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  25 <div class="refentry">
  26 <a name="boost.proto._child_c.impl"></a><div class="titlepage"></div>
  27 <div class="refnamediv">
  28 <h2><span class="refentrytitle">Struct template impl</span></h2>
  29 <p>boost::proto::_child_c::impl</p>
  30 </div>
  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <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.transform.arg_hpp" title="Header &lt;boost/proto/transform/arg.hpp&gt;">boost/proto/transform/arg.hpp</a>&gt;
  33
  34 </span>
  35 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">,</span> <span class="keyword">typename</span> State<span class="special">,</span> <span class="keyword">typename</span> Data<span class="special">&gt;</span>
  36 <span class="keyword">struct</span> <a class="link" href="impl.html" title="Struct template impl">impl</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="../transform_impl.html" title="Struct template transform_impl">proto::transform_impl</a><span class="special">&lt;</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</span> <span class="special">&gt;</span> <span class="special">{</span>
  37   <span class="comment">// types</span>
  38   <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="link" href="../result_of/child_c.html" title="Struct template child_c">proto::result_of::child_c</a><span class="special">&lt;</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">N</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <a name="boost.proto._child_c.impl.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
  39
  40   <span class="comment">// <a class="link" href="impl.html#idp227826928-bb">public member functions</a></span>
  41   <span class="keyword">typename</span> <a class="link" href="../result_of/child_c.html" title="Struct template child_c">proto::result_of::child_c</a><span class="special">&lt;</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">N</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
  42   <a class="link" href="impl.html#idp227827488-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">expr_param</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span>
  43              <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">data_param</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  44 <span class="special">}</span><span class="special">;</span></pre></div>
  45 <div class="refsect1">
  46 <a name="idp386671760"></a><h2>Description</h2>
  47 <div class="refsect2">
  48 <a name="idp386672176"></a><h3>
  49 <a name="idp227826928-bb"></a><code class="computeroutput">impl</code> public member functions</h3>
  50 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  51 <pre class="literallayout"><span class="keyword">typename</span> <a class="link" href="../result_of/child_c.html" title="Struct template child_c">proto::result_of::child_c</a><span class="special">&lt;</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">N</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
  52 <a name="idp227827488-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">expr_param</span> expr<span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span>
  53            <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">data_param</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
  54 <p>
  55                   Returns the N-th child of <code class="computeroutput">expr</code>
  56                 </p>
  57 <div class="variablelist"><table border="0" class="variablelist compact">
  58 <colgroup>
  59 <col align="left" valign="top">
  60 <col>
  61 </colgroup>
  62 <tbody>
  63 <tr>
  64 <td><p><span class="term">Parameters:</span></p></td>
  65 <td><div class="variablelist"><table border="0" class="variablelist compact">
  66 <colgroup>
  67 <col align="left" valign="top">
  68 <col>
  69 </colgroup>
  70 <tbody><tr>
  71 <td><p><span class="term"><code class="computeroutput">expr</code></span></p></td>
  72 <td><p>The current expression. </p></td>
  73 </tr></tbody>
  74 </table></div></td>
  75 </tr>
  76 <tr>
  77 <td><p><span class="term">Requires:</span></p></td>
  78 <td><p>
  79                   <code class="computeroutput">Expr::proto_arity::value &gt; N</code>
  80                 </p></td>
  81 </tr>
  82 <tr>
  83 <td><p><span class="term">Returns:</span></p></td>
  84 <td><p>
  85                   <code class="computeroutput"><a class="link" href="../child_c_idp227698512.html" title="Function child_c">proto::child_c</a>&lt;N&gt;(expr)</code>
  86                 </p></td>
  87 </tr>
  88 <tr>
  89 <td><p><span class="term">Throws:</span></p></td>
  90 <td>Will not throw.</td>
  91 </tr>
  92 </tbody>
  93 </table></div>
  94 </li></ol></div>
  95 </div>
  96 </div>
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 100 <td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
 101         Distributed under the Boost Software License, Version 1.0. (See accompanying
 102         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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