base-4.20.0.0: Core data structures and operations
Copyright(c) The University of Glasgow 2001
LicenseBSD-style (see the file libraries/base/LICENSE)
Maintainerlibraries@haskell.org
Stabilitystable
Portabilityportable
Safe HaskellTrustworthy
LanguageHaskell2010

Prelude

Description

The Prelude: a standard module. The Prelude is imported by default into all Haskell modules unless either there is an explicit import statement for it, or the NoImplicitPrelude extension is enabled.

Synopsis

Standard types, classes and related functions

Basic data types

data Bool Source #

Constructors

False 
True 

Instances

Instances details
Bits Bool

Interpret Bool as 1-bit bit-field

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Bits

FiniteBits Bool

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Bits

Data Bool

Since: base-4.0.0.0

Instance details

Defined in GHC.Internal.Data.Data

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Bool -> c Bool Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Bool Source #

toConstr :: Bool -> Constr Source #

dataTypeOf :: Bool -> DataType Source #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Bool) Source #

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

gmapT :: (forall b. Data b => b -> b) -> Bool -> Bool Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Bool -> r Source #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Bool -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> Bool -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Bool -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Bool -> m Bool Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Bool -> m Bool Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Bool -> m Bool Source #

Bounded Bool

Since: base-2.1

Instance details

Defined in GHC.Internal.Enum

Enum Bool

Since: base-2.1

Instance details

Defined in GHC.Internal.Enum

Storable Bool

Since: base-2.1

Instance details

Defined in GHC.Internal.Foreign.Storable

Generic Bool 
Instance details

Defined in GHC.Internal.Generics

Associated Types

type Rep Bool

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep Bool = D1 ('MetaData "Bool" "GHC.Types" "ghc-prim" 'False) (C1 ('MetaCons "False" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "True" 'PrefixI 'False) (U1 :: Type -> Type))

Methods

from :: Bool -> Rep Bool x Source #

to :: Rep Bool x -> Bool Source #

SingKind Bool

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Associated Types

type DemoteRep Bool 
Instance details

Defined in GHC.Internal.Generics

type DemoteRep Bool = Bool

Methods

fromSing :: forall (a :: Bool). Sing a -> DemoteRep Bool

Ix Bool

Since: base-2.1

Instance details

Defined in GHC.Internal.Ix

Read Bool

Since: base-2.1

Instance details

Defined in GHC.Internal.Read

Show Bool

Since: base-2.1

Instance details

Defined in GHC.Internal.Show

Eq Bool 
Instance details

Defined in GHC.Classes

Methods

(==) :: Bool -> Bool -> Bool Source #

(/=) :: Bool -> Bool -> Bool Source #

Ord Bool 
Instance details

Defined in GHC.Classes

SingI 'False

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

sing :: Sing 'False

SingI 'True

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

sing :: Sing 'True

type DemoteRep Bool 
Instance details

Defined in GHC.Internal.Generics

type DemoteRep Bool = Bool
type Rep Bool

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep Bool = D1 ('MetaData "Bool" "GHC.Types" "ghc-prim" 'False) (C1 ('MetaCons "False" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "True" 'PrefixI 'False) (U1 :: Type -> Type))
data Sing (a :: Bool) 
Instance details

Defined in GHC.Internal.Generics

data Sing (a :: Bool) where

(&&) :: Bool -> Bool -> Bool infixr 3 Source #

Boolean "and", lazy in the second argument

(||) :: Bool -> Bool -> Bool infixr 2 Source #

Boolean "or", lazy in the second argument

not :: Bool -> Bool Source #

Boolean "not"

otherwise :: Bool Source #

otherwise is defined as the value True. It helps to make guards more readable. eg.

 f x | x < 0     = ...
     | otherwise = ...

data Maybe a Source #

The Maybe type encapsulates an optional value. A value of type Maybe a either contains a value of type a (represented as Just a), or it is empty (represented as Nothing). Using Maybe is a good way to deal with errors or exceptional cases without resorting to drastic measures such as error.

The Maybe type is also a monad. It is a simple kind of error monad, where all errors are represented by Nothing. A richer error monad can be built using the Either type.

Constructors

Nothing 
Just a 

Instances

Instances details
MonadZip Maybe Source #

Since: base-4.8.0.0

Instance details

Defined in Control.Monad.Zip

Methods

mzip :: Maybe a -> Maybe b -> Maybe (a, b) Source #

mzipWith :: (a -> b -> c) -> Maybe a -> Maybe b -> Maybe c Source #

munzip :: Maybe (a, b) -> (Maybe a, Maybe b) Source #

Eq1 Maybe Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftEq :: (a -> b -> Bool) -> Maybe a -> Maybe b -> Bool Source #

Ord1 Maybe Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftCompare :: (a -> b -> Ordering) -> Maybe a -> Maybe b -> Ordering Source #

Read1 Maybe Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Show1 Maybe Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

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

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

Alternative Maybe

Picks the leftmost Just value, or, alternatively, Nothing.

Since: base-2.1

Instance details

Defined in GHC.Internal.Base

Methods

empty :: Maybe a Source #

(<|>) :: Maybe a -> Maybe a -> Maybe a Source #

some :: Maybe a -> Maybe [a] Source #

many :: Maybe a -> Maybe [a] Source #

Applicative Maybe

Since: base-2.1

Instance details

Defined in GHC.Internal.Base

Methods

pure :: a -> Maybe a Source #

(<*>) :: Maybe (a -> b) -> Maybe a -> Maybe b Source #

liftA2 :: (a -> b -> c) -> Maybe a -> Maybe b -> Maybe c Source #

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

(<*) :: Maybe a -> Maybe b -> Maybe a Source #

Functor Maybe

Since: base-2.1

Instance details

Defined in GHC.Internal.Base

Methods

fmap :: (a -> b) -> Maybe a -> Maybe b Source #

(<$) :: a -> Maybe b -> Maybe a Source #

Monad Maybe

Since: base-2.1

Instance details

Defined in GHC.Internal.Base

Methods

(>>=) :: Maybe a -> (a -> Maybe b) -> Maybe b Source #

(>>) :: Maybe a -> Maybe b -> Maybe b Source #

return :: a -> Maybe a Source #

MonadPlus Maybe

Picks the leftmost Just value, or, alternatively, Nothing.

Since: base-2.1

Instance details

Defined in GHC.Internal.Base

Methods

mzero :: Maybe a Source #

mplus :: Maybe a -> Maybe a -> Maybe a Source #

MonadFail Maybe

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Control.Monad.Fail

Methods

fail :: String -> Maybe a Source #

MonadFix Maybe

Since: base-2.1

Instance details

Defined in GHC.Internal.Control.Monad.Fix

Methods

mfix :: (a -> Maybe a) -> Maybe a Source #

Foldable Maybe

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Foldable

Methods

fold :: Monoid m => Maybe m -> m Source #

foldMap :: Monoid m => (a -> m) -> Maybe a -> m Source #

foldMap' :: Monoid m => (a -> m) -> Maybe a -> m Source #

foldr :: (a -> b -> b) -> b -> Maybe a -> b Source #

foldr' :: (a -> b -> b) -> b -> Maybe a -> b Source #

foldl :: (b -> a -> b) -> b -> Maybe a -> b Source #

foldl' :: (b -> a -> b) -> b -> Maybe a -> b Source #

foldr1 :: (a -> a -> a) -> Maybe a -> a Source #

foldl1 :: (a -> a -> a) -> Maybe a -> a Source #

toList :: Maybe a -> [a] Source #

null :: Maybe a -> Bool Source #

length :: Maybe a -> Int Source #

elem :: Eq a => a -> Maybe a -> Bool Source #

maximum :: Ord a => Maybe a -> a Source #

minimum :: Ord a => Maybe a -> a Source #

sum :: Num a => Maybe a -> a Source #

product :: Num a => Maybe a -> a Source #

Traversable Maybe

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Traversable

Methods

traverse :: Applicative f => (a -> f b) -> Maybe a -> f (Maybe b) Source #

sequenceA :: Applicative f => Maybe (f a) -> f (Maybe a) Source #

mapM :: Monad m => (a -> m b) -> Maybe a -> m (Maybe b) Source #

sequence :: Monad m => Maybe (m a) -> m (Maybe a) Source #

Generic1 Maybe 
Instance details

Defined in GHC.Internal.Generics

Associated Types

type Rep1 Maybe

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep1 Maybe = D1 ('MetaData "Maybe" "GHC.Internal.Maybe" "ghc-internal" 'False) (C1 ('MetaCons "Nothing" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "Just" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) Par1))

Methods

from1 :: Maybe a -> Rep1 Maybe a Source #

to1 :: Rep1 Maybe a -> Maybe a Source #

Semigroup a => Monoid (Maybe a)

Lift a semigroup into Maybe forming a Monoid according to http://en.wikipedia.org/wiki/Monoid: "Any semigroup S may be turned into a monoid simply by adjoining an element e not in S and defining e*e = e and e*s = s = s*e for all s ∈ S."

Since 4.11.0: constraint on inner a value generalised from Monoid to Semigroup.

