> (defn death > [host] > (dosync > (if (not (empty? @host)) > nil)))
The agents initial value is a ref. Sometimes you set it to nil. nil cannot be dereferenced. Perhaps you meant to set the ref to nil (if (not-empty @host) (ref-set host nil)). However I think you've gone a little off track mixing agents and refs like this. The value of an agent is already thread safe, so there is no need to protect it with a ref. (def myagent (agent 5)) (defn death [host] (if host nil)) (send death myagent) > (defn death > [host] > (dosync > nil)) This just returns nil all the time, no deref is done. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
