How make implicit Ordered on java.time.LocalDate

Question

I want to use java.time.LocalDate and java.time.LocalDateTime with an implicit Ordered like:

val date1 = java.time.Loc         


        

Answer 1

A slight modification to the implicit ordered should do the trick.

type AsComparable[A] = A => Comparable[_ >: A]

implicit def ordered[A: AsComparable]: Ordering[A] = new Ordering[A] {
  def compare(x: A, y: A): Int = x compareTo y
}

Now every type which is comparable to itself or to a supertype of itself should have an Ordering.