1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Struct template vararg</title> 6<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="../../proto/reference.html#header.boost.proto.matches_hpp" title="Header <boost/proto/matches.hpp>"> 10<link rel="prev" href="convertible_to.html" title="Struct template convertible_to"> 11<link rel="next" href="matches.html" title="Struct template matches"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" 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class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Struct template vararg</span></h2> 30<p>boost::proto::vararg — For matching a Grammar to a variable number of sub-expressions.</p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<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.matches_hpp" title="Header <boost/proto/matches.hpp>">boost/proto/matches.hpp</a>> 34 35</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Grammar<span class="special">></span> 36<span class="keyword">struct</span> <a class="link" href="vararg.html" title="Struct template vararg">vararg</a> <span class="special">{</span> 37<span class="special">}</span><span class="special">;</span></pre></div> 38<div class="refsect1"> 39<a name="id-1.3.33.5.34.12.4"></a><h2>Description</h2> 40<p> 41 An expression type <code class="computeroutput"><a class="link" href="basic_expr.html" title="Struct template basic_expr">proto::basic_expr</a><AT, 42 <a class="link" href="listN.html" title="Struct template listN">proto::listN</a><A<sub>0</sub>,...A<sub>n</sub>,U<sub>0</sub>,...U<sub>m</sub>> ></code> 43 matches a grammar <code class="computeroutput"><a class="link" href="basic_expr.html" title="Struct template basic_expr">proto::basic_expr</a><BT, 44 <a class="link" href="listN.html" title="Struct template listN">proto::listM</a><B<sub>0</sub>,...B<sub>n</sub>,proto::vararg<V> > ></code> 45 if <code class="computeroutput">BT</code> is <code class="computeroutput"><a class="link" href="_.html" title="Struct _">proto::_</a></code> 46 or <code class="computeroutput">AT</code>, and if 47 <code class="computeroutput">A<sub>x</sub></code> matches 48 <code class="computeroutput">B<sub>x</sub></code> 49 for each <code class="computeroutput">x</code> in <code class="computeroutput">[0,n]</code> 50 and if <code class="computeroutput">U<sub>x</sub></code> matches 51 <code class="computeroutput">V</code> for each <code class="computeroutput">x</code> in <code class="computeroutput">[0,m]</code>. 52 </p> 53<p>For example:</p> 54<p> 55 </p> 56<pre class="programlisting"><span class="comment">// Match any function call expression, regardless</span> 57<span class="comment">// of the number of function arguments:</span> 58<span class="keyword">struct</span> <span class="identifier">Function</span> <span class="special">:</span> 59 <a class="link" href="function.html" title="Struct template function">proto::function</a><span class="special"><</span> <span class="identifier">proto</span><span class="special">::</span><span class="identifier">vararg</span><span class="special"><</span><span class="identifier">proto</span><span class="special">::</span><span class="identifier">_</span><span class="special">></span> <span class="special">></span> 60<span class="special">{</span><span class="special">}</span><span class="special">;</span></pre> 61<p> 62 </p> 63<p> 64 When used as a transform, <code class="computeroutput">proto::vararg<G></code> 65 applies <code class="computeroutput">G</code>'s transform. 66 </p> 67</div> 68</div> 69<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 70<td align="left"></td> 71<td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p> 72 Distributed under the Boost Software License, Version 1.0. (See accompanying 73 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>) 74 </p> 75</div></td> 76</tr></table> 77<hr> 78<div class="spirit-nav"> 79<a accesskey="p" href="convertible_to.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.matches_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="matches.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 80</div> 81</body> 82</html> 83
