| Safe Haskell | Safe |
|---|---|
| Language | Haskell2010 |
Data.ZigZag
Description
ZigZag encoding of signed integrals.
Documentation
class (Integral signed, Integral unsigned) => ZigZag signed unsigned | unsigned -> signed, signed -> unsigned where Source #
Convert between a signed integral and the corresponding ZigZag encoded unsigned integral (e.g. between Int8 and Word8 or Integral and Natural).
Invalid conversions produce a type error:
zigZag (-1::Int64) :: Word32 ... ... Couldn't match type ... ...
>>>zigZag (0::Int8)0
>>>zigZag (-1::Int16)1
>>>zigZag (1::Int32)2
>>>zigZag (-2::Int16)3
>>>zigZag (-50::Integer)99
>>>zigZag (50::Integer)100
>>>zigZag (64::Integer)128
>>>zigZag (-256::Integer)511
>>>zigZag (256::Integer)512
>>>map zigZag [-3..3::Integer][5,3,1,0,2,4,6]
>>>map zagZig [0..6::Word8][0,-1,1,-2,2,-3,3]
\(f::Integer) -> zagZig (zigZag f) == f
\(f::Natural) -> zigZag (zagZig f) == f
\(f::Int8) -> zagZig (zigZag f) == f
\(f::Word8) -> zigZag (zagZig f) == f
\(s::Int8) -> zigZag s == fromIntegral (zigZag (fromIntegral s :: Integer))
\(u::Word8) -> zagZig u == fromIntegral (zagZig (fromIntegral u :: Natural))
\(f::Int64) -> zagZig (zigZag f) == f
\(f::Word64) -> zigZag (zagZig f) == f
\(s::Int64) -> zigZag s == fromIntegral (zigZag (fromIntegral s :: Integer))
\(u::Word64) -> zagZig u == fromIntegral (zagZig (fromIntegral u :: Natural))
Minimal complete definition
Nothing
Methods
zigZag :: signed -> unsigned Source #
zigZag :: FiniteBits signed => signed -> unsigned Source #