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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
{- |
Module : Data.MaybeLike.Instances
Copyright : (c) Eduard Sergeev 2013
License : BSD-style (see the file LICENSE)
Maintainer : eduard.sergeev@gmail.com
Stability : experimental
Portability : non-portable (multi-param classes, functional dependencies)
Defines default instances of `MaybeLike` for most primitive "Unboxed" types
-}
{-# LANGUAGE NoImplicitPrelude, MultiParamTypeClasses,
FlexibleContexts, FlexibleInstances #-}
module Data.MaybeLike.Instances
(
module Data.MaybeLike
) where
import Data.Eq ((==))
import Prelude (Bounded(maxBound), (/), isNaN)
import Prelude (Float, Double)
import Data.Char
import Data.Int
import Data.Word
import qualified Data.Maybe as M
import Data.MaybeLike
instance MaybeLike (M.Maybe a) a where
{-# INLINE nothing #-}
nothing = M.Nothing
{-# INLINE isNothing #-}
isNothing = M.isNothing
{-# INLINE just #-}
just = M.Just
{-# INLINE fromJust #-}
fromJust = M.fromJust
instance MaybeLike Char Char where
{-# INLINE nothing #-}
nothing = maxBound
{-# INLINE isNothing #-}
isNothing v = v == maxBound
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
instance MaybeLike Int Int where
{-# INLINE nothing #-}
nothing = maxBound
{-# INLINE isNothing #-}
isNothing v = v == maxBound
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
instance MaybeLike Int8 Int8 where
{-# INLINE nothing #-}
nothing = maxBound
{-# INLINE isNothing #-}
isNothing v = v == maxBound
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
instance MaybeLike Int16 Int16 where
{-# INLINE nothing #-}
nothing = maxBound
{-# INLINE isNothing #-}
isNothing v = v == maxBound
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
instance MaybeLike Int32 Int32 where
{-# INLINE nothing #-}
nothing = maxBound
{-# INLINE isNothing #-}
isNothing v = v == maxBound
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
instance MaybeLike Int64 Int64 where
{-# INLINE nothing #-}
nothing = maxBound
{-# INLINE isNothing #-}
isNothing v = v == maxBound
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
instance MaybeLike Word Word where
{-# INLINE nothing #-}
nothing = maxBound
{-# INLINE isNothing #-}
isNothing v = v == maxBound
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
instance MaybeLike Word8 Word8 where
{-# INLINE nothing #-}
nothing = maxBound
{-# INLINE isNothing #-}
isNothing v = v == maxBound
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
instance MaybeLike Word16 Word16 where
{-# INLINE nothing #-}
nothing = maxBound
{-# INLINE isNothing #-}
isNothing v = v == maxBound
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
instance MaybeLike Word32 Word32 where
{-# INLINE nothing #-}
nothing = maxBound
{-# INLINE isNothing #-}
isNothing v = v == maxBound
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
instance MaybeLike Word64 Word64 where
{-# INLINE nothing #-}
nothing = maxBound
{-# INLINE isNothing #-}
isNothing v = v == maxBound
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
instance MaybeLike Float Float where
{-# INLINE nothing #-}
nothing = 0/0
{-# INLINE isNothing #-}
isNothing = isNaN
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
instance MaybeLike Double Double where
{-# INLINE nothing #-}
nothing = 0/0
{-# INLINE isNothing #-}
isNothing = isNaN
{-# INLINE just #-}
just v = v
{-# INLINE fromJust #-}
fromJust v = v
|
