This is the "back door" into the IO monad, allowing IO computation to be performed at any time. For this to be safe, the IO computation should be free of side effects and independent of its environment.

If the I/O computation wrapped in unsafePerformIO performs side effects, then the relative order in which those side effects take place (relative to the main I/O trunk, or other calls to unsafePerformIO) is indeterminate. Furthermore, when using unsafePerformIO to cause side-effects, you should take the following precautions to ensure the side effects are performed as many times as you expect them to be. Note that these precautions are necessary for GHC, but may not be sufficient, and other compilers may require different precautions:

Use {-# NOINLINE foo #-} as a pragma on any function foo that calls unsafePerformIO. If the call is inlined, the I/O may be performed more than once.
Use the compiler flag -fno-cse to prevent common sub-expression elimination being performed on the module, which might combine two side effects that were meant to be separate. A good example is using multiple global variables (like test in the example below).
Make sure that the either you switch off let-floating (-fno-full-laziness), or that the call to unsafePerformIO cannot float outside a lambda. For example, if you say: f x = unsafePerformIO (newIORef []) you may get only one reference cell shared between all calls to f. Better would be f x = unsafePerformIO (newIORef [x]) because now it can't float outside the lambda.

It is less well known that unsafePerformIO is not type safe. For example:

    test :: IORef [a]
    test = unsafePerformIO $ newIORef []

    main = do
            writeIORef test [42]
            bang <- readIORef test
            print (bang :: [Char])

This program will core dump. This problem with polymorphic references is well known in the ML community, and does not arise with normal monadic use of references. There is no easy way to make it impossible once you use unsafePerformIO. Indeed, it is possible to write coerce :: a -> b with the help of unsafePerformIO. So be careful!

peek :: Storable a => Ptr a -> IO a #

Read a value from the given memory location.

Note that the peek and poke functions might require properly aligned addresses to function correctly. This is architecture dependent; thus, portable code should ensure that when peeking or poking values of some type a, the alignment constraint for a, as given by the function alignment is fulfilled.

data Ptr a #

A value of type Ptr a represents a pointer to an object, or an array of objects, which may be marshalled to or from Haskell values of type a.

The type a will often be an instance of class Storable which provides the marshalling operations. However this is not essential, and you can provide your own operations to access the pointer. For example you might write small foreign functions to get or set the fields of a C struct.

