<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Function child_c</title> <link rel="stylesheet" href="../../../../doc/src/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_id1285210.html" title="Function child"> <link rel="next" href="value_id1285613.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_id1285210.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="value_id1285613.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="refentry"> <a name="boost.proto.child_c_id1285452"></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="comment">// 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>> </span> <span class="keyword">template</span><span class="special"><</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">></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"><</span> <span class="identifier">Expr</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">N</span> <span class="special">></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">&</span> expr<span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</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">></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"><</span> <span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">N</span> <span class="special">></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="keyword">const</span> <span class="special">&</span> expr<span class="special">)</span><span class="special">;</span></pre></div> <div class="refsect1"> <a name="id2421894"></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_id1285210.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="value_id1285613.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>