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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: Function COPY-LIST</TITLE>
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<A NAME="copy-list"><I>Function</I> <B>COPY-LIST</B></A> <P>
<P><B>Syntax:</B><P>
<P>
<B>copy-list</B> <I>list</I> =&gt; <I>copy</I><P>
<P>
<P><B>Arguments and Values:</B><P>
<P>
<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>
<I>copy</I>---a <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A>. <P>
<P><B>Description:</B><P>
<P>
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>
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>
<P><B>Examples:</B><P>
<P>
<PRE>
(setq lst (list 1 (list 2 3))) =&gt; (1 (2 3))
(setq slst lst) =&gt; (1 (2 3))
(setq clst (copy-list lst)) =&gt; (1 (2 3))
(eq slst lst) =&gt; <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
(eq clst lst) =&gt; <A REL=DEFINITION HREF="26_glo_f.htm#false">false</A>
(equal clst lst) =&gt; <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
(rplaca lst &quot;one&quot;) =&gt; (&quot;one&quot; (2 3))
slst =&gt; (&quot;one&quot; (2 3))
clst =&gt; (1 (2 3))
(setf (caadr lst) &quot;two&quot;) =&gt; &quot;two&quot;
lst =&gt; (&quot;one&quot; (&quot;two&quot; 3))
slst =&gt; (&quot;one&quot; (&quot;two&quot; 3))
clst =&gt; (1 (&quot;two&quot; 3))
</PRE>
</TT> <P>
<P><B>Side Effects:</B> None.
<P>
<P><B>Affected By:</B> None.
<P>
<P><B>Exceptional Situations:</B><P>
<P>
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>
<P><B>See Also:</B><P>
<P>
<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>
<P><B>Notes:</B><P>
<P>
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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