And I would assert that every maintainable C program is fundamentally designed in a relatively object-oriented way (functions that operated on structured, polym

And I would assert that every maintainable C program is fundamentally designed in a relatively object-oriented way (functions that operated on structured, polymorphic function pointers, etc.) even if the original author wasn't particularly thinking in terms of classes or inheritance. That is in the eye of the beholder. I can well believe that you would look at the code and decide that the author wrote in an OO way. I also believe that there are plenty of authors of such code who would disagree with your assessment.