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(****************************************************************************)
(* the diy toolsuite *)
(* *)
(* Jade Alglave, University College London, UK. *)
(* Luc Maranget, INRIA Paris-Rocquencourt, France. *)
(* *)
(* Copyright 2020-present Institut National de Recherche en Informatique et *)
(* en Automatique and the authors. All rights reserved. *)
(* *)
(* This software is governed by the CeCILL-B license under French law and *)
(* abiding by the rules of distribution of free software. You can use, *)
(* modify and/ or redistribute the software under the terms of the CeCILL-B *)
(* license as circulated by CEA, CNRS and INRIA at the following URL *)
(* "http://www.cecill.info". We also give a copy in LICENSE.txt. *)
(****************************************************************************)
module S = struct
type t = string option
let equal s1 s2 = match s1,s2 with
| Some s1,Some s2 -> Misc.string_eq s1 s2
| None,None -> true
| (Some _,None)|(None,Some _)
-> false
let hash = function
| None -> 0
| Some s -> Hashtbl.hash s
end
module H = Hashcons.Make(S)
type t = string option Hashcons.hash_consed
let table = H.create 101
let as_hashed s = H.hashcons table s
let as_t h = h.Hashcons.node
let as_hash h = h.Hashcons.hkey
let compare s1 s2 = Misc.opt_compare String.compare (as_t s1) (as_t s2)
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