clojure.core/unchecked-inc

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Type: function Added: Clojure 1.0 Examples: 2 Runnable: 1

([x])

Returns a number one greater than x, a long. Note - uses a primitive operator subject to overflow.

Examples

by boxie on 2010-11-08 ▶

(unchecked-inc Integer/MAX_VALUE) -2147483648 (unchecked-inc 0) 1

by svenschoenung on 2017-02-25 . May have evaluation errors. ▶

;; Illustrates the difference between (inc), (inc') and (unchecked-inc) ;; The "N" suffix denotes a BigInt instance ;; https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/BigInt.java Long/MAX_VALUE ;;=> 9223372036854775807 (inc Long/MAX_VALUE) ;;=> ArithmeticException integer overflow clojure.lang.Numbers.throwIntOverflow (Numbers.java:1501) (inc' Long/MAX_VALUE) ;;=> 9223372036854775808N ;; Notice how the resulting number becomes NEGATIVE: (unchecked-inc Long/MAX_VALUE) ;;=> -9223372036854775808

See also

• clojure.core/unchecked-add
• clojure.core/unchecked-dec (1)
• clojure.core/unchecked-inc (1)
• clojure.core/unchecked-negate
• clojure.core/unchecked-divide
• clojure.core/unchecked-subtract
• clojure.core/unchecked-multiply
• clojure.core/unchecked-remainder
• clojure.core/inc (2)
• clojure.core/inc' (0)

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