RIO.Prelude.RIO

Documentation

newtype RIO env a

The Reader+IO monad. This is different from a ReaderT because:

• It's not a transformer, it hardcodes IO for simpler usage and error messages.
• Instances of typeclasses like MonadLogger are implemented using classes defined on the environment, instead of using an underlying monad.

Constructors

RIO

Fields

• unRIO :: ReaderT env IO a

Instances

MonadReader env (RIO env)

Methods

ask :: RIO env env

local :: (env -> env) -> RIO env a -> RIO env a

reader :: (env -> a) -> RIO env a

Monad (RIO env)

Methods

(>>=) :: RIO env a -> (a -> RIO env b) -> RIO env b

(>>) :: RIO env a -> RIO env b -> RIO env b

return :: a -> RIO env a

fail :: String -> RIO env a

Functor (RIO env)

Methods

fmap :: (a -> b) -> RIO env a -> RIO env b

(<$) :: a -> RIO env b -> RIO env a

Applicative (RIO env)

Methods

pure :: a -> RIO env a

(<*>) :: RIO env (a -> b) -> RIO env a -> RIO env b

liftA2 :: (a -> b -> c) -> RIO env a -> RIO env b -> RIO env c

(*>) :: RIO env a -> RIO env b -> RIO env b

(<*) :: RIO env a -> RIO env b -> RIO env a

MonadIO (RIO env)

Methods

liftIO :: IO a -> RIO env a

MonadThrow (RIO env)

Methods

throwM :: Exception e => e -> RIO env a

MonadUnliftIO (RIO env)

Methods

askUnliftIO :: RIO env (UnliftIO (RIO env))

withRunInIO :: ((forall a. RIO env a -> IO a) -> IO b) -> RIO env b

runRIO :: MonadIO m => env -> RIO env a -> m a

liftRIO :: (MonadIO m, MonadReader env m) => RIO env a -> m a