69 lines
4.2 KiB
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69 lines
4.2 KiB
HTML
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<TITLE>CLHS: Accessor REST</TITLE>
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<A NAME="rest"><I>Accessor</I> <B>REST</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>rest</B> <I>list</I> => <I>tail</I><P>
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<TT>(setf (</TT><B>rest</B> <I>list</I><TT>) </TT><I>new-tail</I><TT>)</TT><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_l.htm#list"><I>list</I></A>, which might be a <A REL=DEFINITION HREF="26_glo_d.htm#dotted_list"><I>dotted list</I></A> or a <A REL=DEFINITION HREF="26_glo_c.htm#circular_list"><I>circular list</I></A>. <P>
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<I>tail</I>---an <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</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="#rest"><B>rest</B></A> performs the same operation as <A REL=DEFINITION HREF="f_car_c.htm#cdr"><B>cdr</B></A>, but mnemonically complements <A REL=DEFINITION HREF="f_firstc.htm#first"><B>first</B></A>. Specifically, <P>
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<PRE>
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(rest list) == (cdr list)
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(setf (rest list) new-tail) == (setf (cdr list) new-tail)
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</PRE>
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</TT> <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(rest '(1 2)) => (2)
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(rest '(1 . 2)) => 2
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(rest '(1)) => NIL
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(setq *cons* '(1 . 2)) => (1 . 2)
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(setf (rest *cons*) "two") => "two"
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*cons* => (1 . "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_car_c.htm#cdr"><B>cdr</B></A>, <A REL=DEFINITION HREF="f_nthcdr.htm#nthcdr"><B>nthcdr</B></A> <P>
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<P><B>Notes:</B><P>
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<P>
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<A REL=DEFINITION HREF="#rest"><B>rest</B></A> is often preferred stylistically over <A REL=DEFINITION HREF="f_car_c.htm#cdr"><B>cdr</B></A> when the argument is to being subjectively viewed as a <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A> rather than as a <A REL=DEFINITION HREF="26_glo_c.htm#cons"><I>cons</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/iss138.htm">DOTTED-LIST-ARGUMENTS:CLARIFY</A><P></UL><HR>
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