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1.3.0

compare-and-set!

clojure.core

(compare-and-set! atom oldval newval)

Atomically sets the value of atom to newval if and only if the
current value of the atom is identical to oldval. Returns true if
set happened, else false

1 Example top

link | changes
```
user=> (def a (atom 0))
#'user/a
user=> (compare-and-set! a 10 20)
false
user=> @a
0
user=> (compare-and-set! a 0 10)
true
user=> @a
10
```
user=> (def a (atom 0)) #'user/a user=> (compare-and-set! a 10 20) false user=> @a 0 user=> (compare-and-set! a 0 10) true user=> @a 10

Source clojure/core.clj:2111 top

(defn compare-and-set!
  "Atomically sets the value of atom to newval if and only if the
  current value of the atom is identical to oldval. Returns true if
  set happened, else false"
  {:added "1.0"
   :static true}
  [^clojure.lang.Atom atom oldval newval] (.compareAndSet atom oldval newval))

Vars in clojure.core/compare-and-set!:

Used in 0 other vars

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Clojure Core

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compare-and-set!

clojure.core

1 Example top

See Also top

Source clojure/core.clj:2111 top

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