on Mon Jan 30 2017, Brent Royal-Gordon <swift-evolution@swift.org> wrote:
>> On Jan 29, 2017, at 10:07 PM, Dave Abrahams <dabrah...@apple.com> wrote:
>>
>>>>> It might make a great deal of sense to support bitwise operations on
>>>>> this type,
>>>>
>>>> I think that's a model of SetAlgebra, then, isn't it?
>>>
>>> Hmm, arguably. It's a shame that we won't be able to use it with
>>> things like `OptionSet`, though.
>>
>> Why not? That conforms to SetAlgebra.
>
> I mean that `OptionSet.RawValue` currently has to conform to
> `BitwiseOperations`,
Actually it doesn't. You just have to implement these yourself in that
case:
extension OptionSet where Self.RawValue : BitwiseOperations {
convenience init()
mutating func formUnion(_ other: Self)
mutating func formIntersection(_ other: Self)
mutating func formSymmetricDifference(_ other: Self)
}
> but would now need to conform to `BinaryInteger` (or a sub-protocol).
Does that limit you in some useful way?
--
-Dave
_______________________________________________
swift-evolution mailing list
swift-evolution@swift.org
https://lists.swift.org/mailman/listinfo/swift-evolution
