Hi,
Besides the hack by Alan you might also want to think about an overflow save
implementation for roughly:
user=> (defn roughly
[expected-value delta]
(let [exp-pos? (pos? expected-value)
upper (if (neg? delta) (- delta) delta)
lower (- upper)]
(fn [tested-value]
(if (= (pos? tested-value) exp-pos?)
(< lower (- tested-value expected-value) upper)
(< lower (+ tested-value expected-value) upper)))))
#'user/roughly
user=> (+ 9223372036854775803 5)
ArithmeticException integer overflow clojure.lang.Numbers.throwIntOverflow
(Numbers.java:1374)
user=> ((roughly 9223372036854775804 5) 9223372036854775803)
true
user=> ((roughly 9223372036854775804 5) 9223372036854775500)
false
Sincerely
Meikel
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