Question

I’m learning Scala and there is a thing that I can’t find out about the language:

Some time ago I was very comfortable programming in Lisaac, and in Lisaac I could write a class PERSON with a slot list:ARRAY[SELF], which was equivalent to have list:ARRAY[PERSON], since SELF is the type of the object where that slot is.

But by using SELF, if I write a second class STUDENT that inherits from PERSON, then STUDENT would inherit that slot changing SELF for STUDENT, so STUDENT would have a list of STUDENT instead of PERSON.

Can that be done in Scala? I can´t find out anything about that.

Thanks!

Answer 1

I’m not sure if this will actually be useful to you, but the closest thing I can think of is this.type. E.g:

scala> class A { val l: List[this.type] = Nil }  
defined class A

scala> new A().l
res3: List[A] = List()

scala> class B extends A
defined class B

scala> new B().l
res4: List[B] = List()