Hi all, i get an unchecked cast warning on this co...

# announcements

[uli]

Hi all, i get an unchecked cast warning on this code:

typealias Factory<T> = () -> T

    private fun Bundle.getViewModelFactory(): (() -> VIEWMODEL)? {
        val serializable = getSerializable(ARG_VIEWMODEL_FACTORY)
        return serializable as? Factory<VIEWMODEL>
    }

Shouldn't as? take care of this?

[cypher121]

as? still gives the warning for some reason, think that's a bug

[Dico]

At runtime, the type parameter cannot be checked I think. That's what the warning is about.

[uli]

Thanks. That is it.

[cypher121]

oh yeah, that makes sense. it'll check if it's a Function0, but not if it's Function0<VIEWMODEL>. that's fair

[Evan R.]

If you turn the getViewModelFactory method into a reified function it should get rid of the warning because the type will be known at runtime

[uli]

Did you try? I suppose reified makes the type known at compile time

[Dico]

Reified makes the type known at runtime

[Dico]

You can't check generic types using is or as