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(***********************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team    *)
(* <O___,, *        INRIA-Rocquencourt  &  LRI-CNRS-Orsay              *)
(*   \VV/  *************************************************************)
(*    //   *      This file is distributed under the terms of the      *)
(*         *       GNU Lesser General Public License Version 2.1       *)
(***********************************************************************)

(* $Id$ *)

open Util

type ('a,'b) t = ('a,'b list) Gmap.t

let empty = Gmap.empty
let mem = Gmap.mem
let iter = Gmap.iter
let map = Gmap.map
let fold = Gmap.fold

let add x y m =
  try
    let l = Gmap.find x m in
    Gmap.add x (if List.mem y l then l else y::l) m
  with Not_found ->
    Gmap.add x [y] m

let find x m =
  try Gmap.find x m with Not_found -> []

let remove x y m =
  let l = Gmap.find x m in
  Gmap.add x (if List.mem y l then list_subtract l [y] else l) m