Is there a a way to achieve closures in C

by

Using FFCALL,

#include <callback.h>
#include <stdio.h>
static void incrementer_(int *in) {
    ++*in;
}
static void emitter_(int *in) {
    printf("%d\n", *in);
}
int main() {
    int in1 = 10, in2 = 20;
    int (*incrementer1)() = alloc_callback(&incrementer_, &in1);
    int (*emitter1)() = alloc_callback(&emitter_, &in1);
    int (*incrementer2)() = alloc_callback(&incrementer_, &in2);
    int (*emitter2)() = alloc_callback(&emitter_, &in2);
    incrementer1();
    incrementer2();
    emitter1();
    emitter2();
    free_callback(incrementer1);
    free_callback(incrementer2);
    free_callback(emitter1);
    free_callback(emitter2);
}

But usually in C you end up passing extra arguments around to fake closures.

Apple has a non-standard extension to C called blocks, which do work much like closures.

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