import scala.math.Ordering.IntOrdering


// Define instantiable integer orderings
class RealIntOrdering extends IntOrdering {}

class ReverseIntOrdering extends Ordering[Int] {
  val realIntOrdering = new RealIntOrdering()
  def compare(x: Int, y: Int): Int = -realIntOrdering.compare(x, y)
}


// Test stuff
val values = List(1,2,6,3,4)

val ord: Ordering[Int] = new RealIntOrdering()
values.min(cmp = ord)
values.sorted(ord = ord)

val reverseOrd = new ReverseIntOrdering()
values.min(cmp = reverseOrd)
values.sorted(ord = reverseOrd)