Is there a way to require a method to take in a pa...
# announcementsa
Allan Wang
08/29/2018, 4:34 PMIs there a way to require a method to take in a param that is a data class?
Is there a way to require a class to have a companion object that implements an interface?
I remember seeing the latter somewhere and there were compile time warnings.
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Shawn
08/29/2018, 4:41 PMIs there a way to require a method to take in a param that is a data class?No. Data classes are not part of any specific type hierarchy of their own. You cannot extend the notion of a data class or specify an interface that represents all data classes.
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Ruckus
08/29/2018, 4:41 PMIs there a way to require a class to have a companion object that implements an interface?No, that doesn't really make any sense.
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karelpeeters
08/29/2018, 5:31 PMAnd think about it: why do want a data class? There's nothing inherently special about them.
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Allan Wang
08/29/2018, 7:56 PMI’ve thought of that. The main reason I’d use this is to imply that classes should have data equality, or perhaps readable toString() output. Data classes don’t guarantee that and you can definitely accomplish that without data classes, but it may still be a nice to have.
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karelpeeters
08/29/2018, 8:52 PMNope, that's all just implementation details. Code should not depend on stuff like that.
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