Swift Language Protocols Using the RawRepresentable protocol (Extensible Enum)
Example
// RawRepresentable has an associatedType RawValue.
// For this struct, we will make the compiler infer the type
// by implementing the rawValue variable with a type of String
//
// Compiler infers RawValue = String without needing typealias
//
struct NotificationName: RawRepresentable {
let rawValue: String
static let dataFinished = NotificationNames(rawValue: "DataFinishedNotification")
}
This struct can be extended elsewhere to add cases
extension NotificationName {
static let documentationLaunched = NotificationNames(rawValue: "DocumentationLaunchedNotification")
}
And an interface can design around any RawRepresentable type or specifically your enum struct
func post(notification notification: NotificationName) -> Void {
// use notification.rawValue
}
At call site, you can use dot syntax shorthand for the typesafe NotificationName
post(notification: .dataFinished)
Using generic RawRepresentable function
// RawRepresentable has an associate type, so the
// method that wants to accept any type conforming to
// RawRepresentable needs to be generic
func observe<T: RawRepresentable>(object: T) -> Void {
// object.rawValue
}
