C++ 模板应用 实现一个Queue 队列

#include<iostream>
using namespace std;
template <typename T>
class Queue
{
public:
	Queue()
	{
		Node<T> *node=new Node<T>();
		node->data=NULL;
		node->next=NULL;
		qfront=qrear=node;
	}
	template <typename T>
	struct Node
	{
		Node<T> *next;
		T data;
	};
	bool empty() const;
	void pop();
	T & front();
	T & back();
	void push(const T &);
	int size() const;
private:
	Node<T> *qfront,*qrear;
};
template <typename T>
T &Queue<T>::back()
{
	if(!empty())
		return qrear->data;
}
template <typename T>
T &Queue<T>::front()
{
	if(!empty())
	{
		Node<T> *p=qfront->next;
		return p->data;
	}
}
template <typename T>
bool Queue<T>::empty() const
{
	if(qfront==qrear)
		return true;
	else
		return false;
}
template <typename T>
void Queue<T>::pop()
{
	if(!empty())
	{
		Node<T> *p=qfront->next;
		qfront->next=p->next;
		if(p==qrear)
			qrear=qfront;
		delete p;
		p=NULL;

	}
}
template<typename T>
void Queue<T>::push(const T & t)
{
	Node<T> *node=new Node<T>;
	node->data=t;
	node->next=NULL;
	qrear->next=node;
	qrear=node;
}
template<typename T>
int Queue<T>::size() const
{
	Node<T> *p=qfront;
	if(empty())
		return 0;
	else
	{
		int i=1;
		while(p->next!=qrear)
		{
			p=p->next;
			i++;
		}
		return i;
	}
}

int main()
{
	Queue<int> q;
	q.push(1);
	q.push(2);
	q.pop();
	q.pop();
	q.pop();
	cout<<q.size()<<endl;
	getchar();
	return 0;
}