Control.Applicative.Backwards

Control.Applicative.Backwards

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

Description

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

newtype Backwards f a Source

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

Constructors

Backwards

Fields

Instances

Functor f => Functor (Backwards * f)

Derived instance.

Methods

fmap :: (a -> b) -> Backwards * f a -> Backwards * f b Source

(<$) :: a -> Backwards * f b -> Backwards * f a Source

Applicative f => Applicative (Backwards * f)

Apply f-actions in the reverse order.

Methods

pure :: a -> Backwards * f a Source

(<*>) :: Backwards * f (a -> b) -> Backwards * f a -> Backwards * f b Source

(*>) :: Backwards * f a -> Backwards * f b -> Backwards * f b Source

(<*) :: Backwards * f a -> Backwards * f b -> Backwards * f a Source

Foldable f => Foldable (Backwards * f)

Derived instance.

Methods

fold :: Monoid m => Backwards * f m -> m Source

foldMap :: Monoid m => (a -> m) -> Backwards * f a -> m Source

foldr :: (a -> b -> b) -> b -> Backwards * f a -> b Source

foldr' :: (a -> b -> b) -> b -> Backwards * f a -> b Source

foldl :: (b -> a -> b) -> b -> Backwards * f a -> b Source

foldl' :: (b -> a -> b) -> b -> Backwards * f a -> b Source

foldr1 :: (a -> a -> a) -> Backwards * f a -> a Source

foldl1 :: (a -> a -> a) -> Backwards * f a -> a Source

toList :: Backwards * f a -> [a] Source

null :: Backwards * f a -> Bool Source

length :: Backwards * f a -> Int Source

elem :: Eq a => a -> Backwards * f a -> Bool Source

maximum :: Ord a => Backwards * f a -> a Source

minimum :: Ord a => Backwards * f a -> a Source

sum :: Num a => Backwards * f a -> a Source

product :: Num a => Backwards * f a -> a Source

Traversable f => Traversable (Backwards * f)

Derived instance.

Methods

traverse :: Applicative f => (a -> f b) -> Backwards * f a -> f (Backwards * f b) Source

sequenceA :: Applicative f => Backwards * f (f a) -> f (Backwards * f a) Source

mapM :: Monad m => (a -> m b) -> Backwards * f a -> m (Backwards * f b) Source

sequence :: Monad m => Backwards * f (m a) -> m (Backwards * f a) Source

Eq1 f => Eq1 (Backwards * f)

Methods

liftEq :: (a -> b -> Bool) -> Backwards * f a -> Backwards * f b -> Bool Source

Ord1 f => Ord1 (Backwards * f)

Methods

liftCompare :: (a -> b -> Ordering) -> Backwards * f a -> Backwards * f b -> Ordering Source

Read1 f => Read1 (Backwards * f)

Methods

liftReadsPrec :: (Int -> ReadS a) -> ReadS [a] -> Int -> ReadS (Backwards * f a) Source

liftReadList :: (Int -> ReadS a) -> ReadS [a] -> ReadS [Backwards * f a] Source

Show1 f => Show1 (Backwards * f)

Methods

liftShowsPrec :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> Backwards * f a -> ShowS Source

liftShowList :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> [Backwards * f a] -> ShowS Source

Alternative f => Alternative (Backwards * f)

Try alternatives in the same order as f.

Methods

empty :: Backwards * f a Source

(<|>) :: Backwards * f a -> Backwards * f a -> Backwards * f a Source

some :: Backwards * f a -> Backwards * f [a] Source

many :: Backwards * f a -> Backwards * f [a] Source

(Eq1 f, Eq a) => Eq (Backwards * f a)

Methods

(==) :: Backwards * f a -> Backwards * f a -> Bool

(/=) :: Backwards * f a -> Backwards * f a -> Bool

(Ord1 f, Ord a) => Ord (Backwards * f a)

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)
(Show1 f, Show a) => Show (Backwards * f a)

Methods

showsPrec :: Int -> Backwards * f a -> ShowS Source

show :: Backwards * f a -> String Source

showList :: [Backwards * f a] -> ShowS Source

© The University of Glasgow and others
Licensed under a BSD-style license (see top of the page).
https://downloads.haskell.org/~ghc/8.0.1/docs/html/libraries/transformers-0.5.2.0/Control-Applicative-Backwards.html

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