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| <a name="boost.proto.lazy.impl"></a><div class="titlepage"></div> |
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| <h2><span class="refentrytitle">Struct template impl</span></h2> |
| <p>boost::proto::lazy::impl</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.transform.lazy_hpp" title="Header <boost/proto/transform/lazy.hpp>">boost/proto/transform/lazy.hpp</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> State<span class="special">,</span> <span class="keyword">typename</span> Data<span class="special">></span> |
| <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><Expr, State, Data> <span class="special">{</span> |
| <span class="comment">// <a class="link" href="impl.html#boost.proto.lazy.impltypes">types</a></span> |
| <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> |
| |
| <span class="comment">// <a class="link" href="impl.html#id1295096-bb">public member functions</a></span> |
| <span class="identifier">result_type</span> <a class="link" href="impl.html#id1295101-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> |
| <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span> |
| <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> |
| <span class="special">}</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="id2439399"></a><h2>Description</h2> |
| <div class="refsect2"> |
| <a name="id2439402"></a><h3> |
| <a name="boost.proto.lazy.impltypes"></a><code class="computeroutput">impl</code> |
| public |
| types</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> |
| <p> |
| <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> |
| <p> |
| <code class="computeroutput"><a class="link" href="../lazy.html" title="Struct template lazy">proto::lazy</a><T>::impl<Expr,State,Data>::result_type</code> |
| is calculated as follows: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"><p> |
| If <code class="computeroutput">T</code> if of the form |
| <code class="computeroutput">O(A<sub>0</sub>,...A<sub>n</sub>)</code>, then let <code class="computeroutput">O'</code> |
| be <code class="computeroutput">boost::result_of<<a class="link" href="../make.html" title="Struct template make">proto::make</a><O>(Expr, State, Data)>::type</code> |
| and let <code class="computeroutput">T'</code> be <code class="computeroutput">O'(A<sub>0</sub>,...A<sub>n</sub>)</code>. |
| </p></li> |
| <li class="listitem"><p> |
| Otherwise, let <code class="computeroutput">T'</code> |
| be <code class="computeroutput">boost::result_of<<a class="link" href="../make.html" title="Struct template make">proto::make</a><T>(Expr, State, Data)>::type</code>. |
| </p></li> |
| </ul></div> |
| <p> |
| </p> |
| <p> |
| The result type is |
| <code class="computeroutput"> |
| boost::result_of<<a class="link" href="../call.html" title="Struct template call">proto::call</a><T'>(Expr, State, Data)>::type |
| </code>. |
| </p> |
| <p> |
| </p> |
| </li></ol></div> |
| </div> |
| <div class="refsect2"> |
| <a name="id2439594"></a><h3> |
| <a name="id1295096-bb"></a><code class="computeroutput">impl</code> public member functions</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> |
| <pre class="literallayout"><span class="identifier">result_type</span> <a name="id1295101-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> |
| <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> |
| <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> |
| <p> |
| <code class="computeroutput"><code class="computeroutput"><a class="link" href="../lazy.html" title="Struct template lazy">proto::lazy</a></code><T>::impl<Expr,State,Data>::operator()</code> behaves as follows: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"><p> |
| If <code class="computeroutput">T</code> if of the form |
| <code class="computeroutput">O(A<sub>0</sub>,...A<sub>n</sub>)</code>, then let <code class="computeroutput">O'</code> |
| be <code class="computeroutput">boost::result_of<<code class="computeroutput"><a class="link" href="../make.html" title="Struct template make">proto::make</a></code><O>(Expr, State, Data)>::type</code> |
| and let <code class="computeroutput">T'</code> be <code class="computeroutput">O'(A<sub>0</sub>,...A<sub>n</sub>)</code>. |
| </p></li> |
| <li class="listitem"><p> |
| Otherwise, let <code class="computeroutput">T'</code> |
| be <code class="computeroutput">boost::result_of<<code class="computeroutput"><a class="link" href="../make.html" title="Struct template make">proto::make</a></code><T>(Expr, State, Data)>::type</code>. |
| </p></li> |
| </ul></div> |
| <p> |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody><tr> |
| <td><p><span class="term">Returns:</span></p></td> |
| <td><p> |
| <code class="computeroutput"> |
| <a class="link" href="../call.html" title="Struct template call">proto::call</a><T'>()(expr, state, data) |
| </code> |
| </p></td> |
| </tr></tbody> |
| </table></div> |
| </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> |
| </div></td> |
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