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Message from discussion Jython vs. CL...
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Dave Bakhash  
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 More options May 5 2002, 2:28 pm
Newsgroups: comp.lang.lisp
From: ca...@alum.mit.edu (Dave Bakhash)
Date: 5 May 2002 11:28:42 -0700
Local: Sun, May 5 2002 2:28 pm
Subject: Re: Jython vs. CL...
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hey,

"Frank A. Adrian" <fadr...@ancar.org> wrote in message <news:bQ%A8.4257$JG4.234907@news.uswest.net>...

> Dave Bakhash wrote:

> > Method combination is another feature that's very specific to CLOS,
> > and I would argue that 99% of programs don't use it, and of the 1%
> > that do, at least half are probably using it wrong (or just using it
> > for the sake of saying they're using a non-standard method
> > combination).

> Not really.

> One example - I was doing an optimization system.  I wanted users to
> construct optimizations simply.  One of the trickier areas was optimization
> terminations.  You can decide to terminate an optimization on many criteria
> - timeout, failure to progress, "good enough" solution found, etc., or a
> combination of these items.

I appreciate your testimony of an application of method combination.
I personally endorse using method combination in situations where you
want define a function based on all of the information about the
arguments.

Let's take a scenario where we use not only method combination, but
multi-methods.  Then you have:

(define-method-combination optimization-combination ...)
(defgeneric optimize (x y)
  (:method-combination optimization-combination)
  ...)

If it's clear that your OPTIMIZE function wants to see the complete
class graph of X and Y, and the corresponding methods defined on those
class combinations, then all the power to you; you have demonstrated a
capability that CL has for an interesting and unique situation.
Bravo! (I'm clapping for you.)

What about the situation of needing an LDAP interface?  Try
implementing a (Tight)VNC viewer in CL.  Do you know what you're up
against?

dave


 
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