blob: aa36b788aa6918df4e6f8aa379203ef8d66c6d1e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
-- | An tiny wrapper around 'IntSet.IntSet' for representing sets of 'Enum'
-- things.
module EnumSet
( EnumSet
, member
, insert
, delete
, toList
, fromList
, empty
) where
import qualified Data.IntSet as IntSet
newtype EnumSet a = EnumSet IntSet.IntSet
member :: Enum a => a -> EnumSet a -> Bool
member x (EnumSet s) = IntSet.member (fromEnum x) s
insert :: Enum a => a -> EnumSet a -> EnumSet a
insert x (EnumSet s) = EnumSet $ IntSet.insert (fromEnum x) s
delete :: Enum a => a -> EnumSet a -> EnumSet a
delete x (EnumSet s) = EnumSet $ IntSet.delete (fromEnum x) s
toList :: Enum a => EnumSet a -> [a]
toList (EnumSet s) = map toEnum $ IntSet.toList s
fromList :: Enum a => [a] -> EnumSet a
fromList = EnumSet . IntSet.fromList . map fromEnum
empty :: EnumSet a
empty = EnumSet IntSet.empty
|
