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
|
<html><head><title>XLISP type-of</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>type-of</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>function (subr)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlsys.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(type-of <i>expr</i>)</dt>
<dd><i>expr</i> - an expression to check<br>
returns - the type of the expression</dd>
</dl>
<h2>Description</h2>
<p>The 'type-of' function returns the type of the expression.</p>
<ul>
<li><nobr>SYMBOL - for symbols</nobr></li>
<li><nobr>OBJECT - for objects</nobr></li>
<li><nobr>CONS - for conses</nobr></li>
<li><nobr>SUBR - for built-in functions</nobr></li>
<li><nobr>FSUBR - for special forms</nobr></li>
<li><nobr>CLOSURE - for defined functions</nobr></li>
<li><nobr>STRING - for strings</nobr></li>
<li><nobr>FIXNUM - for integers</nobr></li>
<li><nobr>FLONUM - for floating point numbers</nobr></li>
<li><nobr>CHARACTER - for characters</nobr></li>
<li><nobr>FILE-STREAM - for file pointers</nobr></li>
<li><nobr>UNNAMED-STREAM - for unnamed streams</nobr></li>
<li><nobr>ARRAY - for arrays</nobr></li>
</ul>
<h2>Examples</h2>
<pre class="example">
(type-of NIL) <font color="#008844">; returns NIL</font>
(type-of '#(1 2 3)) <font color="#008844">; returns ARRAY</font>
(type-of (lambda (x) (print x))) <font color="#008844">; returns CLOSURE</font>
(type-of '(a b)) <font color="#008844">; returns CONS</font>
(type-of #'savefun) <font color="#008844">; returns CLOSURE</font>
(type-of '(a . b)) <font color="#008844">; returns CONS</font>
(type-of *standard-output*) <font color="#008844">; returns FILE-STREAM</font>
(type-of 1.2) <font color="#008844">; returns FLONUM</font>
(type-of #'do) <font color="#008844">; returns FSUBR</font>
(type-of 1) <font color="#008844">; returns FIXNUM</font>
(type-of object) <font color="#008844">; returns OBJECT</font>
(type-of "str") <font color="#008844">; returns STRING</font>
(type-of #'car) <font color="#008844">; returns SUBR</font>
(type-of 'a) <font color="#008844">; returns SYMBOL</font>
(type-of #\a) <font color="#008844">; returns CHARACTER</font>
(type-of (make-string-input-stream "a")) <font color="#008844">; returns UNNAMED-STREAM</font>
</pre>
<p><b>Common Lisp:</b> The XLISP and Common Lisp 'type-of' functions are
basically the same. Differences between the two can occur in what the types
are called [like CHARACTER in XLISP and STANDARD-CHAR in Common Lisp]. Also,
Common Lisp can give additional information. For strings, it returns a list
of the form (SIMPLE-STRING 32) where the number 32 is the string size.</p>
<p>See the
<a href="../manual/xlisp-man-031.htm#type-of">type-of</a>
function 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>
|
