71 lines
4.6 KiB
HTML
71 lines
4.6 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: Function COPY-LIST</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="f_tree_e.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="c_conses.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="f_list_.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<HR>
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<A NAME="copy-list"><I>Function</I> <B>COPY-LIST</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>copy-list</B> <I>list</I> => <I>copy</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>list</I>---a <A REL=DEFINITION HREF="26_glo_p.htm#proper_list"><I>proper list</I></A> or a <A REL=DEFINITION HREF="26_glo_d.htm#dotted_list"><I>dotted list</I></A>. <P>
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<I>copy</I>---a <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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Returns a <A REL=DEFINITION HREF="26_glo_c.htm#copy"><I>copy</I></A> of <I>list</I>. If <I>list</I> is a <A REL=DEFINITION HREF="26_glo_d.htm#dotted_list"><I>dotted list</I></A>, the resulting <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A> will also be a <A REL=DEFINITION HREF="26_glo_d.htm#dotted_list"><I>dotted list</I></A>. <P>
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Only the <A REL=DEFINITION HREF="26_glo_l.htm#list_structure"><I>list structure</I></A> of <I>list</I> is copied; the <A REL=DEFINITION HREF="26_glo_e.htm#element"><I>elements</I></A> of the resulting list are the <A REL=DEFINITION HREF="26_glo_s.htm#same"><I>same</I></A> as the corresponding <A REL=DEFINITION HREF="26_glo_e.htm#element"><I>elements</I></A> of the given <I>list</I>. <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 lst (list 1 (list 2 3))) => (1 (2 3))
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(setq slst lst) => (1 (2 3))
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(setq clst (copy-list lst)) => (1 (2 3))
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(eq slst lst) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
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(eq clst lst) => <A REL=DEFINITION HREF="26_glo_f.htm#false">false</A>
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(equal clst lst) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
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(rplaca lst "one") => ("one" (2 3))
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slst => ("one" (2 3))
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clst => (1 (2 3))
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(setf (caadr lst) "two") => "two"
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lst => ("one" ("two" 3))
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slst => ("one" ("two" 3))
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clst => (1 ("two" 3))
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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><P>
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<P>
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The consequences are undefined if <I>list</I> is a <A REL=DEFINITION HREF="26_glo_c.htm#circular_list"><I>circular list</I></A>. <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_ali.htm#copy-alist"><B>copy-alist</B></A>, <A REL=DEFINITION HREF="f_cp_seq.htm#copy-seq"><B>copy-seq</B></A>, <A REL=DEFINITION HREF="f_cp_tre.htm#copy-tree"><B>copy-tree</B></A> <P>
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<P><B>Notes:</B><P>
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<P>
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The copy created is <A REL=DEFINITION HREF="f_equal.htm#equal"><B>equal</B></A> to <I>list</I>, but not <A REL=DEFINITION HREF="f_eq.htm#eq"><B>eq</B></A>. <P>
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