An example with `::` (bound callable reference?). ...

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[ghedeon]

An example with :: (bound callable reference?). Any way to properly import Companion so I don't see it in the code?

class Foo(bar: () -> Bar)

class Bar {
    companion object {
        fun newInstance() = Bar()
    }
}
....
Foo(Bar.Companion::newInstance) //<--- works
Foo(Bar::newInstance) //<--- doesn't work

[Ruckus]

No, as those have different meaning. Bar::newInstance is a reference to a function on Bar.

[Ruckus]

You could do this (though it feels a bit of a hack and changes the semantics considerably):

class Bar {
    companion object : () -> Bar {
        override fun invoke() = Bar()
    }
}

Foo(Bar)

[ghedeon]

probably won't use it but I'm glad I've seen it)