What kind of inheritance is this? I see it in Compose <docs>, but can't find its usage on Kotlin doc...

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[Mehdi Haghgoo]

What kind of inheritance is this? I see it in Compose docs, but can't find its usage on Kotlin docs. Can a subclass (object) be defined inside the parent class?

[Mehdi Haghgoo]

sealed class Screen(val route: String, @StringRes val resourceId: Int) {
    object Profile : Screen("profile", R.string.profile)
    object FriendsList : Screen("friendslist", R.string.friends_list)
}

[Marc Knaup]

It’s normal inheritance.
The only difference is that you can be sure that Profile and FriendsList are the only subclasses of Screen and there are no others. That’s because it’s sealed.

https://kotlinlang.org/docs/sealed-classes.html

[Mehdi Haghgoo]

I don't know why the linked doc does not have an example like the given snippet.