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  25 <div class="refentry">
  26 <a name="boost.proto.when_Grammar,_R(_id1560019.impl"></a><div class="titlepage"></div>
  27 <div class="refnamediv">
  28 <h2><span class="refentrytitle">Struct template impl</span></h2>
  29 <p>boost::proto::when&lt;Grammar, R(A...)&gt;::impl</p>
  30 </div>
  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../../proto/reference.html#header.boost.proto.transform.when_hpp" title="Header &lt;boost/proto/transform/when.hpp&gt;">boost/proto/transform/when.hpp</a>&gt;
  33
  34 </span>
  35 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span>
  36 <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>&lt; Expr, State, Data &gt; <span class="special">{</span>
  37   <span class="comment">// types</span>
  38   <span class="keyword">typedef</span> <a class="link" href="../call.html" title="Struct template call">proto::call</a><span class="special">&lt;</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">&gt;</span>                                       <a name="boost.proto.when_Grammar,_R(_id1560019.impl.call_"></a><span class="identifier">call_</span><span class="special">;</span>        <span class="comment">// For exposition only</span>
  39   <span class="keyword">typedef</span> <a class="link" href="../make.html" title="Struct template make">proto::make</a><span class="special">&lt;</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">&gt;</span>                                       <a name="boost.proto.when_Grammar,_R(_id1560019.impl.make_"></a><span class="identifier">make_</span><span class="special">;</span>        <span class="comment">// For exposition only</span>
  40   <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">&lt;</span><a class="link" href="../is_callable.html" title="Struct template is_callable">proto::is_callable</a><span class="special">&lt;</span><span class="identifier">R</span><span class="special">&gt;</span><span class="special">,</span><span class="identifier">call_</span><span class="special">,</span><span class="identifier">make_</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <a name="boost.proto.when_Grammar,_R(_id1560019.impl.which"></a><span class="identifier">which</span><span class="special">;</span>        <span class="comment">// For exposition only</span>
  41   <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">&lt;</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">&gt;</span><span class="special">::</span><span class="identifier">type</span>  <a name="boost.proto.when_Grammar,_R(_id1560019.impl.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
  42
  43   <span class="comment">// <a class="link" href="impl.html#id1560222-bb">public member functions</a></span>
  44   <span class="identifier">result_type</span> <a class="link" href="impl.html#id1560226-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>
  45                          <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span>
  46                          <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>
  47 <span class="special">}</span><span class="special">;</span></pre></div>
  48 <div class="refsect1">
  49 <a name="id2939218"></a><h2>Description</h2>
  50 <div class="refsect2">
  51 <a name="id2939222"></a><h3>
  52 <a name="id1560222-bb"></a><code class="computeroutput">impl</code> public member functions</h3>
  53 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  54 <pre class="literallayout"><span class="identifier">result_type</span> <a name="id1560226-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>
  55                        <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>
  56                        <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>
  57 <p>
  58                   Evaluate <code class="computeroutput">R(A...)</code> as a transform either with
  59                   <code class="computeroutput"><code class="computeroutput"><a class="link" href="../call.html" title="Struct template call">proto::call&lt;&gt;</a></code></code> or with
  60                   <code class="computeroutput"><code class="computeroutput"><a class="link" href="../make.html" title="Struct template make">proto::make&lt;&gt;</a></code></code> depending
  61                   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>&lt;R&gt;::value</code>
  62                   is <code class="computeroutput">true</code> or <code class="computeroutput">false</code>.
  63                 </p>
  64 <div class="variablelist"><table border="0">
  65 <col align="left" valign="top">
  66 <tbody>
  67 <tr>
  68 <td><p><span class="term">Parameters:</span></p></td>
  69 <td><div class="variablelist"><table border="0">
  70 <col align="left" valign="top">
  71 <tbody>
  72 <tr>
  73 <td><p><span class="term"><code class="computeroutput">data</code></span></p></td>
  74 <td><p>An arbitrary data </p></td>
  75 </tr>
  76 <tr>
  77 <td><p><span class="term"><code class="computeroutput">expr</code></span></p></td>
  78 <td><p>The current expression </p></td>
  79 </tr>
  80 <tr>
  81 <td><p><span class="term"><code class="computeroutput">state</code></span></p></td>
  82 <td><p>The current state </p></td>
  83 </tr>
  84 </tbody>
  85 </table></div></td>
  86 </tr>
  87 <tr>
  88 <td><p><span class="term">Requires:</span></p></td>
  89 <td><p>
  90                   <code class="computeroutput"><a class="link" href="../matches.html" title="Struct template matches">proto::matches</a>&lt;Expr, Grammar&gt;::value</code>
  91                   is <code class="computeroutput">true</code>.
  92                 </p></td>
  93 </tr>
  94 <tr>
  95 <td><p><span class="term">Returns:</span></p></td>
  96 <td><p>
  97                   <code class="computeroutput">which()(expr, state, data)</code>
  98                 </p></td>
  99 </tr>
 100 </tbody>
 101 </table></div>
 102 </li></ol></div>
 103 </div>
 104 </div>
 105 </div>
 106 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 107 <td align="left"></td>
 108 <td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
 109         Distributed under the Boost Software License, Version 1.0. (See accompanying
 110         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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