1.野指针

2.智能指针unique_ptr

3.共享指针shared_ptr

4.弱指针weak_ptr

#include <iostream>
#include <memory>using namespace std;/*
* 1.野指针
* 2.智能指针unique_ptr
* 3.共享指针shared_ptr
* 4.弱指针weak_ptr
* */class stu{
public:stu(){cout<<"构造函数"<<endl;}~stu(){cout<<"析构函数"<<endl;}
};int main() {int *p0;int *p = new int(5);cout << "p="<<*p << endl;delete p;cout <<"p=" <<*p << endl;unique_ptr<int> pun(new int(3));cout << "pun="<< *pun << endl;unique_ptr<int> pun2 = move(pun);
// cout << "pun="<< *pun<< endl; //指针没有指向任何地址,取值报错cout << "pun2="<<*pun2<< endl;pun2.reset();pun2.reset(new int(5));int * p2 = pun2.get();cout << "p2="<< *p2<< endl;shared_ptr<stu> sh(new stu());cout << "当前指针的计数="<< sh.use_count() << endl;shared_ptr<stu> sh2 = sh;sh.reset();sh2.reset();int *pr = new int(10);shared_ptr<int> spa(pr);cout<< "sp="<< spa.use_count()<<endl;weak_ptr<int> wp(spa);cout<< wp.use_count()<<endl;shared_ptr<int> sp03 = wp.lock();return 0;
}