63 lines
5.6 KiB
HTML
63 lines
5.6 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: Macro REMF</TITLE>
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<A NAME="remf"><I>Macro</I> <B>REMF</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>remf</B> <I>place indicator</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>place</I>---a <A REL=DEFINITION HREF="26_glo_p.htm#place"><I>place</I></A>. <P>
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<I>indicator</I>---an <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</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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<A REL=DEFINITION HREF="#remf"><B>remf</B></A> removes from the <A REL=DEFINITION HREF="26_glo_p.htm#property_list"><I>property list</I></A> stored in <I>place</I> a <A REL=DEFINITION HREF="26_glo_p.htm#property"><I>property</I></A>[1] with a <A REL=DEFINITION HREF="26_glo_p.htm#property_indicator"><I>property indicator</I></A> <A REL=DEFINITION HREF="26_glo_i.htm#identical"><I>identical</I></A> to <I>indicator</I>. If there are multiple <A REL=DEFINITION HREF="26_glo_p.htm#property"><I>properties</I></A>[1] with the <A REL=DEFINITION HREF="26_glo_i.htm#identical"><I>identical</I></A> key, <A REL=DEFINITION HREF="#remf"><B>remf</B></A> only removes the first such <A REL=DEFINITION HREF="26_glo_p.htm#property"><I>property</I></A>. <A REL=DEFINITION HREF="#remf"><B>remf</B></A> returns <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A> if no such <A REL=DEFINITION HREF="26_glo_p.htm#property"><I>property</I></A> was found, or <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A> if a property was found. <P>
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The <A REL=DEFINITION HREF="26_glo_p.htm#property_indicator"><I>property indicator</I></A> and the corresponding <A REL=DEFINITION HREF="26_glo_p.htm#property_value"><I>property value</I></A> are removed in an undefined order by destructively splicing the property list. <A REL=DEFINITION HREF="#remf"><B>remf</B></A> is permitted to either <A REL=DEFINITION HREF="m_setf_.htm#setf"><B>setf</B></A> <I>place</I> or to <A REL=DEFINITION HREF="m_setf_.htm#setf"><B>setf</B></A> any part, <A REL=DEFINITION HREF="f_car_c.htm#car"><B>car</B></A> or <A REL=DEFINITION HREF="f_car_c.htm#cdr"><B>cdr</B></A>, of the <A REL=DEFINITION HREF="26_glo_l.htm#list_structure"><I>list structure</I></A> held by that <I>place</I>. <P>
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For information about the <A REL=DEFINITION HREF="26_glo_e.htm#evaluation"><I>evaluation</I></A> of <A REL=DEFINITION HREF="26_glo_s.htm#subform"><I>subforms</I></A> of <I>place</I>, see <A REL=CHILD HREF="05_aaa.htm">Section 5.1.1.1 (Evaluation of Subforms to Places)</A>. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(setq x (cons () ())) => (NIL)
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(setf (getf (car x) 'prop1) 'val1) => VAL1
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(remf (car x) 'prop1) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
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(remf (car x) 'prop1) => <A REL=DEFINITION HREF="26_glo_f.htm#false">false</A>
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</PRE>
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</TT> <P>
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<P><B>Side Effects:</B><P>
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<P>
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The property list stored in <I>place</I> is modified. <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_rempro.htm#remprop"><B>remprop</B></A>, <A REL=DEFINITION HREF="f_getf.htm#getf"><B>getf</B></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 issues</A>, <I>not part of the specification</I>, apply to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss279.htm">PUSH-EVALUATION-ORDER:FIRST-ITEM</A><LI> <A REL=CHILD HREF="../Issues/iss293.htm">REMF-DESTRUCTION-UNSPECIFIED:X3J13-MAR-89</A><LI> <A REL=CHILD HREF="../Issues/iss269.htm">PLIST-DUPLICATES:ALLOW</A><P></UL><HR>
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