<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Struct by_value_generator</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../proto/reference.html#header.boost.proto.generate_hpp" title="Header <boost/proto/generate.hpp>"> <link rel="prev" href="pod_generator/result_T_idm45506975282944.html" title="Struct template result<This(Expr)>"> <link rel="next" href="by_value_generator/result_T_idm45506975265200.html" title="Struct template result<This(Expr)>"> </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="pod_generator/result_T_idm45506975282944.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.generate_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="by_value_generator/result_T_idm45506975265200.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="refentry"> <a name="boost.proto.by_value_generator"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Struct by_value_generator</span></h2> <p>boost::proto::by_value_generator — A generator that replaces child nodes held by reference with ones held by value. Use with <code class="computeroutput"><a class="link" href="compose_generators.html" title="Struct template compose_generators">proto::compose_generators<></a> </code> to forward that result to another generator. </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.generate_hpp" title="Header <boost/proto/generate.hpp>">boost/proto/generate.hpp</a>> </span> <span class="keyword">struct</span> <a class="link" href="by_value_generator.html" title="Struct by_value_generator">by_value_generator</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"><</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">></span> <span class="keyword">struct</span> <a class="link" href="by_value_generator/result_T_idm45506975265200.html" title="Struct template result<This(Expr)>">result</a><span class="special"><</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">Expr</span><span class="special">)</span><span class="special">></span> <span class="special">{</span> <span class="comment">// types</span> <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a class="link" href="by_value_generator/result_T_idm45506975265200.html#boost.proto.by_value_generator.result_T_idm45506975265200.type"><span class="identifier">type</span></a><span class="special">;</span> <span class="special">}</span><span class="special">;</span> <span class="comment">// <a class="link" href="by_value_generator.html#idm45506975260720-bb">public member functions</a></span> <span class="keyword">template</span><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="emphasis"><em><span class="identifier">unspecified</span></em></span> <a class="link" href="by_value_generator.html#idm45506975260160-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">&</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="idm45555187165872"></a><h2>Description</h2> <p> Generators are intended for use as the first template parameter to the <code class="computeroutput"><a class="link" href="domain.html" title="Struct template domain">proto::domain<></a></code> class template and control if and how expressions within that domain are to be customized. <code class="computeroutput">proto::by_value_generator</code> ensures all child nodes are held by value. This generator is typically composed with a second generator for further processing, as <code class="computeroutput"><a class="link" href="compose_generators.html" title="Struct template compose_generators">proto::compose_generators</a><proto::by_value_generator, MyGenerator></code>. </p> <div class="refsect2"> <a name="idm45555187161088"></a><h3> <a name="idm45506975260720-bb"></a><code class="computeroutput">by_value_generator</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"><</span><span class="keyword">typename</span> <a class="link" href="../../Expr.html" title="Concept Expr">Expr</a><span class="special">></span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="idm45506975260160-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">&</span> expr<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <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>A Proto expression.</p></td> </tr></tbody> </table></div></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>Equivalent to <code class="computeroutput"><a class="link" href="deep_cop_idm45506996666736.html" title="Function template deep_copy">proto::deep_copy</a>(expr)</code></p></td> </tr> </tbody> </table></div> </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 © 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="pod_generator/result_T_idm45506975282944.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.generate_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="by_value_generator/result_T_idm45506975265200.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>