53 lines
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53 lines
4 KiB
HTML
<!-- 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: Function SLOT-EXISTS-P</TITLE>
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<A NAME="slot-exists-p"><I>Function</I> <B>SLOT-EXISTS-P</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>slot-exists-p</B> <I>object slot-name</I> => <I>generalized-boolean</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>object</I>---an <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A>. <P>
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<I>slot-name</I>---a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A>. <P>
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<I>generalized-boolean</I>---a <A REL=DEFINITION HREF="26_glo_g.htm#generalized_boolean"><I>generalized boolean</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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Returns <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A> if the <I>object</I> has a <A REL=DEFINITION HREF="26_glo_s.htm#slot"><I>slot</I></A> named <I>slot-name</I>. <P>
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<P><B>Examples:</B> None.
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<P>
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<P><B>Affected By:</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="m_defstr.htm#defstruct"><B>defstruct</B></A> <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="m_defcla.htm#defclass"><B>defclass</B></A>, <A REL=DEFINITION HREF="f_slt_mi.htm#slot-missing"><B>slot-missing</B></A> <P>
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<P><B>Notes:</B><P>
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<P>
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Although no <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A> is required to do so, implementors are strongly encouraged to implement the <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> <A REL=DEFINITION HREF="#slot-exists-p"><B>slot-exists-p</B></A> using the <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> <TT>slot-exists-p-using-class</TT> described in the <A REL=DEFINITION HREF="26_glo_m.htm#metaobject_protocol"><I>Metaobject Protocol</I></A>. <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/iss320.htm">SLOT-VALUE-METACLASSES:LESS-MINIMAL</A><P></UL><HR>
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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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