It doesn t matter how you instantiate it that function says kotlinlang #announcements

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Title

r

Ruckus

02/22/2018, 2:44 PM

It doesn't matter how you instantiate it, that function says N is a

BaseNavigator

. Unless

BaseNavigator

is a subclass of

NavigationController

(it's not, you have it the other way around), that won't compile.

y

yuriy.stetsyk

02/22/2018, 3:02 PM

Doesn't

N : BaseNavigator

states that N should inherit BaseNavigator?

r

Ruckus

02/22/2018, 4:42 PM

Yes, but your

navigation

is specifically a

NavigationController

, and you can't guarantee the

factory

passed into

is generic over

NavigationController

, only

BaseNavigator

.

@Andreas Sinz showed a perfect example of where that could fail (I was about to type my own here when I saw that one)

For your function to work without changing the

navigation

, you'd need something like:

fun <F, V, P> f(factory: NavigationFactory<F, V, P, NavigationController>)
        where F : Fragment,
              F : BaseView<V, P>,
              V : BaseView<V, P>,
              P : NavigatorPresenter<V, P, NavigationController>{
    factory.with(navigation)
}

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