Comment by adamrezich
18 hours ago
Correct, and you did ask specifically for OO things, but I thought I'd list namespaces too as far as “C++ things you might use when writing C-like C++ code”.
Another big one that I always forget C still doesn't support is function overloading.
Function overloading is a feature that makes code less self-documenting without providing any meaningful value. Operator overloading is more interesting, because you can build you domain language with nice syntax. But I also tend to think that this is not really worth it.
In C++ where you have methods? Sure. It would be nice to have in C, though. But, alas, ABI compatibility.