64 lines
3.9 KiB
HTML
64 lines
3.9 KiB
HTML
<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
|
|
<HTML>
|
|
<HEAD>
|
|
<TITLE>CLHS: Function LISTP</TITLE>
|
|
<LINK HREF="../Data/clhs.css" REL="stylesheet" TYPE="text/css" />
|
|
<META HTTP-EQUIV="Author" CONTENT="Kent M. Pitman">
|
|
<META HTTP-EQUIV="Organization" CONTENT="LispWorks Ltd.">
|
|
<LINK REL=TOP HREF="../Front/index.htm">
|
|
<LINK REL=COPYRIGHT HREF="../Front/Help.htm#Legal">
|
|
<LINK REL=DISCLAIMER HREF="../Front/Help.htm#Disclaimer">
|
|
<LINK REL=PREV HREF="f_list_l.htm">
|
|
<LINK REL=UP HREF="c_conses.htm">
|
|
<LINK REL=NEXT HREF="f_mk_lis.htm">
|
|
</HEAD>
|
|
<BODY>
|
|
<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_list_l.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_mk_lis.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
|
|
|
|
<HR>
|
|
|
|
<A NAME="listp"><I>Function</I> <B>LISTP</B></A> <P>
|
|
<P><B>Syntax:</B><P>
|
|
<P>
|
|
|
|
<B>listp</B> <I>object</I> => <I>generalized-boolean</I><P>
|
|
<P>
|
|
<P><B>Arguments and Values:</B><P>
|
|
<P>
|
|
<I>object</I>---an <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A>. <P>
|
|
<I>generalized-boolean</I>---a <A REL=DEFINITION HREF="26_glo_g.htm#generalized_boolean"><I>generalized boolean</I></A>. <P>
|
|
<P><B>Description:</B><P>
|
|
<P>
|
|
Returns <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A> if <I>object</I> is of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="t_list.htm#list"><B>list</B></A>; otherwise, returns <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A>. <P>
|
|
<P><B>Examples:</B><P>
|
|
|
|
<PRE>
|
|
(listp nil) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
|
|
(listp (cons 1 2)) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
|
|
(listp (make-array 6)) => <A REL=DEFINITION HREF="26_glo_f.htm#false">false</A>
|
|
(listp t) => <A REL=DEFINITION HREF="26_glo_f.htm#false">false</A>
|
|
</PRE>
|
|
</TT> <P>
|
|
<P><B>Side Effects:</B> None.
|
|
<P>
|
|
<P><B>Affected By:</B> None.
|
|
<P>
|
|
<P><B>Exceptional Situations:</B> None.
|
|
<P>
|
|
<P><B>See Also:</B><P>
|
|
<P>
|
|
<A REL=DEFINITION HREF="f_consp.htm#consp"><B>consp</B></A> <P>
|
|
<P><B>Notes:</B><P>
|
|
<P>
|
|
If <I>object</I> is a <A REL=DEFINITION HREF="26_glo_c.htm#cons"><I>cons</I></A>, <A REL=DEFINITION HREF="#listp"><B>listp</B></A> does not check whether <I>object</I> is a <A REL=DEFINITION HREF="26_glo_p.htm#proper_list"><I>proper list</I></A>; it returns <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A> for any kind of <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A>. <P>
|
|
<PRE>
|
|
(listp object) == (typep object 'list) == (typep object '(or cons null))
|
|
</PRE>
|
|
</TT> <P>
|
|
<HR>
|
|
|
|
<A REL=NAVIGATOR HREF="../Front/StartPts.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Starting Points]" SRC="../Graphics/StartPts.gif" ALIGN=Bottom></A><A REL=TOC HREF="../Front/Contents.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Contents]" SRC="../Graphics/Contents.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Master.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Index]" SRC="../Graphics/Index.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Symbol.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Symbols]" SRC="../Graphics/Symbols.gif" ALIGN=Bottom></A><A REL=GLOSSARY HREF="../Body/26_a.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Glossary]" SRC="../Graphics/Glossary.gif" ALIGN=Bottom></A><A HREF="../Front/X3J13Iss.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Issues]" SRC="../Graphics/Issues.gif" ALIGN=Bottom></A><BR>
|
|
|
|
<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
|
|
</BODY>
|
|
</HTML>
|