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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) *)
(************************************************************************)
Require Import Ltac2.Init.
Require Import Ltac2.Int.
(** Type of a reference cell, similar to OCaml's ['a ref] type. *)
Ltac2 Type 'a ref := 'a Init.ref.
Ltac2 ref (v : 'a) : 'a ref := { contents := v}.
Ltac2 get (r : 'a ref) : 'a := r.(contents).
Ltac2 set (r : 'a ref) (v : 'a) : unit := r.(contents) := v.
Ltac2 incr (r : int ref) : unit := r.(contents) := add (r.(contents)) 1.
Ltac2 decr (r : int ref) : unit := r.(contents) := sub (r.(contents)) 1.
Ltac2 update (r : 'a ref) (f : 'a -> 'a) : unit :=
r.(contents) := f (r.(contents)).
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