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I have a class A, which have a field val declared as private. I want to declare a class B, that inherit from A and have an access to val. Is there a way to do it on C++?
I want to do it because I need to overload some functions of A, without changing A code at all.
Thanks.
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public, protected and private inheritance in C++ protected inheritance makes the public and protected members of the base class protected in the derived class. private inheritance makes the public and protected members of the base class private in the derived class.
You need to define it as protected . Protected members are inherited to child classes but are not accessible from the outside world. after inheriting protected members, you can provide public access. then we should avoid to keep personal data in protected access specifier.
A class in C++ has public, private and protected sections which contain the corresponding class members. Protected members in a class are similar to private members as they cannot be accessed from outside the class. But they can be accessed by derived classes or child classes while private members cannot.
Private Members in a SuperclassA subclass does not inherit the private members of its parent class. However, if the superclass has public or protected methods for accessing its private fields, these can also be used by the subclass.
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!).
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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
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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.
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