[swift-evolution] [swift-users] Implementing signum

[Jacob Bandes-Storch]

On Sat, Nov 19, 2016 at 11:59 PM, Adrian Zubarev via swift-evolution <
swift-evolution at swift.org> wrote:

> From some older evolution-thread:
>
> 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
>

Just played with this and it turns out that due to the implicit nature of
IntegerLiteralConvertible, you don't need any of the "as Self"s:

extension SignedNumber{
    var sign: Self {
        if self == 0 {
            return 0
        } else if self > 0 {
            return 1
        }
        return -1
    }
}
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