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73 lines
5.3 KiB
HTML
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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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<HTML>
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<HEAD>
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<TITLE>CLHS: Accessor BIT, SBIT</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_vecp.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="c_arrays.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="f_bt_and.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="bit"><A NAME="sbit"><I>Accessor</I> <B>BIT, SBIT</B></A></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>bit</B> <I>bit-array </I><TT>&rest</TT><I> subscripts</I> => <I>bit</I><P>
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<B>sbit</B> <I>bit-array </I><TT>&rest</TT><I> subscripts</I> => <I>bit</I><P>
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<TT>(setf (</TT><B>bit</B> <I>bit-array </I><TT>&rest</TT><I> subscripts</I><TT>) </TT><I>new-bit</I><TT>)</TT><P>
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<TT>(setf (</TT><B>sbit</B> <I>bit-array </I><TT>&rest</TT><I> subscripts</I><TT>) </TT><I>new-bit</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>bit-array</I>---for <A REL=DEFINITION HREF="#bit"><B>bit</B></A>, a <A REL=DEFINITION HREF="26_glo_b.htm#bit_array"><I>bit array</I></A>; for <A REL=DEFINITION HREF="#sbit"><B>sbit</B></A>, a <A REL=DEFINITION HREF="26_glo_s.htm#simple_bit_array"><I>simple bit array</I></A>. <P>
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<I>subscripts</I>---a <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A> of <I>valid array indices</I> for the <I>bit-array</I>. <P>
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<I>bit</I>---a <A REL=DEFINITION HREF="26_glo_b.htm#bit"><I>bit</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="#bit"><B>bit</B></A> and <A REL=DEFINITION HREF="#sbit"><B>sbit</B></A> <A REL=DEFINITION HREF="26_glo_a.htm#access"><I>access</I></A> the <I>bit-array</I> <A REL=DEFINITION HREF="26_glo_e.htm#element"><I>element</I></A> specified by <I>subscripts</I>. <P>
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These <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>functions</I></A> ignore the <A REL=DEFINITION HREF="26_glo_f.htm#fill_pointer"><I>fill pointer</I></A> when <I>accessing</I> <A REL=DEFINITION HREF="26_glo_e.htm#element"><I>elements</I></A>. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(bit (setq ba (make-array 8
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:element-type 'bit
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:initial-element 1))
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3) => 1
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(setf (bit ba 3) 0) => 0
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(bit ba 3) => 0
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(sbit ba 5) => 1
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(setf (sbit ba 5) 1) => 1
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(sbit ba 5) => 1
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</PRE>
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</TT> <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_aref.htm#aref"><B>aref</B></A>, <A REL=CHILD HREF="03_ba.htm">Section 3.2.1 (Compiler Terminology)</A> <P>
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<P><B>Notes:</B><P>
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<P>
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<A REL=DEFINITION HREF="#bit"><B>bit</B></A> and <A REL=DEFINITION HREF="#sbit"><B>sbit</B></A> are like <A REL=DEFINITION HREF="f_aref.htm#aref"><B>aref</B></A> except that they require <I>arrays</I> to be a <A REL=DEFINITION HREF="26_glo_b.htm#bit_array"><I>bit array</I></A> and a <A REL=DEFINITION HREF="26_glo_s.htm#simple_bit_array"><I>simple bit array</I></A>, respectively. <P>
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<A REL=DEFINITION HREF="#bit"><B>bit</B></A> and <A REL=DEFINITION HREF="#sbit"><B>sbit</B></A>, unlike <A REL=DEFINITION HREF="f_char_.htm#char"><B>char</B></A> and <A REL=DEFINITION HREF="f_char_.htm#schar"><B>schar</B></A>, allow the first argument to be an <A REL=DEFINITION HREF="26_glo_a.htm#array"><I>array</I></A> of any <A REL=DEFINITION HREF="26_glo_r.htm#rank"><I>rank</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/iss083.htm">CONSTANT-MODIFICATION:DISALLOW</A><P></UL><HR>
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<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>
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<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
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