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| <div class="refentry"> |
| <a name="boost.proto.functional.eval"></a><div class="titlepage"></div> |
| <div class="refnamediv"> |
| <h2><span class="refentrytitle">Struct eval</span></h2> |
| <p>boost::proto::functional::eval — A <a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> type for evaluating a given Proto |
| expression with a given context.</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.eval_hpp" title="Header <boost/proto/eval.hpp>">boost/proto/eval.hpp</a>> |
| |
| </span> |
| <span class="keyword">struct</span> <a class="link" href="eval.html" title="Struct eval">eval</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="../callable.html" title="Struct callable">proto::callable</a> <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> This<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> Context<span class="special">></span> |
| <span class="keyword">struct</span> <a class="link" href="eval/result_This_Expr__Conte_id1259074.html" title="Struct template result<This(Expr, Context)>">result</a><span class="special"><</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">Context</span><span class="special">)</span><span class="special">></span> <span class="special">:</span> <span class="keyword"></span> |
| <a class="link" href="../result_of/eval.html" title="Struct template eval">proto::result_of::eval</a><span class="special"><</span> |
| <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">remove_reference</span><span class="special"><</span> <span class="identifier">Expr</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span><span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">remove_reference</span><span class="special"><</span> <span class="identifier">Context</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> |
| <span class="special">></span> |
| <span class="special">{</span> |
| <span class="special">}</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="eval.html#id1259118-bb">public member functions</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> Context<span class="special">></span> |
| <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"><</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">Context</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> |
| <a class="link" href="eval.html#id1259123-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">Context</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</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> Context<span class="special">></span> |
| <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"><</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">Context</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> |
| <a class="link" href="eval.html#id1259207-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">Context</span> <span class="keyword">const</span> <span class="special">&</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="id2277785"></a><h2>Description</h2> |
| <div class="refsect2"> |
| <a name="id2277788"></a><h3> |
| <a name="id1259118-bb"></a><code class="computeroutput">eval</code> public member functions</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"> |
| <li class="listitem"> |
| <pre class="literallayout"><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> Context<span class="special">></span> |
| <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"><</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">Context</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> |
| <a name="id1259123-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&</span> expr<span class="special">,</span> <span class="identifier">Context</span> <span class="special">&</span> context<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Evaluate a given Proto expression with a given context. <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">context</code></span></p></td> |
| <td><p>The context in which the expression should be evaluated. </p></td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><code class="computeroutput">expr</code></span></p></td> |
| <td><p>The Proto expression to evaluate.</p></td> |
| </tr> |
| </tbody> |
| </table></div></td> |
| </tr> |
| <tr> |
| <td><p><span class="term">Returns:</span></p></td> |
| <td><p> |
| <code class="computeroutput">typename Context::template eval<Expr>()(expr, context)</code> |
| </p></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><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> Context<span class="special">></span> |
| <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"><</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">Context</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> |
| <a name="id1259207-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&</span> expr<span class="special">,</span> <span class="identifier">Context</span> <span class="keyword">const</span> <span class="special">&</span> context<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> |
| <p> |
| This is an overloaded member function, provided for convenience. It differs from the above |
| function only in what argument(s) it accepts. |
| </p> |
| </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> |
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