UUID

Documentation

data UUID

The UUID type. A Random instance is provided which produces version 4 UUIDs as specified in RFC 4122. The Storable and Binary instances are compatible with RFC 4122, storing the fields in network order as 16 bytes.

Instances

Eq UUID

Defined in Data.UUID.Types.Internal

Methods

(==) :: UUID -> UUID -> Bool

(/=) :: UUID -> UUID -> Bool

Data UUID

Defined in Data.UUID.Types.Internal

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> UUID -> c UUID

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c UUID

toConstr :: UUID -> Constr

dataTypeOf :: UUID -> DataType

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c UUID)

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c UUID)

gmapT :: (forall b. Data b => b -> b) -> UUID -> UUID

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> UUID -> r

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> UUID -> r

gmapQ :: (forall d. Data d => d -> u) -> UUID -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> UUID -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> UUID -> m UUID

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> UUID -> m UUID

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> UUID -> m UUID

Ord UUID

Defined in Data.UUID.Types.Internal

Methods

compare :: UUID -> UUID -> Ordering

(<) :: UUID -> UUID -> Bool

(<=) :: UUID -> UUID -> Bool

(>) :: UUID -> UUID -> Bool

(>=) :: UUID -> UUID -> Bool

max :: UUID -> UUID -> UUID

min :: UUID -> UUID -> UUID

Read UUID

Defined in Data.UUID.Types.Internal

Methods

readsPrec :: Int -> ReadS UUID

readList :: ReadS [UUID]

readPrec :: ReadPrec UUID

readListPrec :: ReadPrec [UUID]

Show UUID

Defined in Data.UUID.Types.Internal

Methods

showsPrec :: Int -> UUID -> ShowS

show :: UUID -> String

showList :: [UUID] -> ShowS

Hashable UUID

Defined in Data.UUID.Types.Internal

Methods

hashWithSalt :: Int -> UUID -> Int

hash :: UUID -> Int

ToJSON UUID

Defined in Data.Aeson.Types.ToJSON

Methods

toJSON :: UUID -> Value

toEncoding :: UUID -> Encoding

toJSONList :: [UUID] -> Value

toEncodingList :: [UUID] -> Encoding

ToJSONKey UUID

Defined in Data.Aeson.Types.ToJSON

Methods

toJSONKey :: ToJSONKeyFunction UUID

toJSONKeyList :: ToJSONKeyFunction [UUID]

FromJSON UUID

Defined in Data.Aeson.Types.FromJSON

Methods

parseJSON :: Value -> Parser UUID

parseJSONList :: Value -> Parser [UUID]

FromJSONKey UUID

Defined in Data.Aeson.Types.FromJSON

Methods

fromJSONKey :: FromJSONKeyFunction UUID

fromJSONKeyList :: FromJSONKeyFunction [UUID]

Storable UUID

Defined in Data.UUID.Types.Internal

Methods

sizeOf :: UUID -> Int

alignment :: UUID -> Int

peekElemOff :: Ptr UUID -> Int -> IO UUID

pokeElemOff :: Ptr UUID -> Int -> UUID -> IO ()

peekByteOff :: Ptr b -> Int -> IO UUID

pokeByteOff :: Ptr b -> Int -> UUID -> IO ()

peek :: Ptr UUID -> IO UUID

poke :: Ptr UUID -> UUID -> IO ()

Binary UUID

Defined in Data.UUID.Types.Internal

Methods

put :: UUID -> Put

get :: Get UUID

putList :: [UUID] -> Put

NFData UUID

Defined in Data.UUID.Types.Internal

Methods

rnf :: UUID -> ()

Random UUID

Defined in Data.UUID.Types.Internal

Methods

randomR :: RandomGen g => (UUID, UUID) -> g -> (UUID, g)

random :: RandomGen g => g -> (UUID, g)

randomRs :: RandomGen g => (UUID, UUID) -> g -> [UUID]

randoms :: RandomGen g => g -> [UUID]

randomRIO :: (UUID, UUID) -> IO UUID

randomIO :: IO UUID

toText :: UUID -> Text

Convert a UUID into a hyphentated string using lower-case letters.

fromText :: Text -> Maybe UUID

If the passed in Text can be parsed as an ASCII representation of a UUID, it will be. The hyphens may not be omitted.

toByteString :: UUID -> ByteString

Encode a UUID into a ByteString in network order.

fromByteString :: ByteString -> Maybe UUID

Extract a UUID from a ByteString in network byte order. The argument must be 16 bytes long, otherwise Nothing is returned.

toWords :: UUID -> (Word32, Word32, Word32, Word32)

Covert a UUID into a sequence of Word32 values. Useful for when you need to serialize a UUID and neither Storable nor Binary are appropriate. Introduced in version 1.2.2.

fromWords :: Word32 -> Word32 -> Word32 -> Word32 -> UUID

Create a UUID from a sequence of Word32. The opposite of toWords. Useful when you need a total function for constructing UUID values. Introduced in version 1.2.2.

null :: UUID -> Bool

Returns true if the passed-in UUID is the nil UUID.

nil :: UUID

The nil UUID, as defined in RFC 4122. It is a UUID of all zeros. null u iff u == nil.

generateNamed

Arguments

:: UUID

Namespace

-> [Word8]

Object

-> UUID

Generate a UUID within the specified namespace out of the given object.

Uses a SHA1 hash. The UUID is built from first 128 bits of the hash of the namespace UUID and the name (as a series of Word8).

namespaceDNS :: UUID

The namespace for DNS addresses

namespaceURL :: UUID

The namespace for URLs

namespaceOID :: UUID

The namespace for ISO OIDs

namespaceX500 :: UUID

The namespace for X.500 DNs