scala is better stronger faster

PointBarre.scala

/**
 * Created with IntelliJ IDEA.
 * User: evantill
 * Date: 01/07/13
 * Time: 12:22
 * To change this template use File | Settings | File Templates.
 */
object PointBarre extends App {

  case class Point2D(x: Int, y: Int) {
    def add(p: Point2D) = Point2D(x + p.x, y + p.y)
  }

  object Point2D {
    implicit def toPoint3D(p: Point2D) = Point3D(p.x, p.y, 0)
  }

  case class Point3D(x: Int, y: Int, z: Int) {
    def add[T <% Point3D](p: T) = Point3D(x + p.x, y + p.y, z + p.z)
  }

  val p1 = Point2D(1, 2)
  val p2 = Point3D(1, 2, 3)

  Console.println(p1 add p1)
  Console.println(p1 add p2)
  Console.println(p2 add p1)
  Console.println(p2 add p2)

}

Tu peux enlever le : [T <% Point3D](p: T) et remplacer par (p:Point3D)