Swift enum -> Get an array of all cases

RawRepresentableExtension

extension RawRepresentable where Self: Hashable {
    
    private static func iterateEnum<T: Hashable>(_: T.Type) -> AnyIterator<T> {
        var index = 0
        
        let closure: () -> T? = {
            let next = withUnsafePointer(to: &index) {
                $0.withMemoryRebound(to: T.self, capacity: 1) { $0.pointee }
            }
            guard next.hashValue == index else { return nil }
            index += 1
            return next
        }
        
        return AnyIterator(closure)
    }
    
    static var allValues: [Self.RawValue] {
        return iterateEnum(self).map { $0.rawValue }
    }
    
    static var allCases: [Self] {
        return iterateEnum(self).map { $0 }
    }
}