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| <h2><span class="refentrytitle">Struct template compose_generators</span></h2> |
| <p>boost::proto::compose_generators — A composite generator that first applies one transform to an expression and then forwards |
| the result on to another generator for further transformation.</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.generate_hpp" title="Header <boost/proto/generate.hpp>">boost/proto/generate.hpp</a>> |
| |
| </span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> First<span class="special">,</span> <span class="keyword">typename</span> Second<span class="special">></span> |
| <span class="keyword">struct</span> <a class="link" href="compose_generators.html" title="Struct template compose_generators">compose_generators</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">struct</span> <a class="link" href="compose_generators/result_This_Expr__id1264020.html" title="Struct template result<This(Expr)>">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="special">></span> <span class="special">:</span> <span class="keyword"></span> |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span><span class="special"><</span> |
| <span class="identifier">Second</span><span class="special">(</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">First</span><span class="special">(</span><span class="identifier">Expr</span><span class="special">)</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="special">;</span> |
| |
| <span class="comment">// <a class="link" href="compose_generators.html#id1264055-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> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span><span class="special"><</span> |
| <span class="identifier">Second</span><span class="special">(</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">First</span><span class="special">(</span><span class="identifier">Expr</span><span class="special">)</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="identifier">type</span> |
| <a class="link" href="compose_generators.html#id1264060-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="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="id2297908"></a><h2>Description</h2> |
| <p> |
| Generators are intended for use as the first template parameter to the |
| <code class="computeroutput"><a class="link" href="domain.html" title="Struct template domain">proto::domain<></a></code> |
| class template and control if and how expressions within that domain are to be customized. |
| <code class="computeroutput">proto::compose_generators<></code> is a composite generator |
| that first applies one transform to an expression and then forwards the result on to another |
| generator for further transformation. |
| </p> |
| <div class="refsect2"> |
| <a name="id2297940"></a><h3> |
| <a name="id1264055-bb"></a><code class="computeroutput">compose_generators</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> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span><span class="special"><</span> |
| <span class="identifier">Second</span><span class="special">(</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">First</span><span class="special">(</span><span class="identifier">Expr</span><span class="special">)</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="identifier">type</span> |
| <a name="id1264060-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="keyword">const</span> <span class="special">&</span> expr<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> |
| <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">expr</code></span></p></td> |
| <td><p>A Proto expression.</p></td> |
| </tr></tbody> |
| </table></div></td> |
| </tr> |
| <tr> |
| <td><p><span class="term">Returns:</span></p></td> |
| <td><p><code class="computeroutput">Second()(First()(expr))</code></p></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </li></ol></div> |
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| </div> |
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| <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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