<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Macro BOOST_PROTO_BASIC_EXTENDS</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.extends_hpp" title="Header <boost/proto/extends.hpp>"> <link rel="prev" href="boost/proto/extends/result.html" title="Struct template result"> <link rel="next" href="BOOST_PROTO_EXTENDS_ASSIGN.html" title="Macro BOOST_PROTO_EXTENDS_ASSIGN"> </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="boost/proto/extends/result.html"><img src="../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="proto/reference.html#header.boost.proto.extends_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="BOOST_PROTO_EXTENDS_ASSIGN.html"><img src="../../doc/html/images/next.png" alt="Next"></a> </div> <div class="refentry" title="Macro BOOST_PROTO_BASIC_EXTENDS"> <a name="BOOST_PROTO_BASIC_EXTENDS"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Macro BOOST_PROTO_BASIC_EXTENDS</span></h2> <p>BOOST_PROTO_BASIC_EXTENDS — For creating expression wrappers that add members to a Proto expression template, like <code class="computeroutput"><a class="link" href="boost/proto/extends.html" title="Struct template extends">proto::extends<></a></code>, but while retaining POD-ness of the expression wrapper.</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.extends_hpp" title="Header <boost/proto/extends.hpp>">boost/proto/extends.hpp</a>> </em></span>BOOST_PROTO_BASIC_EXTENDS(Expr, Derived, Domain)</pre></div> <div class="refsect1" title="Description"> <a name="id1587176"></a><h2>Description</h2> <p> <code class="computeroutput">BOOST_PROTO_BASIC_EXTENDS()</code> adds the basic typedefs, member functions, and data members necessary to make a struct a valid Proto expression extension. It does <span class="emphasis"><em>not</em></span> add any constructors, virtual functions or access control blocks that would render the containing struct non-POD. </p> <p> <code class="computeroutput">Expr</code> is the Proto expression that the enclosing struct extends. <code class="computeroutput">Derived</code> is the type of the enclosing struct. <code class="computeroutput">Domain</code> is the Proto domain to which this expression extension belongs. (See <code class="computeroutput"><a class="link" href="boost/proto/domain.html" title="Struct template domain">proto::domain<></a></code>.) </p> <p><code class="computeroutput">BOOST_PROTO_BASIC_EXTENDS()</code> adds to its enclosing struct exactly one data member of type <code class="computeroutput">Expr</code>. </p> <p> <span class="bold"><strong>Example:</strong></span></p> <pre class="programlisting">template< class Expr > struct my_expr; struct my_domain : <a class="link" href="boost/proto/domain.html" title="Struct template domain">proto::domain</a>< <a class="link" href="boost/proto/pod_generator.html" title="Struct template pod_generator">proto::pod_generator</a>< my_expr > > {}; template< class Expr > struct my_expr { // OK, this makes my_expr<> a valid Proto expression extension. // my_expr<> does /not/ have overloaded assignment, subscript, // and function call operators that build expression templates, however. <a class="link" href="BOOST_PROTO_BASIC_EXTENDS.html" title="Macro BOOST_PROTO_BASIC_EXTENDS">BOOST_PROTO_BASIC_EXTENDS</a>(Expr, my_expr, my_domain) }; // OK, my_expr<> is POD, so this is statically initialized: my_expr< <a class="link" href="boost/proto/terminal.html" title="Struct template terminal">proto::terminal</a><int>::type > const _1 = {{1}};</pre> <p> </p> <p> See also: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"><code class="computeroutput"><a class="link" href="BOOST_PROTO_EXTENDS_ASSIGN.html" title="Macro BOOST_PROTO_EXTENDS_ASSIGN">BOOST_PROTO_EXTENDS_ASSIGN</a>()</code></li> <li class="listitem"><code class="computeroutput"><a class="link" href="BOOST_PROTO_EXTENDS_SUBSCRIPT.html" title="Macro BOOST_PROTO_EXTENDS_SUBSCRIPT">BOOST_PROTO_EXTENDS_SUBSCRIPT</a>()</code></li> <li class="listitem"><code class="computeroutput"><a class="link" href="BOOST_PROTO_EXTENDS_FUNCTION.html" title="Macro BOOST_PROTO_EXTENDS_FUNCTION">BOOST_PROTO_EXTENDS_FUNCTION</a>()</code></li> <li class="listitem"><code class="computeroutput"><a class="link" href="BOOST_PROTO_EXTENDS.html" title="Macro BOOST_PROTO_EXTENDS">BOOST_PROTO_EXTENDS</a>()</code></li> </ul></div> <p> </p> </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="boost/proto/extends/result.html"><img src="../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="proto/reference.html#header.boost.proto.extends_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="BOOST_PROTO_EXTENDS_ASSIGN.html"><img src="../../doc/html/images/next.png" alt="Next"></a> </div> </body> </html>