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41 lines
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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: Section 2.4.8.13</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="02_dhl.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="02_dh.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="02_dhn.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>
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2.4.8.13 Sharpsign S</H2> <P>
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<TT>#s(name slot1 value1 slot2 value2 ...)</TT> denotes a <A REL=DEFINITION HREF="26_glo_s.htm#structure"><I>structure</I></A>. This is valid only if <I>name</I> is the name of a <A REL=DEFINITION HREF="26_glo_s.htm#structure"><I>structure</I></A> <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> already defined by <A REL=DEFINITION HREF="m_defstr.htm#defstruct"><B>defstruct</B></A> and if the <A REL=DEFINITION HREF="26_glo_s.htm#structure"><I>structure</I></A> <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> has a standard constructor function. Let <I>cm</I> stand for the name of this constructor function; then this syntax is equivalent to <P>
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<PRE>
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#.(cm keyword1 'value1 keyword2 'value2 ...)
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</PRE>
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</TT> <P>
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where each <I>keywordj</I> is the result of computing <P>
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<PRE>
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(intern (string slotj) (find-package 'keyword))
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</PRE>
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</TT> <P>
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The net effect is that the constructor function is called with the specified slots having the specified values. (This coercion feature is deprecated; in the future, keyword names will be taken in the package they are read in, so <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A> that are actually in the <TT>KEYWORD</TT> package should be used if that is what is desired.) <P>
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Whatever <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A> the constructor function returns is returned by the <TT>#S</TT> syntax. <P>
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For information on how the <A REL=DEFINITION HREF="26_glo_l.htm#lisp_printer"><I>Lisp printer</I></A> prints <A REL=DEFINITION HREF="26_glo_s.htm#structure"><I>structures</I></A>, see <A REL=CHILD HREF="22_acl.htm">Section 22.1.3.12 (Printing Structures)</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/iss331.htm">STRUCTURE-READ-PRINT-SYNTAX:KEYWORDS</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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