C++: any way to prevent any instantiation of an abstract base class?

Question

Aside from having a pure virtual function, is there a way to prevent an instantiation of an abstract base class?

I can do this:

class BaseFoo
{
    virtu         


        

Answer 1

A really obvious way is to declare a protected constructor, and to declare public constructors in the non-abstract derived classes.

This of course shifts the burden of corectness to the derived classes, but at least the base class is protected.