Instances

Generic1 (URec (Ptr ()) :: k -> *)
Instance details Defined in GHC.Generics Associated Types type Rep1 (URec (Ptr ())) :: k -> * # Methods from1 :: URec (Ptr ()) a -> Rep1 (URec (Ptr ())) a # to1 :: Rep1 (URec (Ptr ())) a -> URec (Ptr ()) a #
Eq (Ptr a)
Instance details Defined in GHC.Ptr Methods (==) :: Ptr a -> Ptr a -> Bool # (/=) :: Ptr a -> Ptr a -> Bool #
Ord (Ptr a)
Instance details Defined in GHC.Ptr Methods compare :: Ptr a -> Ptr a -> Ordering # (<) :: Ptr a -> Ptr a -> Bool # (<=) :: Ptr a -> Ptr a -> Bool # (>) :: Ptr a -> Ptr a -> Bool # (>=) :: Ptr a -> Ptr a -> Bool # max :: Ptr a -> Ptr a -> Ptr a # min :: Ptr a -> Ptr a -> Ptr a #
Show (Ptr a)	Since: base-2.1
Instance details Defined in GHC.Ptr Methods showsPrec :: Int -> Ptr a -> ShowS # show :: Ptr a -> String # showList :: [Ptr a] -> ShowS #
Storable (Ptr a)	Since: base-2.1
Instance details Defined in Foreign.Storable Methods sizeOf :: Ptr a -> Int # alignment :: Ptr a -> Int # peekElemOff :: Ptr (Ptr a) -> Int -> IO (Ptr a) # pokeElemOff :: Ptr (Ptr a) -> Int -> Ptr a -> IO () # peekByteOff :: Ptr b -> Int -> IO (Ptr a) # pokeByteOff :: Ptr b -> Int -> Ptr a -> IO () # peek :: Ptr (Ptr a) -> IO (Ptr a) # poke :: Ptr (Ptr a) -> Ptr a -> IO () #
Functor (URec (Ptr ()) :: * -> *)
Instance details Defined in GHC.Generics Methods fmap :: (a -> b) -> URec (Ptr ()) a -> URec (Ptr ()) b # (<$) :: a -> URec (Ptr ()) b -> URec (Ptr ()) a #
Foldable (URec (Ptr ()) :: * -> *)
Instance details Defined in Data.Foldable Methods fold :: Monoid m => URec (Ptr ()) m -> m # foldMap :: Monoid m => (a -> m) -> URec (Ptr ()) a -> m # foldr :: (a -> b -> b) -> b -> URec (Ptr ()) a -> b # foldr' :: (a -> b -> b) -> b -> URec (Ptr ()) a -> b # foldl :: (b -> a -> b) -> b -> URec (Ptr ()) a -> b # foldl' :: (b -> a -> b) -> b -> URec (Ptr ()) a -> b # foldr1 :: (a -> a -> a) -> URec (Ptr ()) a -> a # foldl1 :: (a -> a -> a) -> URec (Ptr ()) a -> a # toList :: URec (Ptr ()) a -> [a] # null :: URec (Ptr ()) a -> Bool # length :: URec (Ptr ()) a -> Int # elem :: Eq a => a -> URec (Ptr ()) a -> Bool # maximum :: Ord a => URec (Ptr ()) a -> a # minimum :: Ord a => URec (Ptr ()) a -> a # sum :: Num a => URec (Ptr ()) a -> a # product :: Num a => URec (Ptr ()) a -> a #
Traversable (URec (Ptr ()) :: * -> *)
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> URec (Ptr ()) a -> f (URec (Ptr ()) b) # sequenceA :: Applicative f => URec (Ptr ()) (f a) -> f (URec (Ptr ()) a) # mapM :: Monad m => (a -> m b) -> URec (Ptr ()) a -> m (URec (Ptr ()) b) # sequence :: Monad m => URec (Ptr ()) (m a) -> m (URec (Ptr ()) a) #
Eq (URec (Ptr ()) p)
Instance details Defined in GHC.Generics Methods (==) :: URec (Ptr ()) p -> URec (Ptr ()) p -> Bool # (/=) :: URec (Ptr ()) p -> URec (Ptr ()) p -> Bool #
Ord (URec (Ptr ()) p)
Instance details Defined in GHC.Generics Methods compare :: URec (Ptr ()) p -> URec (Ptr ()) p -> Ordering # (<) :: URec (Ptr ()) p -> URec (Ptr ()) p -> Bool # (<=) :: URec (Ptr ()) p -> URec (Ptr ()) p -> Bool # (>) :: URec (Ptr ()) p -> URec (Ptr ()) p -> Bool # (>=) :: URec (Ptr ()) p -> URec (Ptr ()) p -> Bool # max :: URec (Ptr ()) p -> URec (Ptr ()) p -> URec (Ptr ()) p # min :: URec (Ptr ()) p -> URec (Ptr ()) p -> URec (Ptr ()) p #
Generic (URec (Ptr ()) p)
Instance details Defined in GHC.Generics Associated Types type Rep (URec (Ptr ()) p) :: * -> * # Methods from :: URec (Ptr ()) p -> Rep (URec (Ptr ()) p) x # to :: Rep (URec (Ptr ()) p) x -> URec (Ptr ()) p #
data URec (Ptr ()) (p :: k)	Used for marking occurrences of `Addr#` Since: base-4.9.0.0
Instance details Defined in GHC.Generics data URec (Ptr ()) (p :: k) = UAddr { uAddr# :: Addr# }
type Rep1 (URec (Ptr ()) :: k -> *)
Instance details Defined in GHC.Generics type Rep1 (URec (Ptr ()) :: k -> ) = D1 (MetaData "URec" "GHC.Generics" "base" False) (C1 (MetaCons "UAddr" PrefixI True) (S1 (MetaSel (Just "uAddr#") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (UAddr :: k -> )))
type Rep (URec (Ptr ()) p)
Instance details Defined in GHC.Generics type Rep (URec (Ptr ()) p) = D1 (MetaData "URec" "GHC.Generics" "base" False) (C1 (MetaCons "UAddr" PrefixI True) (S1 (MetaSel (Just "uAddr#") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (UAddr :: * -> *)))

