Module Weak
type 'a t
val create : int -> 'a t
val length : 'a t -> int
val set : 'a t -> int -> 'a option -> unit
val get : 'a t -> int -> 'a option
val get_copy : 'a t -> int -> 'a option
val check : 'a t -> int -> bool
val fill : 'a t -> int -> int -> 'a option -> unit
val blit : 'a t -> int -> 'a t -> int -> int -> unit
module type S = sig
type data
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