68 lines
4.3 KiB
HTML
68 lines
4.3 KiB
HTML
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<TITLE>CLHS: Function COPY-ALIST</TITLE>
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<A NAME="copy-alist"><I>Function</I> <B>COPY-ALIST</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>copy-alist</B> <I>alist</I> => <I>new-alist</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>alist</I>---an <A REL=DEFINITION HREF="26_glo_a.htm#association_list"><I>association list</I></A>. <P>
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<I>new-alist</I>---an <A REL=DEFINITION HREF="26_glo_a.htm#association_list"><I>association list</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="#copy-alist"><B>copy-alist</B></A> returns a <A REL=DEFINITION HREF="26_glo_c.htm#copy"><I>copy</I></A> of <I>alist</I>. <P>
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The <A REL=DEFINITION HREF="26_glo_l.htm#list_structure"><I>list structure</I></A> of <I>alist</I> is copied, and the <A REL=DEFINITION HREF="26_glo_e.htm#element"><I>elements</I></A> of <I>alist</I> which are <A REL=DEFINITION HREF="26_glo_c.htm#cons"><I>conses</I></A> are also copied (as <A REL=DEFINITION HREF="26_glo_c.htm#cons"><I>conses</I></A> only). Any other <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> which are referred to, whether directly or indirectly, by the <I>alist</I> continue to be shared. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(defparameter *alist* (acons 1 "one" (acons 2 "two" '())))
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*alist* => ((1 . "one") (2 . "two"))
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(defparameter *list-copy* (copy-list *alist*))
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*list-copy* => ((1 . "one") (2 . "two"))
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(defparameter *alist-copy* (copy-alist *alist*))
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*alist-copy* => ((1 . "one") (2 . "two"))
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(setf (cdr (assoc 2 *alist-copy*)) "deux") => "deux"
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*alist-copy* => ((1 . "one") (2 . "deux"))
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*alist* => ((1 . "one") (2 . "two"))
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(setf (cdr (assoc 1 *list-copy*)) "uno") => "uno"
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*list-copy* => ((1 . "uno") (2 . "two"))
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*alist* => ((1 . "uno") (2 . "two"))
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</PRE>
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</TT> <P>
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<P><B>Side Effects:</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_cp_lis.htm#copy-list"><B>copy-list</B></A> <P>
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<P><B>Notes:</B> None.
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