#include<iostream>
class base
{
public:
virtual ~base(){std::cout << "base\n";}
};
class derived : public base
{
private:
~derived(){std::cout << "derived\n";} /* destructor is private */
};
int main()
{
base *pt= new derived;
delete pt;
}
解决方法
这不仅会发生在析构函数中.
#include<iostream>
class base
{
public:
virtual void x(){std::cout << "base\n";}
};
class derived : public base
{
private:
void x(){std::cout << "derived\n"; base::x();}
};
int main()
{
base *pt= new derived;
pt->x(); //OK
//((derived *)pt)->x(); //error: ‘virtual void derived::x()’ is private
derived *pt2= new derived;
//pt2->x(); //error: ‘virtual void derived::x()’ is private
((base *)pt2)->x(); //OK
}
