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

Data.Proxy

Description

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

Since: 4.7.0.0

Synopsis

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

Documentation

data Proxy t Source #

A concrete, poly-kinded proxy type

Constructors

Proxy

Instances

Generic1 k (Proxy k) Source #

Associated Types

type Rep1 (Proxy k) (f :: Proxy k -> *) :: k -> * Source #

Methods

from1 :: f a -> Rep1 (Proxy k) f a Source #

to1 :: Rep1 (Proxy k) f a -> f a Source #

Monad (Proxy *) Source #

Since: 4.7.0.0

Methods

(>>=) :: Proxy * a -> (a -> Proxy * b) -> Proxy * b Source #

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

return :: a -> Proxy * a Source #

fail :: String -> Proxy * a Source #

Functor (Proxy *) Source #

Since: 4.7.0.0

Methods

fmap :: (a -> b) -> Proxy * a -> Proxy * b Source #

(<$) :: a -> Proxy * b -> Proxy * a Source #

Applicative (Proxy *) Source #

Since: 4.7.0.0

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 #

Foldable (Proxy *) Source #

Since: 4.7.0.0

Methods

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

Since: 4.7.0.0

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 #

MonadPlus (Proxy *) Source #

Since: 4.9.0.0

Methods

mzero :: Proxy * a Source #

mplus :: Proxy * a -> Proxy * a -> Proxy * a Source #

Alternative (Proxy *) Source #

Since: 4.9.0.0

Methods

empty :: Proxy * a Source #

(<|>) :: Proxy * a -> Proxy * a -> Proxy * a Source #

some :: Proxy * a -> Proxy * [a] Source #

many :: Proxy * a -> Proxy * [a] Source #

MonadZip (Proxy *) Source #

Since: 4.9.0.0

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 #

Show1 (Proxy *) Source #

Since: 4.9.0.0

Methods

liftShowsPrec :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> Proxy * a -> ShowS Source #

liftShowList :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> [Proxy * a] -> ShowS Source #

Read1 (Proxy *) Source #

Since: 4.9.0.0

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 #

Ord1 (Proxy *) Source #

Since: 4.9.0.0

Methods

liftCompare :: (a -> b -> Ordering) -> Proxy * a -> Proxy * b -> Ordering Source #

Eq1 (Proxy *) Source #

Since: 4.9.0.0

Methods

liftEq :: (a -> b -> Bool) -> Proxy * a -> Proxy * b -> Bool Source #

Bounded (Proxy k t) Source #

Methods

minBound :: Proxy k t Source #

maxBound :: Proxy k t Source #

Enum (Proxy k s) Source #

Since: 4.7.0.0

Methods

succ :: Proxy k s -> Proxy k s Source #

pred :: Proxy k s -> Proxy k s Source #

toEnum :: Int -> Proxy k s Source #

fromEnum :: Proxy k s -> Int Source #

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

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

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

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

Eq (Proxy k s) Source #

Since: 4.7.0.0

Methods

(==) :: Proxy k s -> Proxy k s -> Bool #

(/=) :: Proxy k s -> Proxy k s -> Bool #

Data t => Data (Proxy * t) Source #

Since: 4.7.0.0

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 (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c (Proxy * t)) Source #

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

Ord (Proxy k s) Source #

Since: 4.7.0.0

Methods

compare :: Proxy k s -> Proxy k s -> Ordering #

(<) :: Proxy k s -> Proxy k s -> Bool #

(<=) :: Proxy k s -> Proxy k s -> Bool #

(>) :: Proxy k s -> Proxy k s -> Bool #

(>=) :: Proxy k s -> Proxy k s -> Bool #

max :: Proxy k s -> Proxy k s -> Proxy k s #

min :: Proxy k s -> Proxy k s -> Proxy k s #

Read (Proxy k s) Source #

Since: 4.7.0.0

Methods

readsPrec :: Int -> ReadS (Proxy k s) Source #

readList :: ReadS [Proxy k s] Source #

readPrec :: ReadPrec (Proxy k s) Source #

readListPrec :: ReadPrec [Proxy k s] Source #

Show (Proxy k s) Source #

Since: 4.7.0.0

Methods

showsPrec :: Int -> Proxy k s -> ShowS Source #

show :: Proxy k s -> String Source #

showList :: [Proxy k s] -> ShowS Source #

Ix (Proxy k s) Source #

Since: 4.7.0.0

Methods

range :: (Proxy k s, Proxy k s) -> [Proxy k s] Source #

index :: (Proxy k s, Proxy k s) -> Proxy k s -> Int Source #

unsafeIndex :: (Proxy k s, Proxy k s) -> Proxy k s -> Int

inRange :: (Proxy k s, Proxy k s) -> Proxy k s -> Bool Source #

rangeSize :: (Proxy k s, Proxy k s) -> Int Source #

unsafeRangeSize :: (Proxy k s, Proxy k s) -> Int

Generic (Proxy k t) Source #

Associated Types

type Rep (Proxy k t) :: * -> * Source #

Methods

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

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

Semigroup (Proxy k s) Source #

Since: 4.9.0.0

Methods

(<>) :: Proxy k s -> Proxy k s -> Proxy k s Source #

sconcat :: NonEmpty (Proxy k s) -> Proxy k s Source #

stimes :: Integral b => b -> Proxy k s -> Proxy k s Source #

Monoid (Proxy k s) Source #

Since: 4.7.0.0

Methods

mempty :: Proxy k s Source #

mappend :: Proxy k s -> Proxy k s -> Proxy k s Source #

mconcat :: [Proxy k s] -> Proxy k s Source #

type Rep1 k (Proxy k) Source #

type Rep1 k (Proxy k) = D1 k (MetaData "Proxy" "Data.Proxy" "base" False) (C1 k (MetaCons "Proxy" PrefixI False) (U1 k))

type Rep (Proxy k t) Source #

type Rep (Proxy k t) = D1 * (MetaData "Proxy" "Data.Proxy" "base" False) (C1 * (MetaCons "Proxy" PrefixI False) (U1 *))

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.

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