64 lines
5.8 KiB
HTML
64 lines
5.8 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 UPGRADED-ARRAY-ELEMENT-TYPE</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_row_ma.htm">
|
|
<LINK REL=UP HREF="c_arrays.htm">
|
|
<LINK REL=NEXT HREF="v_ar_dim.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_row_ma.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="v_ar_dim.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
|
|
|
|
<HR>
|
|
|
|
<A NAME="upgraded-array-element-type"><I>Function</I> <B>UPGRADED-ARRAY-ELEMENT-TYPE</B></A> <P>
|
|
<P><B>Syntax:</B><P>
|
|
<P>
|
|
|
|
<B>upgraded-array-element-type</B> <I>typespec <TT>&optional</TT> environment</I> => <I>upgraded-typespec</I><P>
|
|
<P>
|
|
<P><B>Arguments and Values:</B><P>
|
|
<P>
|
|
<I>typespec</I>---a <A REL=DEFINITION HREF="26_glo_t.htm#type_specifier"><I>type specifier</I></A>. <P>
|
|
<I>environment</I>---an <A REL=DEFINITION HREF="26_glo_e.htm#environment"><I>environment</I></A> <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A>. The default is <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>, denoting the <A REL=DEFINITION HREF="26_glo_n.htm#null_lexical_environment"><I>null lexical environment</I></A> and the current <A REL=DEFINITION HREF="26_glo_g.htm#global_environment"><I>global environment</I></A>. <P>
|
|
<I>upgraded-typespec</I>---a <A REL=DEFINITION HREF="26_glo_t.htm#type_specifier"><I>type specifier</I></A>. <P>
|
|
<P><B>Description:</B><P>
|
|
<P>
|
|
Returns the <A REL=DEFINITION HREF="26_glo_e.htm#element_type"><I>element type</I></A> of the most <A REL=DEFINITION HREF="26_glo_s.htm#specialized"><I>specialized</I></A> <A REL=DEFINITION HREF="26_glo_a.htm#array"><I>array</I></A> representation capable of holding items of the <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> denoted by <I>typespec</I>. <P>
|
|
The <I>typespec</I> is a <A REL=DEFINITION HREF="26_glo_s.htm#subtype"><I>subtype</I></A> of (and possibly <A REL=DEFINITION HREF="26_glo_t.htm#type_equivalent"><I>type equivalent</I></A> to) the <I>upgraded-typespec</I>. <P>
|
|
If <I>typespec</I> is <A REL=DEFINITION HREF="t_bit.htm#bit"><B>bit</B></A>, the result is <A REL=DEFINITION HREF="26_glo_t.htm#type_equivalent"><I>type equivalent</I></A> to <TT>bit</TT>. If <I>typespec</I> is <A REL=DEFINITION HREF="t_base_c.htm#base-char"><B>base-char</B></A>, the result is <A REL=DEFINITION HREF="26_glo_t.htm#type_equivalent"><I>type equivalent</I></A> to <TT>base-char</TT>. If <I>typespec</I> is <A REL=DEFINITION HREF="t_ch.htm#character"><B>character</B></A>, the result is <A REL=DEFINITION HREF="26_glo_t.htm#type_equivalent"><I>type equivalent</I></A> to <TT>character</TT>. <P>
|
|
The purpose of <A REL=DEFINITION HREF="#upgraded-array-element-type"><B>upgraded-array-element-type</B></A> is to reveal how an implementation does its <I>upgrading</I>. <P>
|
|
The <I>environment</I> is used to expand any <A REL=DEFINITION HREF="26_glo_d.htm#derived_type_specifier"><I>derived type specifiers</I></A> that are mentioned in the <I>typespec</I>. <P>
|
|
<P><B>Examples:</B> None.
|
|
<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_ar_ele.htm#array-element-type"><B>array-element-type</B></A>, <A REL=DEFINITION HREF="f_mk_ar.htm#make-array"><B>make-array</B></A> <P>
|
|
<P><B>Notes:</B><P>
|
|
<P>
|
|
Except for storage allocation consequences and dealing correctly with the optional <I>environment</I> <A REL=DEFINITION HREF="26_glo_a.htm#argument"><I>argument</I></A>, <A REL=DEFINITION HREF="#upgraded-array-element-type"><B>upgraded-array-element-type</B></A> could be defined as: <P>
|
|
<PRE>
|
|
(defun upgraded-array-element-type (type &optional environment)
|
|
(array-element-type (make-array 0 :element-type type)))
|
|
</PRE>
|
|
</TT> <P>
|
|
<P>
|
|
<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issues</A>, <I>not part of the specification</I>, apply to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss046.htm">CHARACTER-VS-CHAR:LESS-INCONSISTENT-SHORT</A><LI> <A REL=CHILD HREF="../Issues/iss015.htm">ARRAY-TYPE-ELEMENT-TYPE-SEMANTICS:UNIFY-UPGRADING</A><LI> <A REL=CHILD HREF="../Issues/iss334.htm">SUBTYPEP-ENVIRONMENT:ADD-ARG</A><P></UL><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>
|