Since: base-2.1

Instance details

Defined in GHC.Internal.Base

Methods

mempty :: Maybe a Source #

mappend :: Maybe a -> Maybe a -> Maybe a Source #

mconcat :: [Maybe a] -> Maybe a Source #

Semigroup a => Semigroup (Maybe a)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Base

Methods

(<>) :: Maybe a -> Maybe a -> Maybe a Source #

sconcat :: NonEmpty (Maybe a) -> Maybe a Source #

stimes :: Integral b => b -> Maybe a -> Maybe a Source #

Data a => Data (Maybe a)

Since: base-4.0.0.0

Instance details

Defined in GHC.Internal.Data.Data

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Maybe a -> c (Maybe a) Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Maybe a) Source #

toConstr :: Maybe a -> Constr Source #

dataTypeOf :: Maybe a -> DataType Source #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Maybe a)) Source #

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

gmapT :: (forall b. Data b => b -> b) -> Maybe a -> Maybe a Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Maybe a -> r Source #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Maybe a -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> Maybe a -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Maybe a -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Maybe a -> m (Maybe a) Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Maybe a -> m (Maybe a) Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Maybe a -> m (Maybe a) Source #

Generic (Maybe a) 
Instance details

Defined in GHC.Internal.Generics

Associated Types

type Rep (Maybe a)

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep (Maybe a) = D1 ('MetaData "Maybe" "GHC.Internal.Maybe" "ghc-internal" 'False) (C1 ('MetaCons "Nothing" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "Just" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a)))

Methods

from :: Maybe a -> Rep (Maybe a) x Source #

to :: Rep (Maybe a) x -> Maybe a Source #

SingKind a => SingKind (Maybe a)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Associated Types

type DemoteRep (Maybe a) 
Instance details

Defined in GHC.Internal.Generics

type DemoteRep (Maybe a) = Maybe (DemoteRep a)

Methods

fromSing :: forall (a0 :: Maybe a). Sing a0 -> DemoteRep (Maybe a)

Read a => Read (Maybe a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Read

Show a => Show (Maybe a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Show

Eq a => Eq (Maybe a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Maybe

Methods

(==) :: Maybe a -> Maybe a -> Bool Source #

(/=) :: Maybe a -> Maybe a -> Bool Source #

Ord a => Ord (Maybe a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Maybe

Methods

compare :: Maybe a -> Maybe a -> Ordering Source #

(<) :: Maybe a -> Maybe a -> Bool Source #

(<=) :: Maybe a -> Maybe a -> Bool Source #

(>) :: Maybe a -> Maybe a -> Bool Source #

(>=) :: Maybe a -> Maybe a -> Bool Source #

max :: Maybe a -> Maybe a -> Maybe a Source #

min :: Maybe a -> Maybe a -> Maybe a Source #

SingI ('Nothing :: Maybe a)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

sing :: Sing ('Nothing :: Maybe a)

SingI a2 => SingI ('Just a2 :: Maybe a1)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

sing :: Sing ('Just a2)

type Rep1 Maybe

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep1 Maybe = D1 ('MetaData "Maybe" "GHC.Internal.Maybe" "ghc-internal" 'False) (C1 ('MetaCons "Nothing" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "Just" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) Par1))
type DemoteRep (Maybe a) 
Instance details

Defined in GHC.Internal.Generics

type DemoteRep (Maybe a) = Maybe (DemoteRep a)
type Rep (Maybe a)

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep (Maybe a) = D1 ('MetaData "Maybe" "GHC.Internal.Maybe" "ghc-internal" 'False) (C1 ('MetaCons "Nothing" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "Just" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a)))
data Sing (b :: Maybe a) 
Instance details

Defined in GHC.Internal.Generics

data Sing (b :: Maybe a) where

maybe :: b -> (a -> b) -> Maybe a -> b Source #

The maybe function takes a default value, a function, and a Maybe value. If the Maybe value is Nothing, the function returns the default value. Otherwise, it applies the function to the value inside the Just and returns the result.

Examples

Expand

Basic usage:

>>> maybe False odd (Just 3)
True
>>> maybe False odd Nothing
False

Read an integer from a string using readMaybe. If we succeed, return twice the integer; that is, apply (*2) to it. If instead we fail to parse an integer, return 0 by default:

>>> import GHC.Internal.Text.Read ( readMaybe )
>>> maybe 0 (*2) (readMaybe "5")
10
>>> maybe 0 (*2) (readMaybe "")
0

Apply show to a Maybe Int. If we have Just n, we want to show the underlying Int n. But if we have Nothing, we return the empty string instead of (for example) "Nothing":

>>> maybe "" show (Just 5)
"5"
>>> maybe "" show Nothing
""

data Either a b Source #

The Either type represents values with two possibilities: a value of type Either a b is either Left a or Right b.

The Either type is sometimes used to represent a value which is either correct or an error; by convention, the Left constructor is used to hold an error value and the Right constructor is used to hold a correct value (mnemonic: "right" also means "correct").

Examples

Expand

The type Either String Int is the type of values which can be either a String or an Int. The Left constructor can be used only on Strings, and the Right constructor can be used only on Ints:

>>> let s = Left "foo" :: Either String Int
>>> s
Left "foo"
>>> let n = Right 3 :: Either String Int
>>> n
Right 3
>>> :type s
s :: Either String Int
>>> :type n
n :: Either String Int

The fmap from our Functor instance will ignore Left values, but will apply the supplied function to values contained in a Right:

>>> let s = Left "foo" :: Either String Int
>>> let n = Right 3 :: Either String Int
>>> fmap (*2) s
Left "foo"
>>> fmap (*2) n
Right 6

The Monad instance for Either allows us to chain together multiple actions which may fail, and fail overall if any of the individual steps failed. First we'll write a function that can either parse an Int from a Char, or fail.

>>> import Data.Char ( digitToInt, isDigit )
>>> :{
    let parseEither :: Char -> Either String Int
        parseEither c
          | isDigit c = Right (digitToInt c)
          | otherwise = Left "parse error"
>>> :}

The following should work, since both '1' and '2' can be parsed as Ints.

>>> :{
    let parseMultiple :: Either String Int
        parseMultiple = do
          x <- parseEither '1'
          y <- parseEither '2'
          return (x + y)
>>> :}
>>> parseMultiple
Right 3

But the following should fail overall, since the first operation where we attempt to parse 'm' as an Int will fail:

>>> :{
    let parseMultiple :: Either String Int
        parseMultiple = do
          x <- parseEither 'm'
          y <- parseEither '2'
          return (x + y)
>>> :}
>>> parseMultiple
Left "parse error"

Constructors

Left a 
Right b 

Instances

Instances details
Bifoldable Either Source #

Since: base-4.10.0.0

Instance details

Defined in Data.Bifoldable

Methods

bifold :: Monoid m => Either m m -> m Source #

bifoldMap :: Monoid m => (a -> m) -> (b -> m) -> Either a b -> m Source #

bifoldr :: (a -> c -> c) -> (b -> c -> c) -> c -> Either a b -> c Source #

bifoldl :: (c -> a -> c) -> (c -> b -> c) -> c -> Either a b -> c Source #

Bifoldable1 Either Source # 
Instance details

Defined in Data.Bifoldable1

Methods

bifold1 :: Semigroup m => Either m m -> m Source #

bifoldMap1 :: Semigroup m => (a -> m) -> (b -> m) -> Either a b -> m Source #

Bifunctor Either Source #

Since: base-4.8.0.0

Instance details

Defined in Data.Bifunctor

Methods

bimap :: (a -> b) -> (c -> d) -> Either a c -> Either b d Source #

first :: (a -> b) -> Either a c -> Either b c Source #

second :: (b -> c) -> Either a b -> Either a c Source #

Bitraversable Either Source #

Since: base-4.10.0.0

Instance details

Defined in Data.Bitraversable

Methods

bitraverse :: Applicative f => (a -> f c) -> (b -> f d) -> Either a b -> f (Either c d) Source #

Eq2 Either Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftEq2 :: (a -> b -> Bool) -> (c -> d -> Bool) -> Either a c -> Either b d -> Bool Source #

Ord2 Either Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftCompare2 :: (a -> b -> Ordering) -> (c -> d -> Ordering) -> Either a c -> Either b d -> Ordering Source #

Read2 Either Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftReadsPrec2 :: (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> Int -> ReadS (Either a b) Source #

liftReadList2 :: (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> ReadS [Either a b] Source #

liftReadPrec2 :: ReadPrec a -> ReadPrec [a] -> ReadPrec b -> ReadPrec [b] -> ReadPrec (Either a b) Source #

liftReadListPrec2 :: ReadPrec a -> ReadPrec [a] -> ReadPrec b -> ReadPrec [b] -> ReadPrec [Either a b] Source #

Show2 Either Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftShowsPrec2 :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> (Int -> b -> ShowS) -> ([b] -> ShowS) -> Int -> Either a b -> ShowS Source #

liftShowList2 :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> (Int -> b -> ShowS) -> ([b] -> ShowS) -> [Either a b] -> ShowS Source #

Generic1 (Either a :: Type -> Type) 
Instance details

Defined in GHC.Internal.Generics

Associated Types

type Rep1 (Either a :: Type -> Type)

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep1 (Either a :: Type -> Type) = D1 ('MetaData "Either" "GHC.Internal.Data.Either" "ghc-internal" 'False) (C1 ('MetaCons "Left" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a)) :+: C1 ('MetaCons "Right" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) Par1))

Methods

from1 :: Either a a0 -> Rep1 (Either a) a0 Source #

to1 :: Rep1 (Either a) a0 -> Either a a0 Source #

Eq a => Eq1 (Either a) Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftEq :: (a0 -> b -> Bool) -> Either a a0 -> Either a b -> Bool Source #

Ord a => Ord1 (Either a) Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftCompare :: (a0 -> b -> Ordering) -> Either a a0 -> Either a b -> Ordering Source #

Read a => Read1 (Either a) Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftReadsPrec :: (Int -> ReadS a0) -> ReadS [a0] -> Int -> ReadS (Either a a0) Source #

liftReadList :: (Int -> ReadS a0) -> ReadS [a0] -> ReadS [Either a a0] Source #

liftReadPrec :: ReadPrec a0 -> ReadPrec [a0] -> ReadPrec (Either a a0) Source #

liftReadListPrec :: ReadPrec a0 -> ReadPrec [a0] -> ReadPrec [Either a a0] Source #

Show a => Show1 (Either a) Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftShowsPrec :: (Int -> a0 -> ShowS) -> ([a0] -> ShowS) -> Int -> Either a a0 -> ShowS Source #

liftShowList :: (Int -> a0 -> ShowS) -> ([a0] -> ShowS) -> [Either a a0] -> ShowS Source #

Applicative (Either e)

Since: base-3.0

Instance details

Defined in GHC.Internal.Data.Either

Methods

pure :: a -> Either e a Source #

(<*>) :: Either e (a -> b) -> Either e a -> Either e b Source #

liftA2 :: (a -> b -> c) -> Either e a -> Either e b -> Either e c Source #

(*>) :: Either e a -> Either e b -> Either e b Source #

(<*) :: Either e a -> Either e b -> Either e a Source #

Functor (Either a)

Since: base-3.0

Instance details

Defined in GHC.Internal.Data.Either

Methods

fmap :: (a0 -> b) -> Either a a0 -> Either a b Source #

(<$) :: a0 -> Either a b -> Either a a0 Source #

Monad (Either e)

Since: base-4.4.0.0

Instance details

Defined in GHC.Internal.Data.Either

Methods

(>>=) :: Either e a -> (a -> Either e b) -> Either e b Source #

(>>) :: Either e a -> Either e b -> Either e b Source #

return :: a -> Either e a Source #

MonadFix (Either e)

