error

$ clang table.c -std=c99 -ggdb
table.c:17:17: warning: incompatible pointer types initializing 'int *(*)(int *)' with an expression of type 'int *(*[2])(int *)' [-Wincompatible-pointer-types]
    for (int* (*manip)(int*) = manipulators; manip++; manip != NULL){
                ^              ~~~~~~~~~~~~
table.c:17:61: warning: inequality comparison result unused [-Wunused-comparison]
    for (int* (*manip)(int*) = manipulators; manip++; manip != NULL){
                                                      ~~~~~~^~~~~~~
table.c:17:61: note: use '|=' to turn this inequality comparison into an or-assignment
    for (int* (*manip)(int*) = manipulators; manip++; manip != NULL){
                                                            ^~
                                                            |=
2 warnings generated.

table.c

#include <stdio.h>
#include <stdlib.h>

int* do_nothing(int* in){
    puts("Ok");
    return in;
}

int* (*manipulators[])(int*) = {
    &do_nothing,
    NULL
};

int main(void) {
    int someptr = 5;

    for (int* (*manip)(int*) = manipulators; manip++; manip != NULL){
        manip(&someptr);
    }
    return 0;
}