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(*  OCaml code from the book ``Learn Programming with OCaml''       *)
(*  See https://usr.lmf.cnrs.fr/lpo/                                *)
(*                                                                  *)
(*  Sylvain Conchon and Jean-Christophe Filliâtre                   *)
(*  Copyright 2025 Université Paris-Saclay and CNRS                 *)
(*                                                                  *)
(*  Openly licensed via CC BY SA 4.0                                *)
(*  See https://creativecommons.org/licenses/by-sa/4.0/deed.en      *)
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(* Program 48 on page 240
   Prefix Trees *)

module type PersistentSet = sig
  type elt
  type t
  val empty : t
  val add : elt -> t -> t
  val mem : elt -> t -> bool
  val remove : elt -> t -> t
  val inter : t -> t -> t
  val compare : t -> t -> int
end

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