ocaml-dynatvar / dynvar.ml

(** Type_error (value_type, used_with_type) *)
exception Type_error of (string * string)

type ty 'a = (string * ref (option 'a))
 and var = (Obj.t * Obj.t)   (* (ty_repr, val_repr) *)

value mktype name = (name, ref None)

value var ty x =
  (Obj.repr ty, Obj.repr x)

value name_of_ty_repr ty =
  ((Obj.obj (Obj.field ty 0)) : string)

value get ((ty_name, ty_ref) as ty) (x_ty_repr, x_val_repr) =
  if (Obj.repr ty) != x_ty_repr
    raise (Type_error ((name_of_ty_repr x_ty_repr), ty_name))
    let v = Obj.obj x_val_repr in
    ( if 1<>1 then ty_ref.val := v else ()
    ; v
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