| Copyright | 2009-2015 Edward Kmett |
|---|---|
| License | BSD3 |
| Maintainer | Edward Kmett <ekmett@gmail.com> |
| Stability | experimental |
| Portability | portable |
| Safe Haskell | Safe |
| Language | Haskell98 |
Data.Tagged
Description
Synopsis
- newtype Tagged s b = Tagged {
- unTagged :: b
- retag :: Tagged s b -> Tagged t b
- untag :: Tagged s b -> b
- tagSelf :: a -> Tagged a a
- untagSelf :: Tagged a a -> a
- asTaggedTypeOf :: s -> tagged s b -> s
- witness :: Tagged a b -> a -> b
- proxy :: Tagged s a -> proxy s -> a
- unproxy :: (Proxy s -> a) -> Tagged s a
- tagWith :: proxy s -> a -> Tagged s a
- reproxy :: proxy a -> Proxy b
Tagged values
A value is a value Tagged s bb with an attached phantom type s.
This can be used in place of the more traditional but less safe idiom of
passing in an undefined value with the type, because unlike an (s -> b),
a can't try to use the argument Tagged s bs as a real value.
Moreover, you don't have to rely on the compiler to inline away the extra argument, because the newtype is "free"
Tagged has kind k -> * -> * if the compiler supports PolyKinds, therefore
there is an extra k showing in the instance haddocks that may cause confusion.
Instances
| Bitraversable (Tagged :: Type -> Type -> Type) # | |
Defined in Data.Tagged Methods bitraverse :: Applicative f => (a -> f c) -> (b -> f d) -> Tagged a b -> f (Tagged c d) # | |
| Bifoldable (Tagged :: Type -> Type -> Type) # | |
| Bifunctor (Tagged :: Type -> Type -> Type) # | |
| Eq2 (Tagged :: Type -> Type -> Type) # | |
| Ord2 (Tagged :: Type -> Type -> Type) # | |
Defined in Data.Tagged | |
| Read2 (Tagged :: Type -> Type -> Type) # | |
Defined in Data.Tagged Methods liftReadsPrec2 :: (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> Int -> ReadS (Tagged a b) # liftReadList2 :: (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> ReadS [Tagged a b] # liftReadPrec2 :: ReadPrec a -> ReadPrec [a] -> ReadPrec b -> ReadPrec [b] -> ReadPrec (Tagged a b) # liftReadListPrec2 :: ReadPrec a -> ReadPrec [a] -> ReadPrec b -> ReadPrec [b] -> ReadPrec [Tagged a b] # | |
| Show2 (Tagged :: Type -> Type -> Type) # | |
| Generic1 (Tagged s :: Type -> Type) # | |
| Monad (Tagged s) # | |
| Functor (Tagged s) # | |
| Applicative (Tagged s) # | |
| Foldable (Tagged s) # | |
Defined in Data.Tagged Methods fold :: Monoid m => Tagged s m -> m # foldMap :: Monoid m => (a -> m) -> Tagged s a -> m # foldr :: (a -> b -> b) -> b -> Tagged s a -> b # foldr' :: (a -> b -> b) -> b -> Tagged s a -> b # foldl :: (b -> a -> b) -> b -> Tagged s a -> b # foldl' :: (b -> a -> b) -> b -> Tagged s a -> b # foldr1 :: (a -> a -> a) -> Tagged s a -> a # foldl1 :: (a -> a -> a) -> Tagged s a -> a # elem :: Eq a => a -> Tagged s a -> Bool # maximum :: Ord a => Tagged s a -> a # minimum :: Ord a => Tagged s a -> a # | |
| Traversable (Tagged s) # | |
| Eq1 (Tagged s) # | |
| Ord1 (Tagged s) # | |
Defined in Data.Tagged | |
| Read1 (Tagged s) # | |
Defined in Data.Tagged | |
| Show1 (Tagged s) # | |
| Bounded b => Bounded (Tagged s b) # | |
| Enum a => Enum (Tagged s a) # | |
Defined in Data.Tagged Methods succ :: Tagged s a -> Tagged s a # pred :: Tagged s a -> Tagged s a # fromEnum :: Tagged s a -> Int # enumFrom :: Tagged s a -> [Tagged s a] # enumFromThen :: Tagged s a -> Tagged s a -> [Tagged s a] # enumFromTo :: Tagged s a -> Tagged s a -> [Tagged s a] # enumFromThenTo :: Tagged s a -> Tagged s a -> Tagged s a -> [Tagged s a] # | |
| Eq b => Eq (Tagged s b) # | |
| Floating a => Floating (Tagged s a) # | |
Defined in Data.Tagged Methods exp :: Tagged s a -> Tagged s a # log :: Tagged s a -> Tagged s a # sqrt :: Tagged s a -> Tagged s a # (**) :: Tagged s a -> Tagged s a -> Tagged s a # logBase :: Tagged s a -> Tagged s a -> Tagged s a # sin :: Tagged s a -> Tagged s a # cos :: Tagged s a -> Tagged s a # tan :: Tagged s a -> Tagged s a # asin :: Tagged s a -> Tagged s a # acos :: Tagged s a -> Tagged s a # atan :: Tagged s a -> Tagged s a # sinh :: Tagged s a -> Tagged s a # cosh :: Tagged s a -> Tagged s a # tanh :: Tagged s a -> Tagged s a # asinh :: Tagged s a -> Tagged s a # acosh :: Tagged s a -> Tagged s a # atanh :: Tagged s a -> Tagged s a # log1p :: Tagged s a -> Tagged s a # expm1 :: Tagged s a -> Tagged s a # | |
| Fractional a => Fractional (Tagged s a) # | |
| Integral a => Integral (Tagged s a) # | |
Defined in Data.Tagged Methods quot :: Tagged s a -> Tagged s a -> Tagged s a # rem :: Tagged s a -> Tagged s a -> Tagged s a # div :: Tagged s a -> Tagged s a -> Tagged s a # mod :: Tagged s a -> Tagged s a -> Tagged s a # quotRem :: Tagged s a -> Tagged s a -> (Tagged s a, Tagged s a) # divMod :: Tagged s a -> Tagged s a -> (Tagged s a, Tagged s a) # | |
