68 lines
4.5 KiB
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68 lines
4.5 KiB
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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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<TITLE>CLHS: Accessor SVREF</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_smp_ve.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_vector.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="svref"><I>Accessor</I> <B>SVREF</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>svref</B> <I>simple-vector index</I> => <I>element</I><P>
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<TT>(setf (</TT><B>svref</B> <I>simple-vector index</I><TT>) </TT><I>new-element</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>simple-vector</I>---a <A REL=DEFINITION HREF="26_glo_s.htm#simple_vector"><I>simple vector</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>simple-vector</I>. <P>
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<I>element</I>, <I>new-element</I>---an <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A> (whose <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> is a <A REL=DEFINITION HREF="26_glo_s.htm#subtype"><I>subtype</I></A> of the <A REL=DEFINITION HREF="26_glo_a.htm#array_element_type"><I>array element type</I></A> of the <I>simple-vector</I>). <P>
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<P><B>Description:</B><P>
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<P>
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<A REL=DEFINITION HREF="26_glo_a.htm#access"><I>Accesses</I></A> the <A REL=DEFINITION HREF="26_glo_e.htm#element"><I>element</I></A> of <I>simple-vector</I> specified by <I>index</I>. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(simple-vector-p (setq v (vector 1 2 'sirens))) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
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(svref v 0) => 1
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(svref v 2) => SIRENS
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(setf (svref v 1) 'newcomer) => NEWCOMER
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v => #(1 NEWCOMER SIRENS)
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</PRE>
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</TT> <P>
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<P><B>Side Effects:</B> None.
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<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_bt_sb.htm#sbit"><B>sbit</B></A>, <A REL=DEFINITION HREF="f_char_.htm#schar"><B>schar</B></A>, <A REL=DEFINITION HREF="f_vector.htm#vector"><B>vector</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="#svref"><B>svref</B></A> is identical to <A REL=DEFINITION HREF="f_aref.htm#aref"><B>aref</B></A> except that it requires its first argument to be a <A REL=DEFINITION HREF="26_glo_s.htm#simple_vector"><I>simple vector</I></A>. <P>
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<PRE>
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(svref v i) == (aref (the simple-vector v) i)
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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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