This should do the trick:
extension SignedNumberType {
var sign: Self {
if self == (0 as Self) {
return (0 as Self)
} else if self > (0 as Self) {
return (1 as Self)
}
return (-1 as Self)
}
}
--
Adrian Zubarev
Sent with Airmail
Am 22. Mai 2016 bei 09:08:37, Adam Nemecek via swift-evolution
([email protected]) schrieb:
Howdy,
I think that the SignedNumberType should implement a method called sign that
will return -1 for negative numbers, 0 for 0 and 1 for positive numbers. This
is similar to the signum method in e.g. Java and similarly called methods in
other languages.
The implementation is fairly straight forward
extension SignedNumberType {
var sign: Self {
if self == 0 {
return 0
}
else if self > 0 {
return 1
}
return -1
}
}
I was trying to implement is without branching by doing (x > 0) - (x < 0) but I
couldn't get the types right so I'm open to suggestions.
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