1  struct data {
       2      int prio;
       3      signed char status;
       4  };
       5  
       6  struct base {
       7      unsigned _num;
       8      struct data vec[10];
       9  };
      10  
      11  static struct data *ix(struct base *base, unsigned i)
      12  {
      13      return &base->vec[i];
      14  }
      15  
      16  struct heap {
      17      struct base base;
      18  };
      19  
      20  struct heap *heap;
      21  
      22  void increase_insn_priority (int *fld, int amount)
      23  {
      24      if (ix(heap ? &heap->base : 0, *fld)->status > 0)
      25  	ix(heap ? &heap->base : 0, *fld)->prio += amount;
      26  }