> On Mar 27, 2017, at 1:48 PM, Adrian Zubarev via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> Assuming we’ll get that functionality, both var and let should satisfy the
> protocol requirements right?
>
In theory, there’s no reason not to allow that.
> If it is valid, could we potentially get optional functions in pure Swift as
> well?
>
>
I mean, you can already do this:
protocol P {
var optionalRequirement: ((Int) -> ())? { get }
}
extension P {
// “default implementation"
var optionalRequirement: ((Int) -> ())? { return nil }
}
struct A : P {}
struct B : P {
let optionalRequirement: ((Int) -> ())? = { (x: Int) in print(x) }
}
But it’s kind of tacky.
If you think about it, “optional requirement” is an oxymoron. What’s your
use-case?
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