(**
 * Copyright (c) 2015, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the "hack" directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 *)

val memoized : ('a, 'b) Hashtbl.t -> 'a -> (unit -> 'b) -> 'b

val const : 'a -> ('b -> 'a)
