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="../if_.html#id-1.3.33.5.34.6.4" title="Description"> 10<link rel="prev" href="../if_.html" title="Struct template if_"> 11<link rel="next" href="../or_.html" title="Struct template or_"> 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::if_::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.matches_hpp" title="Header <boost/proto/matches.hpp>">boost/proto/matches.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">// types</span> 39 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">if_</span><span class="special"><</span> 40 <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">proto::when</a><span class="special"><</span><a class="link" href="../_.html" title="Struct _">proto::_</a><span class="special">,</span> <span class="identifier">If</span><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> 41 <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">proto::when</a><span class="special"><</span><a class="link" href="../_.html" title="Struct _">proto::_</a><span class="special">,</span> <span class="identifier">Then</span><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> 42 <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">proto::when</a><span class="special"><</span><a class="link" href="../_.html" title="Struct _">proto::_</a><span class="special">,</span> <span class="identifier">Else</span><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> 43 <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="boost.proto.if_.impl.result_type"></a><span class="identifier">result_type</span><span class="special">;</span> 44 45 <span class="comment">// <a class="link" href="impl.html#id-1_3_33_5_32_2_1_3_5_4-bb">public member functions</a></span> 46 <span class="identifier">result_type</span> <a class="link" href="impl.html#id-1_3_33_5_32_2_1_3_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> 47 <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span> 48 <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> 49<span class="special">}</span><span class="special">;</span></pre></div> 50<div class="refsect1"> 51<a name="id-1.3.33.5.34.6.4.6.4"></a><h2>Description</h2> 52<div class="refsect2"> 53<a name="id-1.3.33.5.34.6.4.6.4.2"></a><h3> 54<a name="id-1_3_33_5_32_2_1_3_5_4-bb"></a><code class="computeroutput">impl</code> public member functions</h3> 55<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 56<pre class="literallayout"><span class="identifier">result_type</span> <a name="id-1_3_33_5_32_2_1_3_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> 57 <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> 58 <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> 59<div class="variablelist"><table border="0" class="variablelist compact"> 60<colgroup> 61<col align="left" valign="top"> 62<col> 63</colgroup> 64<tbody> 65<tr> 66<td><p><span class="term">Parameters:</span></p></td> 67<td><div class="variablelist"><table border="0" class="variablelist compact"> 68<colgroup> 69<col align="left" valign="top"> 70<col> 71</colgroup> 72<tbody> 73<tr> 74<td><p><span class="term"><code class="computeroutput">data</code></span></p></td> 75<td><p>A data of arbitrary type </p></td> 76</tr> 77<tr> 78<td><p><span class="term"><code class="computeroutput">expr</code></span></p></td> 79<td><p>An expression </p></td> 80</tr> 81<tr> 82<td><p><span class="term"><code class="computeroutput">state</code></span></p></td> 83<td><p>The current state </p></td> 84</tr> 85</tbody> 86</table></div></td> 87</tr> 88<tr> 89<td><p><span class="term">Returns:</span></p></td> 90<td><p> 91 <code class="computeroutput"><a class="link" href="../when.html" title="Struct template when">proto::when</a><<a class="link" href="../_.html" title="Struct _">proto::_</a>, <em class="replaceable"><code>Then-or-Else</code></em>>()(expr, state, data)</code> 92 </p></td> 93</tr> 94</tbody> 95</table></div> 96</li></ol></div> 97</div> 98</div> 99</div> 100<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 101<td align="left"></td> 102<td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p> 103 Distributed under the Boost Software License, Version 1.0. (See accompanying 104 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>) 105 </p> 106</div></td> 107</tr></table> 108<hr> 109<div class="spirit-nav"> 110<a accesskey="p" href="../if_.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../if_.html#id-1.3.33.5.34.6.4"><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="../or_.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 111</div> 112</body> 113</html> 114
