CODE:

#include 

class CTask{
public:
	int Element;
	CTask *Next;
	CTask *Prev;

	CTask(CTask *Prev, int Element){
		this->Prev = Prev;
		this->Element = Element;
	}

	void InsertNext(CTask *Next){
		this->Next = Next;
	}

	void InsertPrev(CTask *Prev){
		this->Prev = Prev;
	}

	void PrintElement(){
		printf("%d\n", this->Element);
	}
};

class CList{
private:
	CTask *ActiveTask;
	CTask *PassiveTask;
public:
	CList(int max){
		int i;
		CTask *task;

		ActiveTask = new CTask(ActiveTask, 0);
		ActiveTask->InsertNext(ActiveTask);

		PassiveTask = new CTask(NULL, 0);
		for(i=1, task=PassiveTask; iNext){
			task->InsertNext(new CTask(NULL, i));
		}
	}

	~CList(){
		CTask *task1 = NULL, *task2 = NULL;
		
		for(task1 = ActiveTask->Next; task1!=ActiveTask; task1=task2){
			task2 = task1->Next;
			delete task1;
		}
		delete ActiveTask;

		for(task1 = PassiveTask; task1!=NULL; task1=task2){
			task2 = task1->Next;
			delete task1;
		}
	}
};

int main(void){
	CList *List;

	List = new CList(10);

	getchar();
	return 0;
}