Type Classes in Kotlin?

[cedricbeust]

FYI, I just posted a few thoughts on this topic:

"Extension types" for Kotlin

Nat wrote a good summary of Kotlin on his blog recently and this remark in particular: However, there’s no way to write a generic function that sums its parameters, because add is not defined on an interface that can be used as an upper bound. I wonder if we could extend the concept of “extension functions” to types (“extension types”?). For example, I could define an adder interface: interface Addable<T> { fun add(a: T, b: T) } and then specify that the existing class Int implements A…