It is quite reasonably easy enough compared to any real practical programming task. For example:

  // your ordinary function declarations
  int plus2(int i) { return i + 2; }
  int times2(int i) { return i * 2; }

  typedef int (*modfun)(int);
  // a very reasonable syntax altogether
  modfun get_modfun(bool mul) { return (mul ? times2 : plus2); }

Nests as well if you ever wanted to:

  modfun get_modfun_no_mul(bool mul) { return plus2; }

  typedef modfun (*modfun_getter)(bool);
  modfun_getter get_getter(bool allow_mul_opt) { return (allow_mul_opt ? get_modfun : get_modfun_no_mul); }