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tag: RELEASE-0.13
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open Common
open Ocollection
class virtual ['a] oset =
object(o: 'o)
inherit ['a] ocollection
(* no need virtual, but better to redefine (efficiency) *)
method virtual union: 'o -> 'o
method virtual inter: 'o -> 'o
method virtual minus: 'o -> 'o
(* allow binary methods tricks, generate exception when not good type *)
method tosetb: 'a Set_poly.t = raise Impossible
method tosetpt: SetPt.t = raise Impossible
method toseti: Seti.seti = raise Impossible
method virtual toset: 'b. 'b (* generic (not safe) tricks *)
(* is_intersect, equal, subset *)
method is_subset_of: 'o -> bool = fun o2 ->
((o2#minus o)#cardinal >= 0) && ((o#minus o2)#cardinal =|= 0)
method is_equal: 'o -> bool = fun o2 ->
((o2#minus o)#cardinal =|= 0) && ((o#minus o2)#cardinal =|= 0)
method is_singleton: bool = (* can be short circuited *)
o#length =|= 1
method cardinal: int = (* just to keep naming conventions *)
o#length
(* dont work:
method big_union: 'b. ('a -> 'b oset) -> 'b oset = fun f -> todo()
*)
end
let ($??$) e xs = xs#mem e
let ($++$) xs ys = xs#union ys
let ($**$) xs ys = xs#inter ys
let ($--$) xs ys = xs#minus ys
let ($<<=$) xs ys = xs#is_subset_of ys
let ($==$) xs ys = xs#is_equal ys
(* todo: pas beau le seed. I dont put the type otherwise have to
* put explicit :>
*)
let (mapo: ('a -> 'b) -> 'b oset -> 'a oset -> 'b oset) = fun f seed xs ->
xs#fold (fun acc x -> acc#add (f x)) seed
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