gistfile1.rb

class CompositeTask < Task
  def initialize(name)
super(name)
    @sub_tasks = []
  end
def add_sub_task(task) @sub_tasks << task task.parent = self
end
def remove_sub_task(task) @sub_tasks.delete(task) task.parent = nil
end
  def get_time_required
    time=0.0
    @sub_tasks.each {|task| time += task.get_time_required}
    time
end end