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57 lines
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<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
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<TITLE>CLHS: Standard Generic Function INITIALIZE-INSTANCE</TITLE>
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<A NAME="initialize-instance"><I>Standard Generic Function</I> <B>INITIALIZE-INSTANCE</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>initialize-instance</B> <I>instance <TT>&rest</TT> initargs <TT>&key</TT> <TT>&allow-other-keys</TT></I> => <I>instance</I><P>
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<P>
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<P><B>Method Signatures:</B><P>
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<P>
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<B>initialize-instance</B> <I>(<I>instance</I><B> <A REL=DEFINITION HREF="t_std_ob.htm#standard-object">standard-object</A></B>) <TT>&rest</TT> initargs</I><P>
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<P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>instance</I>---an <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A>. <P>
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<I>initargs</I>---a <A REL=DEFINITION HREF="26_glo_d.htm#defaulted_initialization_argument_list"><I>defaulted initialization argument list</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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Called by <A REL=DEFINITION HREF="f_mk_ins.htm#make-instance"><B>make-instance</B></A> to initialize a newly created <A REL=DEFINITION HREF="26_glo_i.htm#instance"><I>instance</I></A>. The generic function is called with the new <I>instance</I> and the <A REL=DEFINITION HREF="26_glo_d.htm#defaulted_initialization_argument_list"><I>defaulted initialization argument list</I></A>. <P>
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The system-supplied primary <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>method</I></A> on <A REL=DEFINITION HREF="#initialize-instance"><B>initialize-instance</B></A> initializes the <A REL=DEFINITION HREF="26_glo_s.htm#slot"><I>slots</I></A> of the <I>instance</I> with values according to the <I>initargs</I> and the <TT>:initform</TT> forms of the <A REL=DEFINITION HREF="26_glo_s.htm#slot"><I>slots</I></A>. It does this by calling the generic function <A REL=DEFINITION HREF="f_shared.htm#shared-initialize"><B>shared-initialize</B></A> with the following arguments: the <I>instance</I>, <A REL=DEFINITION HREF="a_t.htm#t"><B>t</B></A> (this indicates that all <A REL=DEFINITION HREF="26_glo_s.htm#slot"><I>slots</I></A> for which no initialization arguments are provided should be initialized according to their <TT>:initform</TT> forms), and the <I>initargs</I>. <P>
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Programmers can define <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>methods</I></A> for <A REL=DEFINITION HREF="#initialize-instance"><B>initialize-instance</B></A> to specify actions to be taken when an instance is initialized. If only <A REL=DEFINITION HREF="26_glo_a.htm#after_method"><I>after methods</I></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="#initialize-instance"><B>initialize-instance</B></A>. <P>
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<P><B>Examples:</B> None.
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<P>
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<P><B>Affected By:</B> None.
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<P>
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<P><B>Exceptional Situations:</B> None.
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<P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_shared.htm#shared-initialize"><B>shared-initialize</B></A>, <A REL=DEFINITION HREF="f_mk_ins.htm#make-instance"><B>make-instance</B></A>, <A REL=DEFINITION HREF="f_slt_bo.htm#slot-boundp"><B>slot-boundp</B></A>, <A REL=DEFINITION HREF="f_slt_ma.htm#slot-makunbound"><B>slot-makunbound</B></A>, <A REL=CHILD HREF="07_a.htm">Section 7.1 (Object Creation and Initialization)</A>, <A REL=CHILD HREF="07_ad.htm">Section 7.1.4 (Rules for Initialization Arguments)</A>, <A REL=CHILD HREF="07_ab.htm">Section 7.1.2 (Declaring the Validity of Initialization Arguments)</A> <P>
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<P><B>Notes:</B> None.
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<P>
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<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issue</A>, <I>not part of the specification</I>, applies to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss197.htm">INITIALIZATION-FUNCTION-KEYWORD-CHECKING</A><P></UL><HR>
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