libs/python/doc/html/reference/concepts/dereferenceable.html


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Dereferenceable</title>
<link rel="stylesheet" href="../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
<link rel="home" href="../index.html" title="Boost.Python Reference Manual">
<link rel="up" href="../concepts.html" title="Chapter&#160;1.&#160;Concepts">
<link rel="prev" href="../concepts.html" title="Chapter&#160;1.&#160;Concepts">
<link rel="next" href="extractor.html" title="Extractor">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="" width="" height="" src="../../images/boost.png"></td></tr></table>
<hr>
<div class="spirit-nav">
<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>
</div>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="concepts.dereferenceable"></a><a class="link" href="dereferenceable.html" title="Dereferenceable">Dereferenceable</a>
</h2></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="section"><a href="dereferenceable.html#concepts.dereferenceable.introduction">Introduction</a></span></dt>
<dt><span class="section"><a href="dereferenceable.html#concepts.dereferenceable.concept_requirements">Concept
        Requirements</a></span></dt>
</dl></div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="concepts.dereferenceable.introduction"></a><a class="link" href="dereferenceable.html#concepts.dereferenceable.introduction" title="Introduction">Introduction</a>
</h3></div></div></div>
<p>
          Instances of a <code class="computeroutput"><span class="identifier">Dereferenceable</span></code>
          type can be used like a pointer to access an lvalue.
        </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="concepts.dereferenceable.concept_requirements"></a><a class="link" href="dereferenceable.html#concepts.dereferenceable.concept_requirements" title="Concept Requirements">Concept
        Requirements</a>
</h3></div></div></div>
<p>
          In the table below, <code class="computeroutput"><span class="identifier">T</span></code> is
          a model of Dereferenceable, and <code class="computeroutput"><span class="identifier">x</span></code>
          denotes an object of type <code class="computeroutput"><span class="identifier">T</span></code>.
          In addition, all pointers are <code class="computeroutput"><span class="identifier">Dereferenceable</span></code>.
        </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                  <p>
                    Expression
                  </p>
                </th>
<th>
                  <p>
                    Result
                  </p>
                </th>
<th>
                  <p>
                    Operational Semantics
                  </p>
                </th>
</tr></thead>
<tbody><tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">get_pointer</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code>
                  </p>
                </td>
<td>
                  <p>
                    convertible to <code class="computeroutput"><span class="identifier">pointee</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">*</span></code>
                  </p>
                </td>
<td>
                  <p>
                    <code class="computeroutput"><span class="special">&amp;*</span><span class="identifier">x</span></code>,
                    or a null pointer
                  </p>
                </td>
</tr></tbody>
</table></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 &#169; 2002-2005, 2015 David Abrahams, Stefan Seefeld<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>
<div class="spirit-nav">
<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>
</div>
</body>
</html>