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<title>Struct template child_c</title>
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<div class="refentry">
<a name="boost.proto.functional.child_c"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Struct template child_c</span></h2>
<p>boost::proto::functional::child_c &#8212; 
            A callable <a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> that is equivalent to the
            <code class="computeroutput"><a class="link" href="../child_c_idp68301400.html" title="Function child_c">proto::child_c()</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.traits_hpp" title="Header &lt;boost/proto/traits.hpp&gt;">boost/proto/traits.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">long</span> N<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="child_c.html" title="Struct template child_c">child_c</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> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">&gt;</span> 
  <span class="keyword">struct</span> <a class="link" href="child_c/result_This_Ex_idp67749448.html" title="Struct template result&lt;This(Expr)&gt;">result</a><span class="special">&lt;</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">Expr</span><span class="special">)</span><span class="special">&gt;</span> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="../result_of/child_c.html" title="Struct template child_c">proto::result_of::child_c</a>&lt; Expr, N &gt; <span class="special">{</span>
  <span class="special">}</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="child_c.html#idp67751496-bb">public member functions</a></span>
  <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">&gt;</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">&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> 
    <a class="link" href="child_c.html#idp67751784-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <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">&gt;</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="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> 
    <a class="link" href="child_c.html#idp67799528-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Expr</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="idp182556168"></a><h2>Description</h2>
<div class="refsect2">
<a name="idp182556376"></a><h3>
<a name="idp67751496-bb"></a><code class="computeroutput">child_c</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> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">&gt;</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">&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> 
  <a name="idp67751784-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&amp;</span> expr<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>
                  Return the <em class="replaceable"><code>N</code></em><sup>th</sup> child of the given expression.
                </p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">expr</code></span></p></td>
<td><p>The expression node. </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 &lt; Expr::proto_arity::value</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_idp68301400.html" title="Function child_c">proto::child_c</a>&lt;N&gt;(expr)</code>
                </p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw.</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><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">&gt;</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="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> 
  <a name="idp67799528-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</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="keyword">const</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
</li>
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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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