1.3.0 permalink Arrow_down_16x16

unchecked-multiply

clojure.core

  • (unchecked-multiply x y)
Returns the product of x and y, both long.
Note - uses a primitive operator subject to overflow.

1 Example top

  • ;; the unchecked-multiply function silently overflows
    
    user=> (* 1000000000000 10)
    10000000000000
    user=> (unchecked-multiply 1000000000000 10)
    10000000000000
    
    user=> (* 3037000500 3037000500)
    ArithmeticException integer overflow  clojure.lang.Numbers.throwIntOverflow (Numbers.java:1424)
    user=> (unchecked-multiply 3037000500 3037000500)
    -9223372036709301616
    
    
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Plus_12x12 Minus_12x12 Source clojure/core.clj:1161 top

(defn unchecked-multiply
  "Returns the product of x and y, both long.
  Note - uses a primitive operator subject to overflow."
  {:inline (fn [x y] `(. clojure.lang.Numbers (unchecked_multiply ~x ~y)))
   :added "1.0"}
  [x y] (. clojure.lang.Numbers (unchecked_multiply x y)))
Vars in clojure.core/unchecked-multiply:
Used in 0 other vars

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