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(*
Copyright © 2011 MLstate

This file is part of OPA.

OPA is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License, version 3, as published by
the Free Software Foundation.

OPA is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
more details.

You should have received a copy of the GNU Affero General Public License
along with OPA. If not, see <http://www.gnu.org/licenses/>.
*)
module Make (Keys: OrderedTypeSig.S)(Values: OrderedTypeSig.S) :
  (SetMapSig.S with type key = Keys.t and type elt = Values.t) =
struct
  type key = Keys.t
  type elt = Values.t

  module M = BaseMap.Make(Keys)
  module S = BaseSet.Make(Values)

  type t = S.t M.t

  let empty = M.empty
  let find_opt = M.find_opt

  let find k m =
    match find_opt k m with
    | Some s -> s
    | None -> S.empty

  let add (k:M.key) (v:S.elt) (m:S.t M.t) : S.t M.t =
    let (set:S.t) = find k m in
    M.add k (S.add v set) m

  let remove (k:M.key) (v:S.elt) (m:S.t M.t) : S.t M.t =
    let (set:S.t) = find k m in
    M.add k (S.remove v set) m

end
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