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<div class="refentry" title="Struct template impl">
<a name="boost.proto._child_c.impl"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Struct template impl</span></h2>
<p>boost::proto::_child_c::impl</p>
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<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="emphasis"><em>// In header: <<a class="link" href="../../../proto/reference.html#header.boost.proto.transform.arg_hpp" title="Header <boost/proto/transform/arg.hpp>">boost/proto/transform/arg.hpp</a>>
</em></span>
<span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Expr, <span class="bold"><strong>typename</strong></span> State, <span class="bold"><strong>typename</strong></span> Data>
<span class="bold"><strong>struct</strong></span> <a class="link" href="impl.html" title="Struct template impl">impl</a> : <span class="bold"><strong></strong></span> <a class="link" href="../transform_impl.html" title="Struct template transform_impl">proto::transform_impl</a>< Expr, State, Data > {
<span class="emphasis"><em>// types</em></span>
<span class="bold"><strong>typedef</strong></span> <span class="bold"><strong>typename</strong></span> <a class="link" href="../result_of/child_c.html" title="Struct template child_c">proto::result_of::child_c</a>< Expr, N >::type <a name="boost.proto._child_c.impl.result_type"></a>result_type;
<span class="emphasis"><em>// <a class="link" href="impl.html#id1266289-bb">public member functions</a></em></span>
<span class="type"><span class="bold"><strong>typename</strong></span> <a class="link" href="../result_of/child_c.html" title="Struct template child_c">proto::result_of::child_c</a>< Expr, N >::type</span>
<a class="link" href="impl.html#id1266294-bb"><span class="bold"><strong>operator</strong></span>()</a>(<span class="bold"><strong>typename</strong></span> impl::expr_param, <span class="bold"><strong>typename</strong></span> impl::state_param,
<span class="bold"><strong>typename</strong></span> impl::data_param) <span class="bold"><strong>const</strong></span>;
};</pre></div>
<div class="refsect1" title="Description">
<a name="id1664009"></a><h2>Description</h2>
<div class="refsect2" title="impl public member functions">
<a name="id1664013"></a><h3>
<a name="id1266289-bb"></a><code class="computeroutput">impl</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="type"><span class="bold"><strong>typename</strong></span> <a class="link" href="../result_of/child_c.html" title="Struct template child_c">proto::result_of::child_c</a>< Expr, N >::type</span>
<a name="id1266294-bb"></a><span class="bold"><strong>operator</strong></span>()(<span class="bold"><strong>typename</strong></span> impl::expr_param expr, <span class="bold"><strong>typename</strong></span> impl::state_param,
<span class="bold"><strong>typename</strong></span> impl::data_param) <span class="bold"><strong>const</strong></span>;</pre>
<p>
Returns the N-th child of <code class="computeroutput">expr</code>
</p>
<div class="variablelist"><table border="0">
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<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">expr</code></span></p></td>
<td><p>The current expression. </p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>
<code class="computeroutput">Expr::proto_arity::value > N</code>
</p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>
<code class="computeroutput"><a class="link" href="../child_c_id1265156.html" title="Function child_c">proto::child_c</a><N>(expr)</code>
</p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw.</td>
</tr>
</tbody>
</table></div>
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<td align="right"><div class="copyright-footer">Copyright © 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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