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fix for comparing infinities (#16122)

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Antonis Geralis 2020-11-25 11:15:34 +02:00 • committed by GitHub
commit e220f756e7
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lib/pure/math.nim
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@ -177,6 +177,17 @@ proc almostEqual*[T: SomeFloat](x, y: T; unitsInLastPlace: Natural = 4): bool {.
runnableExamples:
doAssert almostEqual(3.141592653589793, 3.1415926535897936)
doAssert almostEqual(1.6777215e7'f32, 1.6777216e7'f32)
doAssert almostEqual(Inf, Inf)
doAssert almostEqual(-Inf, -Inf)
doAssert almostEqual(Inf, -Inf) == false
doAssert almostEqual(-Inf, Inf) == false
doAssert almostEqual(Inf, NaN) == false
doAssert almostEqual(NaN, NaN) == false
if x == y:
# short circuit exact equality -- needed to catch two infinities of
# the same sign. And perhaps speeds things up a bit sometimes.
return true
let diff = abs(x - y)
result = diff <= epsilon(T) * abs(x + y) * T(unitsInLastPlace) or
diff < minimumPositiveValue(T)