Hi, how can I set a function abstract for a compan...
# getting-starteda
Ayfri
07/12/2021, 5:44 AMHi, how can I set a function abstract for a companion object of a class ?
s
Shawn
07/12/2021, 6:01 AMhow would that work? are you trying to do something that’d look like this?
Copy code
class Foo {
companion object {
abstract fun bar() {}
}
}a
Ayfri
07/12/2021, 6:19 AMYeah exactly, but without braces for the
bare
ephemient
07/12/2021, 6:23 AMcompanion/singleton objects can't be extended, so what would that even mean?
a
Ayfri
07/12/2021, 8:00 AMthe class also has to be abstract I forgot
d
diesieben07
07/12/2021, 2:16 PMThe companion object is still a singleton and cannot be extended
d
Dave K
07/12/2021, 5:53 PMYou 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
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