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<div class="refentry" title="Function child">
<a name="boost.proto.child_id1264914"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Function child</span></h2>
<p>boost::proto::child &#8212; Return the <em class="replaceable"><code>N</code></em><sup>th</sup> child of the specified Proto expression. </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="emphasis"><em>// 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;

</em></span>
<span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> N, <span class="bold"><strong>typename</strong></span> Expr&gt; 
  <span class="type"><span class="bold"><strong>typename</strong></span> <a class="link" href="result_of/child.html" title="Struct template child">proto::result_of::child</a>&lt; Expr &amp;, N &gt;::type</span> child(Expr &amp; expr);
<span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> N, <span class="bold"><strong>typename</strong></span> Expr&gt; 
  <span class="type"><span class="bold"><strong>typename</strong></span> <a class="link" href="result_of/child.html" title="Struct template child">proto::result_of::child</a>&lt; Expr <span class="bold"><strong>const</strong></span> &amp;, N &gt;::type</span> 
  child(Expr <span class="bold"><strong>const</strong></span> &amp; expr);
<span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> Expr&gt; 
  <span class="type"><span class="bold"><strong>typename</strong></span> <a class="link" href="result_of/child.html" title="Struct template child">proto::result_of::child</a>&lt; Expr &amp; &gt;::type</span> child(Expr &amp; expr);
<span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> Expr&gt; 
  <span class="type"><span class="bold"><strong>typename</strong></span> <a class="link" href="result_of/child.html" title="Struct template child">proto::result_of::child</a>&lt; Expr <span class="bold"><strong>const</strong></span> &amp; &gt;::type</span> 
  child(Expr <span class="bold"><strong>const</strong></span> &amp; expr);</pre></div>
<div class="refsect1" title="Description">
<a name="id1661195"></a><h2>Description</h2>
<p>
            Return the <em class="replaceable"><code>N</code></em><sup>th</sup> child of the specified Proto expression.
            If <code class="computeroutput">N</code> is not specified, as in <code class="computeroutput">proto::child(expr)</code>,
            then <code class="computeroutput">N</code> is assumed to be <code class="computeroutput">mpl::long_&lt;0&gt;</code>.
            The child is returned by reference.
          </p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
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<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">expr</code></span></p></td>
<td><p>The Proto expression. </p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td>
<p>
            <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
            <code class="computeroutput">true</code>.
          </p>
<p>
            <code class="computeroutput">N</code> is an MPL Integral Constant.
          </p>
<p>
            <code class="computeroutput">N::value &lt; Expr::proto_arity::value</code>
          </p>
</td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>A reference to the <em class="replaceable"><code>N</code></em><sup>th</sup> child
          of <code class="computeroutput">expr</code>.</p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw.</td>
</tr>
</tbody>
</table></div>
</div>
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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>)
      </p>
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