How to make class not derivable at all. is there any way?

Question

Hi any one let me know How to make class not derivable at all. is there any way? please let me know. regards Hara

Answer 1

See this explanation on how do to it, and why it might not be a good idea, by Bjarne Stroustrup (creator of C++ himself).

Answer 2

If your class has a private constructor, there is no way for a derived class to be instantiated.

See "How can I set up my class so it won't be inherited from?" on the C++ FAQ Lite.

Answer 3

A similar question on SO was asked here

Answer 4

Make the constructor private.

Answer 5

Make the ctor(s) private.

class not_derivable { private: not_derivable(){} };

class derived : public not_derivable {};

int main() { derived d; // diagnostic }

or the dtor:

class not_derivable { private: ~not_derivable(){} };

class derived : public not_derivable {};

int main() { not_derivable *nd = new not_derivable; derived d; //diagnostic }