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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * Copyright INRIA, CNRS and contributors *)
(* <O___,, * (see version control and CREDITS file for authors & dates) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
module type ValueS =
sig
type 'a t
end
(** Polymorphic maps over an extensible GADT tag type. *)
module type Tag = sig type _ tag = .. end
module Make (Tag:Tag) : sig
open Tag
module type OneTag = sig
type a
type _ tag += T : a tag
end
type 'a onetag = (module OneTag with type a = 'a)
(** There is no equality function between [_ tag] values (other than
[Stdlib.(=)]), and especially no equality function which shows
that when the values are equal the type arguments are also
equal.
Instead we can use ['a onetag] to recognize ['b tag] values. *)
val eq_onetag : 'a onetag -> 'b tag -> ('a,'b) CSig.eq option
val make : unit -> 'a onetag
val tag_of_onetag : 'a onetag -> 'a tag
module type MapS = sig
type t
type _ value
val empty : t
val find : 'a tag -> t -> 'a value
val add : 'a onetag -> 'a value -> t -> t
val mem : 'a tag -> t -> bool
val modify : 'a tag -> ('a value -> 'a value) -> t -> t
end
module Map(V:ValueS) : MapS with type 'a value := 'a V.t
end
|
