1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>deref_data</title> 5<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../index.html" title="Chapter 1. Fusion 2.2"> 8<link rel="up" href="../functions.html" title="Functions"> 9<link rel="prev" href="advance_c.html" title="advance_c"> 10<link rel="next" href="../operator.html" title="Operator"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="advance_c.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><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="../operator.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 27<a name="fusion.iterator.functions.deref_data"></a><a class="link" href="deref_data.html" title="deref_data">deref_data</a> 28</h4></div></div></div> 29<h6> 30<a name="fusion.iterator.functions.deref_data.h0"></a> 31 <span class="phrase"><a name="fusion.iterator.functions.deref_data.description"></a></span><a class="link" href="deref_data.html#fusion.iterator.functions.deref_data.description">Description</a> 32 </h6> 33<p> 34 Deferences the data property associated with the element referenced by 35 an associative iterator. 36 </p> 37<h6> 38<a name="fusion.iterator.functions.deref_data.h1"></a> 39 <span class="phrase"><a name="fusion.iterator.functions.deref_data.synopsis"></a></span><a class="link" href="deref_data.html#fusion.iterator.functions.deref_data.synopsis">Synopsis</a> 40 </h6> 41<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> 42 <span class="keyword">typename</span> <span class="identifier">I</span> 43 <span class="special">></span> 44<span class="keyword">typename</span> <a class="link" href="../metafunctions/deref_data.html" title="deref_data"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref_data</span></code></a><span class="special"><</span><span class="identifier">I</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">deref_data</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">i</span><span class="special">);</span> 45</pre> 46<div class="table"> 47<a name="fusion.iterator.functions.deref_data.t0"></a><p class="title"><b>Table 1.7. Parameters</b></p> 48<div class="table-contents"><table class="table" summary="Parameters"> 49<colgroup> 50<col> 51<col> 52<col> 53</colgroup> 54<thead><tr> 55<th> 56 <p> 57 Parameter 58 </p> 59 </th> 60<th> 61 <p> 62 Requirement 63 </p> 64 </th> 65<th> 66 <p> 67 Description 68 </p> 69 </th> 70</tr></thead> 71<tbody><tr> 72<td> 73 <p> 74 <code class="computeroutput"><span class="identifier">i</span></code> 75 </p> 76 </td> 77<td> 78 <p> 79 Model of <a class="link" href="../concepts/associative_iterator.html" title="Associative Iterator">Associative 80 Iterator</a> 81 </p> 82 </td> 83<td> 84 <p> 85 Operation's argument 86 </p> 87 </td> 88</tr></tbody> 89</table></div> 90</div> 91<br class="table-break"><h6> 92<a name="fusion.iterator.functions.deref_data.h2"></a> 93 <span class="phrase"><a name="fusion.iterator.functions.deref_data.expression_semantics"></a></span><a class="link" href="deref_data.html#fusion.iterator.functions.deref_data.expression_semantics">Expression 94 Semantics</a> 95 </h6> 96<pre class="programlisting"><a class="link" href="deref_data.html" title="deref_data"><code class="computeroutput"><span class="identifier">deref_data</span></code></a><span class="special">(</span><span class="identifier">i</span><span class="special">);</span> 97</pre> 98<p> 99 <span class="bold"><strong>Return type</strong></span>: <code class="computeroutput"><a class="link" href="../metafunctions/deref_data.html" title="deref_data"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref_data</span></code></a><span class="special"><</span><span class="identifier">I</span><span class="special">>::</span><span class="identifier">type</span></code> 100 </p> 101<p> 102 <span class="bold"><strong>Semantics</strong></span>: Dereferences the data property 103 associated with the element referenced by an associative iterator <code class="computeroutput"><span class="identifier">i</span></code>. 104 </p> 105<h6> 106<a name="fusion.iterator.functions.deref_data.h3"></a> 107 <span class="phrase"><a name="fusion.iterator.functions.deref_data.header"></a></span><a class="link" href="deref_data.html#fusion.iterator.functions.deref_data.header">Header</a> 108 </h6> 109<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">deref_data</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 110<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">deref_data</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 111</pre> 112<h6> 113<a name="fusion.iterator.functions.deref_data.h4"></a> 114 <span class="phrase"><a name="fusion.iterator.functions.deref_data.example"></a></span><a class="link" href="deref_data.html#fusion.iterator.functions.deref_data.example">Example</a> 115 </h6> 116<pre class="programlisting"><span class="keyword">typedef</span> <a class="link" href="../../container/map.html" title="map"><code class="computeroutput"><span class="identifier">map</span></code></a><span class="special"><</span><a class="link" href="../../support/pair.html" title="pair"><code class="computeroutput"><span class="identifier">pair</span></code></a><span class="special"><</span><span class="keyword">float</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&></span> <span class="special">></span> <span class="identifier">map</span><span class="special">;</span> 117 118<span class="keyword">int</span> <span class="identifier">i</span><span class="special">(</span><span class="number">0</span><span class="special">);</span> 119<span class="identifier">map</span> <span class="identifier">m</span><span class="special">(</span><span class="number">1.0f</span><span class="special">,</span><span class="identifier">i</span><span class="special">);</span> 120<span class="identifier">assert</span><span class="special">(</span><a class="link" href="deref_data.html" title="deref_data"><code class="computeroutput"><span class="identifier">deref_data</span></code></a><span class="special">(</span><a class="link" href="../../sequence/intrinsic/functions/begin.html" title="begin"><code class="computeroutput"><span class="identifier">begin</span></code></a><span class="special">(</span><span class="identifier">m</span><span class="special">))</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 121<span class="identifier">assert</span><span class="special">(&(</span><a class="link" href="deref_data.html" title="deref_data"><code class="computeroutput"><span class="identifier">deref_data</span></code></a><span class="special">(</span><a class="link" href="../../sequence/intrinsic/functions/begin.html" title="begin"><code class="computeroutput"><span class="identifier">begin</span></code></a><span class="special">(</span><span class="identifier">m</span><span class="special">)))</span> <span class="special">==</span> <span class="special">&</span><span class="identifier">i</span><span class="special">);</span> 122</pre> 123</div> 124<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 125<td align="left"></td> 126<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman, 127 Dan Marsden, Tobias Schwinger<p> 128 Distributed under the Boost Software License, Version 1.0. (See accompanying 129 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>) 130 </p> 131</div></td> 132</tr></table> 133<hr> 134<div class="spirit-nav"> 135<a accesskey="p" href="advance_c.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><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="../operator.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 136</div> 137</body> 138</html> 139
