foundation-0.0.15: Alternative prelude with batteries and no dependencies

Safe HaskellNone
LanguageHaskell2010

Foundation.Monad

Synopsis

Documentation

class Monad m => MonadIO m 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:

Minimal complete definition

liftIO

Methods

liftIO :: IO a -> m a #

Lift a computation from the IO monad.

Instances

MonadIO IO 

Methods

liftIO :: IO a -> IO a #

MonadIO m => MonadIO (ResourceT m) # 

Methods

liftIO :: IO a -> ResourceT m a #

MonadIO m => MonadIO (ReaderT r m) # 

Methods

liftIO :: IO a -> ReaderT r m a #

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

Methods

liftIO :: IO a -> StateT s m a #

MonadIO m => MonadIO (Conduit i o m) # 

Methods

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

class Monad m => MonadFailure m where #

Monad that can represent failure

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

Minimal complete definition

mFail

Associated Types

type Failure (m :: * -> *) :: * #

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 

Associated Types

type Failure (Maybe :: * -> *) :: * #

Methods

mFail :: Failure Maybe -> Maybe () #

MonadFailure (Either a) 

Associated Types

type Failure (Either a :: * -> *) :: * #

Methods

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

MonadFailure m => MonadFailure (ReaderT r m) # 

Associated Types

type Failure (ReaderT r m :: * -> *) :: * #

Methods

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

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

Associated Types

type Failure (StateT s m :: * -> *) :: * #

Methods

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

MonadFailure m => MonadFailure (Conduit i o m) # 

Associated Types

type Failure (Conduit i o m :: * -> *) :: * #

Methods

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

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

Associated Types

type Failure (Builder collection mutCollection step state err :: * -> *) :: * #

Methods

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

class Monad m => MonadThrow m where #

Monad that can throw exception

Minimal complete definition

throw

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 # 

Methods

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

MonadThrow m => MonadThrow (ResourceT m) # 

Methods

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

MonadThrow m => MonadThrow (ReaderT r m) # 

Methods

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

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

Methods

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

MonadThrow m => MonadThrow (Conduit i o m) # 

Methods

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

class MonadThrow m => MonadCatch m where #

Monad that can catch exception

Minimal complete definition

catch

Methods

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

Instances

MonadCatch IO # 

Methods

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

MonadCatch m => MonadCatch (ResourceT m) # 

Methods

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

MonadCatch m => MonadCatch (ReaderT r m) # 

Methods

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

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

Methods

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

MonadCatch m => MonadCatch (Conduit i o m) # 

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.

Minimal complete definition

generalBracket

Methods

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

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

Instances

MonadBracket IO # 

Methods

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

MonadBracket m => MonadBracket (ResourceT m) # 

Methods

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

class MonadTrans trans where #

Basic Transformer class

Minimal complete definition

lift

Methods

lift :: Monad m => m a -> trans m a #

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

Instances

MonadTrans ResourceT # 

Methods

lift :: Monad m => m a -> ResourceT m a #

MonadTrans (ReaderT r) # 

Methods

lift :: Monad m => m a -> ReaderT r m a #

MonadTrans (StateT s) # 

Methods

lift :: Monad m => m a -> StateT s m a #

MonadTrans (Conduit i o) # 

Methods

lift :: Monad m => m a -> Conduit i o m a #

newtype Identity a :: * -> * #

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

Since: 4.8.0.0

Constructors

Identity 

Fields

Instances

Monad 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 

Methods

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

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

MonadFix Identity 

Methods

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

Applicative Identity 

Methods

pure :: a -> Identity a #

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

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

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

Foldable 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 

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) #

Generic1 Identity 

Associated Types

type Rep1 (Identity :: * -> *) :: * -> * #

Methods

from1 :: Identity a -> Rep1 Identity a #

to1 :: Rep1 Identity a -> Identity a #

MonadZip Identity 

Methods

mzip :: Identity a -> Identity b -> Identity (a, b) #

mzipWith :: (a -> b -> c) -> Identity a -> Identity b -> Identity c #

munzip :: Identity (a, b) -> (Identity a, Identity b) #

Bounded a => Bounded (Identity a) 
Enum a => Enum (Identity a) 
Eq a => Eq (Identity a) 

Methods

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

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

Floating a => Floating (Identity a) 
Fractional a => Fractional (Identity a) 
Integral a => Integral (Identity a) 
Data a => Data (Identity a) 

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) 
Ord a => Ord (Identity a) 

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

Real a => Real (Identity a) 

Methods

toRational :: Identity a -> Rational #

RealFloat a => RealFloat (Identity a) 
RealFrac a => RealFrac (Identity a) 

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

Methods

showsPrec :: Int -> Identity a -> ShowS #

show :: Identity a -> String #

showList :: [Identity a] -> ShowS #

Ix a => Ix (Identity a) 
IsString a => IsString (Identity a) 

Methods

fromString :: String -> Identity a #

Generic (Identity a) 

Associated Types

type Rep (Identity a) :: * -> * #

Methods

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

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

Semigroup a => Semigroup (Identity a) 

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) 

Methods

mempty :: Identity a #

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

mconcat :: [Identity a] -> Identity a #

Storable a => Storable (Identity a) 

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) 
FiniteBits a => FiniteBits (Identity a) 
type Rep1 Identity 
type Rep1 Identity = D1 (MetaData "Identity" "Data.Functor.Identity" "base" True) (C1 (MetaCons "Identity" PrefixI True) (S1 (MetaSel (Just Symbol "runIdentity") NoSourceUnpackedness NoSourceStrictness DecidedLazy) Par1))
type Rep (Identity a) 
type Rep (Identity a) = D1 (MetaData "Identity" "Data.Functor.Identity" "base" True) (C1 (MetaCons "Identity" PrefixI True) (S1 (MetaSel (Just Symbol "runIdentity") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 a)))

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

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