Since: base-4.3.0.0

Instance details

Defined in GHC.Internal.Control.Monad.Fix

Methods

mfix :: (a -> Either e a) -> Either e a Source #

Foldable (Either a)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Foldable

Methods

fold :: Monoid m => Either a m -> m Source #

foldMap :: Monoid m => (a0 -> m) -> Either a a0 -> m Source #

foldMap' :: Monoid m => (a0 -> m) -> Either a a0 -> m Source #

foldr :: (a0 -> b -> b) -> b -> Either a a0 -> b Source #

foldr' :: (a0 -> b -> b) -> b -> Either a a0 -> b Source #

foldl :: (b -> a0 -> b) -> b -> Either a a0 -> b Source #

foldl' :: (b -> a0 -> b) -> b -> Either a a0 -> b Source #

foldr1 :: (a0 -> a0 -> a0) -> Either a a0 -> a0 Source #

foldl1 :: (a0 -> a0 -> a0) -> Either a a0 -> a0 Source #

toList :: Either a a0 -> [a0] Source #

null :: Either a a0 -> Bool Source #

length :: Either a a0 -> Int Source #

elem :: Eq a0 => a0 -> Either a a0 -> Bool Source #

maximum :: Ord a0 => Either a a0 -> a0 Source #

minimum :: Ord a0 => Either a a0 -> a0 Source #

sum :: Num a0 => Either a a0 -> a0 Source #

product :: Num a0 => Either a a0 -> a0 Source #

Traversable (Either a)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Traversable

Methods

traverse :: Applicative f => (a0 -> f b) -> Either a a0 -> f (Either a b) Source #

sequenceA :: Applicative f => Either a (f a0) -> f (Either a a0) Source #

mapM :: Monad m => (a0 -> m b) -> Either a a0 -> m (Either a b) Source #

sequence :: Monad m => Either a (m a0) -> m (Either a a0) Source #

Semigroup (Either a b)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Data.Either

Methods

(<>) :: Either a b -> Either a b -> Either a b Source #

sconcat :: NonEmpty (Either a b) -> Either a b Source #

stimes :: Integral b0 => b0 -> Either a b -> Either a b Source #

(Data a, Data b) => Data (Either a b)

Since: base-4.0.0.0

Instance details

Defined in GHC.Internal.Data.Data

Methods

gfoldl :: (forall d b0. Data d => c (d -> b0) -> d -> c b0) -> (forall g. g -> c g) -> Either a b -> c (Either a b) Source #

gunfold :: (forall b0 r. Data b0 => c (b0 -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Either a b) Source #

toConstr :: Either a b -> Constr Source #

dataTypeOf :: Either a b -> DataType Source #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Either a b)) Source #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (Either a b)) Source #

gmapT :: (forall b0. Data b0 => b0 -> b0) -> Either a b -> Either a b Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Either a b -> r Source #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Either a b -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> Either a b -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Either a b -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Either a b -> m (Either a b) Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Either a b -> m (Either a b) Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Either a b -> m (Either a b) Source #

Generic (Either a b) 
Instance details

Defined in GHC.Internal.Generics

Associated Types

type Rep (Either a b)

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep (Either a b) = D1 ('MetaData "Either" "GHC.Internal.Data.Either" "ghc-internal" 'False) (C1 ('MetaCons "Left" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a)) :+: C1 ('MetaCons "Right" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 b)))

Methods

from :: Either a b -> Rep (Either a b) x Source #

to :: Rep (Either a b) x -> Either a b Source #

(Read a, Read b) => Read (Either a b)

Since: base-3.0

Instance details

Defined in GHC.Internal.Data.Either

(Show a, Show b) => Show (Either a b)

Since: base-3.0

Instance details

Defined in GHC.Internal.Data.Either

Methods

showsPrec :: Int -> Either a b -> ShowS Source #

show :: Either a b -> String Source #

showList :: [Either a b] -> ShowS Source #

(Eq a, Eq b) => Eq (Either a b)

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Either

Methods

(==) :: Either a b -> Either a b -> Bool Source #

(/=) :: Either a b -> Either a b -> Bool Source #

(Ord a, Ord b) => Ord (Either a b)

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Either

Methods

compare :: Either a b -> Either a b -> Ordering Source #

(<) :: Either a b -> Either a b -> Bool Source #

(<=) :: Either a b -> Either a b -> Bool Source #

(>) :: Either a b -> Either a b -> Bool Source #

(>=) :: Either a b -> Either a b -> Bool Source #

max :: Either a b -> Either a b -> Either a b Source #

min :: Either a b -> Either a b -> Either a b Source #

type Rep1 (Either a :: Type -> Type)

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep1 (Either a :: Type -> Type) = D1 ('MetaData "Either" "GHC.Internal.Data.Either" "ghc-internal" 'False) (C1 ('MetaCons "Left" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a)) :+: C1 ('MetaCons "Right" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) Par1))
type Rep (Either a b)

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep (Either a b) = D1 ('MetaData "Either" "GHC.Internal.Data.Either" "ghc-internal" 'False) (C1 ('MetaCons "Left" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a)) :+: C1 ('MetaCons "Right" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 b)))

either :: (a -> c) -> (b -> c) -> Either a b -> c Source #

Case analysis for the Either type. If the value is Left a, apply the first function to a; if it is Right b, apply the second function to b.

Examples

Expand

We create two values of type Either String Int, one using the Left constructor and another using the Right constructor. Then we apply "either" the length function (if we have a String) or the "times-two" function (if we have an Int):

>>> let s = Left "foo" :: Either String Int
>>> let n = Right 3 :: Either String Int
>>> either length (*2) s
3
>>> either length (*2) n
6

data Ordering Source #

Constructors

LT 
EQ 
GT 

Instances

Instances details
Monoid Ordering

Since: base-2.1

Instance details

Defined in GHC.Internal.Base

Semigroup Ordering

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Base

Data Ordering

Since: base-4.0.0.0

Instance details

Defined in GHC.Internal.Data.Data

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Ordering -> c Ordering Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Ordering Source #

toConstr :: Ordering -> Constr Source #

dataTypeOf :: Ordering -> DataType Source #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Ordering) Source #

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

gmapT :: (forall b. Data b => b -> b) -> Ordering -> Ordering Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Ordering -> r Source #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Ordering -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> Ordering -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Ordering -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Ordering -> m Ordering Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Ordering -> m Ordering Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Ordering -> m Ordering Source #

Bounded Ordering

Since: base-2.1

Instance details

Defined in GHC.Internal.Enum

Enum Ordering

Since: base-2.1

Instance details

Defined in GHC.Internal.Enum

Generic Ordering 
Instance details

Defined in GHC.Internal.Generics

Associated Types

type Rep Ordering

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep Ordering = D1 ('MetaData "Ordering" "GHC.Types" "ghc-prim" 'False) (C1 ('MetaCons "LT" 'PrefixI 'False) (U1 :: Type -> Type) :+: (C1 ('MetaCons "EQ" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "GT" 'PrefixI 'False) (U1 :: Type -> Type)))
Ix Ordering

Since: base-2.1

Instance details

Defined in GHC.Internal.Ix

Read Ordering

Since: base-2.1

Instance details

Defined in GHC.Internal.Read

Show Ordering

Since: base-2.1

Instance details

Defined in GHC.Internal.Show

Eq Ordering 
Instance details

Defined in GHC.Classes

Ord Ordering 
Instance details

Defined in GHC.Classes

type Rep Ordering

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep Ordering = D1 ('MetaData "Ordering" "GHC.Types" "ghc-prim" 'False) (C1 ('MetaCons "LT" 'PrefixI 'False) (U1 :: Type -> Type) :+: (C1 ('MetaCons "EQ" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "GT" 'PrefixI 'False) (U1 :: Type -> Type)))

data Char Source #

The character type Char represents Unicode codespace and its elements are code points as in definitions D9 and D10 of the Unicode Standard.

Character literals in Haskell are single-quoted: 'Q', 'Я' or 'Ω'. To represent a single quote itself use '\'', and to represent a backslash use '\\'. The full grammar can be found in the section 2.6 of the Haskell 2010 Language Report.

To specify a character by its code point one can use decimal, hexadecimal or octal notation: '\65', '\x41' and '\o101' are all alternative forms of 'A'. The largest code point is '\x10ffff'.

There is a special escape syntax for ASCII control characters:

EscapeAlternativesMeaning
'\NUL''\0'null character
'\SOH''\1'start of heading
'\STX''\2'start of text
'\ETX''\3'end of text
'\EOT''\4'end of transmission
'\ENQ''\5'enquiry
'\ACK''\6'acknowledge
'\BEL''\7', '\a'bell (alert)
'\BS''\8', '\b'backspace
'\HT''\9', '\t'horizontal tab
'\LF''\10', '\n'line feed (new line)
'\VT''\11', '\v'vertical tab
'\FF''\12', '\f'form feed
'\CR''\13', '\r'carriage return
'\SO''\14'shift out
'\SI''\15'shift in
'\DLE''\16'data link escape
'\DC1''\17'device control 1
'\DC2''\18'device control 2
'\DC3''\19'device control 3
'\DC4''\20'device control 4
'\NAK''\21'negative acknowledge
'\SYN''\22'synchronous idle
'\ETB''\23'end of transmission block
'\CAN''\24'cancel
'\EM''\25'end of medium
'\SUB''\26'substitute
'\ESC''\27'escape
'\FS''\28'file separator
'\GS''\29'group separator
'\RS''\30'record separator
'\US''\31'unit separator
'\SP''\32', ' 'space
'\DEL''\127'delete

Data.Char provides utilities to work with Char.