nullPtr :: Ptr a #

The constant nullPtr contains a distinguished value of Ptr that is not associated with a valid memory location.

mallocForeignPtrBytes :: Int -> IO (ForeignPtr a) #

This function is similar to mallocForeignPtr, except that the size of the memory required is given explicitly as a number of bytes.

with :: Storable a => a -> (Ptr a -> IO b) -> IO b #

with val f executes the computation f, passing as argument a pointer to a temporarily allocated block of memory into which val has been marshalled (the combination of alloca and poke).

The memory is freed when f terminates (either normally or via an exception), so the pointer passed to f must not be used after this.

withForeignPtr :: ForeignPtr a -> (Ptr a -> IO b) -> IO b #

This is a way to look at the pointer living inside a foreign object. This function takes a function which is applied to that pointer. The resulting IO action is then executed. The foreign object is kept alive at least during the whole action, even if it is not used directly inside. Note that it is not safe to return the pointer from the action and use it after the action completes. All uses of the pointer should be inside the withForeignPtr bracket. The reason for this unsafeness is the same as for unsafeForeignPtrToPtr below: the finalizer may run earlier than expected, because the compiler can only track usage of the ForeignPtr object, not a Ptr object made from it.

This function is normally used for marshalling data to or from the object pointed to by the ForeignPtr, using the operations from the Storable class.

data CInt #

Haskell type representing the C int type.

