On Thu, Jun 13, 2013 at 10:52 AM, Jim - FooBar(); <jimpil1...@gmail.com>wrote:
> On 13/06/13 18:47, Jim - FooBar(); wrote: > >> On 13/06/13 18:28, Leon Barrett wrote: >> >>> It shouldn't be necessary to examine the source to know what's going on >>> in a builtin, really, but I also encountered this one recently. The way the >>> extend-protocol macro finds which entries are types and which are function >>> definitions is by checking which are lists. >>> >> >> I'm not sure I follow...if we can't have lists that evaluate to Class >> objects then how am I able to succesfully use (Class/forName "[D") as the >> first extension but not in any other position? >> should I be using (eval (Class/forName "[D")) so the macro definitely >> receives a Class? >> >> You say you've encountered this a lot...can you elaborate? what did you >> do? > > If you want to understand why it behaves the way it does, then I do encourage you to read the source(clj/clojure/core_deftype.clj). Basically, it knows the first thing is a type and then uses (take-while seq?) to find that type's methods. extend-protocol is a macro that expands to a bunch of extend-type calls. Just make a bunch of extend-type calls, or make your own macro that makes a bunch of extend-type calls. >> many many thanks, >> >> Jim >> >> >> >> >> > or can you perhaps show an example of successfully extending any protocol > to at least 2 primitive array types? > > > Jim > > -- > -- > 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+unsubscribe@**googlegroups.com<clojure%2bunsubscr...@googlegroups.com> > For more options, visit this group at > http://groups.google.com/**group/clojure?hl=en<http://groups.google.com/group/clojure?hl=en> > --- You received this message because you are subscribed to a topic in the > Google Groups "Clojure" group. > To unsubscribe from this topic, visit https://groups.google.com/d/** > topic/clojure/0TJ-Kl3CsDk/**unsubscribe<https://groups.google.com/d/topic/clojure/0TJ-Kl3CsDk/unsubscribe> > . > To unsubscribe from this group and all its topics, send an email to > clojure+unsubscribe@**googlegroups.com<clojure%2bunsubscr...@googlegroups.com> > . > For more options, visit > https://groups.google.com/**groups/opt_out<https://groups.google.com/groups/opt_out> > . > > > -- -- 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/groups/opt_out.
