31 lines
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31 lines
4.1 KiB
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<TITLE>CLHS: Section 4.3.6.1</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_cf.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_cfb.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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4.3.6.1 Modifying the Structure of Instances</H2> <P>
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The first step modifies the structure of <A REL=DEFINITION HREF="26_glo_i.htm#instance"><I>instances</I></A> of the redefined <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> to conform to its new <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> definition. <A REL=DEFINITION HREF="26_glo_l.htm#local_slot"><I>Local slots</I></A> specified by the new <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> definition that are not specified as either local or shared by the old <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> are added, and <A REL=DEFINITION HREF="26_glo_s.htm#slot"><I>slots</I></A> not specified as either local or shared by the new <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> definition that are specified as local by the old <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> are discarded. The <A REL=DEFINITION HREF="26_glo_n.htm#name"><I>names</I></A> of these added and discarded <A REL=DEFINITION HREF="26_glo_s.htm#slot"><I>slots</I></A> are passed as arguments to <A REL=DEFINITION HREF="f_upda_1.htm#update-instance-for-redefined-class"><B>update-instance-for-redefined-class</B></A> as described in the next section. <P>
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The values of <A REL=DEFINITION HREF="26_glo_l.htm#local_slot"><I>local slots</I></A> specified by both the new and old <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>classes</I></A> are retained. If such a <A REL=DEFINITION HREF="26_glo_l.htm#local_slot"><I>local slot</I></A> was unbound, it remains unbound. <P>
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The value of a <A REL=DEFINITION HREF="26_glo_s.htm#slot"><I>slot</I></A> that is specified as shared in the old <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> and as local in the new <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> is retained. If such a <A REL=DEFINITION HREF="26_glo_s.htm#shared_slot"><I>shared slot</I></A> was unbound, the <A REL=DEFINITION HREF="26_glo_l.htm#local_slot"><I>local slot</I></A> is unbound. <P>
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<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
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