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What would be a set of nifty preprocessor hacks (ANSI C89/ISO C90 compatible) which enable some kind of ugly (but usable) object-orientation in C?
I am familiar with a few different object-oriented languages, so please don’t respond with answers like "Learn C++!". I have read "Object-Oriented Programming With ANSI C" (beware: PDF format) and several other interesting solutions, but I’m mostly interested in yours :-)!
C Object System (COS) sounds promising (it’s still in alpha version). It tries to keep minimal the available concepts for the sake of simplicity and flexibility: uniform object oriented programming including open classes, metaclasses, property metaclasses, generics, multimethods, delegation, ownership, exceptions, contracts and closures. There is a draft paper (PDF) that describes it.
Exception in C is a C89 implementation of the TRY-CATCH-FINALLY found in other OO languages. It comes with a testsuite and some examples.
Both by Laurent Deniau, which is working a lot on OOP in C.