Copyright	(c) Ross Paterson 2010
License	BSD-style (see the file LICENSE)
Maintainer	R.Paterson@city.ac.uk
Stability	experimental
Portability	portable
Safe Haskell	Safe
Language	Haskell98

Data.Functor.Constant

Description

The constant functor.

Synopsis

newtype Constant a b = Constant {
- getConstant :: a
}

Documentation

newtype Constant a b #

Constant functor.

Constructors

Constant
Fields getConstant :: a

Instances

Instances details

Bitraversable (Constant :: Type -> Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods bitraverse :: Applicative f => (a -> f c) -> (b -> f d) -> Constant a b -> f (Constant c d) Source #
Bifoldable (Constant :: Type -> Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods bifold :: Monoid m => Constant m m -> m Source # bifoldMap :: Monoid m => (a -> m) -> (b -> m) -> Constant a b -> m Source # bifoldr :: (a -> c -> c) -> (b -> c -> c) -> c -> Constant a b -> c Source # bifoldl :: (c -> a -> c) -> (c -> b -> c) -> c -> Constant a b -> c Source #
Bifunctor (Constant :: Type -> Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods bimap :: (a -> b) -> (c -> d) -> Constant a c -> Constant b d Source # first :: (a -> b) -> Constant a c -> Constant b c Source # second :: (b -> c) -> Constant a b -> Constant a c Source #
Eq2 (Constant :: Type -> Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods liftEq2 :: (a -> b -> Bool) -> (c -> d -> Bool) -> Constant a c -> Constant b d -> Bool Source #
Ord2 (Constant :: Type -> Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods liftCompare2 :: (a -> b -> Ordering) -> (c -> d -> Ordering) -> Constant a c -> Constant b d -> Ordering Source #
Read2 (Constant :: Type -> Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods liftReadsPrec2 :: (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> Int -> ReadS (Constant a b) Source # liftReadList2 :: (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> ReadS [Constant a b] Source # liftReadPrec2 :: ReadPrec a -> ReadPrec [a] -> ReadPrec b -> ReadPrec [b] -> ReadPrec (Constant a b) Source # liftReadListPrec2 :: ReadPrec a -> ReadPrec [a] -> ReadPrec b -> ReadPrec [b] -> ReadPrec [Constant a b] Source #
Show2 (Constant :: Type -> Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods liftShowsPrec2 :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> (Int -> b -> ShowS) -> ([b] -> ShowS) -> Int -> Constant a b -> ShowS Source # liftShowList2 :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> (Int -> b -> ShowS) -> ([b] -> ShowS) -> [Constant a b] -> ShowS Source #
Functor (Constant a :: Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods fmap :: (a0 -> b) -> Constant a a0 -> Constant a b Source # (<$) :: a0 -> Constant a b -> Constant a a0 Source #
Monoid a => Applicative (Constant a :: Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods pure :: a0 -> Constant a a0 Source # (<>) :: Constant a (a0 -> b) -> Constant a a0 -> Constant a b Source # liftA2 :: (a0 -> b -> c) -> Constant a a0 -> Constant a b -> Constant a c Source # (>) :: Constant a a0 -> Constant a b -> Constant a b Source # (<*) :: Constant a a0 -> Constant a b -> Constant a a0 Source #
Foldable (Constant a :: Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods fold :: Monoid m => Constant a m -> m Source # foldMap :: Monoid m => (a0 -> m) -> Constant a a0 -> m Source # foldMap' :: Monoid m => (a0 -> m) -> Constant a a0 -> m Source # foldr :: (a0 -> b -> b) -> b -> Constant a a0 -> b Source # foldr' :: (a0 -> b -> b) -> b -> Constant a a0 -> b Source # foldl :: (b -> a0 -> b) -> b -> Constant a a0 -> b Source # foldl' :: (b -> a0 -> b) -> b -> Constant a a0 -> b Source # foldr1 :: (a0 -> a0 -> a0) -> Constant a a0 -> a0 Source # foldl1 :: (a0 -> a0 -> a0) -> Constant a a0 -> a0 Source # toList :: Constant a a0 -> [a0] Source # null :: Constant a a0 -> Bool Source # length :: Constant a a0 -> Int Source # elem :: Eq a0 => a0 -> Constant a a0 -> Bool Source # maximum :: Ord a0 => Constant a a0 -> a0 Source # minimum :: Ord a0 => Constant a a0 -> a0 Source # sum :: Num a0 => Constant a a0 -> a0 Source # product :: Num a0 => Constant a a0 -> a0 Source #
