1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Struct template impl</title> 6<link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="../../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="../call.html#id-1.3.33.5.44.4.4" title="Description"> 10<link rel="prev" href="../call.html" title="Struct template call"> 11<link rel="next" href="../_default.html" title="Struct template _default"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../boost.png"></td> 16<td align="center"><a 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class="refentrytitle">Struct template impl</span></h2> 30<p>boost::proto::call::impl</p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<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>> 34 35</span> 36<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> 37<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> 38 <span class="comment">// <a class="link" href="impl.html#boost.proto.call.impltypes">types</a></span> 39 <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> 40 41 <span class="comment">// <a class="link" href="impl.html#id-1_3_33_5_42_2_1_1_5_4-bb">public member functions</a></span> 42 <span class="identifier">result_type</span> <a class="link" href="impl.html#id-1_3_33_5_42_2_1_1_5_4_1-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> 43 <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span> 44 <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> 45<span class="special">}</span><span class="special">;</span></pre></div> 46<div class="refsect1"> 47<a name="id-1.3.33.5.44.4.4.4.4"></a><h2>Description</h2> 48<div class="refsect2"> 49<a name="id-1.3.33.5.44.4.4.4.4.2"></a><h3> 50<a name="boost.proto.call.impltypes"></a><code class="computeroutput">impl</code> 51 public 52 types</h3> 53<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 54<p> 55<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> 56<p> 57 In the description that follows, a type <code class="computeroutput">T</code> is determined to model the 58 <a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a> concept if 59 <code class="computeroutput"><a class="link" href="../is_transform.html" title="Struct template is_transform">proto::is_transform</a><T>::value</code> is 60 <code class="computeroutput">true</code>. 61 </p> 62<p> 63 <code class="computeroutput"><a class="link" href="../call.html" title="Struct template call">proto::call</a><T>::impl<Expr,State,Data>::result_type</code> 64 is computed as follows: 65 </p> 66<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 67<li class="listitem"> 68<p> 69 If <code class="computeroutput">T</code> if of the form 70 <code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a></code> or 71 <code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>()</code>, then 72 <code class="computeroutput">result_type</code> is: 73 </p> 74<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> 75<p> 76 </p> 77</li> 78<li class="listitem"> 79<p> 80 If <code class="computeroutput">T</code> is of the form 81 <code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>(A<sub>0</sub>)</code>, then 82 <code class="computeroutput">result_type</code> is: 83 </p> 84<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> 85 <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> 86 <span class="identifier">State</span><span class="special">,</span> 87 <span class="identifier">Data</span> 88<span class="special">)</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span></pre> 89<p> 90 </p> 91</li> 92<li class="listitem"> 93<p> 94 If <code class="computeroutput">T</code> is of the form 95 <code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>(A<sub>0</sub>, A<sub>1</sub>)</code>, then 96 <code class="computeroutput">result_type</code> is: 97 </p> 98<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> 99 <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> 100 <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> 101 <span class="identifier">Data</span> 102<span class="special">)</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span></pre> 103<p> 104 </p> 105</li> 106<li class="listitem"> 107<p> 108 If <code class="computeroutput">T</code> is of the form 109 <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 110 <code class="computeroutput">result_type</code> is: 111 </p> 112<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> 113 <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> 114 <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> 115 <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> 116<span class="special">)</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span></pre> 117<p> 118 </p> 119</li> 120<li class="listitem"> 121<p> 122 If <code class="computeroutput">T</code> is of the form 123 <code class="computeroutput"><a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>(A<sub>0</sub>,…A<sub>n</sub>)</code>, then 124 <code class="computeroutput">result_type</code> is: 125 </p> 126<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> 127 <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> 128 … 129 <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> 130<span class="special">></span><span class="special">::</span><span class="identifier">type</span></pre> 131<p> 132 </p> 133</li> 134<li class="listitem"> 135<p> 136 If <code class="computeroutput">T</code> is of the form 137 <code class="computeroutput"><a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>(A<sub>0</sub>,…A<sub>n</sub> ...)</code>, then 138 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>, 139 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> 140 as described in the reference for <code class="computeroutput"><a class="link" href="../pack.html" title="Struct pack">proto::pack</a></code>. 141 Then, <code class="computeroutput">result_type</code> is: 142 </p> 143<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> 144<p> 145 </p> 146</li> 147</ul></div> 148<p> 149 </p> 150</li></ol></div> 151</div> 152<div class="refsect2"> 153<a name="id-1.3.33.5.44.4.4.4.4.3"></a><h3> 154<a name="id-1_3_33_5_42_2_1_1_5_4-bb"></a><code class="computeroutput">impl</code> public member functions</h3> 155<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 156<pre class="literallayout"><span class="identifier">result_type</span> <a name="id-1_3_33_5_42_2_1_1_5_4_1-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> 157 <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> 158 <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> 159<p> 160 In the description that follows, a type <code class="computeroutput">T</code> is determined to model the 161 <a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a> concept if 162 <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 163 <code class="computeroutput">true</code>. 164 </p> 165<p> 166 <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: 167 </p> 168<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 169<li class="listitem"> 170<p> 171 If <code class="computeroutput">T</code> if of the form 172 <code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a></code> or 173 <code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>()</code>, then 174 return 175 </p> 176<pre class="programlisting">PrimitiveTransform()(expr, state, data)</pre> 177<p> 178 </p> 179</li> 180<li class="listitem"> 181<p> 182 If <code class="computeroutput">T</code> is of the form 183 <code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>(A<sub>0</sub>)</code>, then 184 return 185 </p> 186<pre class="programlisting">PrimitiveTransform()( 187 <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), 188 state, 189 sata 190)</pre> 191<p> 192 </p> 193</li> 194<li class="listitem"> 195<p> 196 If <code class="computeroutput">T</code> is of the form 197 <code class="computeroutput"><a class="link" href="../../../PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a>(A<sub>0</sub>, A<sub>1</sub>)</code>, then 198 return: 199 </p> 200<pre class="programlisting">PrimitiveTransform()( 201 <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), 202 <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), 203 Data 204)</pre> 205<p> 206 </p> 207</li> 208<li class="listitem"> 209<p> 210 If <code class="computeroutput">T</code> is of the form 211 <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 212 return 213 </p> 214<pre class="programlisting">PrimitiveTransform()( 215 <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), 216 <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), 217 <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) 218)</pre> 219<p> 220 </p> 221</li> 222<li class="listitem"> 223<p> 224 If <code class="computeroutput">T</code> is of the form 225 <code class="computeroutput"><a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>(A<sub>0</sub>,…A<sub>n</sub>)</code>, then 226 return: 227 </p> 228<pre class="programlisting">PolymorphicFunctionObject()( 229 <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), 230 ... 231 <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) 232)</pre> 233<p> 234 </p> 235</li> 236<li class="listitem"> 237<p> 238 If <code class="computeroutput">T</code> is of the form 239 <code class="computeroutput"><a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a>(A<sub>0</sub>,…A<sub>n</sub> ...)</code>, then 240 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>, 241 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> 242 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>. 243 Then, return: 244 </p> 245<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> 246<p> 247 </p> 248</li> 249</ul></div> 250<p> 251 </p> 252</li></ol></div> 253</div> 254</div> 255</div> 256<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 257<td align="left"></td> 258<td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p> 259 Distributed under the Boost Software License, Version 1.0. (See accompanying 260 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>) 261 </p> 262</div></td> 263</tr></table> 264<hr> 265<div class="spirit-nav"> 266<a accesskey="p" href="../call.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../call.html#id-1.3.33.5.44.4.4"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../_default.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 267</div> 268</body> 269</html> 270