Instances

Bounded CInt
Instance details Defined in Foreign.C.Types Methods minBound :: CInt # maxBound :: CInt #
Enum CInt
Instance details Defined in Foreign.C.Types Methods succ :: CInt -> CInt # pred :: CInt -> CInt # toEnum :: Int -> CInt # fromEnum :: CInt -> Int # enumFrom :: CInt -> [CInt] # enumFromThen :: CInt -> CInt -> [CInt] # enumFromTo :: CInt -> CInt -> [CInt] # enumFromThenTo :: CInt -> CInt -> CInt -> [CInt] #
Eq CInt
Instance details Defined in Foreign.C.Types Methods (==) :: CInt -> CInt -> Bool # (/=) :: CInt -> CInt -> Bool #
Integral CInt
Instance details Defined in Foreign.C.Types Methods quot :: CInt -> CInt -> CInt # rem :: CInt -> CInt -> CInt # div :: CInt -> CInt -> CInt # mod :: CInt -> CInt -> CInt # quotRem :: CInt -> CInt -> (CInt, CInt) # divMod :: CInt -> CInt -> (CInt, CInt) # toInteger :: CInt -> Integer #
Num CInt
Instance details Defined in Foreign.C.Types Methods (+) :: CInt -> CInt -> CInt # (-) :: CInt -> CInt -> CInt # (*) :: CInt -> CInt -> CInt # negate :: CInt -> CInt # abs :: CInt -> CInt # signum :: CInt -> CInt # fromInteger :: Integer -> CInt #
Ord CInt
Instance details Defined in Foreign.C.Types Methods compare :: CInt -> CInt -> Ordering # (<) :: CInt -> CInt -> Bool # (<=) :: CInt -> CInt -> Bool # (>) :: CInt -> CInt -> Bool # (>=) :: CInt -> CInt -> Bool # max :: CInt -> CInt -> CInt # min :: CInt -> CInt -> CInt #
Read CInt
Instance details Defined in Foreign.C.Types Methods readsPrec :: Int -> ReadS CInt # readList :: ReadS [CInt] # readPrec :: ReadPrec CInt # readListPrec :: ReadPrec [CInt] #
Real CInt
Instance details Defined in Foreign.C.Types Methods toRational :: CInt -> Rational #
Show CInt
Instance details Defined in Foreign.C.Types Methods showsPrec :: Int -> CInt -> ShowS # show :: CInt -> String # showList :: [CInt] -> ShowS #
Storable CInt
Instance details Defined in Foreign.C.Types Methods sizeOf :: CInt -> Int # alignment :: CInt -> Int # peekElemOff :: Ptr CInt -> Int -> IO CInt # pokeElemOff :: Ptr CInt -> Int -> CInt -> IO () # peekByteOff :: Ptr b -> Int -> IO CInt # pokeByteOff :: Ptr b -> Int -> CInt -> IO () # peek :: Ptr CInt -> IO CInt # poke :: Ptr CInt -> CInt -> IO () #
Bits CInt
Instance details Defined in Foreign.C.Types Methods (.&.) :: CInt -> CInt -> CInt # (.\|.) :: CInt -> CInt -> CInt # xor :: CInt -> CInt -> CInt # complement :: CInt -> CInt # shift :: CInt -> Int -> CInt # rotate :: CInt -> Int -> CInt # zeroBits :: CInt # bit :: Int -> CInt # setBit :: CInt -> Int -> CInt # clearBit :: CInt -> Int -> CInt # complementBit :: CInt -> Int -> CInt # testBit :: CInt -> Int -> Bool # bitSizeMaybe :: CInt -> Maybe Int # bitSize :: CInt -> Int # isSigned :: CInt -> Bool # shiftL :: CInt -> Int -> CInt # unsafeShiftL :: CInt -> Int -> CInt # shiftR :: CInt -> Int -> CInt # unsafeShiftR :: CInt -> Int -> CInt # rotateL :: CInt -> Int -> CInt # rotateR :: CInt -> Int -> CInt # popCount :: CInt -> Int #
FiniteBits CInt
Instance details Defined in Foreign.C.Types Methods finiteBitSize :: CInt -> Int # countLeadingZeros :: CInt -> Int # countTrailingZeros :: CInt -> Int #

data CLong #

Haskell type representing the C long type.

