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+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
+<title>Struct template child</title>
+<link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css">
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+<link rel="home" href="../../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset">
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+</div>
+<div class="refentry">
+<a name="boost.proto.functional.child"></a><div class="titlepage"></div>
+<div class="refnamediv">
+<h2><span class="refentrytitle">Struct template child</span></h2>
+<p>boost::proto::functional::child &#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_id1527766.html" title="Function child">proto::child()</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">typename</span> N <span class="special">=</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">long_</span><span class="special">&lt;</span><span class="number">0</span><span class="special">&gt;</span> <span class="special">&gt;</span>
+<span class="keyword">struct</span> <a class="link" href="child.html" title="Struct template child">child</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/result_This_Expr__id1518943.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.html" title="Struct template child">proto::result_of::child</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.html#id1518979-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.html" title="Struct template child">proto::result_of::child</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.html#id1518984-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.html" title="Struct template child">proto::result_of::child</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.html#id1519091-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="id2806478"></a><h2>Description</h2>
+<p>
+ 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_id1527766.html" title="Function child">proto::child()</a></code>
+ function. <code class="computeroutput">N</code> is required to be an MPL Integral Constant.
+ </p>
+<div class="refsect2">
+<a name="id2806512"></a><h3>
+<a name="id1518979-bb"></a><code class="computeroutput">child</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.html" title="Struct template child">proto::result_of::child</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="id1518984-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">
+<col align="left" valign="top">
+<tbody>
+<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 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::value &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_id1527766.html" title="Function child">proto::child</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.html" title="Struct template child">proto::result_of::child</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="id1519091-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>
+</ol></div>
+</div>
+</div>
+</div>
+<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
+<td align="left"></td>
+<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>
+</div></td>
+</tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="child_c/result_This_Expr__id1518688.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../../proto/reference.html#header.boost.proto.traits_hpp"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="child/result_This_Expr__id1518943.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
+</div>
+</body>
+</html>