Foundation.Monad

Documentation

class Monad m => MonadIO (m :: Type -> Type) where

Monads in which IO computations may be embedded. Any monad built by applying a sequence of monad transformers to the IO monad will be an instance of this class.

Instances should satisfy the following laws, which state that liftIO is a transformer of monads:

• liftIO . return = return

• liftIO (m >>= f) = liftIO m >>= (liftIO . f)

Methods

liftIO :: IO a -> m a

Lift a computation from the IO monad.

Instances

MonadIO IO

Since: base-4.9.0.0

Defined in Control.Monad.IO.Class

Methods

liftIO :: IO a -> IO a

MonadIO m => MonadIO (ResourceT m)

Defined in Foundation.Conduit.Internal

Methods

liftIO :: IO a -> ResourceT m a

(Functor m, MonadIO m) => MonadIO (StateT s m)

Defined in Foundation.Monad.State

Methods

liftIO :: IO a -> StateT s m a

MonadIO m => MonadIO (ReaderT r m)

Defined in Foundation.Monad.Reader

Methods

liftIO :: IO a -> ReaderT r m a

MonadIO m => MonadIO (ExceptT e m)

Defined in Foundation.Monad.Except

Methods

liftIO :: IO a -> ExceptT e m a

MonadIO m => MonadIO (Conduit i o m)

Defined in Foundation.Conduit.Internal

Methods

liftIO :: IO a -> Conduit i o m a

class AMPMonad m => MonadFailure (m :: Type -> Type) where

Monad that can represent failure

Similar to MonadFail but with a parametrized Failure linked to the Monad

Associated Types

type Failure (m :: Type -> Type) :: Type

The associated type with the MonadFailure, representing what failure can be encoded in this monad

Methods

mFail :: Failure m -> m ()

Raise a Failure through a monad.

Instances

MonadFailure Maybe

Defined in Basement.Monad

Associated Types

type Failure Maybe :: Type

Methods

mFail :: Failure Maybe -> Maybe ()

MonadFailure (Either a)

Defined in Basement.Monad

Associated Types

type Failure (Either a) :: Type

Methods

mFail :: Failure (Either a) -> Either a ()

(Functor m, MonadFailure m) => MonadFailure (StateT s m)

Defined in Foundation.Monad.State

Associated Types

type Failure (StateT s m) :: Type

Methods

mFail :: Failure (StateT s m) -> StateT s m ()

MonadFailure m => MonadFailure (ReaderT r m)

Defined in Foundation.Monad.Reader

Associated Types

type Failure (ReaderT r m) :: Type

Methods

mFail :: Failure (ReaderT r m) -> ReaderT r m ()

AMPMonad m => MonadFailure (ExceptT e m)

Defined in Foundation.Monad.Except

Associated Types

type Failure (ExceptT e m) :: Type

Methods

mFail :: Failure (ExceptT e m) -> ExceptT e m ()

MonadFailure m => MonadFailure (Conduit i o m)

Defined in Foundation.Conduit.Internal

Associated Types

type Failure (Conduit i o m) :: Type

Methods

mFail :: Failure (Conduit i o m) -> Conduit i o m ()

Monad state => MonadFailure (Builder collection mutCollection step state err)

Defined in Basement.MutableBuilder

Associated Types

type Failure (Builder collection mutCollection step state err) :: Type

Methods

mFail :: Failure (Builder collection mutCollection step state err) -> Builder collection mutCollection step state err ()

class AMPMonad m => MonadThrow m where

Monad that can throw exception

Methods

throw :: Exception e => e -> m a

Throw immediatity an exception. Only a MonadCatch monad will be able to catch the exception using catch

Instances

MonadThrow IO

Defined in Foundation.Monad.Exception

Methods

throw :: Exception e => e -> IO a

MonadThrow m => MonadThrow (ResourceT m)

Defined in Foundation.Conduit.Internal

Methods

throw :: Exception e => e -> ResourceT m a

(Functor m, MonadThrow m) => MonadThrow (StateT s m)

Defined in Foundation.Monad.State

Methods

throw :: Exception e => e -> StateT s m a

MonadThrow m => MonadThrow (ReaderT r m)

