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7<title>The MPL Reference Manual: quote</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="./bind.html" class="navigation-link">Prev</a>&nbsp;<a href="./arg.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./bind.html" class="navigation-link">Back</a>&nbsp;<a href="./arg.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./composition-and-argument-binding.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</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="./composition-and-argument-binding.html" class="navigation-link">Composition and Argument Binding</a> / <a href="./quote.html" class="navigation-link">quote</a></td>
13</tr></table><div class="header-separator"></div>
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">
19template&lt;
20 template&lt; typename P1 &gt; class F
21 , typename Tag = <em>unspecified</em>
22 &gt;
23struct quote1
24{
25 // <em>unspecified</em>
26 // <em>...</em>
27};
28
29<em>...</em>
30
31template&lt;
32 template&lt; typename P1,<em>...</em> typename P<em>n</em> &gt; class F
33 , typename Tag = <em>unspecified</em>
34 &gt;
35struct <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
45a 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">
87typedef <a href="./quote.html" class="identifier">quote</a><em>n</em>&lt;f&gt; g;
88typedef <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">
99struct 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">
109struct 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">
126template&lt; typename T &gt; struct f1
127{
128 typedef T type;
129};
130
131template&lt;
132 typename T1, typename T2, typename T3, typename T4, typename T5
133 &gt;
134struct f5
135{
136 // no 'type' member!
137};
138
139typedef <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;
140typedef <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 -->
150</div>
151</div>
152
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155<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
156Distributed under the Boost Software License, Version 1.0. (See accompanying
157file 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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