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
|
<html><head><title>XLISP :new</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
<hr>
<h1>:new</h1>
<hr>
<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
<td><nobr>Type:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>message selector</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlobj.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(send <i>class</i> :new <i>args</i>)</dt>
<dd><i>class</i> - an existing XLISP class except for <a href="class.htm">class</a><br>
<i>args</i> - the initializing arguments for the new instance<br>
returns - the new class object</dd>
</dl>
<dl>
<dt>(send class :new <i>ivars</i> [<i>cvars</i> [<i>superclass</i>]])</dt>
<dd><i>ivars</i> - list of instance variables for new class<br>
<i>cvars</i> - list of class variable symbols for new class<br>
<i>superclass</i> - superclass for new object, the default is <a href="object.htm">object</a><br>
returns - the new class object</dd>
</dl>
<h2>Description</h2>
<p>The ':new' message selector exhibits two different behaviors. When you
are creating an instance of a <a href="class.htm">class</a> you
only need the ':new' message [consisting of the message selector and any
data]. When you are creating a new <a href="class.htm">class</a>
with ':new', you need to specify instance variables and optionally the
<a href="class.htm">class</a> variables and superclass.</p>
<h2>Examples</h2>
<pre class="example">
(setq new-class (send class :new '(state))) <font color="#008844">; create NEW-CLASS with STATE</font>
(setq new-obj (send new-class :new)) <font color="#008844">; create NEW-OBJ of NEW-CLASS</font>
(send new-obj :show) <font color="#008844">; shows the object</font>
(setq sub-class (send class :new '(sub-state) <font color="#008844">; create SUB-CLASS of NEW-CLASS</font>
'() new-class))
(send sub-class :show) <font color="#008844">; show the SUB-CLASS</font>
</pre>
<p>See the
<a href="../manual/xlisp-man-010.htm#class-new">:new</a>
message selector in the <nobr>XLISP 2.0</nobr> manual.</p>
<p><nobr> <a href="#top">Back to Top</nobr></a></p>
<hr>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
</body></html>
|
