linked queue.h

链式队列

#include <iostream>
#include "node.h"

typedef char Queue_entry;

enum Error_code {success,overflow,underflow};

class Linkedqueue
{
public:
	/*these are standard queue methods*/
	Linkedqueue();
	bool empty()const;
	Error_code append(const Queue_entry &item);
	Error_code serve();
	Error_code retrieve(Queue_entry &item)const;
	/*these are safety featurs for linked structures*/
	~Linkedqueue();
	Linkedqueue(const Linkedqueue &original);
	void operator=(const Linkedqueue &original);
protected:
	Node *front,*rear;
};