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From: fritzson@bigburd.PRC.Unisys.COM (Richard Fritzson)
Newsgroups: comp.sys.xerox
Subject: Re: PCL dfasls
Message-ID: <8711171529.AA23014@bigburd.PRC.Unisys.COM>
Date: Tue, 17-Nov-87 10:28:00 EST
Article-I.D.: bigburd.8711171529.AA23014
Posted: Tue Nov 17 10:28:00 1987
Date-Received: Thu, 19-Nov-87 20:33:18 EST
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>  From: SCHMIDT@SUMEX-AIM.STANFORD.EDU
>  Subject: PCL dfasls
>  Date: 17 Nov 87 06:13:34 GMT

>  	As I understand it--and I am no authority on this subject--PCL
>  is at present the closest portable object-oriented programming system
>  to CLOS, the pending Common Lisp Object System standard.  It seems to
>  be a close match to the functions described in section 2 of the
>  February CLOS specification (filed in CONCEP.DVI and FUNCTI.DVI).  

PCL is the closest thing to CLOS you can get, but, if you are just
starting out with the February CLOS spec and PCL, you might want to
know that the following functions, described in the CLOS spec, are
apparently not yet implemented:

	defgeneric-options
	defgeneric-options-setf
	class-changed
	make-generic-function
	define-method-combination
	make-method
	make-method-call
	method-qualifiers
	multiple-value-prog2
	method-combination-error
	invalid-method-error

Specifically, declarative method combination has not yet been implemented.

I'm not knocking PCL. We use it and very much appreciate having it.
I'm only posting this to help anyone who is just starting to use it
figure out what parts of CLOS are implemented in PCL.