Revision of properties.ml

1 file changed, 42 insertions

properties.ml(fájl létrehozva)

		@@ -0,0 +1,42 @@
1	+	module Univ = struct
2	+	type t = ..
3	+	let id =
4	+	let id = ref 0 in
5	+	fun () ->
6	+	incr id ;
7	+	!id
8	+
9	+	module Embed (M : sig type t end) = struct
10	+	type t += E of M.t
11	+	let wrap m = E m
12	+	let read = function E m -> Some m \| _ -> None
13	+
14	+	let new_property () =
15	+	let id = id () in
16	+	let set t v =
17	+	Hashtbl.replace t id @@ wrap v in
18	+	let get t =
19	+	Hashtbl.find_opt t id \|> Fun.flip Option.bind read in
20	+	(set, get)
21	+	end
22	+	end
23	+
24	+	module IntWrapper = Univ.Embed(Int)
25	+	module StringWrapper = Univ.Embed(String)
26	+
27	+	let and_null = Hashtbl.create 16
28	+	let or_watt = Hashtbl.create 16
29	+
30	+	let name = StringWrapper.new_property ()
31	+	let age = IntWrapper.new_property ()
32	+	let money = IntWrapper.new_property ()
33	+
34	+	let get t (set, get) = get t
35	+	let set t (set, get) x = set t x
36	+
37	+	let () = set and_null name "and Null"
38	+	let () = set and_null age 28
39	+	let () = set and_null money 20
40	+	let () = set or_watt name "or Watt"
41	+	let () = set or_watt age 28
42	+	let () = set or_watt money 100

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