虚析构函数

#include <iostream>
#include <cstdio>
#include <string>
using namespace std;

class Base{
public:
    virtual ~Base(){
        cout<<"Base deconstruct func"<<endl;
    }
};

class Derive: public Base{
public:
    ~Derive(){
        cout<<"Derive deconstruct func"<<endl;
    }
};

int main()
{
    Derive *p = new Derive();
    delete p;
    //使用派生类指针指向派生类，会自动调用基类析构函数
    
    Base *p1 = new Derive();
    delete p1;
    //使用基类指针指向派生类，只有当基类析构函数定位为虚函数的时候，才会自动调用派生类析构函数，然后在调用基类的析构函数 与虚函数表有关

    system("pause");
    return 0;
}