--- | Convert each bit to its integer value, and multiply by the
--- appropriate power of two. Sum them up, and we should get an integer
--- between 0 and 255.
-octet_to_int :: Octet -> Int
-octet_to_int x =
- 128 * (bit_to_int (b1 x)) +
- 64 * (bit_to_int (b2 x)) +
- 32 * (bit_to_int (b3 x)) +
- 16 * (bit_to_int (b4 x)) +
- 8 * (bit_to_int (b5 x)) +
- 4 * (bit_to_int (b6 x)) +
- 2 * (bit_to_int (b7 x)) +
- 1 * (bit_to_int (b8 x))
+instance Ord Octet where
+ (Octet x1 x2 x3 x4 x5 x6 x7 x8) <= (Octet y1 y2 y3 y4 y5 y6 y7 y8)
+ | x1 > y1 = False
+ | x2 > y2 = False
+ | x3 > y3 = False
+ | x4 > y4 = False
+ | x5 > y5 = False
+ | x6 > y6 = False
+ | x7 > y7 = False
+ | x8 > y8 = False
+ | otherwise = True
+
+
+instance Bounded Octet where
+ -- | The octet with the least possible value.
+ minBound =
+ Octet B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero
+
+ -- | The octet with the greatest possible value.
+ maxBound =
+ Octet B.One B.One B.One B.One B.One B.One B.One B.One
+
+
+instance Enum Octet where
+ -- We're supposed to throw a runtime error if you call (succ
+ -- maxBound), so the fromJust here doesn't introduce any additional
+ -- badness.
+ toEnum = fromJust . octet_from_int
+
+ -- | Convert each bit to its integer value, and multiply by the
+ -- appropriate power of two. Sum them up, and we should get an integer
+ -- between 0 and 255.
+ fromEnum x =
+ 128 * (bit_to_int (b1 x)) +
+ 64 * (bit_to_int (b2 x)) +
+ 32 * (bit_to_int (b3 x)) +
+ 16 * (bit_to_int (b4 x)) +
+ 8 * (bit_to_int (b5 x)) +
+ 4 * (bit_to_int (b6 x)) +
+ 2 * (bit_to_int (b7 x)) +
+ 1 * (bit_to_int (b8 x))