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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
module type OrderedType =
sig
type t
val compare : t -> t -> int
end
module type S = Map.S
module type ExtS =
sig
include Map.S
module Set : Set.S with type elt = key
val domain : 'a t -> Set.t
end
module Domain (M : Map.OrderedType) :
sig
val domain : 'a Map.Make(M).t -> Set.Make(M).t
end =
struct
(** This unsafe module is a way to access to the actual implementations of
OCaml sets and maps without reimplementing them ourselves. It is quite
dubious that these implementations will ever be changed... Nonetheless,
if this happens, we can still implement a less clever version of [domain].
*)
type 'a map = 'a Map.Make(M).t
type set = Set.Make(M).t
type 'a _map =
| MEmpty
| MNode of 'a map * M.t * 'a * 'a map * int
type _set =
| SEmpty
| SNode of set * M.t * set * int
let rec domain (s : 'a map) : set = match Obj.magic s with
| MEmpty -> Obj.magic SEmpty
| MNode (l, k, _, r, h) ->
Obj.magic (SNode (domain l, k, domain r, h))
(** This function is essentially identity, but OCaml current stdlib does not
take advantage of the similarity of the two structures, so we introduce
this unsafe loophole. *)
end
module Make(M : Map.OrderedType) =
struct
include Map.Make(M)
include Domain(M)
end
|
