Parametrized data class with variance

user_14675091 0
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I have such class

data class MyClass<T, out R>(
    val data: T? = null,
    val error: R? = null
)

But actually I want my error to extend Throwable, for example. How should I declare MyClass for this purpose?

kotlin generics
1 Answers

Just add Throwable constraint to R (see documentation):

data class MyClass<T, out R : Throwable>(
    val data: T? = null,
    val error: R? = null
)
user_101170560
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