`sig type 'a t val create : int -> 'a Weak.t val length : 'a Weak.t -> int val set : 'a Weak.t -> int -> 'a option -> unit val get : 'a Weak.t -> int -> 'a option val get_copy : 'a Weak.t -> int -> 'a option val check : 'a Weak.t -> int -> bool val fill : 'a Weak.t -> int -> int -> 'a option -> unit val blit : 'a Weak.t -> int -> 'a Weak.t -> int -> int -> unit module type S = sig type data type t val create : int -> Weak.S.t val clear : Weak.S.t -> unit val merge : Weak.S.t -> Weak.S.data -> Weak.S.data val add : Weak.S.t -> Weak.S.data -> unit val remove : Weak.S.t -> Weak.S.data -> unit val find : Weak.S.t -> Weak.S.data -> Weak.S.data val find_all : Weak.S.t -> Weak.S.data -> Weak.S.data list val mem : Weak.S.t -> Weak.S.data -> bool val iter : (Weak.S.data -> unit) -> Weak.S.t -> unit val fold : (Weak.S.data -> 'a -> 'a) -> Weak.S.t -> 'a -> 'a val count : Weak.S.t -> int val stats : Weak.S.t -> int * int * int * int * int * int end module Make : functor (H : Hashtbl.HashedType) -> sig type data = H.t type t val create : int -> t val clear : t -> unit val merge : t -> data -> data val add : t -> data -> unit val remove : t -> data -> unit val find : t -> data -> data val find_all : t -> data -> data list val mem : t -> data -> bool val iter : (data -> unit) -> t -> unit val fold : (data -> 'a -> 'a) -> t -> 'a -> 'a val count : t -> int val stats : t -> int * int * int * int * int * int end end`