+module Conway : CELL = struct
+ type t = D | A
+
+ let of_int = function
+ | 0 -> D
+ | 1 -> A
+ | _ -> assert false
+
+ let to_int = function
+ | D -> 0
+ | A -> 1
+
+ let to_string = function
+ | D -> " "
+ | A -> "o"
+
+ let create () =
+ Random.int 2 |> of_int
+
+ let state = to_int
+
+ let react t ~states =
+ let live_neighbors = List.fold_left states ~init:0 ~f:(+) in
+ match t with
+ | A when live_neighbors < 2 -> D
+ | A when live_neighbors < 4 -> A
+ | A when live_neighbors > 3 -> D
+ | D when live_neighbors = 3 -> A
+ | A -> A
+ | D -> D
+end
+
+
+let rec loop bar grid =
+ print_endline bar;
+ Matrix.print grid ~to_string:Conway.to_string;
+ print_endline bar;
+ let grid =
+ Matrix.mapi grid ~f:(fun point ~data:cell ->
+ let neighbors = Matrix.get_neighbors grid point in
+ Conway.react cell ~states:(List.map neighbors ~f:Conway.state)
+ )
+ in
+ Unix.sleep 1;
+ loop bar grid
+
+