Hi, how can I set a function abstract for a companion object of a class ?

how would that work? are you trying to do something that’d look like this?

class Foo {
  companion object {
    abstract fun bar() {}
  }
}

Yeah exactly, but without braces for the

bar

function logically

companion/singleton objects can't be extended, so what would that even mean?

the class also has to be abstract I forgot

The companion object is still a singleton and cannot be extended

You can make an interface that the companion implements but you’d still need to remember to implement the interface explicitly on the concrete class, no way to have abstract class enforce that concrete’s companion does anything Main benefit of having an interface is so that all of the concretes’ companions have the same function similar to having an abstract fun would do, at the class level