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  26 <div class="refentry">
  27 <a name="boost.proto.lazy.impl"></a><div class="titlepage"></div>
  28 <div class="refnamediv">
  29 <h2><span class="refentrytitle">Struct template impl</span></h2>
  30 <p>boost::proto::lazy::impl</p>
  31 </div>
  32 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  33 <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.lazy_hpp" title="Header &lt;boost/proto/transform/lazy.hpp&gt;">boost/proto/transform/lazy.hpp</a>&gt;
  34
  35 </span>
  36 <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>
  37 <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>
  38   <span class="comment">// <a class="link" href="impl.html#boost.proto.lazy.impltypes">types</a></span>
  39   <span class="keyword">typedef</span> <em class="replaceable"><code><span class="identifier">see</span><span class="special">-</span><span class="identifier">below</span></code></em> <a class="link" href="impl.html#boost.proto.lazy.impl.result_type"><span class="identifier">result_type</span></a><span class="special">;</span>
  40
  41   <span class="comment">// <a class="link" href="impl.html#idp705489136-bb">public member functions</a></span>
  42   <span class="identifier">result_type</span> <a class="link" href="impl.html#idp705489696-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>
  43                          <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span>
  44                          <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>
  45 <span class="special">}</span><span class="special">;</span></pre></div>
  46 <div class="refsect1">
  47 <a name="idp483530416"></a><h2>Description</h2>
  48 <div class="refsect2">
  49 <a name="idp483530832"></a><h3>
  50 <a name="boost.proto.lazy.impltypes"></a><code class="computeroutput">impl</code>
  51         public
  52        types</h3>
  53 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  54 <p>
  55 <span class="keyword">typedef</span> <em class="replaceable"><code><span class="identifier">see</span><span class="special">-</span><span class="identifier">below</span></code></em> <a name="boost.proto.lazy.impl.result_type"></a><span class="identifier">result_type</span><span class="special">;</span></p>
  56 <p>
  57                 <code class="computeroutput"><a class="link" href="../lazy.html" title="Struct template lazy">proto::lazy</a>&lt;T&gt;::impl&lt;Expr,State,Data&gt;::result_type</code>
  58                 is calculated as follows:
  59                 </p>
  60 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  61 <li class="listitem"><p>
  62                       If <code class="computeroutput">T</code> if of the form
  63                       <code class="computeroutput">O(A<sub>0</sub>,&#8230;A<sub>n</sub>)</code>, then let <code class="computeroutput">O'</code>
  64                       be <code class="computeroutput">boost::result_of&lt;<a class="link" href="../make.html" title="Struct template make">proto::make</a>&lt;O&gt;(Expr, State, Data)&gt;::type</code>
  65                       and let <code class="computeroutput">T'</code> be <code class="computeroutput">O'(A<sub>0</sub>,&#8230;A<sub>n</sub>)</code>.
  66                     </p></li>
  67 <li class="listitem"><p>
  68                       If <code class="computeroutput">T</code> if of the form
  69                       <code class="computeroutput">O(A<sub>0</sub>,&#8230;A<sub>n</sub> ...)</code>, then let <code class="computeroutput">O'</code>
  70                       be <code class="computeroutput">boost::result_of&lt;<a class="link" href="../make.html" title="Struct template make">proto::make</a>&lt;O&gt;(Expr, State, Data)&gt;::type</code>
  71                       and let <code class="computeroutput">T'</code> be <code class="computeroutput">O'(A<sub>0</sub>,&#8230;A<sub>n</sub> ...)</code>.
  72                     </p></li>
  73 <li class="listitem"><p>
  74                       Otherwise, let <code class="computeroutput">T'</code>
  75                       be <code class="computeroutput">boost::result_of&lt;<a class="link" href="../make.html" title="Struct template make">proto::make</a>&lt;T&gt;(Expr, State, Data)&gt;::type</code>.
  76                     </p></li>
  77 </ul></div>
  78 <p>
  79                 </p>
  80 <p>
  81                   The result type is
  82                   <code class="computeroutput">
  83                     boost::result_of&lt;<a class="link" href="../call.html" title="Struct template call">proto::call</a>&lt;T'&gt;(Expr, State, Data)&gt;::type
  84                   </code>.
  85                 </p>
  86 <p>
  87               </p>
  88 </li></ol></div>
  89 </div>
  90 <div class="refsect2">
  91 <a name="idp483560576"></a><h3>
  92 <a name="idp705489136-bb"></a><code class="computeroutput">impl</code> public member functions</h3>
  93 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  94 <pre class="literallayout"><span class="identifier">result_type</span> <a name="idp705489696-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>
  95                        <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>
  96                        <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>
  97 <p>
  98                   <code class="computeroutput"><code class="computeroutput"><a class="link" href="../lazy.html" title="Struct template lazy">proto::lazy</a></code>&lt;T&gt;::impl&lt;Expr,State,Data&gt;::operator()</code> behaves as follows:
  99                   </p>
 100 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 101 <li class="listitem"><p>
 102                         If <code class="computeroutput">T</code> if of the form
 103                         <code class="computeroutput">O(A<sub>0</sub>,&#8230;A<sub>n</sub>)</code>, then let <code class="computeroutput">O'</code>
 104                         be <code class="computeroutput">boost::result_of&lt;<code class="computeroutput"><a class="link" href="../make.html" title="Struct template make">proto::make</a></code>&lt;O&gt;(Expr, State, Data)&gt;::type</code>
 105                         and let <code class="computeroutput">T'</code> be <code class="computeroutput">O'(A<sub>0</sub>,&#8230;A<sub>n</sub>)</code>.
 106                       </p></li>
 107 <li class="listitem"><p>
 108                         If <code class="computeroutput">T</code> if of the form
 109                         <code class="computeroutput">O(A<sub>0</sub>,&#8230;A<sub>n</sub> ...)</code>, then let <code class="computeroutput">O'</code>
 110                         be <code class="computeroutput">boost::result_of&lt;<code class="computeroutput"><a class="link" href="../make.html" title="Struct template make">proto::make</a></code>&lt;O&gt;(Expr, State, Data)&gt;::type</code>
 111                         and let <code class="computeroutput">T'</code> be <code class="computeroutput">O'(A<sub>0</sub>,&#8230;A<sub>n</sub> ...)</code>.
 112                       </p></li>
 113 <li class="listitem"><p>
 114                         Otherwise, let <code class="computeroutput">T'</code>
 115                         be <code class="computeroutput">boost::result_of&lt;<code class="computeroutput"><a class="link" href="../make.html" title="Struct template make">proto::make</a></code>&lt;T&gt;(Expr, State, Data)&gt;::type</code>.
 116                       </p></li>
 117 </ul></div>
 118 <p>
 119                 </p>
 120 <div class="variablelist"><table border="0" class="variablelist compact">
 121 <colgroup>
 122 <col align="left" valign="top">
 123 <col>
 124 </colgroup>
 125 <tbody><tr>
 126 <td><p><span class="term">Returns:</span></p></td>
 127 <td><p>
 128                   <code class="computeroutput">
 129                     <a class="link" href="../call.html" title="Struct template call">proto::call</a>&lt;T'&gt;()(expr, state, data)
 130                   </code>
 131                 </p></td>
 132 </tr></tbody>
 133 </table></div>
 134 </li></ol></div>
 135 </div>
 136 </div>
 137 </div>
 138 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 139 <td align="left"></td>
 140 <td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
 141         Distributed under the Boost Software License, Version 1.0. (See accompanying
 142         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>)
 143       </p>
 144 </div></td>
 145 </tr></table>
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