Defined in Foundation.Monad.Reader

Methods

throw :: Exception e => e -> ReaderT r m a

MonadThrow m => MonadThrow (Conduit i o m)

Defined in Foundation.Conduit.Internal

Methods

throw :: Exception e => e -> Conduit i o m a

class MonadThrow m => MonadCatch m where

Monad that can catch exception

Methods

catch :: Exception e => m a -> (e -> m a) -> m a

Instances

MonadCatch IO

Defined in Foundation.Monad.Exception

Methods

catch :: Exception e => IO a -> (e -> IO a) -> IO a

MonadCatch m => MonadCatch (ResourceT m)

Defined in Foundation.Conduit.Internal

Methods

catch :: Exception e => ResourceT m a -> (e -> ResourceT m a) -> ResourceT m a

(Functor m, MonadCatch m) => MonadCatch (StateT s m)

Defined in Foundation.Monad.State

Methods

catch :: Exception e => StateT s m a -> (e -> StateT s m a) -> StateT s m a

MonadCatch m => MonadCatch (ReaderT r m)

Defined in Foundation.Monad.Reader

Methods

catch :: Exception e => ReaderT r m a -> (e -> ReaderT r m a) -> ReaderT r m a

MonadCatch m => MonadCatch (Conduit i o m)

Defined in Foundation.Conduit.Internal

Methods

catch :: Exception e => Conduit i o m a -> (e -> Conduit i o m a) -> Conduit i o m a

class MonadCatch m => MonadBracket m where

Monad that can ensure cleanup actions are performed even in the case of exceptions, both synchronous and asynchronous. This usually excludes continuation-based monads.

Methods

generalBracket

Arguments

:: m a

acquire some resource

-> (a -> b -> m ignored1)

cleanup, no exception thrown

-> (a -> SomeException -> m ignored2)

cleanup, some exception thrown. The exception will be rethrown

-> (a -> m b)

inner action to perform with the resource

-> m b

A generalized version of the standard bracket function which allows distinguishing different exit cases.

Instances

MonadBracket IO

Defined in Foundation.Monad.Exception

Methods

generalBracket :: IO a -> (a -> b -> IO ignored1) -> (a -> SomeException -> IO ignored2) -> (a -> IO b) -> IO b

MonadBracket m => MonadBracket (ResourceT m)

Defined in Foundation.Conduit.Internal

Methods

generalBracket :: ResourceT m a -> (a -> b -> ResourceT m ignored1) -> (a -> SomeException -> ResourceT m ignored2) -> (a -> ResourceT m b) -> ResourceT m b

MonadBracket m => MonadBracket (ReaderT r m)

Defined in Foundation.Monad.Reader

Methods

generalBracket :: ReaderT r m a -> (a -> b -> ReaderT r m ignored1) -> (a -> SomeException -> ReaderT r m ignored2) -> (a -> ReaderT r m b) -> ReaderT r m b

class MonadTrans trans where

Basic Transformer class

Methods

lift :: AMPMonad m => m a -> trans m a

Lift a computation from an inner monad to the current transformer monad

Instances

MonadTrans ResourceT

Defined in Foundation.Conduit.Internal

Methods

lift :: AMPMonad m => m a -> ResourceT m a

MonadTrans (StateT s)

Defined in Foundation.Monad.State

Methods

lift :: AMPMonad m => m a -> StateT s m a

MonadTrans (ReaderT r)

Defined in Foundation.Monad.Reader

Methods

lift :: AMPMonad m => m a -> ReaderT r m a

MonadTrans (ExceptT e)

Defined in Foundation.Monad.Except

Methods

lift :: AMPMonad m => m a -> ExceptT e m a

MonadTrans (Conduit i o)

