>From clojure.org/protocols : " if one interface is derived from the other, the more derived is used, else which one is used is unspecified."
Since multi-methods use "isa?" and not "=" perhaps use multi-methods and specify order via "prefer-method"? Timothy On Mon, Jun 2, 2014 at 6:57 AM, Phillip Lord <phillip.l...@newcastle.ac.uk> wrote: > > > How does Clojure decide which Protocol implementation to call. > > I ask because I have tried this code: > > > (defprotocol Fred > (fred [item])) > > (extend-type CharSequence > Fred > (fred [item] "charseq")) > > (extend-type Comparable > Fred > (fred [item] "comparable")) > > (extend-type java.io.Serializable > Fred > (fred [item] "serializable")) > > > (fred "hello") > > > With lein repl it seems to return charseq everytime. With CIDER it gives > different results. With lein repl on windows, again, different results > with different JVM invocations. > > Should this not be consistent? > > Phil > > -- > 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. > -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- 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.
