code.delx.au - gnu-emacs/blob - test/manual/etags/cp-src/conway.hpp

   1 /* ======================================================================= */
   2 /*                                 CONWAY.H                                */
   3 /* ======================================================================= */
   4
   5 class site: public location
   6     {
   7     char x, y, alive, next_alive;
   8     int total_surrounding(void);
   9 public:
  10     site(int xi, int yi): x(xi), y(yi), alive(0) { }
  11     ~site();
  12     char read() { return alive; }
  13     void set(void) { alive = 1; }
  14     void clear(void) { alive = 0; }
  15     void compute_next_state(void)
  16         {
  17         int n = total_surrounding();
  18         next_alive = alive;
  19         if (n < 2 || n > 3) next_alive = 0;
  20         else if (n > 2) next_alive = 1;
  21         }
  22     void step(void) { alive = next_alive; }
  23     };