Comment by Koshkin

The practical usefulness of classes in C++ comes not from an "object-orientedness" that they supposedly give the language. It comes from the fact that they are merely a mechanism that can be used to create abstract data types, thereby providing a better encapsulation, and do many other things, rather than a policy saying that every object must be an instance of a class. So, one has to be careful when talking about classes, because they may effectively mean different things in different programming languages, even though on the surface they may look similar or appear to serve the same purpose.