Copyright	(c) Russell O'Connor 2009
License	BSD-style (see the file LICENSE)
Maintainer	R.Paterson@city.ac.uk
Stability	experimental
Portability	portable
Safe Haskell	Safe
Language	Haskell98

Control.Applicative.Backwards

Description

Making functors with an Applicative instance that performs actions in the reverse order.

Synopsis

newtype Backwards f a = Backwards {
- forwards :: f a
}

Documentation

newtype Backwards f a Source #

The same functor, but with an Applicative instance that performs actions in the reverse order.

Constructors

Backwards
Fields forwards :: f a

Instances

Functor f => Functor (Backwards f) Source #	Derived instance.
Instance details Methods fmap :: (a -> b) -> Backwards f a -> Backwards f b # (<$) :: a -> Backwards f b -> Backwards f a #
Applicative f => Applicative (Backwards f) Source #	Apply `f`-actions in the reverse order.
Instance details Methods pure :: a -> Backwards f a # (<>) :: Backwards f (a -> b) -> Backwards f a -> Backwards f b # liftA2 :: (a -> b -> c) -> Backwards f a -> Backwards f b -> Backwards f c # (>) :: Backwards f a -> Backwards f b -> Backwards f b # (<*) :: Backwards f a -> Backwards f b -> Backwards f a #
Foldable f => Foldable (Backwards f) Source #	Derived instance.
Instance details Methods fold :: Monoid m => Backwards f m -> m # foldMap :: Monoid m => (a -> m) -> Backwards f a -> m # foldr :: (a -> b -> b) -> b -> Backwards f a -> b # foldr' :: (a -> b -> b) -> b -> Backwards f a -> b # foldl :: (b -> a -> b) -> b -> Backwards f a -> b # foldl' :: (b -> a -> b) -> b -> Backwards f a -> b # foldr1 :: (a -> a -> a) -> Backwards f a -> a # foldl1 :: (a -> a -> a) -> Backwards f a -> a # toList :: Backwards f a -> [a] # null :: Backwards f a -> Bool # length :: Backwards f a -> Int # elem :: Eq a => a -> Backwards f a -> Bool # maximum :: Ord a => Backwards f a -> a # minimum :: Ord a => Backwards f a -> a # sum :: Num a => Backwards f a -> a # product :: Num a => Backwards f a -> a #
Traversable f => Traversable (Backwards f) Source #	Derived instance.
Instance details Methods traverse :: Applicative f0 => (a -> f0 b) -> Backwards f a -> f0 (Backwards f b) # sequenceA :: Applicative f0 => Backwards f (f0 a) -> f0 (Backwards f a) # mapM :: Monad m => (a -> m b) -> Backwards f a -> m (Backwards f b) # sequence :: Monad m => Backwards f (m a) -> m (Backwards f a) #
Eq1 f => Eq1 (Backwards f) Source #
Instance details Methods liftEq :: (a -> b -> Bool) -> Backwards f a -> Backwards f b -> Bool #
Ord1 f => Ord1 (Backwards f) Source #
Instance details Methods liftCompare :: (a -> b -> Ordering) -> Backwards f a -> Backwards f b -> Ordering #
Read1 f => Read1 (Backwards f) Source #
Instance details Methods liftReadsPrec :: (Int -> ReadS a) -> ReadS [a] -> Int -> ReadS (Backwards f a) # liftReadList :: (Int -> ReadS a) -> ReadS [a] -> ReadS [Backwards f a] # liftReadPrec :: ReadPrec a -> ReadPrec [a] -> ReadPrec (Backwards f a) # liftReadListPrec :: ReadPrec a -> ReadPrec [a] -> ReadPrec [Backwards f a] #
Show1 f => Show1 (Backwards f) Source #
Instance details Methods liftShowsPrec :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> Backwards f a -> ShowS # liftShowList :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> [Backwards f a] -> ShowS #
Alternative f => Alternative (Backwards f) Source #	Try alternatives in the same order as `f`.
Instance details Methods empty :: Backwards f a # (<\|>) :: Backwards f a -> Backwards f a -> Backwards f a # some :: Backwards f a -> Backwards f [a] # many :: Backwards f a -> Backwards f [a] #
(Eq1 f, Eq a) => Eq (Backwards f a) Source #
Instance details Methods (==) :: Backwards f a -> Backwards f a -> Bool # (/=) :: Backwards f a -> Backwards f a -> Bool #
(Ord1 f, Ord a) => Ord (Backwards f a) Source #
Instance details Methods compare :: Backwards f a -> Backwards f a -> Ordering # (<) :: Backwards f a -> Backwards f a -> Bool # (<=) :: Backwards f a -> Backwards f a -> Bool # (>) :: Backwards f a -> Backwards f a -> Bool # (>=) :: Backwards f a -> Backwards f a -> Bool # max :: Backwards f a -> Backwards f a -> Backwards f a # min :: Backwards f a -> Backwards f a -> Backwards f a #
(Read1 f, Read a) => Read (Backwards f a) Source #
Instance details Methods readsPrec :: Int -> ReadS (Backwards f a) # readList :: ReadS [Backwards f a] # readPrec :: ReadPrec (Backwards f a) # readListPrec :: ReadPrec [Backwards f a] #
(Show1 f, Show a) => Show (Backwards f a) Source #
Instance details Methods showsPrec :: Int -> Backwards f a -> ShowS # show :: Backwards f a -> String # showList :: [Backwards f a] -> ShowS #