Source file var.ml

(******************************************************************************)
(*                                                                            *)
(*     Alt-Ergo: The SMT Solver For Software Verification                     *)
(*     Copyright (C) 2013-2018 --- OCamlPro SAS                               *)
(*                                                                            *)
(*     This file is distributed under the terms of the license indicated      *)
(*     in the file 'License.OCamlPro'. If 'License.OCamlPro' is not           *)
(*     present, please contact us to clarify licensing.                       *)
(*                                                                            *)
(******************************************************************************)

open Options
open Format

type view = {
  hs : Hstring.t ;
  id : int ;
}

type t = view

let cpt = ref 0

let of_hstring hs =
  incr cpt;
  {hs ; id = !cpt}

let of_string s =
  incr cpt;
  {hs = Hstring.make s; id = !cpt}

let view v = v

let compare a b =
  let c = a.id - b.id in
  if c <> 0 then c
  else begin
    assert (Hstring.equal a.hs b.hs);
    c
  end

let equal a b = compare a b = 0

let hash { id; _ } = id

let to_string {hs ; id} =
  sprintf "%s~%d" (Hstring.view hs) id

let print fmt v =
  fprintf fmt "%s" (to_string v)

module Set = Set.Make(struct type t = view let compare = compare end)
module Map = Map.Make(struct type t = view let compare = compare end)