Defined in Foundation.Conduit.Internal

Methods

lift :: AMPMonad m => m a -> Conduit i o m a

newtype Identity a

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

Since: base-4.8.0.0

Constructors

Identity

Fields

• runIdentity :: a

Instances

Monad Identity

Since: base-4.8.0.0

Defined in Data.Functor.Identity

Methods

(>>=) :: Identity a -> (a -> Identity b) -> Identity b

(>>) :: Identity a -> Identity b -> Identity b

return :: a -> Identity a

fail :: String -> Identity a

Functor Identity

Since: base-4.8.0.0

Defined in Data.Functor.Identity

Methods

fmap :: (a -> b) -> Identity a -> Identity b

(<$) :: a -> Identity b -> Identity a

MonadFix Identity

Since: base-4.8.0.0

Defined in Data.Functor.Identity

Methods

mfix :: (a -> Identity a) -> Identity a

Applicative Identity

Since: base-4.8.0.0

Defined in Data.Functor.Identity

Methods

pure :: a -> Identity a

(<*>) :: Identity (a -> b) -> Identity a -> Identity b

liftA2 :: (a -> b -> c) -> Identity a -> Identity b -> Identity c

(*>) :: Identity a -> Identity b -> Identity b

(<*) :: Identity a -> Identity b -> Identity a

Foldable Identity

Since: base-4.8.0.0

Defined in Data.Functor.Identity

Methods

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

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

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

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

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

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

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

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

toList :: Identity a -> [a]

null :: Identity a -> Bool

length :: Identity a -> Int

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

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

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

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

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

Traversable Identity

Since: base-4.9.0.0

Defined in Data.Traversable

Methods

traverse :: Applicative f => (a -> f b) -> Identity a -> f (Identity b)

sequenceA :: Applicative f => Identity (f a) -> f (Identity a)

mapM :: Monad m => (a -> m b) -> Identity a -> m (Identity b)

sequence :: Monad m => Identity (m a) -> m (Identity a)

Bounded a => Bounded (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

minBound :: Identity a

maxBound :: Identity a

Enum a => Enum (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

succ :: Identity a -> Identity a

pred :: Identity a -> Identity a

toEnum :: Int -> Identity a

fromEnum :: Identity a -> Int

enumFrom :: Identity a -> [Identity a]

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

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

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

Eq a => Eq (Identity a)

Since: base-4.8.0.0

Defined in Data.Functor.Identity

Methods

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

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

Floating a => Floating (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

pi :: Identity a

exp :: Identity a -> Identity a

log :: Identity a -> Identity a

sqrt :: Identity a -> Identity a

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

logBase :: Identity a -> Identity a -> Identity a

sin :: Identity a -> Identity a

cos :: Identity a -> Identity a

tan :: Identity a -> Identity a

asin :: Identity a -> Identity a

acos :: Identity a -> Identity a

atan :: Identity a -> Identity a

sinh :: Identity a -> Identity a

cosh :: Identity a -> Identity a

tanh :: Identity a -> Identity a

asinh :: Identity a -> Identity a

acosh :: Identity a -> Identity a

atanh :: Identity a -> Identity a

log1p :: Identity a -> Identity a

expm1 :: Identity a -> Identity a

log1pexp :: Identity a -> Identity a

log1mexp :: Identity a -> Identity a

Fractional a => Fractional (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

(/) :: Identity a -> Identity a -> Identity a

recip :: Identity a -> Identity a

fromRational :: Rational -> Identity a

Integral a => Integral (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

quot :: Identity a -> Identity a -> Identity a

rem :: Identity a -> Identity a -> Identity a

div :: Identity a -> Identity a -> Identity a

mod :: Identity a -> Identity a -> Identity a

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

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

toInteger :: Identity a -> Integer

Data a => Data (Identity a)

Since: base-4.9.0.0

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)

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

toConstr :: Identity a -> Constr

dataTypeOf :: Identity a -> DataType

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

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

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

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

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

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

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

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

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

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

Num a => Num (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

(+) :: Identity a -> Identity a -> Identity a

(-) :: Identity a -> Identity a -> Identity a

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

negate :: Identity a -> Identity a

abs :: Identity a -> Identity a

signum :: Identity a -> Identity a

fromInteger :: Integer -> Identity a

Ord a => Ord (Identity a)

Since: base-4.8.0.0

Defined in Data.Functor.Identity

Methods

compare :: Identity a -> Identity a -> Ordering

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

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

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

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

max :: Identity a -> Identity a -> Identity a

min :: Identity a -> Identity a -> Identity a

Read a => Read (Identity a)

