Is it possible to make a class non extendable???
make all elements/members private or use final keyword

final is not supported by C++, i guess,

and making all elements/member private will not solve the problem. we can still inherit the class, but we cannot Access the base class variable in extended class.
final is a C++11 keyword that marks a virtual function as the final override.

I don't know about non-extendable, but you can protect your class's data members by keeping them private. That way, any derivation would be forced to use your class's interface to modify anything.
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