Instances

Instances details
IsChar Char Source #

Since: base-2.1

Instance details

Defined in Text.Printf

PrintfArg Char Source #

Since: base-2.1

Instance details

Defined in Text.Printf

Data Char

Since: base-4.0.0.0

Instance details

Defined in GHC.Internal.Data.Data

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Char -> c Char Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Char Source #

toConstr :: Char -> Constr Source #

dataTypeOf :: Char -> DataType Source #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Char) Source #

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

gmapT :: (forall b. Data b => b -> b) -> Char -> Char Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Char -> r Source #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Char -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> Char -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Char -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Char -> m Char Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Char -> m Char Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Char -> m Char Source #

Bounded Char

Since: base-2.1

Instance details

Defined in GHC.Internal.Enum

Enum Char

Since: base-2.1

Instance details

Defined in GHC.Internal.Enum

Storable Char

Since: base-2.1

Instance details

Defined in GHC.Internal.Foreign.Storable

Ix Char

Since: base-2.1

Instance details

Defined in GHC.Internal.Ix

Read Char

Since: base-2.1

Instance details

Defined in GHC.Internal.Read

Show Char

Since: base-2.1

Instance details

Defined in GHC.Internal.Show

Eq Char 
Instance details

Defined in GHC.Classes

Methods

(==) :: Char -> Char -> Bool Source #

(/=) :: Char -> Char -> Bool Source #

Ord Char 
Instance details

Defined in GHC.Classes

TestCoercion SChar

Since: base-4.18.0.0

Instance details

Defined in GHC.Internal.TypeLits

Methods

testCoercion :: forall (a :: Char) (b :: Char). SChar a -> SChar b -> Maybe (Coercion a b) Source #

TestEquality SChar

Since: base-4.18.0.0

Instance details

Defined in GHC.Internal.TypeLits

Methods

testEquality :: forall (a :: Char) (b :: Char). SChar a -> SChar b -> Maybe (a :~: b) Source #

Generic1 (URec Char :: k -> Type) 
Instance details

Defined in GHC.Internal.Generics

Associated Types

type Rep1 (URec Char :: k -> Type)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep1 (URec Char :: k -> Type) = D1 ('MetaData "URec" "GHC.Internal.Generics" "ghc-internal" 'False) (C1 ('MetaCons "UChar" 'PrefixI 'True) (S1 ('MetaSel ('Just "uChar#") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (UChar :: k -> Type)))

Methods

from1 :: forall (a :: k). URec Char a -> Rep1 (URec Char :: k -> Type) a Source #

to1 :: forall (a :: k). Rep1 (URec Char :: k -> Type) a -> URec Char a Source #

Foldable (UChar :: Type -> Type)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Data.Foldable

Methods

fold :: Monoid m => UChar m -> m Source #

foldMap :: Monoid m => (a -> m) -> UChar a -> m Source #

foldMap' :: Monoid m => (a -> m) -> UChar a -> m Source #

foldr :: (a -> b -> b) -> b -> UChar a -> b Source #

foldr' :: (a -> b -> b) -> b -> UChar a -> b Source #

foldl :: (b -> a -> b) -> b -> UChar a -> b Source #

foldl' :: (b -> a -> b) -> b -> UChar a -> b Source #

foldr1 :: (a -> a -> a) -> UChar a -> a Source #

foldl1 :: (a -> a -> a) -> UChar a -> a Source #

toList :: UChar a -> [a] Source #

null :: UChar a -> Bool Source #

length :: UChar a -> Int Source #

elem :: Eq a => a -> UChar a -> Bool Source #

maximum :: Ord a => UChar a -> a Source #

minimum :: Ord a => UChar a -> a Source #

sum :: Num a => UChar a -> a Source #

product :: Num a => UChar a -> a Source #

Traversable (UChar :: Type -> Type)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Data.Traversable

Methods

traverse :: Applicative f => (a -> f b) -> UChar a -> f (UChar b) Source #

sequenceA :: Applicative f => UChar (f a) -> f (UChar a) Source #

mapM :: Monad m => (a -> m b) -> UChar a -> m (UChar b) Source #

sequence :: Monad m => UChar (m a) -> m (UChar a) Source #

Functor (URec Char :: Type -> Type)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

fmap :: (a -> b) -> URec Char a -> URec Char b Source #

(<$) :: a -> URec Char b -> URec Char a Source #

Generic (URec Char p) 
Instance details

Defined in GHC.Internal.Generics

Associated Types

type Rep (URec Char p)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep (URec Char p) = D1 ('MetaData "URec" "GHC.Internal.Generics" "ghc-internal" 'False) (C1 ('MetaCons "UChar" 'PrefixI 'True) (S1 ('MetaSel ('Just "uChar#") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (UChar :: Type -> Type)))

Methods

from :: URec Char p -> Rep (URec Char p) x Source #

to :: Rep (URec Char p) x -> URec Char p Source #

Show (URec Char p)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Eq (URec Char p)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: URec Char p -> URec Char p -> Bool Source #

(/=) :: URec Char p -> URec Char p -> Bool Source #

Ord (URec Char p)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

compare :: URec Char p -> URec Char p -> Ordering Source #

(<) :: URec Char p -> URec Char p -> Bool Source #

(<=) :: URec Char p -> URec Char p -> Bool Source #

(>) :: URec Char p -> URec Char p -> Bool Source #

(>=) :: URec Char p -> URec Char p -> Bool Source #

max :: URec Char p -> URec Char p -> URec Char p Source #

min :: URec Char p -> URec Char p -> URec Char p Source #

data URec Char (p :: k)

Used for marking occurrences of Char#

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

data URec Char (p :: k) = UChar {}
type Compare (a :: Char) (b :: Char) 
Instance details

Defined in GHC.Internal.Data.Type.Ord

type Compare (a :: Char) (b :: Char) = CmpChar a b
type Rep1 (URec Char :: k -> Type)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep1 (URec Char :: k -> Type) = D1 ('MetaData "URec" "GHC.Internal.Generics" "ghc-internal" 'False) (C1 ('MetaCons "UChar" 'PrefixI 'True) (S1 ('MetaSel ('Just "uChar#") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (UChar :: k -> Type)))
type Rep (URec Char p)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep (URec Char p) = D1 ('MetaData "URec" "GHC.Internal.Generics" "ghc-internal" 'False) (C1 ('MetaCons "UChar" 'PrefixI 'True) (S1 ('MetaSel ('Just "uChar#") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (UChar :: Type -> Type)))

type String = [Char] Source #

String is an alias for a list of characters.

String constants in Haskell are values of type String. That means if you write a string literal like "hello world", it will have the type [Char], which is the same as String.

Note: You can ask the compiler to automatically infer different types with the -XOverloadedStrings language extension, for example "hello world" :: Text. See IsString for more information.

Because String is just a list of characters, you can use normal list functions to do basic string manipulation. See Data.List for operations on lists.

Performance considerations

Expand

[Char] is a relatively memory-inefficient type. It is a linked list of boxed word-size characters, internally it looks something like:

╭─────┬───┬──╮  ╭─────┬───┬──╮  ╭─────┬───┬──╮  ╭────╮
│ (:) │   │ ─┼─>│ (:) │   │ ─┼─>│ (:) │   │ ─┼─>│ [] │
╰─────┴─┼─┴──╯  ╰─────┴─┼─┴──╯  ╰─────┴─┼─┴──╯  ╰────╯
        v               v               v
       'a'             'b'             'c'

The String "abc" will use 5*3+1 = 16 (in general 5n+1) words of space in memory.

Furthermore, operations like (++) (string concatenation) are O(n) (in the left argument).

For historical reasons, the base library uses String in a lot of places for the conceptual simplicity, but library code dealing with user-data should use the text package for Unicode text, or the the bytestring package for binary data.

Tuples

fst :: (a, b) -> a Source #

Extract the first component of a pair.

snd :: (a, b) -> b Source #

Extract the second component of a pair.

curry :: ((a, b) -> c) -> a -> b -> c Source #

Convert an uncurried function to a curried function.

Examples

Expand
>>> curry fst 1 2
1

uncurry :: (a -> b -> c) -> (a, b) -> c Source #

uncurry converts a curried function to a function on pairs.

Examples

Expand
>>> uncurry (+) (1,2)
3
>>> uncurry ($) (show, 1)
"1"
>>> map (uncurry max) [(1,2), (3,4), (6,8)]
[2,4,8]

Basic type classes

class Eq a where Source #

The Eq class defines equality (==) and inequality (/=). All the basic datatypes exported by the Prelude are instances of Eq, and Eq may be derived for any datatype whose constituents are also instances of Eq.

The Haskell Report defines no laws for Eq. However, instances are encouraged to follow these properties:

Reflexivity
x == x = True
Symmetry
x == y = y == x
Transitivity
if x == y && y == z = True, then x == z = True
Extensionality
if x == y = True and f is a function whose return type is an instance of Eq, then f x == f y = True
Negation
x /= y = not (x == y)

Minimal complete definition

(==) | (/=)

