The sample code below does not compile:
protocol RequestProtocol {
associatedtype Input
associatedtype Output
func evaluate(_: Input) -> Output
}
struct Evaluator<each Request: RequestProtocol> {
let item: (repeat each Request)
func query(_ input: repeat (each Request).Input) -> (repeat (each Request).Output) {
return (repeat (each item).evaluate(each input))
}
}
Code causes two compiler errors:
'each' cannot be applied to non-pack type '(repeat each Request)'
Pack expansion requires that 'each Request' and '()' have the same shape
Please advise.
seanwoodward
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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?
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