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abstract class AbsFun[@specialized T, @specialized U] {
// abstract function, fully specialized
def apply(x: T): U
// abstract function, specialized
def sum(xs: List[T]): Int
def prod(xs: List[T], mul: (Int, T) => Int): Int =
(1 /: xs)(mul)
// concrete function, not specialized
def bar(m: String): String = m
// abstract function, not specialized
def abs(m: Int): Int
}
class Square extends AbsFun[Int, Int] {
def apply(x: Int): Int = x * x
def sum(xs: List[Int]): Int =
(0 /: xs) (_ + _)
def abs(m: Int): Int =
sum(List(1, 2, 3))
}
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