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| <a name="boost.proto.when_Grammar,_R(A_)_id1297144.impl"></a><div class="titlepage"></div> |
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| <h2><span class="refentrytitle">Struct template impl</span></h2> |
| <p>boost::proto::when<Grammar, R(A...)>::impl</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.transform.when_hpp" title="Header <boost/proto/transform/when.hpp>">boost/proto/transform/when.hpp</a>> |
| |
| </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="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><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="comment">// types</span> |
| <span class="keyword">typedef</span> <a class="link" href="../call.html" title="Struct template call">proto::call</a><span class="special"><</span><span class="identifier">R</span><span class="special">(</span><span class="identifier">A</span><span class="special">...</span><span class="special">)</span><span class="special">></span> <a name="boost.proto.when_Grammar,_R(A_)_id1297144.impl.call_"></a><span class="identifier">call_</span><span class="special">;</span> <span class="comment">// For exposition only</span> |
| <span class="keyword">typedef</span> <a class="link" href="../make.html" title="Struct template make">proto::make</a><span class="special"><</span><span class="identifier">R</span><span class="special">(</span><span class="identifier">A</span><span class="special">...</span><span class="special">)</span><span class="special">></span> <a name="boost.proto.when_Grammar,_R(A_)_id1297144.impl.make_"></a><span class="identifier">make_</span><span class="special">;</span> <span class="comment">// For exposition only</span> |
| <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">if_</span><span class="special"><</span><a class="link" href="../is_callable.html" title="Struct template is_callable">proto::is_callable</a><span class="special"><</span><span class="identifier">R</span><span class="special">></span><span class="special">,</span><span class="identifier">call_</span><span class="special">,</span><span class="identifier">make_</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="boost.proto.when_Grammar,_R(A_)_id1297144.impl.which"></a><span class="identifier">which</span><span class="special">;</span> <span class="comment">// For exposition only</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">which</span><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 name="boost.proto.when_Grammar,_R(A_)_id1297144.impl.result_type"></a><span class="identifier">result_type</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="impl.html#id1297345-bb">public member functions</a></span> |
| <span class="identifier">result_type</span> <a class="link" href="impl.html#id1297350-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></pre></div> |
| <div class="refsect1"> |
| <a name="id2449706"></a><h2>Description</h2> |
| <div class="refsect2"> |
| <a name="id2449709"></a><h3> |
| <a name="id1297345-bb"></a><code class="computeroutput">impl</code> public member functions</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> |
| <pre class="literallayout"><span class="identifier">result_type</span> <a name="id1297350-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">expr_param</span> expr<span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span> state<span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">data_param</span> data<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> |
| <p> |
| Evaluate <code class="computeroutput">R(A...)</code> as a transform either with |
| <code class="computeroutput"><code class="computeroutput"><a class="link" href="../call.html" title="Struct template call">proto::call<></a></code></code> or with |
| <code class="computeroutput"><code class="computeroutput"><a class="link" href="../make.html" title="Struct template make">proto::make<></a></code></code> depending |
| on whether <code class="computeroutput"><code class="computeroutput"><a class="link" href="../is_callable.html" title="Struct template is_callable">proto::is_callable</a></code><R>::value</code> |
| is <code class="computeroutput">true</code> or <code class="computeroutput">false</code>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term">Parameters:</span></p></td> |
| <td><div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><code class="computeroutput">data</code></span></p></td> |
| <td><p>An arbitrary data </p></td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><code class="computeroutput">expr</code></span></p></td> |
| <td><p>The current expression </p></td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><code class="computeroutput">state</code></span></p></td> |
| <td><p>The current state </p></td> |
| </tr> |
| </tbody> |
| </table></div></td> |
| </tr> |
| <tr> |
| <td><p><span class="term">Requires:</span></p></td> |
| <td><p> |
| <code class="computeroutput"><a class="link" href="../matches.html" title="Struct template matches">proto::matches</a><Expr, Grammar>::value</code> |
| is <code class="computeroutput">true</code>. |
| </p></td> |
| </tr> |
| <tr> |
| <td><p><span class="term">Returns:</span></p></td> |
| <td><p> |
| <code class="computeroutput">which()(expr, state, data)</code> |
| </p></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </li></ol></div> |
| </div> |
| </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> |
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