base-4.18.1.0: Basic libraries

Copyright | (c) Andy Gill 2001 (c) Oregon Graduate Institute of Science and Technology 2001
License | BSD-style (see the file LICENSE)
Maintainer | ross@soi.city.ac.uk
Stability | stable
Portability | portable
Safe Haskell | Trustworthy
Language | Haskell2010

Data.Functor.Identity

Description

The identity functor and monad.

This trivial type constructor serves two purposes:

- It can be used with functions parameterized by functor or monad classes.
- It can be used as a base monad to which a series of monad transformers may be applied to construct a composite monad. Most monad transformer modules include the special case of applying the transformer to `Identity`. For example, `State s` is an abbreviation for `StateT s `Identity``.

Since: base-4.8.0.0

Synopsis

- newtype Identity a = Identity {
  - runIdentity :: a
  }

# Documentation

newtype Identity a Source #

Identity functor and monad. (a non-strict monad)

Since: base-4.8.0.0

Constructors

Identity |

Fields

- runIdentity :: a

#### Instances

Instances details

MonadFix Identity Source # | Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods mfix :: (a -> Identity a) -> Identity a Source #
MonadZip Identity Source # | Since: base-4.8.0.0
Instance details Defined in Control.Monad.Zip Methods mzip :: Identity a -> Identity b -> Identity (a, b) Source # mzipWith :: (a -> b -> c) -> Identity a -> Identity b -> Identity c Source # munzip :: Identity (a, b) -> (Identity a, Identity b) Source #
Foldable Identity Source # | Since: base-4.8.0.0

Instance details

Defined in Data.Functor.Identity

Methods

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

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

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

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

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

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

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

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

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

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

null :: Identity a -> Bool Source #

length :: Identity a -> Int Source #

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

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

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

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

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

Foldable1 Identity Source # | Since: base-4.18.0.0

Instance details

Defined in Data.Foldable1

Methods

fold1 :: Semigroup m => Identity m -> m Source #

foldMap1 :: Semigroup m => (a -> m) -> Identity a -> m Source #

foldMap1' :: Semigroup m => (a -> m) -> Identity a -> m Source #

toNonEmpty :: Identity a -> NonEmpty a Source #

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

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

head :: Identity a -> a Source #

last :: Identity a -> a Source #

foldrMap1 :: (a -> b) -> (a -> b -> b) -> Identity a -> b Source #

foldlMap1' :: (a -> b) -> (b -> a -> b) -> Identity a -> b Source #

foldlMap1 :: (a -> b) -> (b -> a -> b) -> Identity a -> b Source #

foldrMap1' :: (a -> b) -> (a -> b -> b) -> Identity a -> b Source #

Eq1 Identity Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftEq :: (a -> b -> Bool) -> Identity a -> Identity b -> Bool Source #
Ord1 Identity Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftCompare :: (a -> b -> Ordering) -> Identity a -> Identity b -> Ordering Source #
Read1 Identity Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftReadsPrec :: (Int -> ReadS a) -> ReadS [a] -> Int -> ReadS (Identity a) Source # liftReadList :: (Int -> ReadS a) -> ReadS [a] -> ReadS [Identity a] Source # liftReadPrec :: ReadPrec a -> ReadPrec [a] -> ReadPrec (Identity a) Source # liftReadListPrec :: ReadPrec a -> ReadPrec [a] -> ReadPrec [Identity a] Source #
Show1 Identity Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftShowsPrec :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> Identity a -> ShowS Source # liftShowList :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> [Identity a] -> ShowS Source #
Traversable Identity Source # | Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Identity a -> f (Identity b) Source # sequenceA :: Applicative f => Identity (f a) -> f (Identity a) Source # mapM :: Monad m => (a -> m b) -> Identity a -> m (Identity b) Source # sequence :: Monad m => Identity (m a) -> m (Identity a) Source #
Applicative Identity Source # | Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods pure :: a -> Identity a Source # (<*>) :: Identity (a -> b) -> Identity a -> Identity b Source # liftA2 :: (a -> b -> c) -> Identity a -> Identity b -> Identity c Source # (*>) :: Identity a -> Identity b -> Identity b Source # (<*) :: Identity a -> Identity b -> Identity a Source #
Functor Identity Source # | Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods fmap :: (a -> b) -> Identity a -> Identity b Source # (<$) :: a -> Identity b -> Identity a Source #
Monad Identity Source # | Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods (>>=) :: Identity a -> (a -> Identity b) -> Identity b Source # (>>) :: Identity a -> Identity b -> Identity b Source # return :: a -> Identity a Source #
Generic1 Identity Source # |
Instance details Defined in Data.Functor.Identity Associated Types type Rep1 Identity :: k -> Type Source # Methods from1 :: forall (a :: k). Identity a -> Rep1 Identity a Source # to1 :: forall (a :: k). Rep1 Identity a -> Identity a Source #
Data a => Data (Identity a) Source # | Since: base-4.9.0.0