Instances

Bounded CLong
Instance details Defined in Foreign.C.Types Methods minBound :: CLong # maxBound :: CLong #
Enum CLong
Instance details Defined in Foreign.C.Types Methods succ :: CLong -> CLong # pred :: CLong -> CLong # toEnum :: Int -> CLong # fromEnum :: CLong -> Int # enumFrom :: CLong -> [CLong] # enumFromThen :: CLong -> CLong -> [CLong] # enumFromTo :: CLong -> CLong -> [CLong] # enumFromThenTo :: CLong -> CLong -> CLong -> [CLong] #
Eq CLong
Instance details Defined in Foreign.C.Types Methods (==) :: CLong -> CLong -> Bool # (/=) :: CLong -> CLong -> Bool #
Integral CLong
Instance details Defined in Foreign.C.Types Methods quot :: CLong -> CLong -> CLong # rem :: CLong -> CLong -> CLong # div :: CLong -> CLong -> CLong # mod :: CLong -> CLong -> CLong # quotRem :: CLong -> CLong -> (CLong, CLong) # divMod :: CLong -> CLong -> (CLong, CLong) # toInteger :: CLong -> Integer #
Num CLong
Instance details Defined in Foreign.C.Types Methods (+) :: CLong -> CLong -> CLong # (-) :: CLong -> CLong -> CLong # (*) :: CLong -> CLong -> CLong # negate :: CLong -> CLong # abs :: CLong -> CLong # signum :: CLong -> CLong # fromInteger :: Integer -> CLong #
Ord CLong
Instance details Defined in Foreign.C.Types Methods compare :: CLong -> CLong -> Ordering # (<) :: CLong -> CLong -> Bool # (<=) :: CLong -> CLong -> Bool # (>) :: CLong -> CLong -> Bool # (>=) :: CLong -> CLong -> Bool # max :: CLong -> CLong -> CLong # min :: CLong -> CLong -> CLong #
Read CLong
Instance details Defined in Foreign.C.Types Methods readsPrec :: Int -> ReadS CLong # readList :: ReadS [CLong] # readPrec :: ReadPrec CLong # readListPrec :: ReadPrec [CLong] #
Real CLong
Instance details Defined in Foreign.C.Types Methods toRational :: CLong -> Rational #
Show CLong
Instance details Defined in Foreign.C.Types Methods showsPrec :: Int -> CLong -> ShowS # show :: CLong -> String # showList :: [CLong] -> ShowS #
Storable CLong
Instance details Defined in Foreign.C.Types Methods sizeOf :: CLong -> Int # alignment :: CLong -> Int # peekElemOff :: Ptr CLong -> Int -> IO CLong # pokeElemOff :: Ptr CLong -> Int -> CLong -> IO () # peekByteOff :: Ptr b -> Int -> IO CLong # pokeByteOff :: Ptr b -> Int -> CLong -> IO () # peek :: Ptr CLong -> IO CLong # poke :: Ptr CLong -> CLong -> IO () #
Bits CLong
Instance details Defined in Foreign.C.Types Methods (.&.) :: CLong -> CLong -> CLong # (.\|.) :: CLong -> CLong -> CLong # xor :: CLong -> CLong -> CLong # complement :: CLong -> CLong # shift :: CLong -> Int -> CLong # rotate :: CLong -> Int -> CLong # zeroBits :: CLong # bit :: Int -> CLong # setBit :: CLong -> Int -> CLong # clearBit :: CLong -> Int -> CLong # complementBit :: CLong -> Int -> CLong # testBit :: CLong -> Int -> Bool # bitSizeMaybe :: CLong -> Maybe Int # bitSize :: CLong -> Int # isSigned :: CLong -> Bool # shiftL :: CLong -> Int -> CLong # unsafeShiftL :: CLong -> Int -> CLong # shiftR :: CLong -> Int -> CLong # unsafeShiftR :: CLong -> Int -> CLong # rotateL :: CLong -> Int -> CLong # rotateR :: CLong -> Int -> CLong # popCount :: CLong -> Int #
FiniteBits CLong
Instance details Defined in Foreign.C.Types Methods finiteBitSize :: CLong -> Int # countLeadingZeros :: CLong -> Int # countTrailingZeros :: CLong -> Int #

data CULong #

Haskell type representing the C unsigned long type.

