Safe Haskell | None |
---|---|

Language | Haskell2010 |

- bitOp :: forall a. IvoryExpr a => ExpOp -> a -> a -> a
- class (Num a, IvoryExpr a) => IvoryBits a where
- class (IvoryBits a, IvoryBits b) => BitSplit a b | a -> b where
- class (IvoryBits a, IvoryBits b) => BitCast a b where
- class (IvoryBits unsigned, IvoryEq unsigned, IvoryExpr signed, Num signed, IvoryIntegral unsigned, Bounded unsigned, Bounded signed, IvoryOrd signed) => TwosComplementCast unsigned signed | signed -> unsigned, unsigned -> signed where
- extractByte :: BitCast a Uint8 => a -> (Uint8, a)

# Documentation

class (IvoryBits a, IvoryBits b) => BitSplit a b | a -> b where Source #

Extraction of the upper or lower half of a bit type into the next smallest bit type.

class (IvoryBits a, IvoryBits b) => BitCast a b where Source #

A narrowing cast from one bit type to another. This explicitly discards the upper bits of the input value to return a smaller type, and is only defined for unsigned integers.

class (IvoryBits unsigned, IvoryEq unsigned, IvoryExpr signed, Num signed, IvoryIntegral unsigned, Bounded unsigned, Bounded signed, IvoryOrd signed) => TwosComplementCast unsigned signed | signed -> unsigned, unsigned -> signed where Source #

Re-interpret the bits of an unsigned integer as though they were a signed number in two's complement representation.

twosComplementCast :: unsigned -> signed Source #

twosComplementRep :: signed -> unsigned Source #

extractByte :: BitCast a Uint8 => a -> (Uint8, a) Source #

Extract the least significant byte from an integer. This returns the two values (x & 0xFF, x >> 8), with the first value safely casted to an 8-bit integer.

This is convenient to use with a state monad and "sets", such as:

fst $ runState x $ do a <- sets extractByte b <- sets extractByte return (a, b)