81 lines
4.9 KiB
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81 lines
4.9 KiB
HTML
<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
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<TITLE>CLHS: Accessor CHAR, SCHAR</TITLE>
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<HR>
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<A NAME="char"><A NAME="schar"><I>Accessor</I> <B>CHAR, SCHAR</B></A></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>char</B> <I>string index</I> => <I>character</I><P>
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<B>schar</B> <I>string index</I> => <I>character</I><P>
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<P>
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<TT>(setf (</TT><B>char</B> <I>string index</I><TT>) </TT><I>new-character</I><TT>)</TT><P>
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<TT>(setf (</TT><B>schar</B> <I>string index</I><TT>) </TT><I>new-character</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>string</I>---for <A REL=DEFINITION HREF="#char"><B>char</B></A>, a <A REL=DEFINITION HREF="26_glo_s.htm#string"><I>string</I></A>; for <A REL=DEFINITION HREF="#schar"><B>schar</B></A>, a <A REL=DEFINITION HREF="26_glo_s.htm#simple_string"><I>simple string</I></A>. <P>
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<I>index</I>---a <A REL=DEFINITION HREF="26_glo_v.htm#valid_array_index"><I>valid array index</I></A> for the <I>string</I>. <P>
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<I>character</I>, <I>new-character</I>---a <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</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="#char"><B>char</B></A> and <A REL=DEFINITION HREF="#schar"><B>schar</B></A> <A REL=DEFINITION HREF="26_glo_a.htm#access"><I>access</I></A> the <A REL=DEFINITION HREF="26_glo_e.htm#element"><I>element</I></A> of <I>string</I> specified by <I>index</I>. <P>
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<A REL=DEFINITION HREF="#char"><B>char</B></A> ignores <A REL=DEFINITION HREF="26_glo_f.htm#fill_pointer"><I>fill pointers</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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(setq my-simple-string (make-string 6 :initial-element #\A)) => "AAAAAA"
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(schar my-simple-string 4) => #\A
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(setf (schar my-simple-string 4) #\B) => #\B
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my-simple-string => "AAAABA"
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(setq my-filled-string
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(make-array 6 :element-type 'character
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:fill-pointer 5
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:initial-contents my-simple-string))
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=> "AAAAB"
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(char my-filled-string 4) => #\B
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(char my-filled-string 5) => #\A
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(setf (char my-filled-string 3) #\C) => #\C
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(setf (char my-filled-string 5) #\D) => #\D
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(setf (fill-pointer my-filled-string) 6) => 6
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my-filled-string => "AAACBD"
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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=DEFINITION HREF="f_elt.htm#elt"><B>elt</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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<PRE>
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(char s j) == (aref (the string s) j)
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</PRE>
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</TT> <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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