49 lines
2.4 KiB
HTML
49 lines
2.4 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Converted with LaTeX2HTML 0.6.5 (Tue Nov 15 1994) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE>28.1.8.2. Standard Metaclasses</TITLE>
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<BODY>
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<meta name="description" value=" Standard Metaclasses">
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<meta name="keywords" value="clm">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<b>Common Lisp the Language, 2nd Edition</b>
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<BR> <HR><A NAME=tex2html5282 HREF="node291.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html5280 HREF="node288.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html5274 HREF="node289.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html5284 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html5285 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html5283 HREF="node291.html"> Standard Meta-objects</A>
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<B>Up:</B> <A NAME=tex2html5281 HREF="node288.html"> Meta-objects</A>
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<B> Previous:</B> <A NAME=tex2html5275 HREF="node289.html"> Metaclasses</A>
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<HR> <P>
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<H3><A NAME=SECTION003218200000000000000>28.1.8.2. Standard Metaclasses</A></H3>
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<P>
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<img align=bottom alt="change_begin" src="gif/change_begin.gif"><br>
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The Common Lisp Object System provides a number of predefined metaclasses. These include the
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classes <tt>standard-class</tt>, <tt>built-in-class</tt>, and
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<tt>structure-class</tt>:
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<P>
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<UL><LI>
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The class <tt>standard-class</tt> is the default class of classes defined
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by <tt>defclass</tt>.
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<P>
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<LI> The class <tt>built-in-class</tt> is the class whose
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instances are classes that have special implementations with
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restricted capabilities. Any class that corresponds to a standard
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Common Lisp type
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might be an instance of <tt>built-in-class</tt>.
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The predefined Common Lisp type specifiers that are required to have
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corresponding classes are listed in table <A HREF="node273.html#CLOSPRECEDENCETABLE">28-1</A>.
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It is implementation-dependent whether each of these classes is implemented as a built-in class.
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<P>
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<LI>
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All classes defined by means of <tt>defstruct</tt> are instances of
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<tt>structure-class</tt>.
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</UL>
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<br><img align=bottom alt="change_end" src="gif/change_end.gif">
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<P>
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<HR>
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<P><ADDRESS>
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AI.Repository@cs.cmu.edu
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</ADDRESS>
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</BODY>
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