="navigation-link">quote</a></td>
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  14 <div class="section" id="quote">
  15 <h1><a class="toc-backref" href="./composition-and-argument-binding.html#id1532">quote</a></h1>
  16 <div class="section" id="id938">
  17 <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
  18 <pre class="literal-block">
  19 template&lt;
  20       template&lt; typename P1 &gt; class F
  21     , typename Tag = <em>unspecified</em>
  22     &gt;
  23 struct quote1
  24 {
  25     // <em>unspecified</em>
  26     // <em>...</em>
  27 };
  28
  29 <em>...</em>
  30
  31 template&lt;
  32       template&lt; typename P1,<em>...</em> typename P<em>n</em> &gt; class F
  33     , typename Tag = <em>unspecified</em>
  34     &gt;
  35 struct <a href="./quote.html" class="identifier">quote</a><em>n</em>
  36 {
  37     // <em>unspecified</em>
  38     // <em>...</em>
  39 };
  40 </pre>
  41 </div>
  42 <div class="section" id="id939">
  43 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  44 <p><tt class="literal"><span class="pre"><a href="./quote.html" class="identifier">quote</a></span></tt><em>n</em> is a higher-order primitive that wraps an <em>n</em>-ary <a class="reference internal" href="./metafunction.html">Metafunction</a> to create
  45 a corresponding <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a>.</p>
  46 </div>
  47 <div class="section" id="id940">
  48 <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
  49 <pre class="literal-block">
  50 #include &lt;<a href="../../../../boost/mpl/quote.hpp" class="header">boost/mpl/quote.hpp</a>&gt;
  51 </pre>
  52 </div>
  53 <div class="section" id="id941">
  54 <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
  55 <p><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a></p>
  56 </div>
  57 <div class="section" id="id942">
  58 <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
  59 <table border="1" class="docutils table">
  60 <colgroup>
  61 <col width="18%" />
  62 <col width="27%" />
  63 <col width="55%" />
  64 </colgroup>
  65 <thead valign="bottom">
  66 <tr><th class="head">Parameter</th>
  67 <th class="head">Requirement</th>
  68 <th class="head">Description</th>
  69 </tr>
  70 </thead>
  71 <tbody valign="top">
  72 <tr><td><tt class="literal"><span class="pre">F</span></tt></td>
  73 <td><a class="reference internal" href="./metafunction.html">Metafunction</a></td>
  74 <td>A metafunction to wrap.</td>
  75 </tr>
  76 <tr><td><tt class="literal"><span class="pre">Tag</span></tt></td>
  77 <td>Any type</td>
  78 <td>A tag determining wrap semantics.</td>
  79 </tr>
  80 </tbody>
  81 </table>
  82 </div>
  83 <div class="section" id="id943">
  84 <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
  85 <p>For any <em>n</em>-ary <a class="reference internal" href="./metafunction.html">Metafunction</a> <tt class="literal"><span class="pre">f</span></tt> and arbitrary type <tt class="literal"><span class="pre">tag</span></tt>:</p>
  86 <pre class="literal-block">
  87 typedef <a href="./quote.html" class="identifier">quote</a><em>n</em>&lt;f&gt; g;
  88 typedef <a href="./quote.html" class="identifier">quote</a><em>n</em>&lt;f,tag&gt; g;
  89 </pre>
  90 <table class="docutils field-list" frame="void" rules="none">
  91 <col class="field-name" />
  92 <col class="field-body" />
  93 <tbody valign="top">
  94 <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>
  95 </td>
  96 </tr>
  97 <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
  98 <pre class="literal-block">
  99 struct g
 100 {
 101     template&lt; typename A1,<em>...</em> typename A<em>n</em> &gt; struct <a href="./apply.html" class="identifier">apply</a>
 102         : f&lt;A1,<em>...</em>A<em>n</em>&gt;
 103     {
 104     };
 105 };
 106 </pre>
 107 <p>if <tt class="literal"><span class="pre">f&lt;A1,...An&gt;</span></tt> has a nested type member <tt class="literal"><span class="pre">::type</span></tt>, and to</p>
 108 <pre class="literal-block">
 109 struct g
 110 {
 111     template&lt; typename A1,<em>...</em> typename A<em>n</em> &gt; struct <a href="./apply.html" class="identifier">apply</a>
 112     {
 113         typedef f&lt;A1,<em>...</em>A<em>n</em>&gt; type;
 114     };
 115 };
 116 </pre>
 117 <p class="last">otherwise.</p>
 118 </td>
 119 </tr>
 120 </tbody>
 121 </table>
 122 </div>
 123 <div class="section" id="id944">
 124 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
 125 <pre class="literal-block">
 126 template&lt; typename T &gt; struct f1
 127 {
 128     typedef T type;
 129 };
 130
 131 template&lt;
 132     typename T1, typename T2, typename T3, typename T4, typename T5
 133     &gt;
 134 struct f5
 135 {
 136     // no 'type' member!
 137 };
 138
 139 typedef <a href="./quote.html" class="identifier">quote</a><tt class="literal"><span class="pre">1</span></tt>&lt;f1&gt;::<a href="./apply.html" class="identifier">apply</a>&lt;int&gt;::type t1;
 140 typedef <a href="./quote.html" class="identifier">quote</a><tt class="literal"><span class="pre">5</span></tt>&lt;f5&gt;::<a href="./apply.html" class="identifier">apply</a>&lt;char,short,int,long,float&gt;::type t5;
 141
 142 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; t1, int &gt; ));
 143 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; t5, f5&lt;char,short,int,long,float&gt; > ));
 144 </pre>
 145 </div>
 146 <div class="section" id="id945">
 147 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
 148 <p><a class="reference internal" href="./composition-and-argument-binding.html">Composition and Argument Binding</a>, <a class="reference internal" href="./invocation.html">invocation</a>, <a class="reference internal" href="./bind.html">bind</a>, <a class="reference internal" href="./lambda.html">lambda</a>, <a class="reference internal" href="./protect.html">protect</a>, <a class="reference internal" href="./apply.html">apply</a></p>
 149 <!-- Metafunctions/Composition and Argument Binding//arg |50 -->
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 155 <td><div class="copyright-footer"><div class="copyright">Copyright ©  2001-2009 Aleksey Gurtovoy and David Abrahams</div>
 156 Distributed under the Boost Software License, Version 1.0. (See accompanying
 157 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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