> AFAIK, it is not possible. You must implement all the different protocols. > It might look desapointing, but on the other hand it is not necessary. > (As there is no static typing in Clojure) > What is your use-case?
Current use case is that I want an abstraction which comprises of a set of operations I want + Comparable + Serializable > Just define types that extend all the protocols. > You can't. But you can define a type that extends both P and Comparable. Currently I'm struggling with the following problem - Suppose I consider something satisfying 'Coolness' property if it does x, y, z + is comparable + serializes. To do this I create a protocol 'OnlyHalfCoolness': (defprotocol OnlyHalfCooless x y z) and two deftypes Cool1, Cool2: (deftype Cool1 ... OnlyHalfCoolness .. Comparable .. Serializable) (deftype Cool2 ... OnlyHalfCoolness .. Comparable .. Serializable) Now I need to write a function: is-this-cool? Instead of (defn is-this-cool? [o] (satisfies? Coolness o)) I need to now write: (defn is-this-cool? [o] (or (instance? Cool1 o) (instance? Cool2 o)) or, (even worse) (defn is-this-cool? [o] (and (satisfies? OnlyHalfCoolness o) (instance? Comparable o) (instance? Serializable o)) A type hierarchy is not required - but I think a way to compose (atleast union) abstractions would be nice. Are there some fundamental problems with - (defprotocol Coolness .. Comparable .. Serializable .. x y z) ? > What do you mean by "static" functions? Normal functions which do not dispatch based on the type of their first argument. Forget about this - thinking more about it - they don't really make too much sense in protocols. -- 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