Traversable (Constant a :: Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods traverse :: Applicative f => (a0 -> f b) -> Constant a a0 -> f (Constant a b) Source # sequenceA :: Applicative f => Constant a (f a0) -> f (Constant a a0) Source # mapM :: Monad m => (a0 -> m b) -> Constant a a0 -> m (Constant a b) Source # sequence :: Monad m => Constant a (m a0) -> m (Constant a a0) Source #
Contravariant (Constant a :: Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods contramap :: (a0 -> b) -> Constant a b -> Constant a a0 Source # (>$) :: b -> Constant a b -> Constant a a0 Source #
Eq a => Eq1 (Constant a :: Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods liftEq :: (a0 -> b -> Bool) -> Constant a a0 -> Constant a b -> Bool Source #
Ord a => Ord1 (Constant a :: Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods liftCompare :: (a0 -> b -> Ordering) -> Constant a a0 -> Constant a b -> Ordering Source #
Read a => Read1 (Constant a :: Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods liftReadsPrec :: (Int -> ReadS a0) -> ReadS [a0] -> Int -> ReadS (Constant a a0) Source # liftReadList :: (Int -> ReadS a0) -> ReadS [a0] -> ReadS [Constant a a0] Source # liftReadPrec :: ReadPrec a0 -> ReadPrec [a0] -> ReadPrec (Constant a a0) Source # liftReadListPrec :: ReadPrec a0 -> ReadPrec [a0] -> ReadPrec [Constant a a0] Source #
Show a => Show1 (Constant a :: Type -> Type) #
Instance details Defined in Data.Functor.Constant Methods liftShowsPrec :: (Int -> a0 -> ShowS) -> ([a0] -> ShowS) -> Int -> Constant a a0 -> ShowS Source # liftShowList :: (Int -> a0 -> ShowS) -> ([a0] -> ShowS) -> [Constant a a0] -> ShowS Source #
Eq a => Eq (Constant a b) #
Instance details Defined in Data.Functor.Constant Methods (==) :: Constant a b -> Constant a b -> Bool # (/=) :: Constant a b -> Constant a b -> Bool #
Ord a => Ord (Constant a b) #
Instance details Defined in Data.Functor.Constant Methods compare :: Constant a b -> Constant a b -> Ordering # (<) :: Constant a b -> Constant a b -> Bool # (<=) :: Constant a b -> Constant a b -> Bool # (>) :: Constant a b -> Constant a b -> Bool # (>=) :: Constant a b -> Constant a b -> Bool # max :: Constant a b -> Constant a b -> Constant a b # min :: Constant a b -> Constant a b -> Constant a b #
Read a => Read (Constant a b) #
Instance details Defined in Data.Functor.Constant Methods readsPrec :: Int -> ReadS (Constant a b) Source # readList :: ReadS [Constant a b] Source # readPrec :: ReadPrec (Constant a b) Source # readListPrec :: ReadPrec [Constant a b] Source #
Show a => Show (Constant a b) #
Instance details Defined in Data.Functor.Constant Methods showsPrec :: Int -> Constant a b -> ShowS Source # show :: Constant a b -> String Source # showList :: [Constant a b] -> ShowS Source #
Semigroup a => Semigroup (Constant a b) #
Instance details Defined in Data.Functor.Constant Methods (<>) :: Constant a b -> Constant a b -> Constant a b Source # sconcat :: NonEmpty (Constant a b) -> Constant a b Source # stimes :: Integral b0 => b0 -> Constant a b -> Constant a b Source #
Monoid a => Monoid (Constant a b) #
Instance details Defined in Data.Functor.Constant Methods mempty :: Constant a b Source # mappend :: Constant a b -> Constant a b -> Constant a b Source # mconcat :: [Constant a b] -> Constant a b Source #