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
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
{-# LANGUAGE TypeSynonymInstances, FlexibleInstances #-}
module Database.TokyoCabinet.FDB.Key (Key(..), ID(..)) where
import Database.TokyoCabinet.FDB.C (ID(..), unID)
import Data.Int
import Data.Word
class Key a where
toID :: a -> ID
fromID :: ID -> a
instance Key Int where
toID = ID . fromIntegral
fromID = fromIntegral . unID
instance Key Int8 where
toID = ID . fromIntegral
fromID = fromIntegral . unID
instance Key Int16 where
toID = ID . fromIntegral
fromID = fromIntegral . unID
instance Key Int32 where
toID = ID . fromIntegral
fromID = fromIntegral . unID
instance Key Int64 where
toID = ID
fromID = fromIntegral . unID
instance Key Word8 where
toID = ID . fromIntegral
fromID = fromIntegral . unID
instance Key Word16 where
toID = ID . fromIntegral
fromID = fromIntegral . unID
instance Key Word32 where
toID = ID . fromIntegral
fromID = fromIntegral . unID
instance Key Word64 where
toID = ID . fromIntegral
fromID = fromIntegral . unID
instance Key ID where
toID = id
fromID = id
instance Key String where
toID "min" = IDMIN
toID "max" = IDMAX
toID "prev" = IDPREV
toID "next" = IDNEXT
toID idstr = ID (read idstr)
fromID = show . unID
|
