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Add FiniteBits instance #9

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Add FiniteBits instance #9

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10 changes: 7 additions & 3 deletions src/Data/BitVector.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -131,7 +131,6 @@ import Prelude
, flip, fromIntegral
, maxBound
, snd
, undefined
, ($), (.), (^), (++)
)

Expand Down Expand Up @@ -757,9 +756,9 @@ instance Bits BV where
testBit (BV n a) i | i < n = testBit a i
| otherwise = False
{-# INLINE testBit #-}
bitSize = undefined
bitSize = width
#if MIN_VERSION_base(4,7,0)
bitSizeMaybe = const Nothing
bitSizeMaybe = Just . width
#endif
isSigned = const False
shiftL (BV n a) k
Expand Down Expand Up @@ -791,6 +790,11 @@ instance Bits BV where
popCount (BV _ a) = assert (a >= 0) $ popCount a
{-# INLINE popCount #-}

#if MIN_VERSION_base(4,7,0)
instance FiniteBits BV where
finiteBitSize = width
#endif

-- | An alias for 'complement'.
not :: BV -> BV
not = complement
Expand Down