虚析构函数

#include <iostream>
#include <string>


using namespace std;


class Base{


public:

    virtual ~Base(){cout<<"Base destrutor"<<endl;}    ///虚析构函数

  /*再添加virtual的情况下，

Base* q = new Deriv();
       delete q;

如基类指针指向派生类，那么删除基类指针的时候将调用派生类指针和基类指针。

*/

};

class Deriv: public Base{


public:
    ~Deriv(){cout<<"Deriv destrutor"<<endl;}
};




class C: public Deriv{
    ~C(){ cout<<"C destrutor"<<endl;}
};


int main()
{
    Base* p = new Base();
    delete p;
    
    Base* q = new Deriv();
    delete q;
    
    Deriv* t = new C();
    delete t;
}