C++ Video: Inheritance - Public, Protected, and Private
Every C++ programmer must have used public inheritance already, but not everyone has used protected or private inheritance. What are they? What's the usage of them, if any?
class yellowdog : private dog {
};
http://www.youtube.com/watch?v=EYuPBkgJtCQ
class yellowdog : private dog {
};
http://www.youtube.com/watch?v=EYuPBkgJtCQ
From: http://cplusplus.com/doc/tutorial/inheritance/
It means that public and protected members of dog are now private members of yellowdog.
Where is it useful? Let's say that you want to create a wrapper for the std::fstream class. You could choose to inherit from std::fstream. If you don't want the member functions to be available to the outside world, you could inherit it privately.
| This access specifier limits the most accessible level for the members inherited from the base class: The members with a more accessible level are inherited with this level instead, while the members with an equal or more restrictive access level keep their restrictive level in the derived class. |
It means that public and protected members of dog are now private members of yellowdog.
Where is it useful? Let's say that you want to create a wrapper for the std::fstream class. You could choose to inherit from std::fstream. If you don't want the member functions to be available to the outside world, you could inherit it privately.
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