How are optional values implemented in Swift?

Question

I wonder how the value types in Swift (Int, Float...) are implemented to support optional binding (\"?\"). I assume those value types are not allocated on the heap, but on t

Answer 1

Optionals are implemented as enum type in Swift.

See Apple's Swift Tour for an example of how this is done:

enum OptionalValue {
    case None
    case Some(T)
}