class ComponentBuilder[X](a: X, b:X) {
  class ClassA[X](val v: X)
  class ClassB[X](val v: X)

  def buildA = new ClassA(a)
  def buildB = new ClassB(b)
}

val b = new ComponentBuilder[Int](1, 2)
println(b.buildA.v) // 1
println(b.buildB.v) // 2