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30 lines
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<TITLE>CLHS: Section 4.3.6.3</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="04_cfb.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="04_cf.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="04_cg.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>
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4.3.6.3 Customizing Class Redefinition</H2> <P>
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<A REL=DEFINITION HREF="26_glo_m.htm#method"><I>Methods</I></A> for <A REL=DEFINITION HREF="f_upda_1.htm#update-instance-for-redefined-class"><B>update-instance-for-redefined-class</B></A> may be defined to specify actions to be taken when an <A REL=DEFINITION HREF="26_glo_i.htm#instance"><I>instance</I></A> is updated. If only <A REL=DEFINITION HREF="26_glo_a.htm#after_method"><I>after methods</I></A> for <A REL=DEFINITION HREF="f_upda_1.htm#update-instance-for-redefined-class"><B>update-instance-for-redefined-class</B></A> are defined, they will be run after the system-supplied primary <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>method</I></A> for initialization and therefore will not interfere with the default behavior of <A REL=DEFINITION HREF="f_upda_1.htm#update-instance-for-redefined-class"><B>update-instance-for-redefined-class</B></A>. Because no initialization arguments are passed to <A REL=DEFINITION HREF="f_upda_1.htm#update-instance-for-redefined-class"><B>update-instance-for-redefined-class</B></A> when it is called by the system, the <A REL=DEFINITION HREF="26_glo_i.htm#initialization_form"><I>initialization forms</I></A> for <A REL=DEFINITION HREF="26_glo_s.htm#slot"><I>slots</I></A> that are filled by <A REL=DEFINITION HREF="26_glo_b.htm#before_method"><I>before methods</I></A> for <A REL=DEFINITION HREF="f_upda_1.htm#update-instance-for-redefined-class"><B>update-instance-for-redefined-class</B></A> will not be evaluated by <A REL=DEFINITION HREF="f_shared.htm#shared-initialize"><B>shared-initialize</B></A>. <P>
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<A REL=DEFINITION HREF="26_glo_m.htm#method"><I>Methods</I></A> for <A REL=DEFINITION HREF="f_shared.htm#shared-initialize"><B>shared-initialize</B></A> may be defined to customize <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> redefinition. For more information, see <A REL=CHILD HREF="07_ae.htm">Section 7.1.5 (Shared-Initialize)</A>. <P>
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