There was a discussion in swift-evolution, starting at
https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160516/018521.html
about adding a "true modulo" operator to the standard library. There were
different opinions whether
- such a thing needs to be in the standard library at all, and if yes:
- if it should be an operator or function,
- how it should be named.
As far as I know, nothing happened until now. The above posting contains a
possible (Swift 3) implementation. In Swift 4 that would be
infix operator %%: MultiplicationPrecedence
func %%<T: BinaryInteger>(lhs: T, rhs: T) -> T {
return (lhs % rhs + rhs) % rhs
}
I would probably do (as an operator or as a function)
func %%<T: BinaryInteger>(lhs: T, rhs: T) -> T {
let rem = lhs % rhs // -rhs <= rem <= rhs
return rem >= 0 ? rem : rem + rhs
}
with one division instead of two.
Regards, Martin
> Am 09.11.2017 um 12:43 schrieb Jens Persson via swift-users
> <swift-users@swift.org>:
>
> Hi all!
> Is there a modulo operation/function in Swift? I want the "true" mathematical
> modulo (as % in Python), and not remainder (as % in Swift).
>
> Do I have to implement this basic mathematical function myself and if so what
> is the best way to write it (it will be heavily used so I want it to be as
> fast as possible)?
>
> /Jens
> _______________________________________________
> swift-users mailing list
> swift-users@swift.org
> https://lists.swift.org/mailman/listinfo/swift-users
_______________________________________________
swift-users mailing list
swift-users@swift.org
https://lists.swift.org/mailman/listinfo/swift-users
