Derived classes in C - What is your favorite method?

Question

In my experience in object oriented C programming I have seen two ways to implement derived classes.

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First Method, have a definition of the pa

Answer 1

At a former job, we used a preprocessor to handle this. We declared classes using a simple C++-style syntax, and the preprocessor generated C headers that were basically equivalent to the First Method, but without the #includes. It also did cool things like generating vtables and macros for upcasting and downcasting.

Note that this was in the days before good C++ compilers existed for all the platforms we targeted. Now, doing this would be stupid.