ensure(clojure.core)

Must be called in a transaction. Protects the ref from modification by other transactions. Returns the in-transaction-value of ref. Allows for more concurrency than (ref-set ref @ref)

; clojure/core.clj:1384
(defn ensure
  [#^clojure.lang.Ref ref]
    (. ref (touch))
    (. ref (deref)))

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