I guess we've been using different frameworks. It's certainly true that the OO-frameworks provide interfaces to derive from. But others have templates to work w

I guess we've been using different frameworks. It's certainly true that the OO-frameworks provide interfaces to derive from. But others have templates to work with. In fact, the standard library does both (e.g., customizing streams via do_get() and do_put(); and providing new iterator types via std::iterator<>).