Instances

Bounded CULong
Instance details Defined in Foreign.C.Types Methods minBound :: CULong # maxBound :: CULong #
Enum CULong
Instance details Defined in Foreign.C.Types Methods succ :: CULong -> CULong # pred :: CULong -> CULong # toEnum :: Int -> CULong # fromEnum :: CULong -> Int # enumFrom :: CULong -> [CULong] # enumFromThen :: CULong -> CULong -> [CULong] # enumFromTo :: CULong -> CULong -> [CULong] # enumFromThenTo :: CULong -> CULong -> CULong -> [CULong] #
Eq CULong
Instance details Defined in Foreign.C.Types Methods (==) :: CULong -> CULong -> Bool # (/=) :: CULong -> CULong -> Bool #
Integral CULong
Instance details Defined in Foreign.C.Types Methods quot :: CULong -> CULong -> CULong # rem :: CULong -> CULong -> CULong # div :: CULong -> CULong -> CULong # mod :: CULong -> CULong -> CULong # quotRem :: CULong -> CULong -> (CULong, CULong) # divMod :: CULong -> CULong -> (CULong, CULong) # toInteger :: CULong -> Integer #
Num CULong
Instance details Defined in Foreign.C.Types Methods (+) :: CULong -> CULong -> CULong # (-) :: CULong -> CULong -> CULong # (*) :: CULong -> CULong -> CULong # negate :: CULong -> CULong # abs :: CULong -> CULong # signum :: CULong -> CULong # fromInteger :: Integer -> CULong #
Ord CULong
Instance details Defined in Foreign.C.Types Methods compare :: CULong -> CULong -> Ordering # (<) :: CULong -> CULong -> Bool # (<=) :: CULong -> CULong -> Bool # (>) :: CULong -> CULong -> Bool # (>=) :: CULong -> CULong -> Bool # max :: CULong -> CULong -> CULong # min :: CULong -> CULong -> CULong #
Read CULong
Instance details Defined in Foreign.C.Types Methods readsPrec :: Int -> ReadS CULong # readList :: ReadS [CULong] # readPrec :: ReadPrec CULong # readListPrec :: ReadPrec [CULong] #
Real CULong
Instance details Defined in Foreign.C.Types Methods toRational :: CULong -> Rational #
Show CULong
Instance details Defined in Foreign.C.Types Methods showsPrec :: Int -> CULong -> ShowS # show :: CULong -> String # showList :: [CULong] -> ShowS #
Storable CULong
Instance details Defined in Foreign.C.Types Methods sizeOf :: CULong -> Int # alignment :: CULong -> Int # peekElemOff :: Ptr CULong -> Int -> IO CULong # pokeElemOff :: Ptr CULong -> Int -> CULong -> IO () # peekByteOff :: Ptr b -> Int -> IO CULong # pokeByteOff :: Ptr b -> Int -> CULong -> IO () # peek :: Ptr CULong -> IO CULong # poke :: Ptr CULong -> CULong -> IO () #
Bits CULong
Instance details Defined in Foreign.C.Types Methods (.&.) :: CULong -> CULong -> CULong # (.\|.) :: CULong -> CULong -> CULong # xor :: CULong -> CULong -> CULong # complement :: CULong -> CULong # shift :: CULong -> Int -> CULong # rotate :: CULong -> Int -> CULong # zeroBits :: CULong # bit :: Int -> CULong # setBit :: CULong -> Int -> CULong # clearBit :: CULong -> Int -> CULong # complementBit :: CULong -> Int -> CULong # testBit :: CULong -> Int -> Bool # bitSizeMaybe :: CULong -> Maybe Int # bitSize :: CULong -> Int # isSigned :: CULong -> Bool # shiftL :: CULong -> Int -> CULong # unsafeShiftL :: CULong -> Int -> CULong # shiftR :: CULong -> Int -> CULong # unsafeShiftR :: CULong -> Int -> CULong # rotateL :: CULong -> Int -> CULong # rotateR :: CULong -> Int -> CULong # popCount :: CULong -> Int #
FiniteBits CULong
Instance details Defined in Foreign.C.Types Methods finiteBitSize :: CULong -> Int # countLeadingZeros :: CULong -> Int # countTrailingZeros :: CULong -> Int #

withCString :: String -> (CString -> IO a) -> IO a #

Marshal a Haskell string into a NUL terminated C string using temporary storage.

the Haskell string may not contain any NUL characters
the memory is freed when the subcomputation terminates (either normally or via an exception), so the pointer to the temporary storage must not be used after this.

peekCString :: CString -> IO String #

Marshal a NUL terminated C string into a Haskell string.

alloca :: Storable a => (Ptr a -> IO b) -> IO b #

alloca f executes the computation f, passing as argument a pointer to a temporarily allocated block of memory sufficient to hold values of type a.

The memory is freed when f terminates (either normally or via an exception), so the pointer passed to f must not be used after this.

peekArray :: Storable a => Int -> Ptr a -> IO [a] #

Convert an array of given length into a Haskell list. The implementation is tail-recursive and so uses constant stack space.

shiftL :: Bits a => a -> Int -> a infixl 8 #

Shift the argument left by the specified number of bits (which must be non-negative).

