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  28. <h2><span class="refentrytitle">Function child_c</span></h2>
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  29. <p>boost::proto::child_c &#8212; Return the <em class="replaceable"><code>N</code></em><sup>th</sup> child of the specified
    30. 

  30.           Proto expression. </p>
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  31. </div>
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  32. <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
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  33. <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.traits_hpp" title="Header &lt;boost/proto/traits.hpp&gt;">boost/proto/traits.hpp</a>&gt;
    34. 

  34. 

  35. </span>
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  36. <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">long</span> N<span class="special">,</span> <span class="keyword">typename</span> <a class="link" href="../../Expr.html" title="Concept Expr">Expr</a><span class="special">&gt;</span> 
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  37.   <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">&amp;</span><span class="special">,</span> <span class="identifier">N</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="identifier">child_c</span><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&amp;</span> expr<span class="special">)</span><span class="special">;</span>
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  38. <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">long</span> N<span class="special">,</span> <span class="keyword">typename</span> <a class="link" href="../../Expr.html" title="Concept Expr">Expr</a><span class="special">&gt;</span> 
    39. 

  39.   <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="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">N</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> 
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  40.   <span class="identifier">child_c</span><span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&amp;</span> expr<span class="special">)</span><span class="special">;</span></pre></div>
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  41. <div class="refsect1">
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  42. <a name="idp385987168"></a><h2>Description</h2>
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  43. <p>
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  44.             Return the <em class="replaceable"><code>N</code></em><sup>th</sup> child of the specified Proto
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  45.             expression. The child is returned by reference.
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  46.           </p>
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  54. <td><p><span class="term">Requires:</span></p></td>
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  55. <td>
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  56. <p>
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  57.             <code class="computeroutput"><a class="link" href="is_expr.html" title="Struct template is_expr">proto::is_expr</a>&lt;Expr&gt;::value</code> is
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  58.             <code class="computeroutput">true</code>.
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  59.           </p>
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  60. <p>
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  61.             <code class="computeroutput">N &lt; Expr::proto_arity::value</code>
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  62.           </p>
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  63. </td>
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  64. </tr>
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  65. <tr>
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  66. <td><p><span class="term">Returns:</span></p></td>
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  67. <td><p>A reference to the <em class="replaceable"><code>N</code></em><sup>th</sup> child
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  68.             of <code class="computeroutput">expr</code>.</p></td>
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  69. </tr>
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  71. <td><p><span class="term">Throws:</span></p></td>
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  72. <td>Will not throw.</td>
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  79. <td align="left"></td>
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  80. <td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
    81. 

  81.         Distributed under the Boost Software License, Version 1.0. (See accompanying
    82. 

  82.         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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  83.       </p>
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