42 lines
2.4 KiB
HTML
42 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>28.1.10.3. Customizing Class Redefinition</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value=" Customizing Class Redefinition">
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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=tex2html5445 HREF="node304.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html5443 HREF="node300.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html5437 HREF="node302.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html5447 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html5448 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html5446 HREF="node304.html"> Extensions</A>
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<B>Up:</B> <A NAME=tex2html5444 HREF="node300.html"> Redefining Classes</A>
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<B> Previous:</B> <A NAME=tex2html5438 HREF="node302.html"> Initializing Newly Added </A>
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<HR> <P>
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<H3><A NAME=SECTION0032110300000000000000>28.1.10.3. Customizing Class Redefinition</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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Methods for <tt>update-instance-for-redefined-class</tt> may be defined
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to specify actions to be taken when an instance is updated. If only
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<tt>:after</tt> methods for <tt>update-instance-for-redefined-class</tt> are
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defined, they will be run after the system-supplied primary method for
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initialization and therefore will not interfere with the default
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behavior of <tt>update-instance-for-redefined-class</tt>. Because no
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initialization arguments are passed to
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<tt>update-instance-for-redefined-class</tt> when it is called by the system,
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the <tt>:initform</tt> forms for slots that are filled by <tt>:before</tt>
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methods for <tt>update-instance-for-redefined-class</tt> will not be
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evaluated by <tt>shared-initialize</tt>.
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<P>
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Methods for <tt>shared-initialize</tt> may be defined to customize class
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redefinition (see section <A HREF="node297.html#SharedInitializeSECTION">28.1.9.5</A>).
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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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