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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Properties (GNU Octave (version 4.4.1))</title>
<meta name="description" content="Properties (GNU Octave (version 4.4.1))">
<meta name="keywords" content="Properties (GNU Octave (version 4.4.1))">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<link href="index.html#Top" rel="start" title="Top">
<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="classdef-Classes.html#classdef-Classes" rel="up" title="classdef Classes">
<link href="Methods.html#Methods" rel="next" title="Methods">
<link href="Creating-a-classdef-Class.html#Creating-a-classdef-Class" rel="prev" title="Creating a classdef Class">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.indentedblock {margin-right: 0em}
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smalllisp {margin-left: 3.2em}
kbd {font-style: oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
pre.smalldisplay {font-family: inherit; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: inherit; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.nolinebreak {white-space: nowrap}
span.roman {font-family: initial; font-weight: normal}
span.sansserif {font-family: sans-serif; font-weight: normal}
ul.no-bullet {list-style: none}
-->
</style>
<link rel="stylesheet" type="text/css" href="octave.css">
</head>
<body lang="en">
<a name="Properties"></a>
<div class="header">
<p>
Next: <a href="Methods.html#Methods" accesskey="n" rel="next">Methods</a>, Previous: <a href="Creating-a-classdef-Class.html#Creating-a-classdef-Class" accesskey="p" rel="prev">Creating a classdef Class</a>, Up: <a href="classdef-Classes.html#classdef-Classes" accesskey="u" rel="up">classdef Classes</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Properties-3"></a>
<h4 class="subsection">34.6.2 Properties</h4>
<p>All class properties must be defined within <code>properties</code> blocks. The
definition of a default value for a property is optional and can be omitted.
The default initial value for each class property is <code>[]</code>.
</p>
<p>A <code>properties</code> block can have additional attributes to specify access
rights or to define constants:
</p>
<div class="example">
<pre class="example">classdef some_class
properties (Access = <var>mode</var>)
<var>prop1</var>
endproperties
properties (SetAccess = <var>mode</var>, GetAccess = <var>mode</var>)
<var>prop2</var>
endproperties
properties (Constant = true)
<var>prop3</var> = pi ()
endproperties
properties
<var>prop4</var> = 1337
endproperties
endclassdef
</pre></div>
<p>where <var>mode</var> can be one of:
</p>
<dl compact="compact">
<dt><code>public</code></dt>
<dd><p>The properties can be accessed from everywhere.
</p>
</dd>
<dt><code>private</code></dt>
<dd><p>The properties can only be accessed from class methods. Subclasses of that
class cannot access them.
</p>
</dd>
<dt><code>protected</code></dt>
<dd><p>The properties can only be accessed from class methods and from subclasses
of that class.
</p></dd>
</dl>
<p>When creating an object of <code>some_class</code>, <var>prop1</var> has the default
value <code>[]</code> and reading from and writing to <var>prop1</var> is defined by
a single <var>mode</var>. For <var>prop2</var> the read and write access can be set
differently. Finally, <var>prop3</var> is a constant property which can only be
initialized once within the <code>properties</code> block.
</p>
<p>By default, in the example <var>prop4</var>, properties are not constant and have
public read and write access.
</p>
</body>
</html>
|
