genqueue.h

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//**********************  genQueue.h  *************************
//     generic(一般) queue implemented with doubly linked list 

#ifndef LINKED_QUEUE
#define LINKED_QUEUE

template <class T> 
class Node {
//friend LinkedQueue<T>;
public: 
    T data;
    Node <T>  * link; 
};

template <class T> 
class  LinkedQueue {
public: 

    LinkedQueue( ){front=rear=0; }
    ~LinkedQueue( ); 
    bool IsEmpty()  { return front==0;}
    bool IsFull();
    T First();
    T Last();
    void enqueue(const T& x);
    void dequeue(T& x);
private:
    Node<T>  *front;
    Node<T>  *rear;
};

template < class T > 
void LinkedQueue< T> :: enqueue( const T & x ) {
    Node<T> *p=new Node<T>;
    p->data=x;
    p->link=0;
    if ( front)     // 队列不为空
        rear->link=p;
    else           //  队列为空
        front=p;
   rear=p;
   //return *this;
 }

template < class T > 
void LinkedQueue<T>::dequeue(T& x) 
{
   if(IsEmpty()) 
         { cout<<"out of bounds"; return ;} 
   x=front->data;
   Node < T > * p = front;
    front =  front -> link; 
    delete p;
    //return *this;
	return ;
}



#endif