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<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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<div class="section" id="quote">
<h1><a class="toc-backref" href="./composition-and-argument-binding.html#id1532">quote</a></h1>
<div class="section" id="id938">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
      template&lt; typename P1 &gt; class F
    , typename Tag = <em>unspecified</em>
    &gt;
struct quote1
{
    // <em>unspecified</em>
    // <em>...</em>
};

<em>...</em>

template&lt;
      template&lt; typename P1,<em>...</em> typename P<em>n</em> &gt; class F
    , typename Tag = <em>unspecified</em>
    &gt;
struct <a href="./quote.html" class="identifier">quote</a><em>n</em>
{
    // <em>unspecified</em>
    // <em>...</em>
};
</pre>
</div>
<div class="section" id="id939">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<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
a corresponding <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a>.</p>
</div>
<div class="section" id="id940">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/quote.hpp" class="header">boost/mpl/quote.hpp</a>&gt;
</pre>
</div>
<div class="section" id="id941">
<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
<p><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a></p>
</div>
<div class="section" id="id942">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<col width="18%" />
<col width="27%" />
<col width="55%" />
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<tr><th class="head">Parameter</th>
<th class="head">Requirement</th>
<th class="head">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="literal"><span class="pre">F</span></tt></td>
<td><a class="reference internal" href="./metafunction.html">Metafunction</a></td>
<td>A metafunction to wrap.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">Tag</span></tt></td>
<td>Any type</td>
<td>A tag determining wrap semantics.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="id943">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<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>
<pre class="literal-block">
typedef <a href="./quote.html" class="identifier">quote</a><em>n</em>&lt;f&gt; g;
typedef <a href="./quote.html" class="identifier">quote</a><em>n</em>&lt;f,tag&gt; g;
</pre>
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<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<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>
</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
<pre class="literal-block">
struct g
{
    template&lt; typename A1,<em>...</em> typename A<em>n</em> &gt; struct <a href="./apply.html" class="identifier">apply</a>
        : f&lt;A1,<em>...</em>A<em>n</em>&gt;
    {
    };
};
</pre>
<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>
<pre class="literal-block">
struct g
{
    template&lt; typename A1,<em>...</em> typename A<em>n</em> &gt; struct <a href="./apply.html" class="identifier">apply</a>
    {
        typedef f&lt;A1,<em>...</em>A<em>n</em>&gt; type;
    };
};
</pre>
<p class="last">otherwise.</p>
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<div class="section" id="id944">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
template&lt; typename T &gt; struct f1
{
    typedef T type;
};

template&lt;
    typename T1, typename T2, typename T3, typename T4, typename T5
    &gt;
struct f5
{
    // no 'type' member!
};

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;
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;

<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; t1, int &gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; t5, f5&lt;char,short,int,long,float&gt; > ));
</pre>
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<div class="section" id="id945">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<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>
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