Can I just make mention another implementation in case you are not already aware of it; Matthew Wilson's from his STLSoft libraries
http://www.stlsoft.org/doc-1.9/group__group____library____properties.html
Though the main documentation for it is possibly only available in his Imperfect C++ book.
Thanks for the link. I've been able to implement a better version than the first I posted. Now there are just TWO pointers to member functions per class, not per object. So every property has a pointer to an object and the pointers to member functions are shared. The properties can be virtual as well. You need to initialize non-trivial properties with this pointer. You can also initialize it with the this pointer and a value, but you don't need to initialize in the runtime parameters the getters and setters anymore.