# New monads/MaybeT

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< New monads

Revision as of 13:34, 26 July 2007 by Antoine (talk | contribs) (added MonadIO and MonadState instances)

The Maybe monad deserves a transformer, just like the other classic monads.

## The code

```
{-# OPTIONS_GHC -fglasgow-exts -fallow-undecidable-instances #-}
module Control.Monad.Maybe
(MaybeT(runMaybeT),
module Control.Monad,
module Control.Monad.Trans)
where
import Control.Monad
import Control.Monad.Trans
import Control.Monad.State
newtype MaybeT m a = MaybeT {runMaybeT :: m (Maybe a)}
instance Functor m => Functor (MaybeT m) where
fmap f x = MaybeT $ fmap (fmap f) $ runMaybeT x
instance Monad m => Monad (MaybeT m) where
return = MaybeT . return . return
x >>= f = MaybeT $ runMaybeT x >>= maybe (return Nothing) (runMaybeT . f)
fail _ = MaybeT $ return Nothing
instance Monad m => MonadPlus (MaybeT m) where
mzero = MaybeT $ return mzero
mplus x y = MaybeT $ liftM2 mplus (runMaybeT x) (runMaybeT y)
-- Provide other MTL instances, for convenience
instance MonadTrans MaybeT where
lift = MaybeT . liftM return
-- (Add other MTL instances, and a MonadFix instance)
instance MonadIO m => MonadIO (maybeT m) where
liftIO = lift . liftIO
instance (MonadState s m) => MonadState s (MaybeT m) where
get = lift get
put = lift . put
```