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<title>Struct template unpack_expr</title>
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<a name="boost.proto.functional.unpack_expr"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Struct template unpack_expr</span></h2>
<p>boost::proto::functional::unpack_expr &#8212; A <a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> equivalent to the
<code class="computeroutput"><a class="link" href="../unpack_expr_id1265992.html" title="Function unpack_expr">proto::unpack_expr()</a></code> function.
</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../../proto/reference.html#header.boost.proto.make_expr_hpp" title="Header &lt;boost/proto/make_expr.hpp&gt;">boost/proto/make_expr.hpp</a>&gt;
</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Tag<span class="special">,</span> <span class="keyword">typename</span> <a class="link" href="../../../Domain.html" title="Concept Domain">Domain</a> <span class="special">=</span> <a class="link" href="../deduce_domain.html" title="Struct deduce_domain">proto::deduce_domain</a><span class="special">&gt;</span>
<span class="keyword">struct</span> <a class="link" href="unpack_expr.html" title="Struct template unpack_expr">unpack_expr</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="../callable.html" title="Struct callable">proto::callable</a> <span class="special">{</span>
<span class="comment">// member classes/structs/unions</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> This<span class="special">,</span> <span class="keyword">typename</span> Sequence<span class="special">&gt;</span>
<span class="keyword">struct</span> <a class="link" href="unpack_expr/result_This_Sequence__id1265003.html" title="Struct template result&lt;This(Sequence)&gt;">result</a><span class="special">&lt;</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">)</span><span class="special">&gt;</span> <span class="special">:</span> <span class="keyword"></span>
<a class="link" href="../result_of/unpack_expr.html" title="Struct template unpack_expr">proto::result_of::unpack_expr</a><span class="special">&lt;</span>
<span class="identifier">Tag</span><span class="special">,</span>
<span class="identifier">Domain</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">remove_reference</span><span class="special">&lt;</span> <span class="identifier">Sequence</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
<span class="special">&gt;</span>
<span class="special">{</span>
<span class="special">}</span><span class="special">;</span>
<span class="comment">// <a class="link" href="unpack_expr.html#id1265042-bb">public member functions</a></span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Sequence<span class="special">&gt;</span>
<span class="keyword">typename</span> <a class="link" href="../result_of/unpack_expr.html" title="Struct template unpack_expr">proto::result_of::unpack_expr</a><span class="special">&lt;</span> <span class="identifier">Tag</span><span class="special">,</span> <span class="identifier">Domain</span><span class="special">,</span> <span class="identifier">Sequence</span> <span class="keyword">const</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="keyword">const</span>
<a class="link" href="unpack_expr.html#id1265047-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id2303121"></a><h2>Description</h2>
<p>
In all cases, <code class="computeroutput">proto::functional::unpack_expr&lt;Tag, Domain&gt;()(seq)</code> is
equivalent to <code class="computeroutput"><a class="link" href="../unpack_expr_id1265992.html" title="Function unpack_expr">proto::unpack_expr()</a>&lt;Tag,
Domain&gt;(seq)</code>.
</p>
<p>
<code class="computeroutput">proto::functional::unpack_expr&lt;Tag&gt;()(seq)</code> is equivalent to
<code class="computeroutput"><a class="link" href="../unpack_expr_id1265992.html" title="Function unpack_expr">proto::unpack_expr()</a>&lt;Tag&gt;(seq)</code>.
</p>
<div class="refsect2">
<a name="id2303174"></a><h3>
<a name="id1265042-bb"></a><code class="computeroutput">unpack_expr</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Sequence<span class="special">&gt;</span>
<span class="keyword">typename</span> <a class="link" href="../result_of/unpack_expr.html" title="Struct template unpack_expr">proto::result_of::unpack_expr</a><span class="special">&lt;</span> <span class="identifier">Tag</span><span class="special">,</span> <span class="identifier">Domain</span><span class="special">,</span> <span class="identifier">Sequence</span> <span class="keyword">const</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="keyword">const</span>
<a name="id1265047-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span> <span class="special">&amp;</span> sequence<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>
Construct an expression node with tag type <code class="computeroutput">Tag</code> and in the
domain <code class="computeroutput">Domain</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">sequence</code></span></p></td>
<td><p>A Fusion Forward Sequence </p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>
<code class="computeroutput"><a class="link" href="../unpack_expr_id1265992.html" title="Function unpack_expr">proto::unpack_expr</a>&lt;Tag, Domain&gt;(sequence)</code>
</p></td>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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