Implement a generic matrix abstraction.

diff --git a/polymorphic-life/001/src/polymorphic_life.ml b/polymorphic-life/001/src/polymorphic_life.ml
index e3c233d..a667bc4 100644 (file)
--- a/polymorphic-life/001/src/polymorphic_life.ml
+++ b/polymorphic-life/001/src/polymorphic_life.ml
@@ -1,8 +1,57 @@
 open Core.Std
 
 
+module type MATRIX = sig
+  type 'a t
+
+  val create : rows:int -> cols:int -> data:'a -> 'a t
+
+  val get : 'a t -> row:int -> col:int -> 'a
+
+  val set : 'a t -> row:int -> col:int -> data:'a -> unit
+
+  val map : 'a t -> f:(row:int -> col:int -> data:'a -> 'b) -> 'b t
+
+  val iter : 'a t -> f:(row:int -> col:int -> data:'a -> unit) -> unit
+end
+
+module Matrix : MATRIX = struct
+  type 'a t = 'a array array
+
+  let create ~rows ~cols ~data =
+    Array.make_matrix ~dimx:rows ~dimy:cols data
+
+  let iter t ~f =
+    Array.iteri t ~f:(
+      fun row cols ->
+        Array.iteri cols ~f:(
+          fun col data ->
+            f ~row ~col ~data
+        )
+    )
+
+  let map t ~f =
+    Array.mapi t ~f:(
+      fun row cols ->
+        Array.mapi cols ~f:(
+          fun col data ->
+            f ~row ~col ~data
+        )
+    )
+
+  let get t ~row ~col =
+    t.(row).(col)
+
+  let set t ~row ~col ~data =
+    t.(row).(col) <- data
+end
+
+
 let main () =
-  printf "Hi!\n"
+  let pool = Matrix.create ~rows:5 ~cols:5 ~data:() in
+  Matrix.iter pool ~f:(
+    fun ~row ~col ~data:() -> printf "R: %d, K: %d\n" row col
+  )
 
 
 let () = main ()