An instance can define either this and shiftR or the unified shift, depending on which is more convenient for the type in question.

data Word #

A Word is an unsigned integral type, with the same size as Int.

Instances

Bounded Word	Since: base-2.1
Instance details Defined in GHC.Enum Methods minBound :: Word # maxBound :: Word #
Enum Word	Since: base-2.1
Instance details Defined in GHC.Enum Methods succ :: Word -> Word # pred :: Word -> Word # toEnum :: Int -> Word # fromEnum :: Word -> Int # enumFrom :: Word -> [Word] # enumFromThen :: Word -> Word -> [Word] # enumFromTo :: Word -> Word -> [Word] # enumFromThenTo :: Word -> Word -> Word -> [Word] #
Eq Word
Instance details Defined in GHC.Classes Methods (==) :: Word -> Word -> Bool # (/=) :: Word -> Word -> Bool #
Integral Word	Since: base-2.1
Instance details Defined in GHC.Real Methods quot :: Word -> Word -> Word # rem :: Word -> Word -> Word # div :: Word -> Word -> Word # mod :: Word -> Word -> Word # quotRem :: Word -> Word -> (Word, Word) # divMod :: Word -> Word -> (Word, Word) # toInteger :: Word -> Integer #
Num Word	Since: base-2.1
Instance details Defined in GHC.Num Methods (+) :: Word -> Word -> Word # (-) :: Word -> Word -> Word # (*) :: Word -> Word -> Word # negate :: Word -> Word # abs :: Word -> Word # signum :: Word -> Word # fromInteger :: Integer -> Word #
Ord Word
Instance details Defined in GHC.Classes Methods compare :: Word -> Word -> Ordering # (<) :: Word -> Word -> Bool # (<=) :: Word -> Word -> Bool # (>) :: Word -> Word -> Bool # (>=) :: Word -> Word -> Bool # max :: Word -> Word -> Word # min :: Word -> Word -> Word #
Read Word	Since: base-4.5.0.0
Instance details Defined in GHC.Read Methods readsPrec :: Int -> ReadS Word # readList :: ReadS [Word] # readPrec :: ReadPrec Word # readListPrec :: ReadPrec [Word] #
Real Word	Since: base-2.1
Instance details Defined in GHC.Real Methods toRational :: Word -> Rational #
Show Word	Since: base-2.1
Instance details Defined in GHC.Show Methods showsPrec :: Int -> Word -> ShowS # show :: Word -> String # showList :: [Word] -> ShowS #
Storable Word	Since: base-2.1
Instance details Defined in Foreign.Storable Methods sizeOf :: Word -> Int # alignment :: Word -> Int # peekElemOff :: Ptr Word -> Int -> IO Word # pokeElemOff :: Ptr Word -> Int -> Word -> IO () # peekByteOff :: Ptr b -> Int -> IO Word # pokeByteOff :: Ptr b -> Int -> Word -> IO () # peek :: Ptr Word -> IO Word # poke :: Ptr Word -> Word -> IO () #
Bits Word	Since: base-2.1
Instance details Defined in Data.Bits Methods (.&.) :: Word -> Word -> Word # (.\|.) :: Word -> Word -> Word # xor :: Word -> Word -> Word # complement :: Word -> Word # shift :: Word -> Int -> Word # rotate :: Word -> Int -> Word # zeroBits :: Word # bit :: Int -> Word # setBit :: Word -> Int -> Word # clearBit :: Word -> Int -> Word # complementBit :: Word -> Int -> Word # testBit :: Word -> Int -> Bool # bitSizeMaybe :: Word -> Maybe Int # bitSize :: Word -> Int # isSigned :: Word -> Bool # shiftL :: Word -> Int -> Word # unsafeShiftL :: Word -> Int -> Word # shiftR :: Word -> Int -> Word # unsafeShiftR :: Word -> Int -> Word # rotateL :: Word -> Int -> Word # rotateR :: Word -> Int -> Word # popCount :: Word -> Int #
FiniteBits Word	Since: base-4.6.0.0
