X-Git-Url: https://git.xandkar.net/?a=blobdiff_plain;f=polymorphic-life%2F001%2Fsrc%2Fpolymorphic_life.ml;h=9a9163e1c1be2f6cb0a0132730fc075f71b19c89;hb=0d6f78335b05b14736c63234d7f15a9cf2420b1a;hp=a667bc4b4a23c875d15965f52b41d11850d8e60a;hpb=4d49c95e96b6a688ecbc54bea64b810c9611b400;p=cellular-automata.git

diff --git a/polymorphic-life/001/src/polymorphic_life.ml b/polymorphic-life/001/src/polymorphic_life.ml
index a667bc4..9a9163e 100644
--- a/polymorphic-life/001/src/polymorphic_life.ml
+++ b/polymorphic-life/001/src/polymorphic_life.ml
@@ -47,6 +47,33 @@ module Matrix : MATRIX = struct
 end
 
 
+module type CELL = sig
+  type t
+
+  val state : t -> int
+
+  val react : t -> states:int list -> t
+end
+
+
+module Conway : CELL = struct
+  type t = D | A
+
+  let state = function
+    | D -> 0
+    | A -> 1
+
+  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
+    | t -> t
+end
+
+
 let main () =
   let pool = Matrix.create ~rows:5 ~cols:5 ~data:() in
   Matrix.iter pool ~f:(