69 lines
3.9 KiB
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69 lines
3.9 KiB
HTML
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<TITLE>CLHS: Function RPLACA, RPLACD</TITLE>
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<A NAME="rplaca"><A NAME="rplacd"><I>Function</I> <B>RPLACA, RPLACD</B></A></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>rplaca</B> <I>cons object</I> => <I>cons</I><P>
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<B>rplacd</B> <I>cons object</I> => <I>cons</I><P>
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<P>
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<P><B>Pronunciation:</B><P>
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<P>
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<A REL=DEFINITION HREF="#rplaca"><B>rplaca</B></A>: [,ree'plakuh] or [,ruh'plakuh] <P>
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<A REL=DEFINITION HREF="#rplacd"><B>rplacd</B></A>: [,ree'plakduh] or [,ruh'plakduh] or [,ree'plakdee] or [,ruh'plakdee] <P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>cons</I>---a <A REL=DEFINITION HREF="26_glo_c.htm#cons"><I>cons</I></A>. <P>
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<I>object</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="#rplaca"><B>rplaca</B></A> replaces the <A REL=DEFINITION HREF="26_glo_c.htm#car"><I>car</I></A> of the <I>cons</I> with <I>object</I>. <P>
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<A REL=DEFINITION HREF="#rplacd"><B>rplacd</B></A> replaces the <A REL=DEFINITION HREF="26_glo_c.htm#cdr"><I>cdr</I></A> of the <I>cons</I> with <I>object</I>. <P>
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<P><B>Examples:</B><P>
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<PRE>
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(defparameter *some-list* (list* 'one 'two 'three 'four)) => *some-list*
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*some-list* => (ONE TWO THREE . FOUR)
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(rplaca *some-list* 'uno) => (UNO TWO THREE . FOUR)
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*some-list* => (UNO TWO THREE . FOUR)
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(rplacd (last *some-list*) (list 'IV)) => (THREE IV)
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*some-list* => (UNO TWO THREE IV)
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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 <I>cons</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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Should signal an error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_tp_err.htm#type-error"><B>type-error</B></A> if <I>cons</I> is not a <A REL=DEFINITION HREF="26_glo_c.htm#cons"><I>cons</I></A>. <P>
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<P><B>See Also:</B> None.
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<P>
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<P><B>Notes:</B> None.
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