struct MyStruct {
  enum Test: Int {
    case a
  }
  enum AnotherTest: Int {
    case b
  }
}

let myThing: TYPE = someFunction(parameter)
myThing.a //if TYPE is Test.self
myThing.b //if TYPE is AnotherTest.self

struct MyStruct {
  enum Test: Int {
    case a
    case b
  }
}