Yes, so while this technique would be harder to adopt for a library, or at least harder on the users, for an application where you don't really need to worry about people using C calling into your code, it would be fairly useful. A short HOWTO on how to call from C using the necessarily included and emulated C++ vtable bits would make calling in from C possible and easier where required, but you could still reap the benefits of non-C features while sticking with a C toolchain at the lowest level.