While I agree the common pattern is to use void*/dynamic dispatch, this is not necessary. E.g., https://github.com/glouw/ctl/ https://github.com/glouw/ctl/ or

While I agree the common pattern is to use void*/dynamic dispatch, this is not necessary. E.g., https://github.com/glouw/ctl/ https://github.com/glouw/ctl/ or https://github.com/c-blake/bst https://github.com/c-blake/bst show a couple ways to have generic code statically specialized in regular old C. (Instantiation/specialization is just marginally less automatic/syntactically supported.)