虚析构函数

#include <iostream.h>class Base{public:virtual ~Base(){  //如果不声明为虚析构函数，则只能析构基类，派生类不能析构，造成内存泄露cout<<"Base destructor\n";}};class Derived:public Base{public:Derived();~Derived();private:int *i_pointer;};Derived::Derived(){i_pointer=new int(0);}Derived::~Derived(){cout<<"Derived destructor\n";delete i_pointer;}void fun(Base *b){delete b;}int main(){Base *b=new Derived();fun(b);}