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open Basetypes
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type ('a, 'b) t = Memo : ('a, 'b) Hashtbl.t -> ('a, 'b) t;;
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let create () = Memo (Hashtbl.create 97);;
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let reset (Memo hashf) =
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  begin
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    Hashtbl.reset hashf
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  end
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let fold (Memo hashf) f e =
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  begin
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    Hashtbl.fold f hashf e
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  end;;
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let apply (Memo hashf) f =
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  fun x ->
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    try
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      Log.report ~level:sf_level (fun fmt -> Format.fprintf fmt "lookup 1@.");
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      Hashtbl.find hashf x
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    with Not_found ->
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      let res = f x in
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      begin
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	Log.report ~level:sf_level (fun fmt -> Format.fprintf fmt "hashing 1@.");
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	Hashtbl.add hashf x res;
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	res
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      end;;
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let apply2 (Memo hashf) f =
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  fun x y ->
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    try
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      Log.report ~level:sf_level (fun fmt -> Format.fprintf fmt "lookup 2@.");
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      Hashtbl.find hashf (x, y)
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    with Not_found ->
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      let res = f x y in
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      begin
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	Log.report ~level:sf_level (fun fmt -> Format.fprintf fmt "hashing 2@.");
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	Hashtbl.add hashf (x, y) res;
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	res
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      end;;
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let apply3 (Memo hashf) f =
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  fun x y z ->
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    try
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      Log.report ~level:sf_level (fun fmt -> Format.fprintf fmt "lookup 3@.");
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      Hashtbl.find hashf (x, y, z)
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    with Not_found ->
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      let res = f x y z in
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      begin
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	Log.report ~level:sf_level (fun fmt -> Format.fprintf fmt "hashing 3@.");
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	Hashtbl.add hashf (x, y, z) res;
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	res
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      end;;