some conversion functions that use Sequence.t2

sequence.ml

@@ -362,6 +362,10 @@ let of_array_i a =
     for i = 0 to Array.length a - 1 do k (i, a.(i)) done
   in from_iter seq
 
+let of_array2 a =
+  fun k ->
+    for i = 0 to Array.length a - 1 do k i a.(i) done
+
 (** [array_slice a i j] Sequence of elements whose indexes range
     from [i] to [j] *)
 let array_slice a i j =
@@ -410,9 +414,17 @@ let to_hashtbl seq =
   hashtbl_replace h seq;
   h
 
+let to_hashtbl2 seq2 =
+  let h = Hashtbl.create 3 in
+  seq2 (fun k v -> Hashtbl.replace h k v);
+  h
+
 let of_hashtbl h =
   from_iter (fun k -> Hashtbl.iter (fun a b -> k (a, b)) h)
 
+let of_hashtbl2 h =
+  fun k -> Hashtbl.iter k h
+
 let hashtbl_keys h =
   from_iter (fun k -> Hashtbl.iter (fun a b -> k a) h)
 

sequence.mli

@@ -183,6 +183,8 @@ val of_array : 'a array -> 'a t
 val of_array_i : 'a array -> (int * 'a) t
   (** Elements of the array, with their index *)
 
+val of_array2 : 'a array -> (int, 'a) t2
+
 val array_slice : 'a array -> int -> int -> 'a t
   (** [array_slice a i j] Sequence of elements whose indexes range
       from [i] to [j] *)
@@ -216,9 +218,15 @@ val hashtbl_replace : ('a, 'b) Hashtbl.t -> ('a * 'b) t -> unit
 val to_hashtbl : ('a * 'b) t -> ('a, 'b) Hashtbl.t
   (** Build a hashtable from a sequence of key/value pairs *)
 
+val to_hashtbl2 : ('a, 'b) t2 -> ('a, 'b) Hashtbl.t
+  (** Build a hashtable from a sequence of key/value pairs *)
+
 val of_hashtbl : ('a, 'b) Hashtbl.t -> ('a * 'b) t
   (** Sequence of key/value pairs from the hashtable *)
 
+val of_hashtbl2 : ('a, 'b) Hashtbl.t -> ('a, 'b) t2
+  (** Sequence of key/value pairs from the hashtable *)
+
 val hashtbl_keys : ('a, 'b) Hashtbl.t -> 'a t
 val hashtbl_values : ('a, 'b) Hashtbl.t -> 'b t