Methods

(==) :: a -> a -> Bool infix 4 Source #

(/=) :: a -> a -> Bool infix 4 Source #

Instances

Instances details
Eq ByteArray Source #

Since: base-4.17.0.0

Instance details

Defined in Data.Array.Byte

Eq Timeout Source # 
Instance details

Defined in System.Timeout

Eq BigNat 
Instance details

Defined in GHC.Num.BigNat

Eq Void

Since: base-4.8.0.0

Instance details

Defined in GHC.Internal.Base

Methods

(==) :: Void -> Void -> Bool Source #

(/=) :: Void -> Void -> Bool Source #

Eq ByteOrder

Since: base-4.11.0.0

Instance details

Defined in GHC.Internal.ByteOrder

Eq ClosureType 
Instance details

Defined in GHC.Internal.ClosureTypes

Eq BlockReason

Since: base-4.3.0.0

Instance details

Defined in GHC.Internal.Conc.Sync

Eq ThreadId

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.Conc.Sync

Eq ThreadStatus

Since: base-4.3.0.0

Instance details

Defined in GHC.Internal.Conc.Sync

Eq Constr

Equality of constructors

Since: base-4.0.0.0

Instance details

Defined in GHC.Internal.Data.Data

Eq ConstrRep

Since: base-4.0.0.0

Instance details

Defined in GHC.Internal.Data.Data

Eq DataRep

Since: base-4.0.0.0

Instance details

Defined in GHC.Internal.Data.Data

Eq Fixity

Since: base-4.0.0.0

Instance details

Defined in GHC.Internal.Data.Data

Eq All

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Semigroup.Internal

Methods

(==) :: All -> All -> Bool Source #

(/=) :: All -> All -> Bool Source #

Eq Any

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Semigroup.Internal

Methods

(==) :: Any -> Any -> Bool Source #

(/=) :: Any -> Any -> Bool Source #

Eq SomeTypeRep 
Instance details

Defined in GHC.Internal.Data.Typeable.Internal

Eq Unique 
Instance details

Defined in GHC.Internal.Data.Unique

Eq Version

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Version

Eq ControlMessage

Since: base-4.4.0.0

Instance details

Defined in GHC.Internal.Event.Control

Methods

(==) :: ControlMessage -> ControlMessage -> Bool Source #

(/=) :: ControlMessage -> ControlMessage -> Bool Source #

Eq Event

Since: base-4.4.0.0

Instance details

Defined in GHC.Internal.Event.Internal.Types

Methods

(==) :: Event -> Event -> Bool Source #

(/=) :: Event -> Event -> Bool Source #

Eq EventLifetime

Since: base-4.8.0.0

Instance details

Defined in GHC.Internal.Event.Internal.Types

Methods

(==) :: EventLifetime -> EventLifetime -> Bool Source #

(/=) :: EventLifetime -> EventLifetime -> Bool Source #

Eq Lifetime

Since: base-4.8.1.0

Instance details

Defined in GHC.Internal.Event.Internal.Types

Eq FdKey

Since: base-4.4.0.0

Instance details

Defined in GHC.Internal.Event.Manager

Methods

(==) :: FdKey -> FdKey -> Bool Source #

(/=) :: FdKey -> FdKey -> Bool Source #

Eq State

Since: base-4.4.0.0

Instance details

Defined in GHC.Internal.Event.Manager

Methods

(==) :: State -> State -> Bool Source #

(/=) :: State -> State -> Bool Source #

Eq TimeoutKey 
Instance details

Defined in GHC.Internal.Event.TimeOut

Eq State

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Event.TimerManager

Methods

(==) :: State -> State -> Bool Source #

(/=) :: State -> State -> Bool Source #

Eq Unique

Since: base-4.4.0.0

Instance details

Defined in GHC.Internal.Event.Unique

Methods

(==) :: Unique -> Unique -> Bool Source #

(/=) :: Unique -> Unique -> Bool Source #

Eq ErrorCall

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Exception

Eq ArithException

Since: base-3.0

Instance details

Defined in GHC.Internal.Exception.Type

Eq SpecConstrAnnotation

Since: base-4.3.0.0

Instance details

Defined in GHC.Internal.Exts

Eq Fingerprint

Since: base-4.4.0.0

Instance details

Defined in GHC.Internal.Fingerprint.Type

Eq Errno

Since: base-2.1

Instance details

Defined in GHC.Internal.Foreign.C.Error

Methods

(==) :: Errno -> Errno -> Bool Source #

(/=) :: Errno -> Errno -> Bool Source #

Eq CBool 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Methods

(==) :: CBool -> CBool -> Bool Source #

(/=) :: CBool -> CBool -> Bool Source #

Eq CChar 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Methods

(==) :: CChar -> CChar -> Bool Source #

(/=) :: CChar -> CChar -> Bool Source #

Eq CClock 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CDouble 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CFloat 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CInt 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Methods

(==) :: CInt -> CInt -> Bool Source #

(/=) :: CInt -> CInt -> Bool Source #

Eq CIntMax 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CIntPtr 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CLLong 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CLong 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Methods

(==) :: CLong -> CLong -> Bool Source #

(/=) :: CLong -> CLong -> Bool Source #

Eq CPtrdiff 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CSChar 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CSUSeconds 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CShort 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CSigAtomic 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CSize 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Methods

(==) :: CSize -> CSize -> Bool Source #

(/=) :: CSize -> CSize -> Bool Source #

Eq CTime 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Methods

(==) :: CTime -> CTime -> Bool Source #

(/=) :: CTime -> CTime -> Bool Source #

Eq CUChar 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CUInt 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Methods

(==) :: CUInt -> CUInt -> Bool Source #

(/=) :: CUInt -> CUInt -> Bool Source #

Eq CUIntMax 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CUIntPtr 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CULLong 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CULong 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CUSeconds 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CUShort 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq CWchar 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Eq IntPtr 
Instance details

Defined in GHC.Internal.Foreign.Ptr

Eq WordPtr 
Instance details

Defined in GHC.Internal.Foreign.Ptr

Eq Associativity

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

Eq DecidedStrictness

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Eq Fixity

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

Eq SourceStrictness

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Eq SourceUnpackedness

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Eq MaskingState

Since: base-4.3.0.0

Instance details

Defined in GHC.Internal.IO

Eq BufferState

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.Buffer

Eq IODeviceType

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.Device

Eq SeekMode

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.Device

Eq CodingProgress

Since: base-4.4.0.0

Instance details

Defined in GHC.Internal.IO.Encoding.Types

Eq ArrayException

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.Exception

Eq AsyncException

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.Exception

Eq ExitCode 
Instance details

Defined in GHC.Internal.IO.Exception

Eq IOErrorType

Since: base-4.1.0.0

Instance details

Defined in GHC.Internal.IO.Exception

Eq IOException

Since: base-4.1.0.0

Instance details

Defined in GHC.Internal.IO.Exception

Eq HandlePosn

Since: base-4.1.0.0

Instance details

Defined in GHC.Internal.IO.Handle

Eq BufferMode

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.Handle.Types

Eq Handle

Since: base-4.1.0.0

Instance details

Defined in GHC.Internal.IO.Handle.Types

Eq Newline

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.Handle.Types

Eq NewlineMode

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.Handle.Types

Eq IOMode

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.IOMode

Eq IoSubSystem 
Instance details

Defined in GHC.Internal.IO.SubSystem

Eq InfoProv 
Instance details

Defined in GHC.Internal.InfoProv.Types

Eq Int16

Since: base-2.1

Instance details

Defined in GHC.Internal.Int

Methods

(==) :: Int16 -> Int16 -> Bool Source #

(/=) :: Int16 -> Int16 -> Bool Source #

Eq Int32

Since: base-2.1

Instance details

Defined in GHC.Internal.Int

Methods

(==) :: Int32 -> Int32 -> Bool Source #

(/=) :: Int32 -> Int32 -> Bool Source #

Eq Int64

Since: base-2.1

Instance details

Defined in GHC.Internal.Int

Methods

(==) :: Int64 -> Int64 -> Bool Source #

(/=) :: Int64 -> Int64 -> Bool Source #

Eq Int8

Since: base-2.1

Instance details

Defined in GHC.Internal.Int

Methods

(==) :: Int8 -> Int8 -> Bool Source #

(/=) :: Int8 -> Int8 -> Bool Source #

Eq IoManagerFlag 
Instance details

Defined in GHC.Internal.RTS.Flags

Eq StackEntry 
Instance details

Defined in GHC.Internal.Stack.CloneStack

Eq SrcLoc

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Stack.Types

Eq CBlkCnt 
Instance details

Defined in GHC.Internal.System.Posix.Types

Eq CBlkSize 
Instance details

Defined in GHC.Internal.System.Posix.Types

Eq CCc 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: CCc -> CCc -> Bool Source #

(/=) :: CCc -> CCc -> Bool Source #

Eq CClockId 
Instance details

Defined in GHC.Internal.System.Posix.Types

Eq CDev 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: CDev -> CDev -> Bool Source #

(/=) :: CDev -> CDev -> Bool Source #

Eq CFsBlkCnt 
Instance details

Defined in GHC.Internal.System.Posix.Types

Eq CFsFilCnt 
Instance details

Defined in GHC.Internal.System.Posix.Types

Eq CGid 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: CGid -> CGid -> Bool Source #

(/=) :: CGid -> CGid -> Bool Source #

Eq CId 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: CId -> CId -> Bool Source #

(/=) :: CId -> CId -> Bool Source #

Eq CIno 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: CIno -> CIno -> Bool Source #

(/=) :: CIno -> CIno -> Bool Source #

Eq CKey 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: CKey -> CKey -> Bool Source #

(/=) :: CKey -> CKey -> Bool Source #

Eq CMode 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: CMode -> CMode -> Bool Source #

(/=) :: CMode -> CMode -> Bool Source #

Eq CNfds 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: CNfds -> CNfds -> Bool Source #

(/=) :: CNfds -> CNfds -> Bool Source #

Eq CNlink 
Instance details

Defined in GHC.Internal.System.Posix.Types

Eq COff 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: COff -> COff -> Bool Source #

(/=) :: COff -> COff -> Bool Source #

Eq CPid 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: CPid -> CPid -> Bool Source #

(/=) :: CPid -> CPid -> Bool Source #

Eq CRLim 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: CRLim -> CRLim -> Bool Source #

(/=) :: CRLim -> CRLim -> Bool Source #

Eq CSocklen 
Instance details

Defined in GHC.Internal.System.Posix.Types

Eq CSpeed 
Instance details

Defined in GHC.Internal.System.Posix.Types

Eq CSsize 
Instance details

Defined in GHC.Internal.System.Posix.Types

Eq CTcflag 
Instance details

Defined in GHC.Internal.System.Posix.Types

Eq CTimer 
Instance details

Defined in GHC.Internal.System.Posix.Types

Eq CUid 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: CUid -> CUid -> Bool Source #

(/=) :: CUid -> CUid -> Bool Source #

Eq Fd 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

(==) :: Fd -> Fd -> Bool Source #

(/=) :: Fd -> Fd -> Bool Source #

Eq Lexeme

Since: base-2.1

Instance details

Defined in GHC.Internal.Text.Read.Lex

Eq Number

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Text.Read.Lex

Eq SomeChar 
Instance details

Defined in GHC.Internal.TypeLits

Eq SomeSymbol

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.TypeLits

Eq SomeNat

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.TypeNats

Eq GeneralCategory

Since: base-2.1

Instance details

Defined in GHC.Internal.Unicode

Eq Word16

Since: base-2.1

Instance details

Defined in GHC.Internal.Word

Eq Word32

Since: base-2.1

Instance details

Defined in GHC.Internal.Word

Eq Word64

Since: base-2.1

Instance details

Defined in GHC.Internal.Word

Eq Word8

Since: base-2.1

Instance details

Defined in GHC.Internal.Word

Methods

(==) :: Word8 -> Word8 -> Bool Source #

(/=) :: Word8 -> Word8 -> Bool Source #

Eq Module 
Instance details

Defined in GHC.Classes

Eq Ordering 
Instance details

Defined in GHC.Classes

Eq TrName 
Instance details

Defined in GHC.Classes

Eq TyCon 
Instance details

Defined in GHC.Classes

Methods

(==) :: TyCon -> TyCon -> Bool Source #

(/=) :: TyCon -> TyCon -> Bool Source #

Eq Integer 
Instance details

Defined in GHC.Num.Integer

Eq Natural 
Instance details

Defined in GHC.Num.Natural

Eq () 
Instance details

Defined in GHC.Classes

Methods

(==) :: () -> () -> Bool Source #

(/=) :: () -> () -> Bool Source #

Eq Bool 
Instance details

Defined in GHC.Classes

Methods

(==) :: Bool -> Bool -> Bool Source #

(/=) :: Bool -> Bool -> Bool Source #

Eq Char 
Instance details

Defined in GHC.Classes

Methods

(==) :: Char -> Char -> Bool Source #

(/=) :: Char -> Char -> Bool Source #

Eq Double

Note that due to the presence of NaN, Double's Eq instance does not satisfy reflexivity.

