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Merge pull request #2665 from koalazen/fix_math_is_power_of_two

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fixes isPowerOfTwo returning true on the smallest integer
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Varriount 2015-05-07 12:54:37 -04:00
commit d882718882
1 changed files with 1 additions and 1 deletions
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lib/pure/math.nim
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@ -85,7 +85,7 @@ proc fac*(n: int): int {.noSideEffect.} =
proc isPowerOfTwo*(x: int): bool {.noSideEffect.} =
## returns true, if `x` is a power of two, false otherwise.
## Zero and negative numbers are not a power of two.
return (x != 0) and ((x and (x - 1)) == 0)
return (x > 0) and ((x and (x - 1)) == 0)
proc nextPowerOfTwo*(x: int): int {.noSideEffect.} =
## returns `x` rounded up to the nearest power of two.