42 lines
2.4 KiB
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42 lines
2.4 KiB
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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>28.1.7.3. Declarative Method Combination</TITLE>
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<meta name="description" value=" Declarative Method Combination">
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<meta name="keywords" value="clm">
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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=tex2html5233 HREF="node287.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html5231 HREF="node283.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html5225 HREF="node285.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html5235 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html5236 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html5234 HREF="node287.html"> Built-in Method Combination </A>
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<B>Up:</B> <A NAME=tex2html5232 HREF="node283.html"> Method Selection and </A>
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<B> Previous:</B> <A NAME=tex2html5226 HREF="node285.html"> Standard Method Combination</A>
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<HR> <P>
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<H3><A NAME=SECTION003217300000000000000>28.1.7.3. Declarative Method Combination</A></H3>
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<P>
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<img align=bottom alt="change_begin" src="gif/change_begin.gif"><br>
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The macro <tt>define-method-combination</tt> defines new forms of method
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combination. It provides a mechanism for customizing the production
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of the effective method. The default procedure for producing an
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effective method is described in
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section <A HREF="node284.html#DeterminingtheEffectiveMethodSECTION">28.1.7.2</A>.
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There are two forms of
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<tt>define-method-combination</tt>. The short form is a simple facility;
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the long form is more powerful and more verbose. The long form
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resembles <tt>defmacro</tt> in that the body is an expression that
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computes a Lisp form; it provides mechanisms for implementing
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arbitrary control structures within method combination and for
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arbitrary processing of method qualifiers. The syntax and use of both
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forms of <tt>define-method-combination</tt> are explained in
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section <A HREF="node311.html#FunctionsintheProgrammerInterfaceSECTION">28.2</A>.
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<br><img align=bottom alt="change_end" src="gif/change_end.gif">
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<P>
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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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</BODY>
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