On Wed, Sep 14, 2011 at 2:21 PM, Mark Rathwell <mark.rathw...@gmail.com> wrote: > The distinction is that you type hint function parameters to tell the > compiler that this function parameter will always be of the specified > type. You coerce something that may or may not be of a desired type, > but is known to cleanly convert to that type. > > So: > > (defn add-two [^long x] > (+ x 2)) > ;=> #'user/add-two > > (add-two (long 1.2)) > ;=> 3 >
Should have noted that obviously calling 'add-two' with 1.2 would coerce to long, but the point is about what the code is saying (if it could talk). > On Wed, Sep 14, 2011 at 2:03 PM, Sergey Didenko > <sergey.dide...@gmail.com> wrote: >> What is the intended difference between type hinting like "^long" and >> type coercing like "(long arg)"? >> >> For example my gut feeling for this case is to use ^long but it is forbidden: >> >> (loop [^long x 0] >> ...) >> >> "Can't type hint a local with a primitive initializer" >> >> So I use >> >> (loop [x (long 0)] >> ...) >> >> But not quite sure if it's right. >> >> -- >> 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 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
