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kotlinlang

Hello all. I have a question I'm unsure how to google. Is it possible to have a function which takes as a parameter `anything that extends x` ? For example I have a data class here (using tornadofx library, it provides the ViewModel class) which I would like for the lamda to take anything which extends a ViewModel. ```data class CustomMenuItem (val name: String, val action: (E ? extends ViewModel) -&gt; Unit)```

`action: (ViewModel) -&gt; Unit` passes that requirement.

That is what I had before, but after passing in a "NameModel" class which extends a ViewModel it says a ViewModel was required, not a NameModel.

Nevermind, sorry my question was not what I was really needing to know. I had my colleague help me with it and he told me the same thing you did and then I realized I was doing everything the wrong way lol. Thank you though.