[Boost-users] Enforcing CRTP with the MPL?

Hi there Having a templatized base class B template<class T> class B ..... is it possible to enforce that a class D can derive from B IF AND ONLY IF the curiously recurring template pattern is applied, that is class D1 : public B<D1> ... // ok, compile class D2 : public B<X> ... // not ok, do not compile ??? Thx Stefan