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60 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 ALLOCATE-INSTANCE</TITLE>
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<A NAME="allocate-instance"><I>Standard Generic Function</I> <B>ALLOCATE-INSTANCE</B></A> <P>
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<P>
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<P><B>Syntax:</B><P>
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<P>
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<B>allocate-instance</B> <I>class <TT>&rest</TT> initargs <TT>&key</TT> <TT>&allow-other-keys</TT></I> => <I>new-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>allocate-instance</B> <I>(<I>class</I><B> <A REL=DEFINITION HREF="t_std_cl.htm#standard-class">standard-class</A></B>) <TT>&rest</TT> initargs</I><P>
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<P>
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<B>allocate-instance</B> <I>(<I>class</I><B> <A REL=DEFINITION HREF="t_stu_cl.htm#structure-class">structure-class</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>class</I>---a <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A>. <P>
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<I>initargs</I>---a <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A> of <A REL=DEFINITION HREF="26_glo_k.htm#keywordSLvalue_pair"><I>keyword/value pairs</I></A> (initialization argument <A REL=DEFINITION HREF="26_glo_n.htm#name"><I>names</I></A> and <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>values</I></A>). <P>
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<I>new-instance</I>---an <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A> whose <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> is <I>class</I>. <P>
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<P><B>Description:</B><P>
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<P>
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The generic function <A REL=DEFINITION HREF="#allocate-instance"><B>allocate-instance</B></A> creates and returns a new instance of the <I>class</I>, without initializing it. When the <I>class</I> is a <A REL=DEFINITION HREF="26_glo_s.htm#standard_class"><I>standard class</I></A>, this means that the <A REL=DEFINITION HREF="26_glo_s.htm#slot"><I>slots</I></A> are <A REL=DEFINITION HREF="26_glo_u.htm#unbound"><I>unbound</I></A>; when the <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> is a <A REL=DEFINITION HREF="26_glo_s.htm#structure_class"><I>structure class</I></A>, this means the <A REL=DEFINITION HREF="26_glo_s.htm#slot"><I>slots</I></A>' <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>values</I></A> are unspecified. <P>
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The caller of <A REL=DEFINITION HREF="#allocate-instance"><B>allocate-instance</B></A> is expected to have already checked the initialization arguments. <P>
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The <A REL=DEFINITION HREF="26_glo_g.htm#generic_function"><I>generic function</I></A> <A REL=DEFINITION HREF="#allocate-instance"><B>allocate-instance</B></A> is called by <A REL=DEFINITION HREF="f_mk_ins.htm#make-instance"><B>make-instance</B></A>, as described in <A REL=CHILD HREF="07_a.htm">Section 7.1 (Object Creation and Initialization)</A>. <P>
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<P><B>Affected By:</B> None.
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<P><B>Exceptional Situations:</B> None.
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="m_defcla.htm#defclass"><B>defclass</B></A>, <A REL=DEFINITION HREF="f_mk_ins.htm#make-instance"><B>make-instance</B></A>, <A REL=DEFINITION HREF="f_clas_1.htm#class-of"><B>class-of</B></A>, <A REL=CHILD HREF="07_a.htm">Section 7.1 (Object Creation and Initialization)</A> <P>
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<P><B>Notes:</B><P>
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<P>
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The consequences of adding <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>methods</I></A> to <A REL=DEFINITION HREF="#allocate-instance"><B>allocate-instance</B></A> is unspecified. This capability might be added by the <A REL=DEFINITION HREF="26_glo_m.htm#metaobject_protocol"><I>Metaobject Protocol</I></A>. <P>
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<P>
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<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issues</A>, <I>not part of the specification</I>, apply to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss197.htm">INITIALIZATION-FUNCTION-KEYWORD-CHECKING</A><LI> <A REL=CHILD HREF="../Issues/iss006.htm">ALLOCATE-INSTANCE:ADD</A><P></UL><HR>
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