//
//
// "simulate" objects with inheritance ... 
//
//

def root() : (String, Int) => Int = {
  def printit(c: Int) = { print(c) ; println ; c }
  { (op, c) => {
    if (op equals "print") printit(c)
    else error("unknown op for root: " + op)
  }
 }
}

def makeCounter(): String => Int = { 
  var c = 0; 
  val mySuper = root();
  def incr = { c += 1 ; c }
  def decr = { c -= 1 ; c }
  def show = { c }
  {op => {
    if (op equals "up") incr
    else if (op equals "down") decr
    else if (op equals "show") show
    else mySuper(op,c)
  }
 }
}