实现自动delete？

main.cpp

#include <iostream>
#include"person.h"
using namespace std;

int main()
{
    Person* p = new Person(100);
    p->printPerson();

    smartPointer sp(new Person(200));
    sp.mp->printPerson();
    sp->printPerson();
    //delete p;
    //加入用户忘记delete p
    cout << "Hello World!" << endl;
    return 0;
}

Person.h

#ifndef PERSON_H
#define PERSON_H

#include<iostream>
using namespace std;
class Person
{
private:
    int num;
public:
    Person();
    Person(int num)
    {
        this->num =num;
    }
    ~Person()
    {

        cout<<"xigou"<<endl;
    }
public:
    void printPerson(void)
    {
        cout<<"num= "<<num<<endl;
    }
};
class smartPointer
{
public:
    Person* mp;
public:
    smartPointer(Person* p)
    {
        mp = p;
    }
    ~smartPointer()
    {
        if(mp != NULL)
        {
            cout<<"smartxigou"<<endl;
            delete mp;
        }
    }
    Person* operator->()
    {
        return mp;
    }
    Person operator*()
    {
        return *mp;
    }
};

#endif // PERSON_H