From: Siraaj Khandkar <siraaj@khandkar.net>
Date: Wed, 25 Sep 2013 21:29:39 +0000 (-0400)
Subject: Implement Conway's Life cell.
X-Git-Url: https://git.xandkar.net/?a=commitdiff_plain;ds=sidebyside;h=0d6f78335b05b14736c63234d7f15a9cf2420b1a;hp=da8f1674316dfc43fb0eb87e5f9d09b2cc942374;p=cellular-automata.git

Implement Conway's Life cell.
---

diff --git a/polymorphic-life/001/src/polymorphic_life.ml b/polymorphic-life/001/src/polymorphic_life.ml
index ca6d819..9a9163e 100644
--- a/polymorphic-life/001/src/polymorphic_life.ml
+++ b/polymorphic-life/001/src/polymorphic_life.ml
@@ -56,6 +56,24 @@ module type CELL = sig
 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:(