Scala Question
Scala provide type information in subclassed generic function
Here is my problem.
I have an abstract class that defines a method with type parameters as input and output. I want the subclasses to provide the type information when subclassing but I want to do it in a way that I don't parametrize the whole class.
Some pseudo code of what I'm aiming at.
abstract class A {
def foo[T](t: T): T
}
class B() extends A {
override foo[Int](t: Int): Int = t + 1
}
class C() extends A {
override foo[Double](t: Double): Double = t + 1.0
}
How do I pass the type information on subclassing? I looked at similar problems. They address that with self types, type classes and abstract types.
Thanks
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Answer Source
As you've said, an abstract type on A can solve that:
abstract class A {
type T
def foo(t: T): T
}
class B extends A {
override type T = Int
override def foo(t: Int): Int = t + 1
}
class C extends A {
override type T = Double
override def foo(t: Double): Double = t + 1.0
}
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