虚析构函数

Class Base{

Base(){};

virtual ~Base(){cout<<"Do Base destructor "<<endl;

}

Class Derived :public Base{

Derived(){};

~Derived(){cout<<"Do Derived destructor"<<endl;

}

Base *ptext= new Derived ;

delete ptext;

上面输出

 Do Derived destructor

若去掉virtual

则不输出，即子类的析构函数没用被调用。