libgimbal

I'm a huge academic fan of what GTk has accomplished (thanks to their GObject type system), and as much as I know the C89 crowd who thinks macros are all evil probably abhor this kind of thing, I think GTk is one of the most epic, impressive, ambitious C codebases in existence. Witness as non-OO C matches, rivals, and quite often beats Qt on equivalent classes/features in plain C... It's even above "just C++ style C," as they have added features like a property and signal system... I'm such a fanboy it inspired my own type system and massive core library, libgimbal, which uses a type system similar to GObject and targets game consoles like the Sega Dreamcast: https://github.com/gyrovorbis/libgimbal.

This book is an absolute classic. I came from C++20, using concepts and constraints, doing a lot of compile-time metaprogramming and shenanigans, and I set off on a quest to rewrite a lot of my core tech stack in plain ol' C ('17 revision) for language interoperability reasons... ...and I literally almost gave up on being a C programmer because of bashing my head against language limitations... This book completely and totally changed everything and is the reason I completed this very ambitious project (https://github.com/gyrovorbis/libgimbal)... It's not just good for object-oriented C, but also for approaching the C language differently in general. For pushing its boundaries rather than accepting its limitations. Anyway, this "PDF" was such an inspiration on me as a C programmer that I managed to track down a physical copy on Ebay. lol.

Here's a new library that provides OOP in C: https://github.com/gyrovorbis/libgimbal