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<div class="section" id="apply">
<h1><a class="toc-backref" href="./invocation.html#id1525">apply</a></h1>
<div class="section" id="id887">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
      typename F
    &gt;
struct apply0
{
    typedef <em>unspecified</em> type;
};

template&lt;
      typename F, typename A1
    &gt;
struct apply1
{
    typedef <em>unspecified</em> type;
};

<em>...</em>

template&lt;
      typename F, typename A1,<em>...</em> typename An
    &gt;
struct <a href="./apply.html" class="identifier">apply</a><em>n</em>
{
    typedef <em>unspecified</em> type;
};

template&lt;
      typename F
    , typename A1 = <em>unspecified</em>
    <em>...</em>
    , typename An = <em>unspecified</em>
    &gt;
struct <a href="./apply.html" class="identifier">apply</a>
{
    typedef <em>unspecified</em> type;
};
</pre>
</div>
<div class="section" id="id888">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Invokes a <a class="reference internal" href="./metafunction-class.html">Metafunction Class</a> or a <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">F</span></tt> with arguments <tt class="literal"><span class="pre">A1</span></tt>,... <tt class="literal"><span class="pre">An</span></tt>.</p>
</div>
<div class="section" id="id889">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/apply.hpp" class="header">boost/mpl/apply.hpp</a>&gt;
</pre>
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<div class="section" id="id890">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<col width="36%" />
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<tr><th class="head">Parameter</th>
<th class="head">Requirement</th>
<th class="head">Description</th>
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<tr><td><tt class="literal"><span class="pre">F</span></tt></td>
<td><a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
<td>An expression to invoke.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">A1</span></tt>,... <tt class="literal"><span class="pre">An</span></tt></td>
<td>Any type</td>
<td>Invocation arguments.</td>
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<div class="section" id="id891">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>For any <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>
<pre class="literal-block">
typedef <a href="./apply.html" class="identifier">apply</a><em>n</em>&lt;f,a1,<em>...</em>a<em>n</em>&gt;::type t;
typedef <a href="./apply.html" class="identifier">apply</a>&lt;f,a1,<em>...</em>a<em>n</em>&gt;::type t;
</pre>
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<tr class="field"><th class="field-name">Return type:</th><td class="field-body">Any type.</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body">Equivalent to <tt class="literal"><span class="pre">typedef</span> <span class="pre"><a href="./apply-wrap.html" class="identifier">apply_wrap</a></span></tt><em>n</em><tt class="literal"><span class="pre">&lt;</span> <span class="pre"><a href="./lambda.html" class="identifier">lambda</a>&lt;f&gt;::type,a1,...</span> <span class="pre">an&gt;::type</span> <span class="pre">t;</span></tt>.</td>
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<div class="section" id="id892">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
template&lt; typename N1, typename N2 &gt; struct int_plus
    : <a href="./int.html" class="identifier">int_</a>&lt;( N1::value + N2::value )&gt;
{
};

typedef <a href="./apply.html" class="identifier">apply</a>&lt; int_plus&lt;<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>&gt;, <a href="./int.html" class="identifier">int_</a>&lt;2&gt;, <a href="./int.html" class="identifier">int_</a>&lt;3&gt; &gt;::type r1;
typedef <a href="./apply.html" class="identifier">apply</a>&lt; <a href="./quote.html" class="identifier">quote</a><tt class="literal"><span class="pre">2</span></tt>&lt;int_plus&gt;, <a href="./int.html" class="identifier">int_</a>&lt;2&gt;, <a href="./int.html" class="identifier">int_</a>&lt;3&gt; &gt;::type r2;

<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( r1::value, ==, 5 );
<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( r2::value, ==, 5 );
</pre>
</div>
<div class="section" id="id893">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./apply-wrap.html">apply_wrap</a>, <a class="reference internal" href="./lambda.html">lambda</a>, <a class="reference internal" href="./quote.html">quote</a>, <a class="reference internal" href="./bind.html">bind</a></p>
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