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module type KEY = sig
type 'a t
val comp: 'a t -> 'b t -> ('a, 'b) Tools.cmp
val repr: Format.formatter -> 'a t -> unit
end
module Make (El : KEY) : sig
type t
(** Create an empty tree *)
val empty: t
(** Return the element in the tree with the given key *)
val find: 'a El.t -> t -> 'a
(** Add one element in the tree, if the element is already present, it is replaced. *)
val add: 'a El.t -> 'a -> t -> t
(** Check if the key exists *)
val member: 'a El.t -> t -> bool
val remove: 'a El.t -> t -> t
(** This type is used in the fold function as existencial type *)
type container = C : ('a El.t * 'a) -> container [@@unboxed]
val fold: ('a -> container -> 'a) -> 'a -> t -> 'a
(** Represent the content in dot syntax *)
val repr: Format.formatter -> t -> unit
end
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