>>> 0/0 == (0/0 :: Double)
False

Also note that Double's Eq instance does not satisfy substitutivity:

>>> 0 == (-0 :: Double)
True
>>> recip 0 == recip (-0 :: Double)
False
Instance details

Defined in GHC.Classes

Eq Float

Note that due to the presence of NaN, Float's Eq instance does not satisfy reflexivity.

>>> 0/0 == (0/0 :: Float)
False

Also note that Float's Eq instance does not satisfy extensionality:

>>> 0 == (-0 :: Float)
True
>>> recip 0 == recip (-0 :: Float)
False
Instance details

Defined in GHC.Classes

Methods

(==) :: Float -> Float -> Bool Source #

(/=) :: Float -> Float -> Bool Source #

Eq Int 
Instance details

Defined in GHC.Classes

Methods

(==) :: Int -> Int -> Bool Source #

(/=) :: Int -> Int -> Bool Source #

Eq Word 
Instance details

Defined in GHC.Classes

Methods

(==) :: Word -> Word -> Bool Source #

(/=) :: Word -> Word -> Bool Source #

Eq (Chan a) Source #

Since: base-4.4.0.0

Instance details

Defined in Control.Concurrent.Chan

Methods

(==) :: Chan a -> Chan a -> Bool Source #

(/=) :: Chan a -> Chan a -> Bool Source #

Eq (MutableByteArray s) Source #

Since: base-4.17.0.0

Instance details

Defined in Data.Array.Byte

Eq a => Eq (Complex a) Source #

Since: base-2.1

Instance details

Defined in Data.Complex

Methods

(==) :: Complex a -> Complex a -> Bool Source #

(/=) :: Complex a -> Complex a -> Bool Source #

Eq a => Eq (First a) Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Semigroup

Methods

(==) :: First a -> First a -> Bool Source #

(/=) :: First a -> First a -> Bool Source #

Eq a => Eq (Last a) Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Semigroup

Methods

(==) :: Last a -> Last a -> Bool Source #

(/=) :: Last a -> Last a -> Bool Source #

Eq a => Eq (Max a) Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Semigroup

Methods

(==) :: Max a -> Max a -> Bool Source #

(/=) :: Max a -> Max a -> Bool Source #

Eq a => Eq (Min a) Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Semigroup

Methods

(==) :: Min a -> Min a -> Bool Source #

(/=) :: Min a -> Min a -> Bool Source #

Eq m => Eq (WrappedMonoid m) Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Semigroup

Eq a => Eq (NonEmpty a)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Base

Methods

(==) :: NonEmpty a -> NonEmpty a -> Bool Source #

(/=) :: NonEmpty a -> NonEmpty a -> Bool Source #

Eq (TVar a)

Since: base-4.8.0.0

Instance details

Defined in GHC.Internal.Conc.Sync

Methods

(==) :: TVar a -> TVar a -> Bool Source #

(/=) :: TVar a -> TVar a -> Bool Source #

Eq a => Eq (And a)

Since: base-4.16

Instance details

Defined in GHC.Internal.Data.Bits

Methods

(==) :: And a -> And a -> Bool Source #

(/=) :: And a -> And a -> Bool Source #

Eq a => Eq (Iff a)

Since: base-4.16

Instance details

Defined in GHC.Internal.Data.Bits

Methods

(==) :: Iff a -> Iff a -> Bool Source #

(/=) :: Iff a -> Iff a -> Bool Source #

Eq a => Eq (Ior a)

Since: base-4.16

Instance details

Defined in GHC.Internal.Data.Bits

Methods

(==) :: Ior a -> Ior a -> Bool Source #

(/=) :: Ior a -> Ior a -> Bool Source #

Eq a => Eq (Xor a)

Since: base-4.16

Instance details

Defined in GHC.Internal.Data.Bits

Methods

(==) :: Xor a -> Xor a -> Bool Source #

(/=) :: Xor a -> Xor a -> Bool Source #

Eq a => Eq (Identity a)

Since: base-4.8.0.0

Instance details

Defined in GHC.Internal.Data.Functor.Identity

Methods

(==) :: Identity a -> Identity a -> Bool Source #

(/=) :: Identity a -> Identity a -> Bool Source #

Eq a => Eq (First a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Monoid

Methods

(==) :: First a -> First a -> Bool Source #

(/=) :: First a -> First a -> Bool Source #

Eq a => Eq (Last a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Monoid

Methods

(==) :: Last a -> Last a -> Bool Source #

(/=) :: Last a -> Last a -> Bool Source #

Eq a => Eq (Down a)

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Data.Ord

Methods

(==) :: Down a -> Down a -> Bool Source #

(/=) :: Down a -> Down a -> Bool Source #

Eq a => Eq (Dual a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Semigroup.Internal

Methods

(==) :: Dual a -> Dual a -> Bool Source #

(/=) :: Dual a -> Dual a -> Bool Source #

Eq a => Eq (Product a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Semigroup.Internal

Methods

(==) :: Product a -> Product a -> Bool Source #

(/=) :: Product a -> Product a -> Bool Source #

Eq a => Eq (Sum a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Semigroup.Internal

Methods

(==) :: Sum a -> Sum a -> Bool Source #

(/=) :: Sum a -> Sum a -> Bool Source #

Eq (ConstPtr a) 
Instance details

Defined in GHC.Internal.Foreign.C.ConstPtr

Methods

(==) :: ConstPtr a -> ConstPtr a -> Bool Source #

(/=) :: ConstPtr a -> ConstPtr a -> Bool Source #

Eq (ForeignPtr a)

Since: base-2.1

Instance details

Defined in GHC.Internal.ForeignPtr

Eq a => Eq (ZipList a)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Functor.ZipList

Methods

(==) :: ZipList a -> ZipList a -> Bool Source #

(/=) :: ZipList a -> ZipList a -> Bool Source #

Eq p => Eq (Par1 p)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: Par1 p -> Par1 p -> Bool Source #

(/=) :: Par1 p -> Par1 p -> Bool Source #

Eq (IOPort a)

Since: base-4.1.0.0

Instance details

Defined in GHC.Internal.IOPort

Methods

(==) :: IOPort a -> IOPort a -> Bool Source #

(/=) :: IOPort a -> IOPort a -> Bool Source #

Eq (IORef a)

Pointer equality.

Since: base-4.0.0.0

Instance details

Defined in GHC.Internal.IORef

Methods

(==) :: IORef a -> IORef a -> Bool Source #

(/=) :: IORef a -> IORef a -> Bool Source #

Eq (MVar a)

Compares the underlying pointers.

Since: base-4.1.0.0

Instance details

Defined in GHC.Internal.MVar

Methods

(==) :: MVar a -> MVar a -> Bool Source #

(/=) :: MVar a -> MVar a -> Bool Source #

Eq (FunPtr a) 
Instance details

Defined in GHC.Internal.Ptr

Methods

(==) :: FunPtr a -> FunPtr a -> Bool Source #

(/=) :: FunPtr a -> FunPtr a -> Bool Source #

Eq (Ptr a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Ptr

Methods

(==) :: Ptr a -> Ptr a -> Bool Source #

(/=) :: Ptr a -> Ptr a -> Bool Source #

Eq a => Eq (Ratio a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Real

Methods

(==) :: Ratio a -> Ratio a -> Bool Source #

(/=) :: Ratio a -> Ratio a -> Bool Source #

Eq (StablePtr a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Stable

Eq (StableName a)

Since: base-2.1

Instance details

Defined in GHC.Internal.StableName

Eq (SChar c)

Since: base-4.19.0.0

Instance details

Defined in GHC.Internal.TypeLits

Methods

(==) :: SChar c -> SChar c -> Bool Source #

(/=) :: SChar c -> SChar c -> Bool Source #

Eq (SSymbol s)

Since: base-4.19.0.0

Instance details

Defined in GHC.Internal.TypeLits

Methods

(==) :: SSymbol s -> SSymbol s -> Bool Source #

(/=) :: SSymbol s -> SSymbol s -> Bool Source #

Eq (SNat n)

Since: base-4.19.0.0

Instance details

Defined in GHC.Internal.TypeNats

Methods

(==) :: SNat n -> SNat n -> Bool Source #

(/=) :: SNat n -> SNat n -> Bool Source #

Eq a => Eq (Maybe a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Maybe

Methods

(==) :: Maybe a -> Maybe a -> Bool Source #

(/=) :: Maybe a -> Maybe a -> Bool Source #

Eq a => Eq (Solo a) 
Instance details

Defined in GHC.Classes

Methods

(==) :: Solo a -> Solo a -> Bool Source #

(/=) :: Solo a -> Solo a -> Bool Source #

Eq a => Eq [a] 
Instance details

Defined in GHC.Classes

Methods

(==) :: [a] -> [a] -> Bool Source #

(/=) :: [a] -> [a] -> Bool Source #

Eq (Fixed a) Source #

Since: base-2.1

Instance details

Defined in Data.Fixed

Methods

(==) :: Fixed a -> Fixed a -> Bool Source #

(/=) :: Fixed a -> Fixed a -> Bool Source #

Eq a => Eq (Arg a b) Source #

Since: base-4.9.0.0

Instance details

Defined in Data.Semigroup

Methods

(==) :: Arg a b -> Arg a b -> Bool Source #

(/=) :: Arg a b -> Arg a b -> Bool Source #

(Ix i, Eq e) => Eq (Array i e)

Since: base-2.1

Instance details

Defined in GHC.Internal.Arr

Methods

(==) :: Array i e -> Array i e -> Bool Source #

(/=) :: Array i e -> Array i e -> Bool Source #

(Eq a, Eq b) => Eq (Either a b)

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Either

Methods

(==) :: Either a b -> Either a b -> Bool Source #

(/=) :: Either a b -> Either a b -> Bool Source #

Eq (Proxy s)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

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

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

Eq (TypeRep a)

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Typeable.Internal

Methods

(==) :: TypeRep a -> TypeRep a -> Bool Source #

(/=) :: TypeRep a -> TypeRep a -> Bool Source #

Eq (U1 p)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: U1 p -> U1 p -> Bool Source #

(/=) :: U1 p -> U1 p -> Bool Source #

Eq (V1 p)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: V1 p -> V1 p -> Bool Source #

(/=) :: V1 p -> V1 p -> Bool Source #

Eq (IOArray i e)

Since: base-4.1.0.0

Instance details

Defined in GHC.Internal.IOArray

Methods

(==) :: IOArray i e -> IOArray i e -> Bool Source #

(/=) :: IOArray i e -> IOArray i e -> Bool Source #

Eq (STRef s a)

Pointer equality.

