Swift: Generic method for enumerating all values of an enum of type Int

gistfile1.swift

enum Reindeer: Int {
    case Dasher, Dancer, Prancer, Vixen, Comet, Cupid, Donner, Blitzen, Rudolph
    
    static var allValues: [Reindeer] { 
      return allValuesGenerator({ Reindeer(rawValue: $0) }) 
    }
}

func allValuesGenerator<T>(fromValue: Int -> T?) -> [T] {
    return Array(
        SequenceOf {
            () -> GeneratorOf<T> in
            var i = 0
            return GeneratorOf<T> {
                return fromValue(i++)
            }
        }
    )
}