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2.5 KiB
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49 lines
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Converted with LaTeX2HTML 0.6.5 (Tue Nov 15 1994) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE>9. Declarations</TITLE>
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<BODY>
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<meta name="description" value=" Declarations">
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<meta name="keywords" value="clm">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<b>Common Lisp the Language, 2nd Edition</b>
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<BR> <HR><A NAME=tex2html2804 HREF="node104.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html2802 HREF="clm.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html2796 HREF="node102.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html2806 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html2807 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html2805 HREF="node104.html"> Declaration Syntax</A>
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<B>Up:</B> <A NAME=tex2html2803 HREF="clm.html">Common Lisp the Language</A>
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<B> Previous:</B> <A NAME=tex2html2797 HREF="node102.html"> Environments</A>
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<HR> <P>
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<H1><A NAME=SECTION001300000000000000000>9. Declarations</A></H1>
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<P>
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<A NAME=DECLAR>
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Declarations</A> allow you to specify extra information about your program
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to the Lisp system. With one exception,
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declarations are completely optional
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and correct declarations do not affect the meaning
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of a correct program. The exception is that
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<tt>special</tt> declarations <i>do</i> affect the interpretation of variable
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bindings and references and so <i>must</i> be specified where appropriate.
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All other declarations are of an advisory nature, and may be used
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by the Lisp system to aid the programmer by performing extra error checking
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or producing more efficient compiled code. Declarations are also
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a good way to add documentation to a program.
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<P>
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Note that it is considered an error for a program to violate a
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declaration (such as a <tt>type</tt> declaration), but an implementation is
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not required to detect such errors (though such detection, where
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feasible, is to be encouraged).
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<P>
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<HR>
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<UL>
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<LI> <A NAME=tex2html2808 HREF="node104.html#SECTION001310000000000000000"> Declaration Syntax</A>
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<LI> <A NAME=tex2html2809 HREF="node105.html#SECTION001320000000000000000"> Declaration Specifiers</A>
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<LI> <A NAME=tex2html2810 HREF="node106.html#SECTION001330000000000000000"> Type Declaration for Forms</A>
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</UL>
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<HR>
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<P><ADDRESS>
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AI.Repository@cs.cmu.edu
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</ADDRESS>
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