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<div class="refentry">
<a name="boost.proto.and_"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Struct template and_</span></h2>
<p>boost::proto::and_ — For matching all of a set of grammars. When used as a transform,
<code class="computeroutput">proto::and_<></code> applies the transform associated
with each grammar in the set and returns the result of the last.</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.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><span class="special">...</span> G<span class="special">></span>
<span class="keyword">struct</span> <a class="link" href="and_.html" title="Struct template and_">and_</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="transform.html" title="Struct template transform">proto::transform</a><and_<G...> > <span class="special">{</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="identifier">and_</span> <a name="boost.proto.and_.proto_grammar"></a><span class="identifier">proto_grammar</span><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> <a class="link" href="../../Expr.html" title="Concept Expr">Expr</a><span class="special">,</span> <span class="keyword">typename</span> State<span class="special">,</span> <span class="keyword">typename</span> Data<span class="special">></span>
<span class="keyword">struct</span> <a class="link" href="and_/impl.html" title="Struct template impl">impl</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="transform_impl.html" title="Struct template transform_impl">proto::transform_impl</a>< Expr, State, Data > <span class="special">{</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span><span class="special"><</span><span class="identifier">G</span><sub><span class="identifier">n</span></sub><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</span><span class="special">)</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a class="link" href="and_/impl.html#boost.proto.and_.impl.result_type"><span class="identifier">result_type</span></a><span class="special">;</span>
<span class="comment">// <a class="link" href="and_/impl.html#idm45506988345472-bb">public member functions</a></span>
<span class="identifier">result_type</span> <a class="link" href="and_/impl.html#idm45506988344912-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">expr_param</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">data_param</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm45555185207648"></a><h2>Description</h2>
<p>
An expression type <code class="computeroutput">E</code> matches
<code class="computeroutput">proto::and_<G<sub>0</sub>,G<sub>1</sub>,...G<sub>n</sub>></code>
if <code class="computeroutput">E</code> matches all <code class="computeroutput">G<sub>x</sub></code>
for <code class="computeroutput">x</code> in <code class="computeroutput">[0,n]</code>.
</p>
<p>
When applying
<code class="computeroutput">proto::and_<G<sub>0</sub>,G<sub>1</sub>,...G<sub>n</sub>></code>
as a transform with an expression <code class="computeroutput">e</code>, state
<code class="computeroutput">s</code> and data <code class="computeroutput">d</code>, it is equivalent
to <code class="computeroutput">(G<sub>0</sub>()(e, s, d),G<sub>1</sub>()(e, s, d),...G<sub>n</sub>()(e, s, d))</code>.
</p>
<p>
The maximun number of template arguments <code class="computeroutput">proto::and_<></code> accepts
is controlled by the <code class="computeroutput"><a class="link" href="../../BOOST_PROTO_MAX_LOGICAL_ARITY.html" title="Macro BOOST_PROTO_MAX_LOGICAL_ARITY">BOOST_PROTO_MAX_LOGICAL_ARITY</a></code>
macro.
</p>
</div>
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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>)
</p>
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