Hands-On Design Patterns with Swift

Conformance at declaration

The first method to declare a conformance is to do it at the top level, when you declare your custom type. You'll notice that the raw representation comes first, then the protocol conformance:

enum State: Int, Toggling {    case off = 0    case on        mutating func toggle() {        self = self == .on ? .off : .on    }}var state: State = .onstate.toggle()assert(state == .off)