Instance details

Defined in Data.Data

Methods

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

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

toConstr :: Identity a -> Constr Source #

dataTypeOf :: Identity a -> DataType Source #

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

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

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

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

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

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

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

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

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

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

IsString a => IsString (Identity a) Source # | Since: base-4.9.0.0
Instance details Defined in Data.String Methods fromString :: String -> Identity a Source #
Storable a => Storable (Identity a) Source # | Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Identity

Methods

sizeOf :: Identity a -> Int Source #

alignment :: Identity a -> Int Source #

peekElemOff :: Ptr (Identity a) -> Int -> IO (Identity a) Source #

pokeElemOff :: Ptr (Identity a) -> Int -> Identity a -> IO () Source #

peekByteOff :: Ptr b -> Int -> IO (Identity a) Source #

pokeByteOff :: Ptr b -> Int -> Identity a -> IO () Source #

peek :: Ptr (Identity a) -> IO (Identity a) Source #

poke :: Ptr (Identity a) -> Identity a -> IO () Source #

Monoid a => Monoid (Identity a) Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods mempty :: Identity a Source # mappend :: Identity a -> Identity a -> Identity a Source # mconcat :: [Identity a] -> Identity a Source #
Semigroup a => Semigroup (Identity a) Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods (<>) :: Identity a -> Identity a -> Identity a Source # sconcat :: NonEmpty (Identity a) -> Identity a Source # stimes :: Integral b => b -> Identity a -> Identity a Source #
Bits a => Bits (Identity a) Source # | Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Identity

Methods

(.&.) :: Identity a -> Identity a -> Identity a Source #

(.|.) :: Identity a -> Identity a -> Identity a Source #

xor :: Identity a -> Identity a -> Identity a Source #

complement :: Identity a -> Identity a Source #

shift :: Identity a -> Int -> Identity a Source #

rotate :: Identity a -> Int -> Identity a Source #

zeroBits :: Identity a Source #

bit :: Int -> Identity a Source #

setBit :: Identity a -> Int -> Identity a Source #

clearBit :: Identity a -> Int -> Identity a Source #

complementBit :: Identity a -> Int -> Identity a Source #

testBit :: Identity a -> Int -> Bool Source #

bitSizeMaybe :: Identity a -> Maybe Int Source #

bitSize :: Identity a -> Int Source #

isSigned :: Identity a -> Bool Source #

shiftL :: Identity a -> Int -> Identity a Source #

unsafeShiftL :: Identity a -> Int -> Identity a Source #

shiftR :: Identity a -> Int -> Identity a Source #

unsafeShiftR :: Identity a -> Int -> Identity a Source #

rotateL :: Identity a -> Int -> Identity a Source #

rotateR :: Identity a -> Int -> Identity a Source #

popCount :: Identity a -> Int Source #

FiniteBits a => FiniteBits (Identity a) Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods finiteBitSize :: Identity a -> Int Source # countLeadingZeros :: Identity a -> Int Source # countTrailingZeros :: Identity a -> Int Source #
Bounded a => Bounded (Identity a) Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods minBound :: Identity a Source # maxBound :: Identity a Source #
Enum a => Enum (Identity a) Source # | Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Identity

Methods

succ :: Identity a -> Identity a Source #

pred :: Identity a -> Identity a Source #

toEnum :: Int -> Identity a Source #

fromEnum :: Identity a -> Int Source #

enumFrom :: Identity a -> [Identity a] Source #

enumFromThen :: Identity a -> Identity a -> [Identity a] Source #

enumFromTo :: Identity a -> Identity a -> [Identity a] Source #

enumFromThenTo :: Identity a -> Identity a -> Identity a -> [Identity a] Source #

Floating a => Floating (Identity a) Source # | Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Identity

Methods

pi :: Identity a Source #

exp :: Identity a -> Identity a Source #

log :: Identity a -> Identity a Source #

sqrt :: Identity a -> Identity a Source #

(**) :: Identity a -> Identity a -> Identity a Source #

logBase :: Identity a -> Identity a -> Identity a Source #

sin :: Identity a -> Identity a Source #

cos :: Identity a -> Identity a Source #

tan :: Identity a -> Identity a Source #

asin :: Identity a -> Identity a Source #

acos :: Identity a -> Identity a Source #

atan :: Identity a -> Identity a Source #

sinh :: Identity a -> Identity a Source #

cosh :: Identity a -> Identity a Source #

tanh :: Identity a -> Identity a Source #

asinh :: Identity a -> Identity a Source #

acosh :: Identity a -> Identity a Source #

atanh :: Identity a -> Identity a Source #

log1p :: Identity a -> Identity a Source #

expm1 :: Identity a -> Identity a Source #

log1pexp :: Identity a -> Identity a Source #

log1mexp :: Identity a -> Identity a Source #

RealFloat a => RealFloat (Identity a) Source # | Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Identity

