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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> |
| <div class="refsect1"> |
| <a name="id2332745"></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="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>) |
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