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71 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>28.1.6.4. Congruent Lambda-Lists for All Methods of a Generic Function</TITLE>
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<meta name="description" value=" Congruent Lambda-Lists for All Methods of a Generic Function">
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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=tex2html5171 HREF="node282.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html5169 HREF="node277.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html5163 HREF="node280.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html5173 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html5174 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html5172 HREF="node282.html"> Keyword Arguments in </A>
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<B>Up:</B> <A NAME=tex2html5170 HREF="node277.html"> Generic Functions and </A>
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<B> Previous:</B> <A NAME=tex2html5164 HREF="node280.html"> Agreement on Parameter </A>
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<HR> <P>
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<H3><A NAME=SECTION003216400000000000000>28.1.6.4. Congruent Lambda-Lists for All Methods of a Generic Function</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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<A NAME=CongruentLambdaListsforAllMethodsofaGenericFunctionSECTION>These</A>
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rules define the congruence of a set of lambda-lists, including the
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lambda-list of each method for a given generic function and the
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lambda-list specified for the generic function itself, if given.
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<P>
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<UL><LI> Each lambda-list must have the same number of required
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parameters.
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<P>
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<LI> Each lambda-list must have the same number of optional
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parameters. Each method can supply its own default for an optional
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parameter.
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<P>
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<LI> If any lambda-list mentions <tt>&rest</tt> or <tt>&key</tt>, each
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lambda-list must mention one or both of them.
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<P>
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<LI> If the generic function lambda-list mentions <tt>&key</tt>, each
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method must accept all of the keyword names mentioned after <tt>&key</tt>,
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either by accepting them explicitly, by specifying
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<tt>&allow-other-keys</tt>, or by specifying <tt>&rest</tt> but not <tt>&key</tt>.
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Each method can accept additional keyword arguments of its own. The
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checking of the validity of keyword names is done in the generic
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function, not in each method. A method is invoked as if the keyword
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argument pair whose keyword is <tt>:allow-other-keys</tt> and whose value
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is <tt>t</tt> were supplied, though no such argument pair will be passed.
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<P>
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<LI> The use of <tt>&allow-other-keys</tt> need not be consistent
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across lambda-lists. If <tt>&allow-other-keys</tt> is mentioned in
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the lambda-list of any applicable method or of the generic function,
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any keyword arguments may be mentioned in the call to the
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generic function.
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<P>
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<LI> The use of <tt>&aux</tt> need not be consistent across methods.
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</UL>
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<P>
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If a method-defining form that cannot specify generic function options
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creates a generic function, and if the lambda-list for the method
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mentions keyword arguments, the lambda-list of the generic function
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will mention <tt>&key</tt> (but no keyword arguments).
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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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<BR> <HR><A NAME=tex2html5171 HREF="node282.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html5169 HREF="node277.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html5163 HREF="node280.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html5173 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html5174 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html5172 HREF="node282.html"> Keyword Arguments in </A>
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<B>Up:</B> <A NAME=tex2html5170 HREF="node277.html"> Generic Functions and </A>
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<B> Previous:</B> <A NAME=tex2html5164 HREF="node280.html"> Agreement on Parameter </A>
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<HR> <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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