EnumerableEnum.swift

import Foundation

public protocol EnumerableEnum: RawRepresentable where RawValue == Int {
    
    static var firstIndex: Int { get }
    
}


public extension EnumerableEnum {
    
    static var firstIndex: Int { return 0 }
    
    static var all: [Self] {
        var index = firstIndex
        return Array(AnyIterator {
            defer { index += 1 }
            return Self(rawValue: index)
        })
    }
    
}