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Implicit widening conversions #109

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Implicit widening conversions #109

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8 changes: 4 additions & 4 deletions src/bigints.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@ func initBigInt*(vals: sink seq[uint32], isNegative = false): BigInt =
result.isNegative = isNegative
normalize(result)

func initBigInt*[T: int8|int16|int32](val: T): BigInt =
converter initBigInt*[T: int8|int16|int32](val: T): BigInt =
if val < 0:
result.limbs = @[(not val).uint32 + 1] # manual 2's complement (to avoid overflow)
result.isNegative = true
Expand All @@ -40,7 +40,7 @@ func initBigInt*[T: int8|int16|int32](val: T): BigInt =
func initBigInt*[T: uint8|uint16|uint32](val: T): BigInt =
result.limbs = @[val.uint32]

func initBigInt*(val: int64): BigInt =
converter initBigInt*(val: int64): BigInt =
var a = val.uint64
if val < 0:
a = not a + 1 # 2's complement
Expand All @@ -57,10 +57,10 @@ func initBigInt*(val: uint64): BigInt =
result.limbs = @[val.uint32]

when sizeof(int) == 4:
template initBigInt*(val: int): BigInt = initBigInt(val.int32)
converter initBigInt*(val: int): BigInt = initBigInt(val.int32)
template initBigInt*(val: uint): BigInt = initBigInt(val.uint32)
else:
template initBigInt*(val: int): BigInt = initBigInt(val.int64)
converter initBigInt*(val: int): BigInt = initBigInt(val.int64)
template initBigInt*(val: uint): BigInt = initBigInt(val.uint64)

func initBigInt*(val: BigInt): BigInt =
Expand Down