全部。我无法理解为什么下面的代码需要演员表才能工作。有人可以解释一下吗？
class Base {
};
class Derived : public Base {
};
class Class {
public:
Derived member;
};
...
Derived obj;
Base *ptrObj = &obj; // ok, no cast needed
Derived Class::* ptr = &Class::member; // ok
Base Class::* ptr = &Class::member; // wrong, need cast, why?