Since: base-2.1

Instance details

Defined in GHC.Internal.STRef

Methods

(==) :: STRef s a -> STRef s a -> Bool Source #

(/=) :: STRef s a -> STRef s a -> Bool Source #

(Eq a, Eq b) => Eq (a, b) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b) -> (a, b) -> Bool Source #

(/=) :: (a, b) -> (a, b) -> Bool Source #

Eq (STArray s i e)

Since: base-2.1

Instance details

Defined in GHC.Internal.Arr

Methods

(==) :: STArray s i e -> STArray s i e -> Bool Source #

(/=) :: STArray s i e -> STArray s i e -> Bool Source #

Eq a => Eq (Const a b)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Data.Functor.Const

Methods

(==) :: Const a b -> Const a b -> Bool Source #

(/=) :: Const a b -> Const a b -> Bool Source #

Eq (f a) => Eq (Ap f a)

Since: base-4.12.0.0

Instance details

Defined in GHC.Internal.Data.Monoid

Methods

(==) :: Ap f a -> Ap f a -> Bool Source #

(/=) :: Ap f a -> Ap f a -> Bool Source #

Eq (f a) => Eq (Alt f a)

Since: base-4.8.0.0

Instance details

Defined in GHC.Internal.Data.Semigroup.Internal

Methods

(==) :: Alt f a -> Alt f a -> Bool Source #

(/=) :: Alt f a -> Alt f a -> Bool Source #

Eq (Coercion a b)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Type.Coercion

Methods

(==) :: Coercion a b -> Coercion a b -> Bool Source #

(/=) :: Coercion a b -> Coercion a b -> Bool Source #

Eq (a :~: b)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Type.Equality

Methods

(==) :: (a :~: b) -> (a :~: b) -> Bool Source #

(/=) :: (a :~: b) -> (a :~: b) -> Bool Source #

Eq (OrderingI a b) 
Instance details

Defined in GHC.Internal.Data.Type.Ord

Methods

(==) :: OrderingI a b -> OrderingI a b -> Bool Source #

(/=) :: OrderingI a b -> OrderingI a b -> Bool Source #

(Generic1 f, Eq (Rep1 f a)) => Eq (Generically1 f a)

Since: base-4.18.0.0

Instance details

Defined in GHC.Internal.Generics

Eq (f p) => Eq (Rec1 f p)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: Rec1 f p -> Rec1 f p -> Bool Source #

(/=) :: Rec1 f p -> Rec1 f p -> Bool Source #

Eq (URec (Ptr ()) p)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: URec (Ptr ()) p -> URec (Ptr ()) p -> Bool Source #

(/=) :: URec (Ptr ()) p -> URec (Ptr ()) p -> Bool Source #

Eq (URec Char p)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: URec Char p -> URec Char p -> Bool Source #

(/=) :: URec Char p -> URec Char p -> Bool Source #

Eq (URec Double p)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: URec Double p -> URec Double p -> Bool Source #

(/=) :: URec Double p -> URec Double p -> Bool Source #

Eq (URec Float p) 
Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: URec Float p -> URec Float p -> Bool Source #

(/=) :: URec Float p -> URec Float p -> Bool Source #

Eq (URec Int p)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: URec Int p -> URec Int p -> Bool Source #

(/=) :: URec Int p -> URec Int p -> Bool Source #

Eq (URec Word p)

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: URec Word p -> URec Word p -> Bool Source #

(/=) :: URec Word p -> URec Word p -> Bool Source #

(Eq a, Eq b, Eq c) => Eq (a, b, c) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c) -> (a, b, c) -> Bool Source #

(/=) :: (a, b, c) -> (a, b, c) -> Bool Source #

(Eq (f a), Eq (g a)) => Eq (Product f g a) Source #

Since: base-4.18.0.0

Instance details

Defined in Data.Functor.Product

Methods

(==) :: Product f g a -> Product f g a -> Bool Source #

(/=) :: Product f g a -> Product f g a -> Bool Source #

(Eq (f a), Eq (g a)) => Eq (Sum f g a) Source #

Since: base-4.18.0.0

Instance details

Defined in Data.Functor.Sum

Methods

(==) :: Sum f g a -> Sum f g a -> Bool Source #

(/=) :: Sum f g a -> Sum f g a -> Bool Source #

Eq (a :~~: b)

Since: base-4.10.0.0

Instance details

Defined in GHC.Internal.Data.Type.Equality

Methods

(==) :: (a :~~: b) -> (a :~~: b) -> Bool Source #

(/=) :: (a :~~: b) -> (a :~~: b) -> Bool Source #

(Eq (f p), Eq (g p)) => Eq ((f :*: g) p)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: (f :*: g) p -> (f :*: g) p -> Bool Source #

(/=) :: (f :*: g) p -> (f :*: g) p -> Bool Source #

(Eq (f p), Eq (g p)) => Eq ((f :+: g) p)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: (f :+: g) p -> (f :+: g) p -> Bool Source #

(/=) :: (f :+: g) p -> (f :+: g) p -> Bool Source #

Eq c => Eq (K1 i c p)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: K1 i c p -> K1 i c p -> Bool Source #

(/=) :: K1 i c p -> K1 i c p -> Bool Source #

(Eq a, Eq b, Eq c, Eq d) => Eq (a, b, c, d) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c, d) -> (a, b, c, d) -> Bool Source #

(/=) :: (a, b, c, d) -> (a, b, c, d) -> Bool Source #

Eq (f (g a)) => Eq (Compose f g a) Source #

Since: base-4.18.0.0

Instance details

Defined in Data.Functor.Compose

Methods

(==) :: Compose f g a -> Compose f g a -> Bool Source #

(/=) :: Compose f g a -> Compose f g a -> Bool Source #

Eq (f (g p)) => Eq ((f :.: g) p)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: (f :.: g) p -> (f :.: g) p -> Bool Source #

(/=) :: (f :.: g) p -> (f :.: g) p -> Bool Source #

Eq (f p) => Eq (M1 i c f p)

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Generics

Methods

(==) :: M1 i c f p -> M1 i c f p -> Bool Source #

(/=) :: M1 i c f p -> M1 i c f p -> Bool Source #

(Eq a, Eq b, Eq c, Eq d, Eq e) => Eq (a, b, c, d, e) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c, d, e) -> (a, b, c, d, e) -> Bool Source #

(/=) :: (a, b, c, d, e) -> (a, b, c, d, e) -> Bool Source #

(Eq a, Eq b, Eq c, Eq d, Eq e, Eq f) => Eq (a, b, c, d, e, f) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c, d, e, f) -> (a, b, c, d, e, f) -> Bool Source #

(/=) :: (a, b, c, d, e, f) -> (a, b, c, d, e, f) -> Bool Source #

(Eq a, Eq b, Eq c, Eq d, Eq e, Eq f, Eq g) => Eq (a, b, c, d, e, f, g) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c, d, e, f, g) -> (a, b, c, d, e, f, g) -> Bool Source #

(/=) :: (a, b, c, d, e, f, g) -> (a, b, c, d, e, f, g) -> Bool Source #

(Eq a, Eq b, Eq c, Eq d, Eq e, Eq f, Eq g, Eq h) => Eq (a, b, c, d, e, f, g, h) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c, d, e, f, g, h) -> (a, b, c, d, e, f, g, h) -> Bool Source #

(/=) :: (a, b, c, d, e, f, g, h) -> (a, b, c, d, e, f, g, h) -> Bool Source #

(Eq a, Eq b, Eq c, Eq d, Eq e, Eq f, Eq g, Eq h, Eq i) => Eq (a, b, c, d, e, f, g, h, i) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c, d, e, f, g, h, i) -> (a, b, c, d, e, f, g, h, i) -> Bool Source #

(/=) :: (a, b, c, d, e, f, g, h, i) -> (a, b, c, d, e, f, g, h, i) -> Bool Source #

(Eq a, Eq b, Eq c, Eq d, Eq e, Eq f, Eq g, Eq h, Eq i, Eq j) => Eq (a, b, c, d, e, f, g, h, i, j) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c, d, e, f, g, h, i, j) -> (a, b, c, d, e, f, g, h, i, j) -> Bool Source #

(/=) :: (a, b, c, d, e, f, g, h, i, j) -> (a, b, c, d, e, f, g, h, i, j) -> Bool Source #

(Eq a, Eq b, Eq c, Eq d, Eq e, Eq f, Eq g, Eq h, Eq i, Eq j, Eq k) => Eq (a, b, c, d, e, f, g, h, i, j, k) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c, d, e, f, g, h, i, j, k) -> (a, b, c, d, e, f, g, h, i, j, k) -> Bool Source #

(/=) :: (a, b, c, d, e, f, g, h, i, j, k) -> (a, b, c, d, e, f, g, h, i, j, k) -> Bool Source #

(Eq a, Eq b, Eq c, Eq d, Eq e, Eq f, Eq g, Eq h, Eq i, Eq j, Eq k, Eq l) => Eq (a, b, c, d, e, f, g, h, i, j, k, l) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c, d, e, f, g, h, i, j, k, l) -> (a, b, c, d, e, f, g, h, i, j, k, l) -> Bool Source #

(/=) :: (a, b, c, d, e, f, g, h, i, j, k, l) -> (a, b, c, d, e, f, g, h, i, j, k, l) -> Bool Source #

(Eq a, Eq b, Eq c, Eq d, Eq e, Eq f, Eq g, Eq h, Eq i, Eq j, Eq k, Eq l, Eq m) => Eq (a, b, c, d, e, f, g, h, i, j, k, l, m) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c, d, e, f, g, h, i, j, k, l, m) -> (a, b, c, d, e, f, g, h, i, j, k, l, m) -> Bool Source #

(/=) :: (a, b, c, d, e, f, g, h, i, j, k, l, m) -> (a, b, c, d, e, f, g, h, i, j, k, l, m) -> Bool Source #

(Eq a, Eq b, Eq c, Eq d, Eq e, Eq f, Eq g, Eq h, Eq i, Eq j, Eq k, Eq l, Eq m, Eq n) => Eq (a, b, c, d, e, f, g, h, i, j, k, l, m, n) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n) -> Bool Source #

(/=) :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n) -> Bool Source #

(Eq a, Eq b, Eq c, Eq d, Eq e, Eq f, Eq g, Eq h, Eq i, Eq j, Eq k, Eq l, Eq m, Eq n, Eq o) => Eq (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) 
Instance details

Defined in GHC.Classes

Methods

(==) :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) -> Bool Source #

(/=) :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) -> Bool Source #

class Eq a => Ord a where Source #

The Ord class is used for totally ordered datatypes.

