Add CArray.iteri

src/ctypes/ctypes.mli

@@ -293,6 +293,11 @@ sig
   (** [iter f a] is analogous to [Array.iter f a]: it applies [f] in turn to
       all the elements of [a]. *)
 
+  val iteri : (int -> 'a -> unit) -> 'a t -> unit
+  (** [iter f a] is analogous to [Array.iteri f a]: it applies [f] in turn to
+      all the elements of [a] but the function is applied to the index of the 
+      element as first argument, and the element itself as second argument *)
+
   val map : 'b typ -> ('a -> 'b) -> 'a t -> 'b t
   (** [map t f a] is analogous to [Array.map f a]: it creates a new array with
       element type [t] whose elements are obtained by applying [f] to the

src/ctypes/ctypes_memory.ml

@@ -245,6 +245,11 @@ struct
       f (unsafe_get a i)
     done
 
+  let iteri f a =
+    for i = 0 to length a - 1 do
+      f i (unsafe_get a i)
+    done
+
   let map typ f a =
     let l = length a in
     let r = make typ l in

tests/test-arrays/test_array.ml

@@ -106,6 +106,21 @@ let test_iter _ =
   assert_equal !r 0
 
 
+(*
+  Test the CArray.iteri function
+ *)
+ let test_iteri _ =
+  let r = ref 0 in
+  let a = CArray.of_list int [1; 2; 3] in
+  let () = CArray.iteri (fun i v -> r := !r + i + v) a in
+  assert_equal !r 9;
+
+  let r = ref 0 in
+  let a = CArray.of_list int [] in
+  let () = CArray.iteri (fun _ -> assert false) a in
+  assert_equal !r 0
+
+
 (*
   Test the CArray.map function
  *)
@@ -370,6 +385,9 @@ let suite = "Array tests" >:::
    "CArray.iter "
     >:: test_iter;
 
+    "CArray.iteri "
+    >:: test_iteri;
+
    "CArray.map "
     >:: test_map;