| Stability | experimental |
|---|---|
| Maintainer | Ertugrul Soeylemez <es@ertes.de> |
Control.ContStuff.Simple
Description
This module provides all the transformers from Control.ContStuff.Trans, but with a simplified interface, hiding the underlying CPS machinery.
- type ChoiceT m a = forall r i. ChoiceT r i m a
- choice :: [a] -> ChoiceT m a
- findAll :: (Alternative f, Applicative m) => ChoiceT m a -> m (f a)
- findAll_ :: Applicative m => ChoiceT m a -> m ()
- findFirst :: (Alternative f, Applicative m) => ChoiceT m a -> m (f a)
- findFirst_ :: Applicative m => ChoiceT m a -> m ()
- listA :: Alternative f => [a] -> f a
- listChoiceT :: Applicative m => ChoiceT m a -> m [a]
- maybeChoiceT :: Applicative m => ChoiceT m a -> m (Maybe a)
- type EitherT e m a = forall r. EitherT r e m a
- evalEitherT :: Applicative m => EitherT e m a -> m (Either e a)
- testEitherT :: Applicative m => EitherT e m a -> m Bool
- type MaybeT m a = forall r. MaybeT r m a
- evalMaybeT :: Applicative m => MaybeT m a -> m (Maybe a)
- testMaybeT :: Applicative m => MaybeT m a -> m Bool
- data ReaderT e m a
- runReaderT :: Applicative m => e -> ReaderT e m a -> m a
- type StateT s m a = forall r. StateT r s m a
- evalStateT :: Applicative m => s -> StateT s m a -> m a
- execStateT :: Applicative m => s -> StateT s m a -> m s
- type WriterT w m a = forall r. OldWriterT r w m a
- runWriterT :: (Applicative m, Monoid w) => WriterT w m a -> m (a, w)
- evalWriterT :: (Applicative m, Monoid w) => WriterT w m a -> m a
- execWriterT :: (Applicative m, Monoid w) => WriterT w m a -> m w
- module Control.Applicative
- module Control.ContStuff.Classes
- module Control.Monad
Choice/nondeterminism
findAll :: (Alternative f, Applicative m) => ChoiceT m a -> m (f a)Source
findAll_ :: Applicative m => ChoiceT m a -> m ()Source
findFirst :: (Alternative f, Applicative m) => ChoiceT m a -> m (f a)Source
findFirst_ :: Applicative m => ChoiceT m a -> m ()Source
listA :: Alternative f => [a] -> f aSource
Turn a list into a computation with alternatives.
listChoiceT :: Applicative m => ChoiceT m a -> m [a]Source
maybeChoiceT :: Applicative m => ChoiceT m a -> m (Maybe a)Source
Exceptions
evalEitherT :: Applicative m => EitherT e m a -> m (Either e a)Source
testEitherT :: Applicative m => EitherT e m a -> m BoolSource
evalMaybeT :: Applicative m => MaybeT m a -> m (Maybe a)Source
testMaybeT :: Applicative m => MaybeT m a -> m BoolSource
Reader
Monad transformer for computations with readable environment. Unlike the other monad transformers this one allows no CPS effects and also hides its constructors, which makes it commutative.
If you need CPS effects, consider using StateT.
runReaderT :: Applicative m => e -> ReaderT e m a -> m aSource
Run a computation with environment.
State
evalStateT :: Applicative m => s -> StateT s m a -> m aSource
execStateT :: Applicative m => s -> StateT s m a -> m sSource
Writer
type WriterT w m a = forall r. OldWriterT r w m aSource
runWriterT :: (Applicative m, Monoid w) => WriterT w m a -> m (a, w)Source
evalWriterT :: (Applicative m, Monoid w) => WriterT w m a -> m aSource
execWriterT :: (Applicative m, Monoid w) => WriterT w m a -> m wSource
Reexports
module Control.Applicative
module Control.ContStuff.Classes
module Control.Monad