Instances of Ord can be derived for any user-defined datatype whose constituent types are in Ord. The declared order of the constructors in the data declaration determines the ordering in derived Ord instances. The Ordering datatype allows a single comparison to determine the precise ordering of two objects.

Ord, as defined by the Haskell report, implements a total order and has the following properties:

Comparability
x <= y || y <= x = True
Transitivity
if x <= y && y <= z = True, then x <= z = True
Reflexivity
x <= x = True
Antisymmetry
if x <= y && y <= x = True, then x == y = True

The following operator interactions are expected to hold:

  1. x >= y = y <= x
  2. x < y = x <= y && x /= y
  3. x > y = y < x
  4. x < y = compare x y == LT
  5. x > y = compare x y == GT
  6. x == y = compare x y == EQ
  7. min x y == if x <= y then x else y = True
  8. max x y == if x >= y then x else y = True

Note that (7.) and (8.) do not require min and max to return either of their arguments. The result is merely required to equal one of the arguments in terms of (==).

Minimal complete definition: either compare or <=. Using compare can be more efficient for complex types.

Minimal complete definition

compare | (<=)

Methods

compare :: a -> a -> Ordering Source #

(<) :: a -> a -> Bool infix 4 Source #

(<=) :: a -> a -> Bool infix 4 Source #

(>) :: a -> a -> Bool infix 4 Source #

(>=) :: a -> a -> Bool infix 4 Source #

max :: a -> a -> a Source #

min :: a -> a -> a Source #

Instances

Instances details
Ord ByteArray Source #

Non-lexicographic ordering. This compares the lengths of the byte arrays first and uses a lexicographic ordering if the lengths are equal. Subject to change between major versions.

Since: base-4.17.0.0

Instance details

Defined in Data.Array.Byte

Ord BigNat 
Instance details

Defined in GHC.Num.BigNat

Ord Void

Since: base-4.8.0.0

Instance details

Defined in GHC.Internal.Base

Ord ByteOrder

Since: base-4.11.0.0

Instance details

Defined in GHC.Internal.ByteOrder

Ord ClosureType 
Instance details

Defined in GHC.Internal.ClosureTypes

Ord BlockReason

Since: base-4.3.0.0

Instance details

Defined in GHC.Internal.Conc.Sync

Ord ThreadId

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.Conc.Sync

Ord ThreadStatus

Since: base-4.3.0.0

Instance details

Defined in GHC.Internal.Conc.Sync

Ord All

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Semigroup.Internal

Methods

compare :: All -> All -> Ordering Source #

(<) :: All -> All -> Bool Source #

(<=) :: All -> All -> Bool Source #

(>) :: All -> All -> Bool Source #

(>=) :: All -> All -> Bool Source #

max :: All -> All -> All Source #

min :: All -> All -> All Source #

Ord Any

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Semigroup.Internal

Methods

compare :: Any -> Any -> Ordering Source #

(<) :: Any -> Any -> Bool Source #

(<=) :: Any -> Any -> Bool Source #

(>) :: Any -> Any -> Bool Source #

(>=) :: Any -> Any -> Bool Source #

max :: Any -> Any -> Any Source #

min :: Any -> Any -> Any Source #

Ord SomeTypeRep 
Instance details

Defined in GHC.Internal.Data.Typeable.Internal

Ord Unique 
Instance details

Defined in GHC.Internal.Data.Unique

Ord Version

Since: base-2.1

Instance details

Defined in GHC.Internal.Data.Version

Ord TimeoutKey 
Instance details

Defined in GHC.Internal.Event.TimeOut

Ord Unique

Since: base-4.4.0.0

Instance details

Defined in GHC.Internal.Event.Unique

Methods

compare :: Unique -> Unique -> Ordering Source #

(<) :: Unique -> Unique -> Bool Source #

(<=) :: Unique -> Unique -> Bool Source #

(>) :: Unique -> Unique -> Bool Source #

(>=) :: Unique -> Unique -> Bool Source #

max :: Unique -> Unique -> Unique Source #

min :: Unique -> Unique -> Unique Source #

Ord ErrorCall

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.Exception

Ord ArithException

Since: base-3.0

Instance details

Defined in GHC.Internal.Exception.Type

Ord Fingerprint

Since: base-4.4.0.0

Instance details

Defined in GHC.Internal.Fingerprint.Type

Ord CBool 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CChar 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CClock 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CDouble 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CFloat 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CInt 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CIntMax 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CIntPtr 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CLLong 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CLong 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CPtrdiff 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CSChar 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CSUSeconds 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CShort 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CSigAtomic 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CSize 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CTime 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CUChar 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CUInt 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CUIntMax 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CUIntPtr 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CULLong 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CULong 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CUSeconds 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CUShort 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord CWchar 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Ord IntPtr 
Instance details

Defined in GHC.Internal.Foreign.Ptr

Ord WordPtr 
Instance details

Defined in GHC.Internal.Foreign.Ptr

Ord Associativity

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

Ord DecidedStrictness

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Ord Fixity

Since: base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

Ord SourceStrictness

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Ord SourceUnpackedness

Since: base-4.9.0.0

Instance details

Defined in GHC.Internal.Generics

Ord SeekMode

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.Device

Ord ArrayException

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.Exception

Ord AsyncException

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.Exception

Ord ExitCode 
Instance details

Defined in GHC.Internal.IO.Exception

Ord BufferMode

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.Handle.Types

Ord Newline

Since: base-4.3.0.0

Instance details

Defined in GHC.Internal.IO.Handle.Types

Ord NewlineMode

Since: base-4.3.0.0

Instance details

Defined in GHC.Internal.IO.Handle.Types

Ord IOMode

Since: base-4.2.0.0

Instance details

Defined in GHC.Internal.IO.IOMode

Ord Int16

Since: base-2.1

Instance details

Defined in GHC.Internal.Int

Ord Int32

Since: base-2.1

Instance details

Defined in GHC.Internal.Int

Ord Int64

Since: base-2.1

Instance details

Defined in GHC.Internal.Int

Ord Int8

Since: base-2.1

Instance details

Defined in GHC.Internal.Int

Ord CBlkCnt 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CBlkSize 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CCc 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

compare :: CCc -> CCc -> Ordering Source #

(<) :: CCc -> CCc -> Bool Source #

(<=) :: CCc -> CCc -> Bool Source #

(>) :: CCc -> CCc -> Bool Source #

(>=) :: CCc -> CCc -> Bool Source #

max :: CCc -> CCc -> CCc Source #

min :: CCc -> CCc -> CCc Source #

Ord CClockId 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CDev 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CFsBlkCnt 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CFsFilCnt 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CGid 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CId 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

compare :: CId -> CId -> Ordering Source #

(<) :: CId -> CId -> Bool Source #

(<=) :: CId -> CId -> Bool Source #

(>) :: CId -> CId -> Bool Source #

(>=) :: CId -> CId -> Bool Source #

max :: CId -> CId -> CId Source #

min :: CId -> CId -> CId Source #

Ord CIno 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CKey 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CMode 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CNfds 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CNlink 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord COff 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CPid 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CRLim 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CSocklen 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CSpeed 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CSsize 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CTcflag 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CTimer 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord CUid 
Instance details

Defined in GHC.Internal.System.Posix.Types

Ord Fd 
Instance details

Defined in GHC.Internal.System.Posix.Types

Methods

compare :: Fd -> Fd -> Ordering Source #

(<) :: Fd -> Fd -> Bool Source #

(<=) :: Fd -> Fd -> Bool Source #

(>) :: Fd -> Fd -> Bool Source #

(>=) :: Fd -> Fd -> Bool Source #

max :: Fd -> Fd -> Fd Source #

min :: Fd -> Fd -> Fd Source #

Ord SomeChar 
Instance details

Defined in GHC.Internal.TypeLits

Ord SomeSymbol

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.TypeLits

Ord SomeNat

Since: base-4.7.0.0

Instance details

Defined in GHC.Internal.TypeNats

Ord GeneralCategory

Since: base-2.1

Instance details

Defined in GHC.Internal.Unicode

Ord Word16

Since: base-2.1

Instance details

Defined in GHC.Internal.Word

Ord Word32

Since: base-2.1

Instance details

Defined in GHC.Internal.Word

Ord Word64

Since: base-2.1

Instance details

Defined in GHC.Internal.Word

Ord Word8

Since: base-2.1

Instance details

Defined in GHC.Internal.Word

Ord Ordering 
Instance details

Defined in GHC.Classes

Ord TyCon 
Instance details

Defined in GHC.Classes

Ord Integer 
Instance details

Defined in GHC.Num.Integer

Ord Natural 
Instance details

Defined in GHC.Num.Natural

Ord () 
Instance details

Defined in GHC.Classes

Methods

compare :: () -> () -> Ordering Source #

(<) :: () -> () -> Bool Source #

(<=) :: () -> () -> Bool Source #

(>) :: () -> () -> Bool Source #

(>=) :: () -> () -> Bool Source #

max :: () -> () -> () Source #

min :: () -> () -> () Source #

Ord Bool 
Instance details

Defined in GHC.Classes