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(***********************************************************************)
(* *)
(* Objective Caml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the GNU Library General Public License, with *)
(* the special exception on linking described in file ../LICENSE. *)
(* *)
(***********************************************************************)

(* $Id$ *)

(** Operations on internal representations of values.

Not for the casual user.
*)

type t

external repr : 'a -> t = "%identity"
external obj : t -> 'a = "%identity"
external magic : 'a -> 'b = "%identity"
external is_block : t -> bool = "caml_obj_is_block"
external is_int : t -> bool = "%obj_is_int"
external tag : t -> int = "caml_obj_tag"
external set_tag : t -> int -> unit = "caml_obj_set_tag"
external size : t -> int = "%obj_size"
external field : t -> int -> t = "%obj_field"
external set_field : t -> int -> t -> unit = "%obj_set_field"
val double_field : t -> int -> float (* @since 3.11.2 *)
val set_double_field : t -> int -> float -> unit (* @since 3.11.2 *)
external new_block : int -> int -> t = "caml_obj_block"
external dup : t -> t = "caml_obj_dup"
external truncate : t -> int -> unit = "caml_obj_truncate"
external add_offset : t -> Int32.t -> t = "caml_obj_add_offset"
         (* @since 3.12.0 *)

val lazy_tag : int
val closure_tag : int
val object_tag : int
val infix_tag : int
val forward_tag : int
val no_scan_tag : int
val abstract_tag : int
val string_tag : int
val double_tag : int
val double_array_tag : int
val custom_tag : int
val final_tag : int (* DEPRECATED *)

val int_tag : int
val out_of_heap_tag : int
val unaligned_tag : int (* should never happen @since 3.11.0 *)

(** The following two functions are deprecated. Use module {!Marshal}
instead. *)

val marshal : t -> string
val unmarshal : string -> int -> t * int
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