KINDLY USE THE FOLLOWING CODE AND IMPLEMENT THE FUNCTIONS WITHIN IT

class Node { public: Node(int value, Node* nextptr = NULL, Node* prevptr = NULL, int currentpriority = 0); int getVal(void); Node* getNext(void); Node* getPrev(void); void setVal(int value); void setPrev(Node* prevptr); void setNext(Node* nextptr); int getPriority(void); void setPriority(int priority); private: Node* next; Node* prev; int priority; int value; }; class Stack { public: Stack(void); ~Stack(void); void Push(int value); Node* NodePop(void); int Pop(void); private: Node* top; }; class Queue { public: Queue(void); ~Queue(void); void Enqueue(int i, int priority = 0); int Dequeue(void); protected: Node* back; Node* front; private: virtual Node* NodeDequeue(void); }; class Scheduler : public Queue { private: Node* NodeDequeue(void);