(require 'ns-a) will 'install' the namespace ns-a in the clojure environment. If ns-a has other namespaces that it requires ... they will also be installed for ns-a to be fully functional.
(use 'ns-a) will not only 'install' the namespace ns-a, but also create mappings for all public vars of namespace ns-a in the current namespace (the mappings will have the same name as the vars in ns-a). An example may help understand : ; file ns-b (ns ns-b) (defn b1 [] "importable") (defn- b2 [] "non importable") ; file ns-a (ns ns-a (:require ns-b)) (defn a1 [] (ns-b/b1)) ; file ns-c (ns ns-c (:use ns-a)) (defn c1 [] (b1)) ;; and from the REPL user> (require 'ns-b) user> (b1) ==> wil generate an error since ns-a is just required (there is no a1 user> (ns-b/b1) ==> will work user> (ns-b/b2) ==> will not work since b2 is namespace private user> (use 'ns-b) ==> will work unless namespace 'user already has a var or mapping with name b1 user> (b1) ==> will work, is now equivalent to (ns-b/b1) user>(b2) ==> will not work, 'use does not create mappings for namespace private vars HTH, -- Laurent 2009/8/24 CuppoJava <patrickli_2...@hotmail.com> > > Laurent would you mind explaining what is the difference between > require and use? I don't understand the documentation for those > functions. > > Thanks a lot > -Patrick > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
