Question

For example:
I have an implementation (say doSomething()) in Base class.

I want all the Derived classes to use only this implementation, and not to override the base class implementation.

How can I force this behavior in C++?

Answer 1

If you only want to implement it in the base class, then don’t declare it virtual, and it can’t be overridden at all.

In C++11 you can declare an override final in a similar way to Java:

virtual void doSomething() final;
                           ^^^^^

In C++03 and earlier, you can’t; that’s why it was added to C++11.