How in Swift specify type constraint to be enum?

Question

I want to specify a type constraint that the type should be a raw value enum:

enum SomeEnum: Int {
  case One, Two, Three
}

class SomeProtocol

        

Answer 1

enum SomeEnum: Int {
    case One, Two, Three
}

class SomeClass{
    func doSomething(e: E) {
        print(e.rawValue)
    }
}

class SomeEnumClass : SomeClass {

}

or directly

class SomeOtherClass{
    func doSomething(e: E) {
        print(e.rawValue)
    }
}

UPDATE for swift3:

enum SomeEnum: Int {
    case One, Two, Three
}

class SomeClass where E.RawValue == Int {
    func doSomething(e: E) {
        print(e.rawValue)
    }
}

class SomeEnumClass : SomeClass {

}

resp.

class SomeOtherClass{
    func doSomething(e: E) where E.RawValue == Int {
        print(e.rawValue)
    }
}