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From: jas@cadre.dsl.PITTSBURGH.EDU (Jeffrey A. Sullivan)
Newsgroups: comp.lang.lisp,comp.sys.mac.programmer
Subject: Re: Anyone using pcl (clos) under Allegro Common Lisp?
Summary: I am, but PCL/CLOS is not fully optimized.  No comparisons
	 in speed, but power in CLOS is much higher.
Message-ID: <1205@cadre.dsl.PITTSBURGH.EDU>
Date: 19 May 88 19:11:29 GMT
References: <24158@ucbvax.BERKELEY.EDU>
Organization: Decision Systems Lab., Univ. of Pittsburgh, PA.
Lines: 26

In article <24158@ucbvax.BERKELEY.EDU>, mkent@dewey.soe.berkeley.edu (Marty Kent) writes:
> Another factor possibly in pcl's favor is that it's supposedly on the way to
> becoming a standard, while Object Lisp's future seems to be less than rosy...
> Do you feel pcl is in fact emerging as a standard like common lisp (I mean
> widely accepted like common lisp, not necessarily funky like common lisp :-)
> or are there other lisp object extension systems clearly "in the running?"
> 
Well, PCL is migrating toward a full implementaiton of CLOS (the Common Lisp
Object System), but it aint QUITE there yet.  It is, however, quite usable.
And very powerful.  I know that there have been some optimizations in it (I
read the code), but there are no broad-based ones, and I can not vouch for its
speed.  I am using PCL entirely in a project of mine, and haven't had
any complaints, but I am not concerned with efficiency at this time.

CLOS _is_ the standard OOPS for CL, so using it is no bad idea.  There
is no doubt that CLOS (of which PCL is slowly implemeting) is the only
OOPS officially supported by CL, so don't worry.

There is, however, a LOT of code to CLOS/PCL, and it takes quite a tot
of memory, while OL doesn't.  Note that OL's future is not so bad,
Coral will almost definitely implement a copy of OL in CLOS (it's not
too hard...) just for compatibility's sake.

-- 
..........................................................................
Jeffrey Sullivan			  | University of Pittsburgh
jas@cadre.dsl.pittsburgh.edu		  | Intelligent Systems Studies Program
jasper@PittVMS.BITNET, jasst3@cisunx.UUCP | Graduate Student