Article View: comp.lang.clos
Article #556Re: Extending syntax/semantics of method specializers
From: Len Charest
Date: Mon, 23 Nov 1992 19:21
Date: Mon, 23 Nov 1992 19:21
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1741 bytes
In article <1992Nov23.113551@disun47.epfl.ch>, matomira@disun47.epfl.ch (Fernando Mato Mira) writes:
|> The current implemention of CLOS does not allow for the creation of generic
|> classes, that is, classes where slot types are determined by type parameters.
|> Under the current implementation, this inhibits the creation of type
|> specifiers in the style of "(list integer)" for user-defined classes.
[ generic classes proposal deleted]
Generic classes would go a long way towards extending the expressiveness of
DEFMETHOD. However, they would not cover all of the discrimination strategies I
mentioned in my original post--especially the one I find most attractive: method
selection based on the *value* of a variable. To wit:
(defun interesting-value-p (x)
(eq x *interesting-value*))
(defmethod observe ((thing (satisfies interesting-value-p)))
...)
..................................................
Len Charest, Jr.
JPL Artificial Intelligence Group
charest@aig.jpl.nasa.gov
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Newsgroups: comp.lang.clos Path: arc1-ca.pugleaf.net!sparky!uunet!elroy.jpl.nasa.gov!ufo!Aig.Jpl.Nasa.Gov!charest From: charest@Aig.Jpl.Nasa.Gov (Len Charest) Subject: Re: Extending syntax/semantics of method specializers Message-ID: <1992Nov23.192133.10895@jpl-devvax.jpl.nasa.gov> Sender: usenet@jpl-devvax.jpl.nasa.gov (For NNTP so rrn will be able to post) Nntp-Posting-Host: ai-cyclops Reply-To: charest@aig.jpl.nasa.gov Organization: NASA/Jet Propulsion Laboratory References: <1992Nov20.221251.28590@jpl-devvax.jpl.nasa.gov> <9211210425.AA12235@verdi.iisd.sra.com> <1992Nov23.113551@disun47.epfl.ch> Date: Mon, 23 Nov 1992 19:21:33 GMT Lines: 22