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// rarray_fast_set, rarray_fast_get
struct point {
    int x, y, z;
};
struct rarray array = { .size = sizeof(struct point), .base = NULL };
int len = 16;
// you could also call `rarray_grow()` to increase "capacity" only
rarray_setlen(&array, len);
struct point *ptr = rarray_fast_get(&array, struct point, 0);
for (int i = 0; i < len; i++) {
    *ptr++ = (struct point){ i, i, i };
}
for (int i = 0; i < len; i++) {
    struct point *ptr = rarray_fast_get(&array, struct point, i);
    assert(ptr->x == i && ptr->y == i && ptr->z == i);
}
rarray_discard(&array);