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<!DOCTYPE HTML>
<HTML LANG="en-us"
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>bit, sbit | Common Lisp Nova Spec</TITLE
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><TD ALIGN="LEFT" VALIGN="BASELINE" WIDTH="100%" CLASS="name"
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></SPAN
><B
>bit, sbit</B
></TD
><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
><I
>Accessor</I
></TD
></TR
></TABLE
><HR
></DIV
><UL CLASS="subtoc"
></UL
><DL
><DT
><B
>Syntax</B
></DT
><DD
><TABLE CELLSPACING="0" CELLPADDING="0" RULES="GROUPS" STYLE="margin: 1ex 0"
><TBODY
><TR
><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE=";padding-right:3px"
><B
>bit</B
> <SPAN CLASS="cmssi"
>bit-array</SPAN
> <SPAN CLASS="cmtt"
>&amp;rest</SPAN
> <SPAN CLASS="cmssi"
>subscripts</SPAN
></TD
><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE="padding-left:3px;"
> <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> <SPAN CLASS="cmssi"
>bit</SPAN
></TD
></TR
><TR
><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE=";padding-right:3px"
> <B
>sbit</B
> <SPAN CLASS="cmssi"
>bit-array</SPAN
> <SPAN CLASS="cmtt"
>&amp;rest</SPAN
> <SPAN CLASS="cmssi"
>subscripts</SPAN
></TD
><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE="padding-left:3px;"
> <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> <SPAN CLASS="cmssi"
>bit</SPAN
></TD
></TR
></TBODY
></TABLE
><TABLE CELLSPACING="0" CELLPADDING="0" RULES="GROUPS" STYLE="margin: 1ex 0"
><TBODY
><TR
><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE=";"
><B
>(setf (bit</B
> <SPAN CLASS="cmssi"
>bit-array</SPAN
> <SPAN CLASS="cmtt"
>&amp;rest</SPAN
> <SPAN CLASS="cmssi"
>subscripts</SPAN
><B
>)</B
> <SPAN CLASS="cmssi"
>new-bit</SPAN
><B
>)</B
></TD
></TR
><TR
><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE=";"
> <B
>(setf (sbit</B
> <SPAN CLASS="cmssi"
>bit-array</SPAN
> <SPAN CLASS="cmtt"
>&amp;rest</SPAN
> <SPAN CLASS="cmssi"
>subscripts</SPAN
><B
>)</B
> <SPAN CLASS="cmssi"
>new-bit</SPAN
><B
>)</B
></TD
></TR
></TBODY
></TABLE
></DD
><DT
><B
>Arguments and Values</B
></DT
><DD
><P CLASS="j"
><VAR CLASS="param"
>bit-array</VAR
> &#8212; for <A HREF="f_bit.html" CLASS="funref"
><B
>bit</B
></A
>, a <A HREF="26_1_Glossary.html#bit_array"
><EM CLASS="term"
>bit array</EM
></A
>; for <A HREF="f_bit.html" CLASS="funref"
><B
>sbit</B
></A
>, a <A HREF="26_1_Glossary.html#simple_bit_array"
><EM CLASS="term"
>simple bit array</EM
></A
>. </P
><P CLASS="j"
><VAR CLASS="param"
>subscripts</VAR
> &#8212; a <A HREF="26_1_Glossary.html#list"
><EM CLASS="term"
>list</EM
></A
> of <A HREF="26_1_Glossary.html#valid_array_index"
><EM CLASS="term"
>valid array indices</EM
></A
> for the <VAR CLASS="param"
>bit-array</VAR
>. </P
><P CLASS="j"
><VAR CLASS="param"
>bit</VAR
> &#8212; a <A HREF="26_1_Glossary.html#bit"
><EM CLASS="term"
>bit</EM
></A
>.</P
></DD
><DT
><B
>Description</B
></DT
><DD
><P CLASS="j"
><A HREF="f_bit.html" CLASS="funref"
><B
>bit</B
></A
> and <A HREF="f_bit.html" CLASS="funref"
><B
>sbit</B
></A
> <A HREF="26_1_Glossary.html#access"
><EM CLASS="term"
>access</EM
></A
> the <VAR CLASS="param"
>bit-array</VAR
> <A HREF="26_1_Glossary.html#element"
><EM CLASS="term"
>element</EM
></A
> specified by <VAR CLASS="param"
>subscripts</VAR
>. </P
><P CLASS="j"
>These <A HREF="26_1_Glossary.html#function"
><EM CLASS="term"
>functions</EM
></A
> ignore the <A HREF="26_1_Glossary.html#fill_pointer"
><EM CLASS="term"
>fill pointer</EM
></A
> when <A HREF="26_1_Glossary.html#access"
><EM CLASS="term"
>accessing</EM
></A
> <A HREF="26_1_Glossary.html#element"
><EM CLASS="term"
>elements</EM
></A
>.</P
></DD
><DT
><B
>Examples</B
></DT
><DD
><PRE CLASS="screen"
>(bit (setq ba (make-array 8
:element-type 'bit
:initial-element 1))
3) <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 1
(setf (bit ba 3) 0) <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 0
(bit ba 3) <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 0
(sbit ba 5) <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 1
(setf (sbit ba 5) 1) <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 1
(sbit ba 5) <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 1</PRE
></DD
><DT
><B
>See Also</B
></DT
><DD
><P CLASS="j"
><A HREF="f_aref.html" CLASS="funref"
><B
>aref</B
></A
>, <A HREF="3_2_Compilation.html#sec_3_2_1" CLASS="secref"
><SPAN CLASS="cmr"
>Section</SPAN
> <SPAN CLASS="cmr"
>3.2.1</SPAN
> <SPAN CLASS="cmr"
>(Compiler</SPAN
> <SPAN CLASS="cmr"
>Terminology)</SPAN
></A
></P
></DD
><DT
><B
>Notes</B
></DT
><DD
><P CLASS="j"
><A HREF="f_bit.html" CLASS="funref"
><B
>bit</B
></A
> and <A HREF="f_bit.html" CLASS="funref"
><B
>sbit</B
></A
> are like <A HREF="f_aref.html" CLASS="funref"
><B
>aref</B
></A
> except that they require <VAR CLASS="param"
>arrays</VAR
> to be a <A HREF="26_1_Glossary.html#bit_array"
><EM CLASS="term"
>bit array</EM
></A
> and a <A HREF="26_1_Glossary.html#simple_bit_array"
><EM CLASS="term"
>simple bit array</EM
></A
>, respectively. </P
><P CLASS="j"
><A HREF="f_bit.html" CLASS="funref"
><B
>bit</B
></A
> and <A HREF="f_bit.html" CLASS="funref"
><B
>sbit</B
></A
>, unlike <A HREF="f_char.html" CLASS="funref"
><B
>char</B
></A
> and <A HREF="f_char.html" CLASS="funref"
><B
>schar</B
></A
>, allow the first argument to be an <A HREF="26_1_Glossary.html#array"
><EM CLASS="term"
>array</EM
></A
> of any <A HREF="26_1_Glossary.html#rank"
><EM CLASS="term"
>rank</EM
></A
>.</P
></DD
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