[swift-users] Comparing POP to OOP

[Marco S Hyman]

>> You're going to use reference types in the *implementation* of any type
>> that has arbitrary growth.  Array uses a reference internally.
> 
> Actually we should be able to make a decent stack out of a value type without a reference type behind it.  Something like this:
> 
> enum Stack<T> {
>     case Empty
>     indirect case Node(T, next: Stack<T>)
     ^^^^^^^^

Uses a reference internally :)

Marc