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protocol Observed: AnyObject {
}
struct Other<Value: Equatable> {
var value: Value
func hello() -> String {
return "Hello from \(value)"
}
}
@propertyWrapper
struct Observable<Value: Equatable> {
private var stored: Value
init(wrappedValue: Value) {
self.stored = wrappedValue
}
var wrappedValue: Value {
get { fatalError("called wrappedValue getter") }
set { fatalError("called wrappedValue setter") }
}
var projectedValue: Other<Value> {
get { fatalError("called projectedValue getter") }
set { fatalError("called projectedValue setter") }
}
static subscript<EnclosingSelf: Observed, FinalValue>(
_enclosingInstance observed: EnclosingSelf,
wrapped wrappedKeyPath: ReferenceWritableKeyPath<EnclosingSelf, FinalValue>,
storage storageKeyPath: ReferenceWritableKeyPath<EnclosingSelf, Self>
) -> Value {
get {
fatalError("blah")
}
set {
}
}
static subscript<EnclosingSelf: Observed>(
_enclosingInstance observed: EnclosingSelf,
projected wrappedKeyPath: ReferenceWritableKeyPath<EnclosingSelf, Other<Value>>,
storage storageKeyPath: ReferenceWritableKeyPath<EnclosingSelf, Self>
) -> Other<Value> {
get {
fatalError("blah")
}
set {
}
}
}
|
