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<div class="refentry">
<a name="boost.proto.call.impl"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Struct template impl</span></h2>
<p>boost::proto::call::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.call_hpp" title="Header <boost/proto/transform/call.hpp>">boost/proto/transform/call.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.call.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.call.impl.result_type"><span class="identifier">result_type</span></a><span class="special">;</span>
<span class="comment">// <a class="link" href="impl.html#idm45506990635264-bb">public member functions</a></span>
<span class="identifier">result_type</span> <a class="link" href="impl.html#idm45506990634704-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="idm45555174135328"></a><h2>Description</h2>
<div class="refsect2">
<a name="idm45555174134912"></a><h3>
<a name="boost.proto.call.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.call.impl.result_type"></a><span class="identifier">result_type</span><span class="special">;</span></p>
<p>
In the description that follows, a type <code class="computeroutput">T</code> is determined to model the
<a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a> concept if
<code class="computeroutput"><a class="link" href="../is_transform.html" title="Struct template is_transform">proto::is_transform</a><T>::value</code> is
<code class="computeroutput">true</code>.
</p>
<p>
<code class="computeroutput"><a class="link" href="../call.html" title="Struct template call">proto::call</a><T>::impl<Expr,State,Data>::result_type</code>
is computed 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"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a></code> or
<code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>()</code>, then
<code class="computeroutput">result_type</code> is:
</p>
<pre class="programlisting"><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">PrimitiveTransform</span><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</span><span class="special">)</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span></pre>
<p>
</p>
</li>
<li class="listitem">
<p>
If <code class="computeroutput">T</code> is of the form
<code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>(A<sub>0</sub>)</code>, then
<code class="computeroutput">result_type</code> is:
</p>
<pre class="programlisting"><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">PrimitiveTransform</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><a class="link" href="../when.html" title="Struct template when">when</a><span class="special"><</span><a class="link" href="../_.html" title="Struct _">_</a><span class="special">,</span><span class="identifier">A</span><sub><span class="number">0</span></sub><span class="special">></span><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</span><span class="special">)</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span><span class="special">,</span>
<span class="identifier">State</span><span class="special">,</span>
<span class="identifier">Data</span>
<span class="special">)</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span></pre>
<p>
</p>
</li>
<li class="listitem">
<p>
If <code class="computeroutput">T</code> is of the form
<code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>(A<sub>0</sub>, A<sub>1</sub>)</code>, then
<code class="computeroutput">result_type</code> is:
</p>
<pre class="programlisting"><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">PrimitiveTransform</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><a class="link" href="../when.html" title="Struct template when">when</a><span class="special"><</span><a class="link" href="../_.html" title="Struct _">_</a><span class="special">,</span><span class="identifier">A</span><sub><span class="number">0</span></sub><span class="special">></span><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</span><span class="special">)</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">result_of</span><span class="special"><</span><a class="link" href="../when.html" title="Struct template when">when</a><span class="special"><</span><a class="link" href="../_.html" title="Struct _">_</a><span class="special">,</span><span class="identifier">A</span><sub><span class="number">1</span></sub><span class="special">></span><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</span><span class="special">)</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span><span class="special">,</span>
<span class="identifier">Data</span>
<span class="special">)</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span></pre>
<p>
</p>
</li>
<li class="listitem">
<p>
If <code class="computeroutput">T</code> is of the form
<code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>(A<sub>0</sub>, A<sub>1</sub>, A<sub>2</sub>)</code>, then
<code class="computeroutput">result_type</code> is:
</p>
<pre class="programlisting"><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">PrimitiveTransform</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><a class="link" href="../when.html" title="Struct template when">when</a><span class="special"><</span><a class="link" href="../_.html" title="Struct _">_</a><span class="special">,</span><span class="identifier">A</span><sub><span class="number">0</span></sub><span class="special">></span><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</span><span class="special">)</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">result_of</span><span class="special"><</span><a class="link" href="../when.html" title="Struct template when">when</a><span class="special"><</span><a class="link" href="../_.html" title="Struct _">_</a><span class="special">,</span><span class="identifier">A</span><sub><span class="number">1</span></sub><span class="special">></span><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</span><span class="special">)</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">result_of</span><span class="special"><</span><a class="link" href="../when.html" title="Struct template when">when</a><span class="special"><</span><a class="link" href="../_.html" title="Struct _">_</a><span class="special">,</span><span class="identifier">A</span><sub><span class="number">2</span></sub><span class="special">></span><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</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></pre>
<p>
</p>
</li>
<li class="listitem">
<p>
If <code class="computeroutput">T</code> is of the form
<code class="computeroutput"><a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>(A<sub>0</sub>,…A<sub>n</sub>)</code>, then
<code class="computeroutput">result_type</code> is:
</p>
<pre class="programlisting"><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">PolymorphicFunctionObject</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><a class="link" href="../when.html" title="Struct template when">when</a><span class="special"><</span><a class="link" href="../_.html" title="Struct _">_</a><span class="special">,</span><span class="identifier">A</span><sub><span class="number">0</span></sub><span class="special">></span><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</span><span class="special">)</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">result_of</span><span class="special"><</span><a class="link" href="../when.html" title="Struct template when">when</a><span class="special"><</span><a class="link" href="../_.html" title="Struct _">_</a><span class="special">,</span><span class="identifier">A</span><sub><span class="identifier">n</span></sub><span class="special">></span><span class="special">(</span><span class="identifier">Expr</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">Data</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="identifier">type</span></pre>
<p>
</p>
</li>
<li class="listitem">
<p>
If <code class="computeroutput">T</code> is of the form
<code class="computeroutput"><a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>(A<sub>0</sub>,…A<sub>n</sub> ...)</code>, then
let <code class="computeroutput">T'</code> be <code class="computeroutput"><a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>(A<sub>0</sub>,…A<sub>n-1</sub>, <em class="replaceable"><code>S</code></em>)</code>,
where <em class="replaceable"><code>S</code></em> is a type sequence computed from the unpacking expression <code class="computeroutput">A<sub>n</sub></code>
as described in the reference for <code class="computeroutput"><a class="link" href="../pack.html" title="Struct pack">proto::pack</a></code>.
