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(** {1 Hash Table with Heterogeneous Keys} *)
type 'b injection = {
get: (unit -> unit) -> 'b option;
set: 'b -> unit -> unit;
}
type 'a t = ('a, unit -> unit) Hashtbl.t
let create n = Hashtbl.create n
let create_inj () =
let r = ref None in
let get f =
r := None;
f ();
!r
and set v () = r := Some v in
{ get; set }
let get ~inj tbl x = try inj.get (Hashtbl.find tbl x) with Not_found -> None
let set ~inj tbl x y = Hashtbl.replace tbl x (inj.set y)
let length tbl = Hashtbl.length tbl
let clear tbl = Hashtbl.clear tbl
let remove tbl x = Hashtbl.remove tbl x
let copy tbl = Hashtbl.copy tbl
let is_some = function
| None -> false
| Some _ -> true
let mem ~inj tbl x =
try is_some (inj.get (Hashtbl.find tbl x)) with Not_found -> false
let find ~inj tbl x =
match inj.get (Hashtbl.find tbl x) with
| None -> raise Not_found
| Some v -> v
let iter_keys tbl f = Hashtbl.iter (fun x _ -> f x) tbl
let fold_keys tbl acc f = Hashtbl.fold (fun x _ acc -> f acc x) tbl acc
(** {2 Iterators} *)
type 'a iter = ('a -> unit) -> unit
let keys_iter tbl yield = Hashtbl.iter (fun x _ -> yield x) tbl
let bindings_of ~inj tbl yield =
Hashtbl.iter
(fun k value ->
match inj.get value with
| None -> ()
| Some v -> yield (k, v))
tbl
type value = Value : ('b injection -> 'b option) -> value
let bindings tbl yield =
Hashtbl.iter (fun x y -> yield (x, Value (fun inj -> inj.get y))) tbl