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<html><head><title>XLISP :class</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
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<a href="reference-index.htm">Reference</a>
<hr>
<h1>:class</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>object</i> :class)</dt>
<dd><i>object</i> - an existing <a href="object.htm">object</a><br>
returns the <a href="class.htm">class</a> object</dd>
</dl>
<h2>Description</h2>
<p>The ':class' message selector will cause a method to run that will return the
object which is the class of the specified 'object'. Note that the
returned value is an object which will look like:</p>
<pre class="example">
#<Object: #18d8c>
</pre>
<p>The 'object' must exist or an error will be generated:</p>
<pre class="example">
<font color="#AA0000">error: bad argument type</font>
</pre>
<h2>Examples</h2>
<pre class="example">
(send object :class) <font color="#008844">; returns the CLASS object</font>
(send class :class) <font color="#008844">; returns the CLASS object</font>
(setq new-cls (send class :new '(var))) <font color="#008844">; create NEW-CLS</font>
(setq new-obj (send new-cls :new)) <font color="#008844">; create NEW-OBJ of NEW-CLS</font>
(send new-obj :class) <font color="#008844">; returns the NEW-CLS object</font>
(send new-cls :class) <font color="#008844">; returns the CLASS object</font>
</pre>
<p>See the
<a href="../manual/xlisp-man-010.htm#object-class">:class</a>
message selector in the <nobr>XLISP 2.0</nobr> manual.</p>
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