<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Function child_c</title>
<link rel="stylesheet" href="../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
<link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset">
<link rel="up" href="../../proto/reference.html#header.boost.proto.traits_hpp" title="Header <boost/proto/traits.hpp>">
<link rel="prev" href="child_id1264914.html" title="Function child">
<link rel="next" href="value_id1265317.html" title="Function value">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%"><tr>
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td>
<td align="center"><a href="../../../../index.html">Home</a></td>
<td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td>
<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
<td align="center"><a href="../../../../more/index.htm">More</a></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="child_id1264914.html"><img src="../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.traits_hpp"><img src="../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="value_id1265317.html"><img src="../../../../doc/html/images/next.png" alt="Next"></a>
</div>
<div class="refentry" title="Function child_c">
<a name="boost.proto.child_c_id1265156"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Function child_c</span></h2>
<p>boost::proto::child_c — 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: <<a class="link" href="../../proto/reference.html#header.boost.proto.traits_hpp" title="Header <boost/proto/traits.hpp>">boost/proto/traits.hpp</a>>
</em></span>
<span class="bold"><strong>template</strong></span><<span class="bold"><strong>long</strong></span> N, <span class="bold"><strong>typename</strong></span> Expr>
<span class="type"><span class="bold"><strong>typename</strong></span> <a class="link" href="result_of/child_c.html" title="Struct template child_c">proto::result_of::child_c</a>< Expr &, N >::type</span> child_c(Expr & expr);
<span class="bold"><strong>template</strong></span><<span class="bold"><strong>long</strong></span> N, <span class="bold"><strong>typename</strong></span> Expr>
<span class="type"><span class="bold"><strong>typename</strong></span> <a class="link" href="result_of/child_c.html" title="Struct template child_c">proto::result_of::child_c</a>< Expr <span class="bold"><strong>const</strong></span> &, N >::type</span>
child_c(Expr <span class="bold"><strong>const</strong></span> & expr);</pre></div>
<div class="refsect1" title="Description">
<a name="id1661445"></a><h2>Description</h2>
<p>
Return the <em class="replaceable"><code>N</code></em><sup>th</sup> child of the specified Proto
expression. The child is returned by reference.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<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><Expr>::value</code> is
<code class="computeroutput">true</code>.
</p>
<p>
<code class="computeroutput">N < 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>
</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 © 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_id1264914.html"><img src="../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.traits_hpp"><img src="../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="value_id1265317.html"><img src="../../../../doc/html/images/next.png" alt="Next"></a>
</div>
</body>
</html>
