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A few years ago Peterpaul developed a lightweight object-oriented system on top of C that was really pleasant to use[0].

No need to pass in the object explicitly, etc.

Doesn't have the greatest documentation, but has a full test suite (e.g., [1][2]).

[0] https://github.com/peterpaul/co2

[1] https://github.com/peterpaul/co2/blob/master/carbon/test/pas...

[2] https://github.com/peterpaul/co2/blob/master/carbon/test/pas...

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For people wondering what it looks like without the syntactic sugar of carbon then look here [0]. As far as I can see, there's no support for parametric polymorphism.

0. https://github.com/peterpaul/co2/tree/master/examples/my-obj...

Doesn't look much different than GLib the base for the GTK implementation (and other things in GNOME, the GNU Network _Object_ Model Environment).

Objects yes, classes and inheritance no. Just interfaces please.

I feel like Vala tries to fit in this niche too.

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