is there a way to write `foobar` so that I can pass ::class of either subclasses? <https://pl.kotl.i...

# announcements

[Karlo Lozovina]

is there a way to write foobar so that I can pass ::class of either subclasses? https://pl.kotl.in/Y5NcoKR3K

[Ruckus]

Neither Boy nor Girl subclass Parent in your example.

[Timo Gruen]

https://pl.kotl.in/FB0b6mBNH

[Timo Gruen]

Don’t know if I understood you correctly, but might be what you are searching for

[Karlo Lozovina]

forgot to make Boy/Girl subclasses of Parent in the example 🙂 in real code they are...

[Karlo Lozovina]

yup, I was missing the out modifier!

[Karlo Lozovina]

so that would mean that KClasses of A and B are in a subtyping relationship if A and B are in a subtyping relationship?

[Ruckus]

Yep: https://kotlinlang.org/docs/reference/generics.html#variance

[Timo Gruen]

I don’t think so. KClasses are not in a relationship. The generic is, so you are just telling the type system, that everything which comes in, must be at least of type person. But this doesn’t really create a relationship for the class object, as both are from type ‘KClass’ and only their generic type is from ‘A’ or ‘B’

[Timo Gruen]

Probably doesn’t make sense 🤦‍♂️

[Karlo Lozovina]

it kind of does! and it seems to work 😉