C++——链表的实现以及迭代器

#include <iostream>

using namespace std;

class MyList{
   
   
public: 
		MyList():head(NULL){
   
   
	}
	~MyList(){
   
   
		while(head){
   
   
			Node *temp;
			temp = head;
			head = head->next;
			delete temp;	 
		}
	}
public:
	struct Node{
   
   
		Node(int x, Node *ptr=NULL)