| (Data s, Data b) => Data (Tagged s b) # | |
Defined in Data.Tagged Methods gfoldl :: (forall d b0. Data d => c (d -> b0) -> d -> c b0) -> (forall g. g -> c g) -> Tagged s b -> c (Tagged s b) # gunfold :: (forall b0 r. Data b0 => c (b0 -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Tagged s b) # toConstr :: Tagged s b -> Constr # dataTypeOf :: Tagged s b -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Tagged s b)) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (Tagged s b)) # gmapT :: (forall b0. Data b0 => b0 -> b0) -> Tagged s b -> Tagged s b # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Tagged s b -> r # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Tagged s b -> r # gmapQ :: (forall d. Data d => d -> u) -> Tagged s b -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> Tagged s b -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Tagged s b -> m (Tagged s b) # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Tagged s b -> m (Tagged s b) # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Tagged s b -> m (Tagged s b) # | |
| Num a => Num (Tagged s a) # | |
Defined in Data.Tagged | |
| Ord b => Ord (Tagged s b) # | |
| Read b => Read (Tagged s b) # | |
| Real a => Real (Tagged s a) # | |
Defined in Data.Tagged Methods toRational :: Tagged s a -> Rational # | |
| RealFloat a => RealFloat (Tagged s a) # | |
Defined in Data.Tagged Methods floatRadix :: Tagged s a -> Integer # floatDigits :: Tagged s a -> Int # floatRange :: Tagged s a -> (Int, Int) # decodeFloat :: Tagged s a -> (Integer, Int) # encodeFloat :: Integer -> Int -> Tagged s a # exponent :: Tagged s a -> Int # significand :: Tagged s a -> Tagged s a # scaleFloat :: Int -> Tagged s a -> Tagged s a # isInfinite :: Tagged s a -> Bool # isDenormalized :: Tagged s a -> Bool # isNegativeZero :: Tagged s a -> Bool # | |
| RealFrac a => RealFrac (Tagged s a) # | |
| Show b => Show (Tagged s b) # | |
| Ix b => Ix (Tagged s b) # | |
Defined in Data.Tagged Methods range :: (Tagged s b, Tagged s b) -> [Tagged s b] # index :: (Tagged s b, Tagged s b) -> Tagged s b -> Int # unsafeIndex :: (Tagged s b, Tagged s b) -> Tagged s b -> Int inRange :: (Tagged s b, Tagged s b) -> Tagged s b -> Bool # rangeSize :: (Tagged s b, Tagged s b) -> Int # unsafeRangeSize :: (Tagged s b, Tagged s b) -> Int | |
| IsString a => IsString (Tagged s a) # | |
Defined in Data.Tagged Methods fromString :: String -> Tagged s a # | |
| Generic (Tagged s b) # | |
| Semigroup a => Semigroup (Tagged s a) # | |
| (Semigroup a, Monoid a) => Monoid (Tagged s a) # | |
| Storable a => Storable (Tagged s a) # | |
Defined in Data.Tagged Methods alignment :: Tagged s a -> Int # peekElemOff :: Ptr (Tagged s a) -> Int -> IO (Tagged s a) # pokeElemOff :: Ptr (Tagged s a) -> Int -> Tagged s a -> IO () # peekByteOff :: Ptr b -> Int -> IO (Tagged s a) # pokeByteOff :: Ptr b -> Int -> Tagged s a -> IO () # | |
| Bits a => Bits (Tagged s a) # | |
Defined in Data.Tagged Methods (.&.) :: Tagged s a -> Tagged s a -> Tagged s a # (.|.) :: Tagged s a -> Tagged s a -> Tagged s a # xor :: Tagged s a -> Tagged s a -> Tagged s a # complement :: Tagged s a -> Tagged s a # shift :: Tagged s a -> Int -> Tagged s a # rotate :: Tagged s a -> Int -> Tagged s a # setBit :: Tagged s a -> Int -> Tagged s a # clearBit :: Tagged s a -> Int -> Tagged s a # complementBit :: Tagged s a -> Int -> Tagged s a # testBit :: Tagged s a -> Int -> Bool # bitSizeMaybe :: Tagged s a -> Maybe Int # bitSize :: Tagged s a -> Int # isSigned :: Tagged s a -> Bool # shiftL :: Tagged s a -> Int -> Tagged s a # unsafeShiftL :: Tagged s a -> Int -> Tagged s a # shiftR :: Tagged s a -> Int -> Tagged s a # unsafeShiftR :: Tagged s a -> Int -> Tagged s a # rotateL :: Tagged s a -> Int -> Tagged s a # | |
| FiniteBits a => FiniteBits (Tagged s a) # | |
Defined in Data.Tagged Methods finiteBitSize :: Tagged s a -> Int # countLeadingZeros :: Tagged s a -> Int # countTrailingZeros :: Tagged s a -> Int # | |
| NFData b => NFData (Tagged s b) # | |
Defined in Data.Tagged | |
| type Rep1 (Tagged s :: Type -> Type) # | |
Defined in Data.Tagged | |
| type Rep (Tagged s b) # | |
Defined in Data.Tagged | |
asTaggedTypeOf :: s -> tagged s b -> s #
asTaggedTypeOf is a type-restricted version of const. It is usually used as an infix operator, and its typing forces its first argument (which is usually overloaded) to have the same type as the tag of the second.