On 14 Dec, 2010, at 19:47 , Stuart Sierra wrote: > On Dec 14, 2:31 am, Konrad Hinsen <konrad.hin...@fastmail.net> wrote: >> That's actually what clojure.contrib.complex-numbers already uses! And >> it's based on multimethods, not protocols, because of all those binary >> operations. > > It is possible, though not trivial, to do 2-argument dispatch with > protocols. See http://paste.lisp.org/+2023 for an example. I have no > idea how well this performs compared to multimethods.
Interesting idea, a double dispatch hidden behind a couple of macros. It would be interesting indeed to compare its efficiency to a multimethod-based solution. The latter retains one advantage though: it is possible to dispatch arbitrary n-ary functions. In particular, it is possible to have unary and binary versions of +, - etc. But I suppose your protocol-based solution can be extended in that way as well. Konrad. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
