access private members in inheritance

Well, if you have access to base class, you can declare class B as friend class. But as others explained it: because you can, it does not mean it's good idea. Use protected members, if you want derived classes to be able to access them.

Private members of a base class can only be accessed by base member functions (not derived classes). So you have no rights not even a chance to do so :)

class Base

• public: can be accessed by anybody
• private: can only be accessed by only base member functions (not derived classes)
• protected: can be accessed by both base member functions and derived classes

Quick answer: You don't. Thats what the protected key-word is for, which you want to use if you want to grant access to subclasses but no-one else.

private means that no-one has access to those variables, not even subclasses.

If you cannot change code in A at all, maybe there is a public/protected access method for that variable. Otherwise these variables are not meant to be accessed from subclasses and only hacks can help (which I don't encourage!).