negate-exact (clj)

function

(negate-exact a)

Returns the negation of a, throws ArithmeticException on overflow. See: https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#negateExact-long-

Examples

clojure

(ns clojure.test-clojure.math
  (:require
    [clojure.test :refer :all]
    [clojure.math :as m]))

(deftest test-negate-exact
  (is (= (inc Long/MIN_VALUE) (m/negate-exact Long/MAX_VALUE)))
  (try
    (m/negate-exact Long/MIN_VALUE)
    (is false)
    (catch ArithmeticException _
      (is true))))