Methods

floatRadix :: Identity a -> Integer Source #

floatDigits :: Identity a -> Int Source #

floatRange :: Identity a -> (Int, Int) Source #

decodeFloat :: Identity a -> (Integer, Int) Source #

encodeFloat :: Integer -> Int -> Identity a Source #

exponent :: Identity a -> Int Source #

significand :: Identity a -> Identity a Source #

scaleFloat :: Int -> Identity a -> Identity a Source #

isNaN :: Identity a -> Bool Source #

isInfinite :: Identity a -> Bool Source #

isDenormalized :: Identity a -> Bool Source #

isNegativeZero :: Identity a -> Bool Source #

isIEEE :: Identity a -> Bool Source #

atan2 :: Identity a -> Identity a -> Identity a Source #

Generic (Identity a) Source # |
Instance details Defined in Data.Functor.Identity Associated Types type Rep (Identity a) :: Type -> Type Source # Methods from :: Identity a -> Rep (Identity a) x Source # to :: Rep (Identity a) x -> Identity a Source #
Ix a => Ix (Identity a) Source # | Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Identity

Methods

range :: (Identity a, Identity a) -> [Identity a] Source #

index :: (Identity a, Identity a) -> Identity a -> Int Source #

unsafeIndex :: (Identity a, Identity a) -> Identity a -> Int Source #

inRange :: (Identity a, Identity a) -> Identity a -> Bool Source #

rangeSize :: (Identity a, Identity a) -> Int Source #

unsafeRangeSize :: (Identity a, Identity a) -> Int Source #

Num a => Num (Identity a) Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods (+) :: Identity a -> Identity a -> Identity a Source # (-) :: Identity a -> Identity a -> Identity a Source # (*) :: Identity a -> Identity a -> Identity a Source # negate :: Identity a -> Identity a Source # abs :: Identity a -> Identity a Source # signum :: Identity a -> Identity a Source # fromInteger :: Integer -> Identity a Source #
Read a => Read (Identity a) Source # | This instance would be equivalent to the derived instances of the `Identity` newtype if the `runIdentity` field were removed Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods readsPrec :: Int -> ReadS (Identity a) Source # readList :: ReadS [Identity a] Source # readPrec :: ReadPrec (Identity a) Source # readListPrec :: ReadPrec [Identity a] Source #
Fractional a => Fractional (Identity a) Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods (/) :: Identity a -> Identity a -> Identity a Source # recip :: Identity a -> Identity a Source # fromRational :: Rational -> Identity a Source #
Integral a => Integral (Identity a) Source # | Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Identity

Methods

quot :: Identity a -> Identity a -> Identity a Source #

rem :: Identity a -> Identity a -> Identity a Source #

div :: Identity a -> Identity a -> Identity a Source #

mod :: Identity a -> Identity a -> Identity a Source #

quotRem :: Identity a -> Identity a -> (Identity a, Identity a) Source #

divMod :: Identity a -> Identity a -> (Identity a, Identity a) Source #

toInteger :: Identity a -> Integer Source #

Real a => Real (Identity a) Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods toRational :: Identity a -> Rational Source #
RealFrac a => RealFrac (Identity a) Source # | Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods properFraction :: Integral b => Identity a -> (b, Identity a) Source # truncate :: Integral b => Identity a -> b Source # round :: Integral b => Identity a -> b Source # ceiling :: Integral b => Identity a -> b Source # floor :: Integral b => Identity a -> b Source #
Show a => Show (Identity a) Source # | This instance would be equivalent to the derived instances of the `Identity` newtype if the `runIdentity` field were removed Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods showsPrec :: Int -> Identity a -> ShowS Source # show :: Identity a -> String Source # showList :: [Identity a] -> ShowS Source #
Eq a => Eq (Identity a) Source # | Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods (==) :: Identity a -> Identity a -> Bool Source # (/=) :: Identity a -> Identity a -> Bool Source #
Ord a => Ord (Identity a) Source # | Since: base-4.8.0.0

Instance details

Defined in Data.Functor.Identity

Methods

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

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

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

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

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

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

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

type Rep1 Identity Source # | Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity type Rep1 Identity = D1 ('MetaData "Identity" "Data.Functor.Identity" "base" 'True) (C1 ('MetaCons "Identity" 'PrefixI 'True) (S1 ('MetaSel ('Just "runIdentity") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) Par1))
type Rep (Identity a) Source # | Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity type Rep (Identity a) = D1 ('MetaData "Identity" "Data.Functor.Identity" "base" 'True) (C1 ('MetaCons "Identity" 'PrefixI 'True) (S1 ('MetaSel ('Just "runIdentity") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a)))