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/gist:b75be902b2b578e2e55b Secret

Created January 4, 2013 22:22
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gistfile1.clj
(defn get-instance [m k]
(if (contains? @m k) (get @m k)
(dosync
(if-let [v (get m k)] v
(let [newV (create-some-instance)]
(alter m assoc k newV)
newV)))))
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