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<h2><span class="refentrytitle">Struct template vararg</span></h2>
<p>boost::proto::vararg — For matching a Grammar to a variable number of sub-expressions.</p>
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<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.matches_hpp" title="Header <boost/proto/matches.hpp>">boost/proto/matches.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Grammar<span class="special">></span>
<span class="keyword">struct</span> <a class="link" href="vararg.html" title="Struct template vararg">vararg</a> <span class="special">{</span>
<span class="special">}</span><span class="special">;</span></pre></div>
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<a name="idm45555184979408"></a><h2>Description</h2>
<p>
An expression type <code class="computeroutput"><a class="link" href="basic_expr.html" title="Struct template basic_expr">proto::basic_expr</a><AT,
<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>
matches a grammar <code class="computeroutput"><a class="link" href="basic_expr.html" title="Struct template basic_expr">proto::basic_expr</a><BT,
<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>
if <code class="computeroutput">BT</code> is <code class="computeroutput"><a class="link" href="_.html" title="Struct _">proto::_</a></code>
or <code class="computeroutput">AT</code>, and if
<code class="computeroutput">A<sub>x</sub></code> matches
<code class="computeroutput">B<sub>x</sub></code>
for each <code class="computeroutput">x</code> in <code class="computeroutput">[0,n]</code>
and if <code class="computeroutput">U<sub>x</sub></code> matches
<code class="computeroutput">V</code> for each <code class="computeroutput">x</code> in <code class="computeroutput">[0,m]</code>.
</p>
<p>For example:</p>
<p>
</p>
<pre class="programlisting"><span class="comment">// Match any function call expression, regardless</span>
<span class="comment">// of the number of function arguments:</span>
<span class="keyword">struct</span> <span class="identifier">Function</span> <span class="special">:</span>
<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>
<span class="special">{</span><span class="special">}</span><span class="special">;</span></pre>
<p>
</p>
<p>
When used as a transform, <code class="computeroutput">proto::vararg<G></code>
applies <code class="computeroutput">G</code>'s transform.
</p>
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<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>)
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