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CLOS vs FLAVORS questions
Date: Wed, 29 Jan 1992 20:35 PST
From: Barry Margolin <barmar@Think.COM>
Disclaimer: I haven't actually done any nontrivial CLOS programming.
Date: Wed, 29 Jan 92 17:37:03 PST
Are CLOS programmers really able to use the dispatch-on-multiple-args
capability effectively? Does EQL dispatching get used in nontrivial
ways (same argument specialized sometimes by class, sometimes by a
I've been told that people use this to optimize some special cases. For
instance, one might write:
(defmethod plus ((x number) (y number))
(+ x y))
(defmethod plus ((x number) (y (eql 0)))
(defmethod plus ((x (eql 0)) (y number))
(defmethod plus ((x (eql 0)) (y (eql 0)))
I don't believe code like this will actually result in a speed improvement.
It's more likely to be used to dispose of inconventient special cases, and
to allow distributed specification of case handlers.