An array of functions that return functions that return void :>

funcfuncarray.c

/* (C) 2017 Sebastian Büttner <sebastian.buettner@iem.thm.de> */

#include <stdio.h>

/* This is about functions returning functions that return void and take no arguments (see below). */

void func()
{
  printf("func()\n");
}

/* Approach A 
 *
 * Messing things up...
 */

/* A function that returns a function that retuns void... */
void (*(func_a)())()
{
  return &func;
}

void test_a()
{
  /* An array (of unspecified length) of functions returning functions that return void */
  void (*(*f[])())() = {
    &func_a,
    &func_b
  };
  int i;

  for (i = 0; i < 2; i++)
    f[i]()();
}


/* Approach B 
 *
 * Using typedefs to keep simple return and variable types and the code readable.
 */

/* A function ptr that returns void */
typedef void (*fn_void_t)();
/* A function ptr type that returns fn_void_t (see above) */
typedef fn_void_t (*fn_fnvoid_t)();

/* A function that returns fn_void_t (see above) */
fn_void_t func_b()
{
  return &func;
}

void test_b()
{
  /* An array of fn_fnvoid_t (see above) */
  fn_fnvoid_t g[] = {
    &func_a,
    &func_b
  };
  int i;

  for (i = 0; i < 2; i++)
    g[i]()();
}

/* Test */

int main()
{
  test_a();
  test_b();
  
  /* TL;DR: You can be an asshole of a programmer, but you should not be... :) */
}