base-4.20.2.0: Core data structures and operations

License | BSD-style (see the LICENSE file in the distribution)
Maintainer | libraries@haskell.org
Stability | stable
Portability | portable
Safe Haskell | Safe
Language | Haskell2010

Data.Proxy

Description

Definition of a Proxy type (poly-kinded in GHC)

Since: base-4.7.0.0

Synopsis

- data Proxy (t :: k) = Proxy
- asProxyTypeOf :: a -> proxy a -> a
- data KProxy t = KProxy

# Documentation

data Proxy (t :: k) Source #

`Proxy` is a type that holds no data, but has a phantom parameter of arbitrary type (or even kind). Its use is to provide type information, even though there is no value available of that type (or it may be too costly to create one).

Historically, ``Proxy` :: `Proxy` a` is a safer alternative to the ``undefined` :: a` idiom.

    >>> Proxy :: Proxy (Void, Int -> Int)
    Proxy

Proxy can even hold types of higher kinds,

    >>> Proxy :: Proxy Either
    Proxy

    >>> Proxy :: Proxy Functor
    Proxy

    >>> Proxy :: Proxy complicatedStructure
    Proxy

Constructors

Proxy |

#### Instances

Instances details

Generic1 (Proxy :: k -> Type) |

Instance details

Defined in GHC.Internal.Generics

Associated Types

type Rep1 (Proxy :: k -> Type) | Since: base-4.6.0.0
Instance details Defined in GHC.Internal.Generics type Rep1 (Proxy :: k -> Type) = D1 ('MetaData "Proxy" "GHC.Internal.Data.Proxy" "ghc-internal" 'False) (C1 ('MetaCons "Proxy" 'PrefixI 'False) (U1 :: k -> Type))

Methods

from1 :: forall (a :: k). Proxy a -> Rep1 (Proxy :: k -> Type) a Source #

to1 :: forall (a :: k). Rep1 (Proxy :: k -> Type) a -> Proxy a Source #

MonadZip (Proxy :: Type -> Type) Source # | Since: base-4.9.0.0
Instance details Defined in Control.Monad.Zip Methods mzip :: Proxy a -> Proxy b -> Proxy (a, b) Source # mzipWith :: (a -> b -> c) -> Proxy a -> Proxy b -> Proxy c Source # munzip :: Proxy (a, b) -> (Proxy a, Proxy b) Source #
Eq1 (Proxy :: Type -> Type) Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftEq :: (a -> b -> Bool) -> Proxy a -> Proxy b -> Bool Source #
Ord1 (Proxy :: Type -> Type) Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftCompare :: (a -> b -> Ordering) -> Proxy a -> Proxy b -> Ordering Source #
Read1 (Proxy :: Type -> Type) Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftReadsPrec :: (Int -> ReadS a) -> ReadS [a] -> Int -> ReadS (Proxy a) Source # liftReadList :: (Int -> ReadS a) -> ReadS [a] -> ReadS [Proxy a] Source # liftReadPrec :: ReadPrec a -> ReadPrec [a] -> ReadPrec (Proxy a) Source # liftReadListPrec :: ReadPrec a -> ReadPrec [a] -> ReadPrec [Proxy a] Source #
Show1 (Proxy :: Type -> Type) Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftShowsPrec :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> Proxy a -> ShowS Source # liftShowList :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> [Proxy a] -> ShowS Source #
Contravariant (Proxy :: Type -> Type) Source # |
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> Proxy a -> Proxy a' Source # (>$) :: b -> Proxy b -> Proxy a Source #
Alternative (Proxy :: Type -> Type) | Since: base-4.9.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods empty :: Proxy a Source # (<|>) :: Proxy a -> Proxy a -> Proxy a Source # some :: Proxy a -> Proxy [a] Source # many :: Proxy a -> Proxy [a] Source #
Applicative (Proxy :: Type -> Type) | Since: base-4.7.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods pure :: a -> Proxy a Source # (<*>) :: Proxy (a -> b) -> Proxy a -> Proxy b Source # liftA2 :: (a -> b -> c) -> Proxy a -> Proxy b -> Proxy c Source # (*>) :: Proxy a -> Proxy b -> Proxy b Source # (<*) :: Proxy a -> Proxy b -> Proxy a Source #
Functor (Proxy :: Type -> Type) | Since: base-4.7.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods fmap :: (a -> b) -> Proxy a -> Proxy b Source # (<$) :: a -> Proxy b -> Proxy a Source #
Monad (Proxy :: Type -> Type) | Since: base-4.7.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods (>>=) :: Proxy a -> (a -> Proxy b) -> Proxy b Source # (>>) :: Proxy a -> Proxy b -> Proxy b Source # return :: a -> Proxy a Source #
MonadPlus (Proxy :: Type -> Type) | Since: base-4.9.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods mzero :: Proxy a Source # mplus :: Proxy a -> Proxy a -> Proxy a Source #
Foldable (Proxy :: Type -> Type) | Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Foldable

