Konrad Hinsen a écrit : > On 03.03.2009, at 00:53, Laurent PETIT wrote: > > >> I'm able to do that from the REPL when done one by one : >> (clojure.core/ns-unmap *ns* (quote filter)) >> (clojure.core/defn filter [] "oh my!") >> >> thus correctly redefining the binding of filter for the rest of use >> by the ns >> >> But I can't manage to get it work from a macro (indeed not even >> when directly called inside a do) : >> >> (do (clojure.core/ns-unmap *ns* (quote filter)) (clojure.core/defn >> filter [] "my map!")) >> >> What is wrong with me ? (Something with def I still haven't >> understood, I think) >> > > I can only confirm your observation, and say that I don't understand > it either! > In the first case, when you enter the second statement at the repl, filter is unmapped already so the compiler understands that it must create a var and intern it as my-ns/filter. In the second case, both statements are bundled in one expression: when the expression is compiled filter is still mapped in the current ns and the compiler refuses to compile the def form.
Adding an eval can make that works: (do (clojure.core/ns-unmap *ns* (quote filter)) (eval '(clojure.core/defn filter [] "my map!"))) but it may be simpler to explore doing something like this: (do (clojure.core/ns-unmap *ns* (quote filter)) (clojure.lang.Var/intern *ns* 'filter (fn[] "my map!"))) Christophe -- Professional: http://cgrand.net/ (fr) On Clojure: http://clj-me.blogspot.com/ (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 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 -~----------~----~----~----~------~----~------~--~---
