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  27 <a name="boost.proto.eval_idp700521824"></a><div class="titlepage"></div>
  28 <div class="refnamediv">
  29 <h2><span class="refentrytitle">Function eval</span></h2>
  30 <p>boost::proto::eval &#8212; Evaluate a given Proto expression with a given context. </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.eval_hpp" title="Header &lt;boost/proto/eval.hpp&gt;">boost/proto/eval.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> Context<span class="special">&gt;</span>
  37   <span class="keyword">typename</span> <a class="link" href="result_of/eval.html" title="Struct template eval">proto::result_of::eval</a><span class="special">&lt;</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">Context</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
  38   <span class="identifier">eval</span><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&amp;</span> expr<span class="special">,</span> <span class="identifier">Context</span> <span class="special">&amp;</span> context<span class="special">)</span><span class="special">;</span>
  39 <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> Context<span class="special">&gt;</span>
  40   <span class="keyword">typename</span> <a class="link" href="result_of/eval.html" title="Struct template eval">proto::result_of::eval</a><span class="special">&lt;</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">Context</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
  41   <span class="identifier">eval</span><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&amp;</span> expr<span class="special">,</span> <span class="identifier">Context</span> <span class="keyword">const</span> <span class="special">&amp;</span> context<span class="special">)</span><span class="special">;</span></pre></div>
  42 <div class="refsect1">
  43 <a name="idp462434816"></a><h2>Description</h2>
  44 <div class="variablelist"><table border="0" class="variablelist compact">
  45 <colgroup>
  46 <col align="left" valign="top">
  47 <col>
  48 </colgroup>
  49 <tbody>
  50 <tr>
  51 <td><p><span class="term">Parameters:</span></p></td>
  52 <td><div class="variablelist"><table border="0" class="variablelist compact">
  53 <colgroup>
  54 <col align="left" valign="top">
  55 <col>
  56 </colgroup>
  57 <tbody>
  58 <tr>
  59 <td><p><span class="term"><code class="computeroutput">context</code></span></p></td>
  60 <td><p>The context in which the expression should be evaluated.</p></td>
  61 </tr>
  62 <tr>
  63 <td><p><span class="term"><code class="computeroutput">expr</code></span></p></td>
  64 <td><p>The Proto expression to evaluate.</p></td>
  65 </tr>
  66 </tbody>
  67 </table></div></td>
  68 </tr>
  69 <tr>
  70 <td><p><span class="term">Returns:</span></p></td>
  71 <td><p>
  72             <code class="computeroutput">typename Context::template eval&lt;Expr&gt;()(expr, context)</code>
  73           </p></td>
  74 </tr>
  75 </tbody>
  76 </table></div>
  77 </div>
  78 </div>
  79 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
  80 <td align="left"></td>
  81 <td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
  82         Distributed under the Boost Software License, Version 1.0. (See accompanying
  83         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>)
  84       </p>
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