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Add signum function #108

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8 changes: 8 additions & 0 deletions src/bigints.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -178,6 +178,14 @@ func `==`(a: BigInt, b: int32): bool = cmp(a, b) == 0
func `<`(a: BigInt, b: int32): bool = cmp(a, b) < 0
func `<`(a: int32, b: BigInt): bool = cmp(a, b) < 0

func sgn*(a: BigInt): BigInt =
# Return the signum of `a`.
runnableExamples:
assert sgn(42.initBigInt) == 1.initBigInt
assert sgn(-12.initBigInt) == -1.initBigInt
assert sgn(0.initBigInt) == 0.initBigInt
return sgn(cmp(a, 0)).initBigInt

template addParts(toAdd) =
tmp += toAdd
a.limbs[i] = uint32(tmp and uint32.high)
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