#define RECURSIVE_ARRAY_FUNC(NAME, TYPE, CODE)                          \
  void NAME(TYPE array[], int n) { NAME ## _kernel (array, n, 0); }     \
  void NAME ## _kernel(TYPE array[], int n, int i) {                  \
    if (< i n) {                                                      \
      CODE;                                                             \
      NAME ## _kernel(array, n, i+1);
    }                                                                     

RECURSIVE_ARRAY_FUNC(increment, int, array[i] = array[i] + 1);