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<div class="refentry">
<a name="boost.proto.lazy.impl"></a><div class="titlepage"></div>
<div class="refnamediv">
<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#idp705489136-bb">public member functions</a></span>
<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>
<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="idp483530416"></a><h2>Description</h2>
<div class="refsect2">
<a name="idp483530832"></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" style="list-style-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>
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="idp483560576"></a><h3>
<a name="idp705489136-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="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>
<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" style="list-style-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>
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" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<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>
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