Instance details Defined in Data.Bits Methods finiteBitSize :: Word -> Int # countLeadingZeros :: Word -> Int # countTrailingZeros :: Word -> Int #
Generic1 (URec Word :: k -> *)
Instance details Defined in GHC.Generics Associated Types type Rep1 (URec Word) :: k -> * # Methods from1 :: URec Word a -> Rep1 (URec Word) a # to1 :: Rep1 (URec Word) a -> URec Word a #
Functor (URec Word :: * -> *)
Instance details Defined in GHC.Generics Methods fmap :: (a -> b) -> URec Word a -> URec Word b # (<$) :: a -> URec Word b -> URec Word a #
Foldable (URec Word :: * -> *)
Instance details Defined in Data.Foldable Methods fold :: Monoid m => URec Word m -> m # foldMap :: Monoid m => (a -> m) -> URec Word a -> m # foldr :: (a -> b -> b) -> b -> URec Word a -> b # foldr' :: (a -> b -> b) -> b -> URec Word a -> b # foldl :: (b -> a -> b) -> b -> URec Word a -> b # foldl' :: (b -> a -> b) -> b -> URec Word a -> b # foldr1 :: (a -> a -> a) -> URec Word a -> a # foldl1 :: (a -> a -> a) -> URec Word a -> a # toList :: URec Word a -> [a] # null :: URec Word a -> Bool # length :: URec Word a -> Int # elem :: Eq a => a -> URec Word a -> Bool # maximum :: Ord a => URec Word a -> a # minimum :: Ord a => URec Word a -> a # sum :: Num a => URec Word a -> a # product :: Num a => URec Word a -> a #
Traversable (URec Word :: * -> *)
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> URec Word a -> f (URec Word b) # sequenceA :: Applicative f => URec Word (f a) -> f (URec Word a) # mapM :: Monad m => (a -> m b) -> URec Word a -> m (URec Word b) # sequence :: Monad m => URec Word (m a) -> m (URec Word a) #
Eq (URec Word p)
Instance details Defined in GHC.Generics Methods (==) :: URec Word p -> URec Word p -> Bool # (/=) :: URec Word p -> URec Word p -> Bool #
Ord (URec Word p)
Instance details Defined in GHC.Generics Methods compare :: URec Word p -> URec Word p -> Ordering # (<) :: URec Word p -> URec Word p -> Bool # (<=) :: URec Word p -> URec Word p -> Bool # (>) :: URec Word p -> URec Word p -> Bool # (>=) :: URec Word p -> URec Word p -> Bool # max :: URec Word p -> URec Word p -> URec Word p # min :: URec Word p -> URec Word p -> URec Word p #
Show (URec Word p)
Instance details Defined in GHC.Generics Methods showsPrec :: Int -> URec Word p -> ShowS # show :: URec Word p -> String # showList :: [URec Word p] -> ShowS #
Generic (URec Word p)
Instance details Defined in GHC.Generics Associated Types type Rep (URec Word p) :: * -> * # Methods from :: URec Word p -> Rep (URec Word p) x # to :: Rep (URec Word p) x -> URec Word p #
data URec Word (p :: k)	Used for marking occurrences of `Word#` Since: base-4.9.0.0
Instance details Defined in GHC.Generics data URec Word (p :: k) = UWord { uWord# :: Word# }
type Rep1 (URec Word :: k -> *)
Instance details Defined in GHC.Generics type Rep1 (URec Word :: k -> ) = D1 (MetaData "URec" "GHC.Generics" "base" False) (C1 (MetaCons "UWord" PrefixI True) (S1 (MetaSel (Just "uWord#") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (UWord :: k -> )))
type Rep (URec Word p)
Instance details Defined in GHC.Generics type Rep (URec Word p) = D1 (MetaData "URec" "GHC.Generics" "base" False) (C1 (MetaCons "UWord" PrefixI True) (S1 (MetaSel (Just "uWord#") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (UWord :: * -> *)))

minPrec :: Precision #