- attr _time_list: Array[Couple[Int, WakeUpNode]]
- attr _time: Int = 0 # What time is it ?
- meth add_event(n: WakeUpNode, d: Int)
+ var _time_list: Array[Couple[Int, WakeUpNode]] = new Array[Couple[Int, WakeUpNode]]
+ var _time: Int = 0 # What time is it ?
+ fun add_event(n: WakeUpNode, d: Int)