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

Defined in Data.Functor.Identity

Methods

readsPrec :: Int -> ReadS (Identity a)

readList :: ReadS [Identity a]

readPrec :: ReadPrec (Identity a)

readListPrec :: ReadPrec [Identity a]

Real a => Real (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

toRational :: Identity a -> Rational

RealFloat a => RealFloat (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

floatRadix :: Identity a -> Integer

floatDigits :: Identity a -> Int

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

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

encodeFloat :: Integer -> Int -> Identity a

exponent :: Identity a -> Int

significand :: Identity a -> Identity a

scaleFloat :: Int -> Identity a -> Identity a

isNaN :: Identity a -> Bool

isInfinite :: Identity a -> Bool

isDenormalized :: Identity a -> Bool

isNegativeZero :: Identity a -> Bool

isIEEE :: Identity a -> Bool

atan2 :: Identity a -> Identity a -> Identity a

RealFrac a => RealFrac (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

properFraction :: Integral b => Identity a -> (b, Identity a)

truncate :: Integral b => Identity a -> b

round :: Integral b => Identity a -> b

ceiling :: Integral b => Identity a -> b

floor :: Integral b => Identity a -> b

Show a => Show (Identity a)

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

Defined in Data.Functor.Identity

Methods

showsPrec :: Int -> Identity a -> ShowS

show :: Identity a -> String

showList :: [Identity a] -> ShowS

Ix a => Ix (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

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

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

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

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

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

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

IsString a => IsString (Identity a)

Since: base-4.9.0.0

Defined in Data.String

Methods

fromString :: String -> Identity a

Generic (Identity a)

Defined in Data.Functor.Identity

Associated Types

type Rep (Identity a) :: Type -> Type

Methods

from :: Identity a -> Rep (Identity a) x

to :: Rep (Identity a) x -> Identity a

Semigroup a => Semigroup (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

(<>) :: Identity a -> Identity a -> Identity a

sconcat :: NonEmpty (Identity a) -> Identity a

stimes :: Integral b => b -> Identity a -> Identity a

Monoid a => Monoid (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

mempty :: Identity a

mappend :: Identity a -> Identity a -> Identity a

mconcat :: [Identity a] -> Identity a

Storable a => Storable (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

sizeOf :: Identity a -> Int

alignment :: Identity a -> Int

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

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

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

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

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

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

Bits a => Bits (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

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

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

xor :: Identity a -> Identity a -> Identity a

complement :: Identity a -> Identity a

shift :: Identity a -> Int -> Identity a

rotate :: Identity a -> Int -> Identity a

zeroBits :: Identity a

bit :: Int -> Identity a

setBit :: Identity a -> Int -> Identity a

clearBit :: Identity a -> Int -> Identity a

complementBit :: Identity a -> Int -> Identity a

testBit :: Identity a -> Int -> Bool

bitSizeMaybe :: Identity a -> Maybe Int

bitSize :: Identity a -> Int

isSigned :: Identity a -> Bool

shiftL :: Identity a -> Int -> Identity a

unsafeShiftL :: Identity a -> Int -> Identity a

shiftR :: Identity a -> Int -> Identity a

unsafeShiftR :: Identity a -> Int -> Identity a

rotateL :: Identity a -> Int -> Identity a

rotateR :: Identity a -> Int -> Identity a

popCount :: Identity a -> Int

FiniteBits a => FiniteBits (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

finiteBitSize :: Identity a -> Int

countLeadingZeros :: Identity a -> Int

countTrailingZeros :: Identity a -> Int

Generic1 Identity

Defined in Data.Functor.Identity

Associated Types

type Rep1 Identity :: k -> Type

Methods

from1 :: Identity a -> Rep1 Identity a

to1 :: Rep1 Identity a -> Identity a

type Rep (Identity a)

Since: base-4.8.0.0

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)))

type Rep1 Identity

Since: base-4.8.0.0

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))

replicateM :: Applicative m => CountOf a -> m a -> m [a]

replicateM n act performs the action n times, gathering the results.