为什么在保护模式下继承向上转换不起作用

Question

When i am inheriting class in protected mode why Derived* to Base* is failing

class Base { };

class Derived : protected Base { };

int main()
{
   Base* b = new Derived(); // compile error
}

Answer 1

Access to the baseclasses is the same as access to any member. From the outside, access is simply forbidden. Only privileged code (code that can access other protected or even private parts) can access the baseclass in that way.