Then, <code class="computeroutput">result_type</code> is:
</p>
<pre class="programlisting"><code class="computeroutput"><span class="keyword">typename</span> <a class="link" href="../call.html" title="Struct template call">proto::call</a><span class="special"><</span><span class="identifier">T</span><span class="char">'>::impl<Expr,State,Data>::result_type</span></code></pre>
<p>
</p>
</li>
</ul></div>
<p>
</p>
</li></ol></div>
</div>
<div class="refsect2">
<a name="idm45555173939104"></a><h3>
<a name="idm45506990635264-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="idm45506990634704-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>
In the description that follows, a type <code class="computeroutput">T</code> is determined to model the
<a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a> concept if
<code class="computeroutput"><code class="computeroutput"><a class="link" href="../is_transform.html" title="Struct template is_transform">proto::is_transform</a></code><T>::value</code> is
<code class="computeroutput">true</code>.
</p>
<p>
<code class="computeroutput"><code class="computeroutput"><a class="link" href="../call.html" title="Struct template call">proto::call</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"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a></code> or
<code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>()</code>, then
return
</p>
<pre class="programlisting">PrimitiveTransform()(expr, state, data)</pre>
<p>
</p>
</li>
<li class="listitem">
<p>
If <code class="computeroutput">T</code> is of the form
<code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>(A<sub>0</sub>)</code>, then
return
</p>
<pre class="programlisting">PrimitiveTransform()(
<code class="computeroutput"><a class="link" href="../when.html" title="Struct template when">when</a></code><<code class="computeroutput"><a class="link" href="../_.html" title="Struct _">_</a></code>,A<sub>0</sub>>()(expr, state, data),
state,
sata
)</pre>
<p>
</p>
</li>
<li class="listitem">
<p>
If <code class="computeroutput">T</code> is of the form
<code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>(A<sub>0</sub>, A<sub>1</sub>)</code>, then
return:
</p>
<pre class="programlisting">PrimitiveTransform()(
<code class="computeroutput"><a class="link" href="../when.html" title="Struct template when">when</a></code><<code class="computeroutput"><a class="link" href="../_.html" title="Struct _">_</a></code>,A<sub>0</sub>>()(expr, state, data),
<code class="computeroutput"><a class="link" href="../when.html" title="Struct template when">when</a></code><<code class="computeroutput"><a class="link" href="../_.html" title="Struct _">_</a></code>,A<sub>1</sub>>()(expr, state, data),
Data
)</pre>
<p>
</p>
</li>
<li class="listitem">
<p>
If <code class="computeroutput">T</code> is of the form
<code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>(A<sub>0</sub>, A<sub>1</sub>, A<sub>2</sub>)</code>, then
return
</p>
<pre class="programlisting">PrimitiveTransform()(
<code class="computeroutput"><a class="link" href="../when.html" title="Struct template when">when</a></code><<code class="computeroutput"><a class="link" href="../_.html" title="Struct _">_</a></code>,A<sub>0</sub>>()(expr, state, data),
<code class="computeroutput"><a class="link" href="../when.html" title="Struct template when">when</a></code><<code class="computeroutput"><a class="link" href="../_.html" title="Struct _">_</a></code>,A<sub>1</sub>>()(expr, state, data),
<code class="computeroutput"><a class="link" href="../when.html" title="Struct template when">when</a></code><<code class="computeroutput"><a class="link" href="../_.html" title="Struct _">_</a></code>,A<sub>2</sub>>()(expr, state, data)
)</pre>
<p>
</p>
</li>
<li class="listitem">
<p>
If <code class="computeroutput">T</code> is of the form
<code class="computeroutput"><a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>(A<sub>0</sub>,…A<sub>n</sub>)</code>, then
return:
</p>
<pre class="programlisting">PolymorphicFunctionObject()(
<code class="computeroutput"><a class="link" href="../when.html" title="Struct template when">when</a></code><<code class="computeroutput"><a class="link" href="../_.html" title="Struct _">_</a></code>,A<sub>0</sub>>()(expr, state, data),
...
<code class="computeroutput"><a class="link" href="../when.html" title="Struct template when">when</a></code><<code class="computeroutput"><a class="link" href="../_.html" title="Struct _">_</a></code>,A<sub>n</sub>>()(expr, state, data)
)</pre>
<p>
</p>
</li>
<li class="listitem">
<p>
If <code class="computeroutput">T</code> is of the form
<code class="computeroutput"><a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>(A<sub>0</sub>,…A<sub>n</sub> ...)</code>, then
let <code class="computeroutput">T'</code> be <code class="computeroutput"><a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>(A<sub>0</sub>,…A<sub>n-1</sub>, <em class="replaceable"><code>S</code></em>)</code>,
where <em class="replaceable"><code>S</code></em> is a type sequence computed from the unpacking expression <code class="computeroutput">A<sub>n</sub></code>
as described in the reference for <code class="computeroutput"><code class="computeroutput"><a class="link" href="../pack.html" title="Struct pack">proto::pack</a></code></code>.
Then, return:
</p>
<pre class="programlisting"><code class="computeroutput"><code class="computeroutput"><a class="link" href="../call.html" title="Struct template call">proto::call</a></code><T'>()(expr, state, data)</code></pre>
<p>
</p>
</li>
</ul></div>
<p>
</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>
</div></td>
</tr></table>
<hr>
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