| Safe Haskell | Safe |
|---|---|
| Language | Haskell98 |
Control.Monad.Trans.List
Description
A list monad transformer / a monadic list.
Monadic list example: A program which reads numbers from the user and accumulates them.
import Control.Monad.Trans.List.Funcs (repeatM)
import Data.List.Class (execute, scanl, takeWhile, mapL)
import Prelude hiding (scanl, takeWhile)
main =
execute . mapL print .
scanl (+) 0 .
fmap (fst . head) .
takeWhile (not . null) .
fmap reads $ repeatM getLineDocumentation
newtype ListT m a
Instances
| MonadTrans ListT | |
| Monad m => Monad (ListT m) | |
| Monad m => Functor (ListT m) | |
| Monad m => Applicative (ListT m) | |
| Monad m => Alternative (ListT m) | |
| Monad m => MonadPlus (ListT m) | |
| MonadIO m => MonadIO (ListT m) | |
| Monad m => List (ListT m) | |
| Eq (m (ListItem (ListT m) a)) => Eq (ListT m a) | |
| Ord (m (ListItem (ListT m) a)) => Ord (ListT m a) | |
| Read (m (ListItem (ListT m) a)) => Read (ListT m a) | |
| Show (m (ListItem (ListT m) a)) => Show (ListT m a) | |
| Monad m => Monoid (ListT m a) | |
| type ItemM (ListT m) = m |