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fixes isPowerOfTwo returning true on the smallest integer

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Koala Zen
2015-05-06 12:37:15 -07:00
parent b9e02b1efc
commit cf68d926d8
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.