[eridius]

That's not a function, that's a closure. And you can simulate that in C by creating a struct that contains the function pointer and the set of captured data (and then when you invoke the function you pass the struct to it as a parameter).

[junke]

Yes, hence the distinction between first-class features and others, which you have to implement yourself.

[eridius]

The parent comment said C function pointers aren't functions. They are. They just aren't closures.