Code below from the video: Generalize APIs with parameter packs
protocol RequestProtocol {
associatedtype Input
associatedtype Output
func evaluate(_ input: Input) -> Output
}
struct Evaluator<each Request: RequestProtocol> {
var item: (repeat each Request)
func query(
_ input: repeat (each Request).Input
) -> (repeat (each Request).Output) {
return (repeat (each item).evaluate(each input))
}
}
The Evaluator
declaration causes a compiler error, "Generic types with parameter packs are experimental". Is there a switch or flag to enable use of parameter packs?
Does,
-enable-experimental-feature VariadicGenerics
apply?What is the correct means to apply
-enable-experimental-feature VariadicGenerics
to a Swift package? The flag seems to work when set inSwift Compiler - Custom Flags>Other Swift Flags
in Build Settings of an iOS app.