#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; }
原文地址:http://blog.csdn.net/cq361106306/article/details/39640059