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|
(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \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) *)
(************************************************************************)
(*** This module implements an "untyped store", in this particular case we
see it as an extensible record whose fields are left unspecified. ***)
module type S =
sig
type t
(** Type of stores *)
type 'a field
(** Type of field of such stores *)
val empty : t
(** Empty store *)
val set : t -> 'a field -> 'a -> t
(** Set a field *)
val get : t -> 'a field -> 'a option
(** Get the value of a field, if any *)
val remove : t -> 'a field -> t
(** Unset the value of the field *)
val merge : t -> t -> t
(** [merge s1 s2] adds all the fields of [s1] into [s2]. *)
val field : unit -> 'a field
(** Create a new field *)
end
module Make () : S
(** Create a new store type. *)
|
