1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Dereferenceable</title> 5<link rel="stylesheet" href="../../boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../index.html" title="Boost.Python Reference Manual"> 8<link rel="up" href="../concepts.html" title="Chapter 1. Concepts"> 9<link rel="prev" href="../concepts.html" title="Chapter 1. Concepts"> 10<link rel="next" href="extractor.html" title="Extractor"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="" width="" height="" src="../../images/boost.png"></td></tr></table> 14<hr> 15<div class="spirit-nav"> 16<a accesskey="p" href="../concepts.html"><img src="../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.html"><img src="../../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="extractor.html"><img src="../../images/next.png" alt="Next"></a> 17</div> 18<div class="section"> 19<div class="titlepage"><div><div><h2 class="title" style="clear: both"> 20<a name="concepts.dereferenceable"></a><a class="link" href="dereferenceable.html" title="Dereferenceable">Dereferenceable</a> 21</h2></div></div></div> 22<div class="toc"><dl class="toc"> 23<dt><span class="section"><a href="dereferenceable.html#concepts.dereferenceable.introduction">Introduction</a></span></dt> 24<dt><span class="section"><a href="dereferenceable.html#concepts.dereferenceable.concept_requirements">Concept 25 Requirements</a></span></dt> 26</dl></div> 27<div class="section"> 28<div class="titlepage"><div><div><h3 class="title"> 29<a name="concepts.dereferenceable.introduction"></a><a class="link" href="dereferenceable.html#concepts.dereferenceable.introduction" title="Introduction">Introduction</a> 30</h3></div></div></div> 31<p> 32 Instances of a <code class="computeroutput"><span class="identifier">Dereferenceable</span></code> 33 type can be used like a pointer to access an lvalue. 34 </p> 35</div> 36<div class="section"> 37<div class="titlepage"><div><div><h3 class="title"> 38<a name="concepts.dereferenceable.concept_requirements"></a><a class="link" href="dereferenceable.html#concepts.dereferenceable.concept_requirements" title="Concept Requirements">Concept 39 Requirements</a> 40</h3></div></div></div> 41<p> 42 In the table below, <code class="computeroutput"><span class="identifier">T</span></code> is 43 a model of Dereferenceable, and <code class="computeroutput"><span class="identifier">x</span></code> 44 denotes an object of type <code class="computeroutput"><span class="identifier">T</span></code>. 45 In addition, all pointers are <code class="computeroutput"><span class="identifier">Dereferenceable</span></code>. 46 </p> 47<div class="informaltable"><table class="table"> 48<colgroup> 49<col> 50<col> 51<col> 52</colgroup> 53<thead><tr> 54<th> 55 <p> 56 Expression 57 </p> 58 </th> 59<th> 60 <p> 61 Result 62 </p> 63 </th> 64<th> 65 <p> 66 Operational Semantics 67 </p> 68 </th> 69</tr></thead> 70<tbody><tr> 71<td> 72 <p> 73 <code class="computeroutput"><span class="identifier">get_pointer</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> 74 </p> 75 </td> 76<td> 77 <p> 78 convertible to <code class="computeroutput"><span class="identifier">pointee</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span><span class="special">*</span></code> 79 </p> 80 </td> 81<td> 82 <p> 83 <code class="computeroutput"><span class="special">&*</span><span class="identifier">x</span></code>, 84 or a null pointer 85 </p> 86 </td> 87</tr></tbody> 88</table></div> 89</div> 90</div> 91<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 92<td align="left"></td> 93<td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2015 David Abrahams, Stefan Seefeld<p> 94 Distributed under the Boost Software License, Version 1.0. (See accompanying 95 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> 96 </p> 97</div></td> 98</tr></table> 99<hr> 100<div class="spirit-nav"> 101<a accesskey="p" href="../concepts.html"><img src="../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.html"><img src="../../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="extractor.html"><img src="../../images/next.png" alt="Next"></a> 102</div> 103</body> 104</html> 105