Methods

fold :: Monoid m => Proxy m -> m Source #

foldMap :: Monoid m => (a -> m) -> Proxy a -> m Source #

foldMap' :: Monoid m => (a -> m) -> Proxy a -> m Source #

foldr :: (a -> b -> b) -> b -> Proxy a -> b Source #

foldr' :: (a -> b -> b) -> b -> Proxy a -> b Source #

foldl :: (b -> a -> b) -> b -> Proxy a -> b Source #

foldl' :: (b -> a -> b) -> b -> Proxy a -> b Source #

foldr1 :: (a -> a -> a) -> Proxy a -> a Source #

foldl1 :: (a -> a -> a) -> Proxy a -> a Source #

toList :: Proxy a -> [a] Source #

null :: Proxy a -> Bool Source #

length :: Proxy a -> Int Source #

elem :: Eq a => a -> Proxy a -> Bool Source #

maximum :: Ord a => Proxy a -> a Source #

minimum :: Ord a => Proxy a -> a Source #

sum :: Num a => Proxy a -> a Source #

product :: Num a => Proxy a -> a Source #

Traversable (Proxy :: Type -> Type) | Since: base-4.7.0.0
Instance details Defined in GHC.Internal.Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Proxy a -> f (Proxy b) Source # sequenceA :: Applicative f => Proxy (f a) -> f (Proxy a) Source # mapM :: Monad m => (a -> m b) -> Proxy a -> m (Proxy b) Source # sequence :: Monad m => Proxy (m a) -> m (Proxy a) Source #
Monoid (Proxy s) | Since: base-4.7.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods mempty :: Proxy s Source # mappend :: Proxy s -> Proxy s -> Proxy s Source # mconcat :: [Proxy s] -> Proxy s Source #
Semigroup (Proxy s) | Since: base-4.9.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods (<>) :: Proxy s -> Proxy s -> Proxy s Source # sconcat :: NonEmpty (Proxy s) -> Proxy s Source # stimes :: Integral b => b -> Proxy s -> Proxy s Source #
Data t => Data (Proxy t) | Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Data

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Proxy t -> c (Proxy t) Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Proxy t) Source #

toConstr :: Proxy t -> Constr Source #

dataTypeOf :: Proxy t -> DataType Source #

dataCast1 :: Typeable t0 => (forall d. Data d => c (t0 d)) -> Maybe (c (Proxy t)) Source #

dataCast2 :: Typeable t0 => (forall d e. (Data d, Data e) => c (t0 d e)) -> Maybe (c (Proxy t)) Source #

gmapT :: (forall b. Data b => b -> b) -> Proxy t -> Proxy t Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Proxy t -> r Source #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Proxy t -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> Proxy t -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Proxy t -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Proxy t -> m (Proxy t) Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Proxy t -> m (Proxy t) Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Proxy t -> m (Proxy t) Source #

