That's correct, the most specialized implementation is used. In the case where more there is no implementation more specialized than another (two interfaces are extended to a protocol and a class implements both) then an arbitrary implementation from the available ones will be selected.
Extending a Object and nil to a protocol is a good way to provide a default impl. Another option is to wrap the protocol functions in another function and testing for satisfies?. Il giorno 17/nov/2014 10.49, "pmf" <phil.fr...@gmx.de> ha scritto: > Is there a way to provide a default (fallback) implementation for a method > defined in a defprotocol directive? I do realize that I could extend the > protocol for type java.lang.Object, but this raises the question about how > protocol implementations with extend are sorted, i.e. how specializations > of types of the same hierarchy are resolved. Is the most specialized > implementation used if I implement a protocol for a class as well as its > parent class and if yes, is this independent of the order of definition for > the protocol extensions? > > -- > 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 > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- 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 --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
