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template forwardImpl*(impl, arg) {.dirty.} =
when sizeof(x) <= 4:
when x is SomeSignedInt:
impl(cast[uint32](x.int32))
else:
impl(x.uint32)
else:
when x is SomeSignedInt:
impl(cast[uint64](x.int64))
else:
impl(x.uint64)
# this could also be implemented via:
# import std/typetraits
# template castToUnsigned*(x: SomeInteger): auto = cast[toUnsigned(typeof(x))](x)
template castToUnsigned*(x: int8): uint8 = cast[uint8](x)
template castToUnsigned*(x: int16): uint16 = cast[uint16](x)
template castToUnsigned*(x: int32): uint32 = cast[uint32](x)
template castToUnsigned*(x: int64): uint64 = cast[uint64](x)
template castToUnsigned*(x: int): uint = cast[uint](x)
template castToUnsigned*[T: SomeUnsignedInt](x: T): T = x
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