Copyright	(c) Ross Paterson 2013, Edward Kmett 2014
License	BSD-style (see the file LICENSE)
Maintainer	ross@soi.city.ac.uk
Stability	experimental
Portability	portable
Safe Haskell	Safe-Inferred
Language	Haskell98

Data.Functor.Classes

Contents

Liftings of Prelude classes
Helper functions

Description

Prelude classes, lifted to unary type constructors.

Synopsis

Liftings of Prelude classes

class Eq1 f where

Lifting of the Eq class to unary type constructors.

Methods

eq1 :: Eq a => f a -> f a -> Bool

Instances

Eq1 []
Eq1 Maybe
Eq1 Identity
Eq a => Eq1 (Either a)
Eq a => Eq1 ((,) a)
Eq1 m => Eq1 (ListT m)
Eq1 f => Eq1 (Reverse f)
Eq1 f => Eq1 (Backwards f)
Eq1 f => Eq1 (Lift f)
Eq a => Eq1 (Constant a)
Eq1 m => Eq1 (MaybeT m)
Eq1 f => Eq1 (IdentityT f)
(Eq e, Eq1 m) => Eq1 (ErrorT e m)
(Eq w, Eq1 m) => Eq1 (WriterT w m)
(Eq w, Eq1 m) => Eq1 (WriterT w m)
(Functor f, Eq1 f, Eq1 g) => Eq1 (Compose f g)
(Eq1 f, Eq1 g) => Eq1 (Product f g)
(Eq1 f, Eq1 g) => Eq1 (Sum f g)
(Eq e, Eq1 m) => Eq1 (ExceptT e m)

class Eq1 f => Ord1 f where

Lifting of the Ord class to unary type constructors.

Methods

compare1 :: Ord a => f a -> f a -> Ordering

Instances

Ord1 []
Ord1 Maybe
Ord1 Identity
Ord a => Ord1 (Either a)
Ord a => Ord1 ((,) a)
Ord1 m => Ord1 (ListT m)
Ord1 f => Ord1 (Reverse f)
Ord1 f => Ord1 (Backwards f)
Ord1 f => Ord1 (Lift f)
Ord a => Ord1 (Constant a)
Ord1 m => Ord1 (MaybeT m)
Ord1 f => Ord1 (IdentityT f)
(Ord e, Ord1 m) => Ord1 (ErrorT e m)
(Ord w, Ord1 m) => Ord1 (WriterT w m)
(Ord w, Ord1 m) => Ord1 (WriterT w m)
(Functor f, Ord1 f, Ord1 g) => Ord1 (Compose f g)
(Ord1 f, Ord1 g) => Ord1 (Product f g)
(Ord1 f, Ord1 g) => Ord1 (Sum f g)
(Ord e, Ord1 m) => Ord1 (ExceptT e m)

class Read1 f where

Lifting of the Read class to unary type constructors.

Methods

readsPrec1 :: Read a => Int -> ReadS (f a)

Instances

Read1 []
Read1 Maybe
Read1 Identity
Read a => Read1 (Either a)
Read a => Read1 ((,) a)
Read1 m => Read1 (ListT m)
Read1 f => Read1 (Reverse f)
Read1 f => Read1 (Backwards f)
Read1 f => Read1 (Lift f)
Read a => Read1 (Constant a)
Read1 m => Read1 (MaybeT m)
Read1 f => Read1 (IdentityT f)
(Read e, Read1 m) => Read1 (ErrorT e m)
(Read w, Read1 m) => Read1 (WriterT w m)
(Read w, Read1 m) => Read1 (WriterT w m)
(Functor f, Read1 f, Read1 g) => Read1 (Compose f g)
(Read1 f, Read1 g) => Read1 (Product f g)
(Read1 f, Read1 g) => Read1 (Sum f g)
(Read e, Read1 m) => Read1 (ExceptT e m)

class Show1 f where

Lifting of the Show class to unary type constructors.

Methods

showsPrec1 :: Show a => Int -> f a -> ShowS

Instances

Show1 []
Show1 Maybe
Show1 Identity
Show a => Show1 (Either a)
Show a => Show1 ((,) a)
Show1 m => Show1 (ListT m)
Show1 f => Show1 (Reverse f)
Show1 f => Show1 (Backwards f)
Show1 f => Show1 (Lift f)
Show a => Show1 (Constant a)
Show1 m => Show1 (MaybeT m)
Show1 f => Show1 (IdentityT f)
(Show e, Show1 m) => Show1 (ErrorT e m)
(Show w, Show1 m) => Show1 (WriterT w m)
(Show w, Show1 m) => Show1 (WriterT w m)
(Functor f, Show1 f, Show1 g) => Show1 (Compose f g)
(Show1 f, Show1 g) => Show1 (Product f g)
(Show1 f, Show1 g) => Show1 (Sum f g)
(Show e, Show1 m) => Show1 (ExceptT e m)

Helper functions

readsData :: (String -> ReadS a) -> Int -> ReadS a

readsData p d is a parser for datatypes where each alternative begins with a data constructor. It parses the constructor and passes it to p. Parsers for various constructors can be constructed with readsUnary, readsUnary1 and readsBinary1, and combined with mappend from the Monoid class.

readsUnary :: Read a => String -> (a -> t) -> String -> ReadS t

readsUnary n c n' matches the name of a unary data constructor and then parses its argument using readsPrec.

readsUnary1 :: (Read1 f, Read a) => String -> (f a -> t) -> String -> ReadS t

readsUnary1 n c n' matches the name of a unary data constructor and then parses its argument using readsPrec1.

readsBinary1 :: (Read1 f, Read1 g, Read a) => String -> (f a -> g a -> t) -> String -> ReadS t

readsBinary1 n c n' matches the name of a binary data constructor and then parses its arguments using readsPrec1.

showsUnary :: Show a => String -> Int -> a -> ShowS

showsUnary n d x produces the string representation of a unary data constructor with name n and argument x, in precedence context d.

showsUnary1 :: (Show1 f, Show a) => String -> Int -> f a -> ShowS

showsUnary1 n d x produces the string representation of a unary data constructor with name n and argument x, in precedence context d.

showsBinary1 :: (Show1 f, Show1 g, Show a) => String -> Int -> f a -> g a -> ShowS

showsBinary1 n d x produces the string representation of a binary data constructor with name n and arguments x and y, in precedence context d.