Is it possible to forbid deriving from a class at compile time?

Question

I have a value class according to the description in \"C++ Coding Standards\", Item 32. In short, that means it provides value semantics and does not have any virtual method

Answer 1

If you are willing to only allow the class to be created by a factory method you can have a private constructor.

class underivable {
    underivable() { }
    underivable(const underivable&); // not implemented
    underivable& operator=(const underivable&); // not implemented
public:
    static underivable create() { return underivable(); }
};