Classes (3)

Parameterized classes can be defined in Bobbee:

class Circle <T> {
  # A circular list of items of type T.
  var values : ArrayList<T>;
  var index : integer = 0;
  def this (this.values);
  def add (newValues : T ...) : void :> values ++= newValues;
  def [index : integer] : T :>
    if length values == 0 then null
    else values [index % length values];
  def next () : T :>
    if length values == 0 then null
    else values [(index +.= 1) % length values];
}