removeLast method

E removeLast ()
override

Removes and returns the last element of the queue.

The queue must not be empty when this method is called.

Implementation 

E removeLast() {
  if (_head == _tail) throw new StateError("No element");
  _tail = (_tail - 1) & (_table.length - 1);
  E result = _table[_tail];
  _table[_tail] = null;
  return result;
}