Bounded (Proxy t) | Since: base-4.7.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods minBound :: Proxy t Source # maxBound :: Proxy t Source #
Enum (Proxy s) | Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

succ :: Proxy s -> Proxy s Source #

pred :: Proxy s -> Proxy s Source #

toEnum :: Int -> Proxy s Source #

fromEnum :: Proxy s -> Int Source #

enumFrom :: Proxy s -> [Proxy s] Source #

enumFromThen :: Proxy s -> Proxy s -> [Proxy s] Source #

enumFromTo :: Proxy s -> Proxy s -> [Proxy s] Source #

enumFromThenTo :: Proxy s -> Proxy s -> Proxy s -> [Proxy s] Source #

Generic (Proxy t) |

Instance details

Defined in GHC.Internal.Generics

Associated Types

type Rep (Proxy t) | Since: base-4.6.0.0
Instance details Defined in GHC.Internal.Generics type Rep (Proxy t) = D1 ('MetaData "Proxy" "GHC.Internal.Data.Proxy" "ghc-internal" 'False) (C1 ('MetaCons "Proxy" 'PrefixI 'False) (U1 :: Type -> Type))

Methods

from :: Proxy t -> Rep (Proxy t) x Source #

to :: Rep (Proxy t) x -> Proxy t Source #

Ix (Proxy s) | Since: base-4.7.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods range :: (Proxy s, Proxy s) -> [Proxy s] Source # index :: (Proxy s, Proxy s) -> Proxy s -> Int Source # unsafeIndex :: (Proxy s, Proxy s) -> Proxy s -> Int Source # inRange :: (Proxy s, Proxy s) -> Proxy s -> Bool Source # rangeSize :: (Proxy s, Proxy s) -> Int Source # unsafeRangeSize :: (Proxy s, Proxy s) -> Int Source #
Read (Proxy t) | Since: base-4.7.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods readsPrec :: Int -> ReadS (Proxy t) Source # readList :: ReadS [Proxy t] Source # readPrec :: ReadPrec (Proxy t) Source # readListPrec :: ReadPrec [Proxy t] Source #
Show (Proxy s) | Since: base-4.7.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods showsPrec :: Int -> Proxy s -> ShowS Source # show :: Proxy s -> String Source # showList :: [Proxy s] -> ShowS Source #
Eq (Proxy s) | Since: base-4.7.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods (==) :: Proxy s -> Proxy s -> Bool Source # (/=) :: Proxy s -> Proxy s -> Bool Source #
Ord (Proxy s) | Since: base-4.7.0.0
Instance details Defined in GHC.Internal.Data.Proxy Methods compare :: Proxy s -> Proxy s -> Ordering Source # (<) :: Proxy s -> Proxy s -> Bool Source # (<=) :: Proxy s -> Proxy s -> Bool Source # (>) :: Proxy s -> Proxy s -> Bool Source # (>=) :: Proxy s -> Proxy s -> Bool Source # max :: Proxy s -> Proxy s -> Proxy s Source # min :: Proxy s -> Proxy s -> Proxy s Source #
type Rep1 (Proxy :: k -> Type) | Since: base-4.6.0.0
Instance details Defined in GHC.Internal.Generics type Rep1 (Proxy :: k -> Type) = D1 ('MetaData "Proxy" "GHC.Internal.Data.Proxy" "ghc-internal" 'False) (C1 ('MetaCons "Proxy" 'PrefixI 'False) (U1 :: k -> Type))
type Rep (Proxy t) | Since: base-4.6.0.0
Instance details Defined in GHC.Internal.Generics type Rep (Proxy t) = D1 ('MetaData "Proxy" "GHC.Internal.Data.Proxy" "ghc-internal" 'False) (C1 ('MetaCons "Proxy" 'PrefixI 'False) (U1 :: Type -> Type))

asProxyTypeOf :: a -> proxy a -> a Source #

`asProxyTypeOf` 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.

    >>> import GHC.Internal.Word
    >>> :type asProxyTypeOf 123 (Proxy :: Proxy Word8)
    asProxyTypeOf 123 (Proxy :: Proxy Word8) :: Word8

Note the lower-case `proxy` in the definition. This allows any type constructor with just one argument to be passed to the function, for example we could also write

    >>> import GHC.Internal.Word
    >>> :type asProxyTypeOf 123 (Just (undefined :: Word8))
    asProxyTypeOf 123 (Just (undefined :: Word8)) :: Word8

data KProxy t Source #

A concrete, promotable proxy type, for use at the kind level. There are no instances for this because it is intended at the kind level only

Constructors

KProxy |