Seeref-set for more.
user=>(defcross-thread-mutable(ref{}))#'user/cross-thread-mutableuser=>cross-thread-mutable#<Refclojure.lang.Ref@1a5f739>user=>
user=> (def foo (ref 0)) #'user/foo user=> foo #<Ref clojure.lang.Ref@7c2479a4> user=> @foo 0 user=> (ref-set foo 1) java.lang.IllegalStateException: No transaction running (NO_SOURCE_FILE:0) user=> (dosync (ref-set foo 1)) 1 user=> @foo 1
(deref (ref 5))@(ref 5)@(atom 5)(with-local-vars [x 5] @x)@(agent 5)
(def df (delay (println "hello")))(println "world")--> world(force df)--> hello
(def employee-records (ref #{}))(dosync (commute employee-records conj "employee"))