Safe Haskell	Safe
Language	Haskell2010

Control.Monad.MultiReader

Contents

MultiReaderT
MonadMultiReader class
run-functions
with-functions (single Reader)
with-functions (multiple Readers)
inflate-function (run ReaderT in MultiReaderT)
other functions

Description

Deprecated: Use Control.Monad.Trans.MultiReader instead

The multi-valued version of mtl's Reader / ReaderT / MonadReader

Synopsis

MultiReaderT

newtype MultiReaderT x m a Source #

A Reader transformer monad patameterized by:

x - The list of types constituting the environment / input (to be read),
m - The inner monad.

MultiReaderT corresponds to mtl's ReaderT, but can contain a heterogenous list of types.

This heterogenous list is represented using Types.Data.List, i.e:

'[] - The empty list,
a ': b - A list where a is an arbitrary type and b is the rest list.

For example,

MultiReaderT '[Int, Bool] :: (* -> *) -> (* -> *)

is a Reader transformer containing the types [Int, Bool].

Constructors

MultiReaderT
Fields runMultiReaderTRaw :: StateT (HList x) m a

Instances

MonadBase b m => MonadBase b (MultiReaderT r m) Source #
Methods liftBase :: b α -> MultiReaderT r m α #
MonadBaseControl b m => MonadBaseControl b (MultiReaderT r m) Source #
Associated Types type StM (MultiReaderT r m :: * -> ) a :: # Methods liftBaseWith :: (RunInBase (MultiReaderT r m) b -> b a) -> MultiReaderT r m a # restoreM :: StM (MultiReaderT r m) a -> MultiReaderT r m a #
MonadState s m => MonadState s (MultiReaderT c m) Source #
Methods get :: MultiReaderT c m s # put :: s -> MultiReaderT c m () # state :: (s -> (a, s)) -> MultiReaderT c m a #
MonadWriter w m => MonadWriter w (MultiReaderT c m) Source #
Methods writer :: (a, w) -> MultiReaderT c m a # tell :: w -> MultiReaderT c m () # listen :: MultiReaderT c m a -> MultiReaderT c m (a, w) # pass :: MultiReaderT c m (a, w -> w) -> MultiReaderT c m a #
(Monad m, ContainsType a c) => MonadMultiReader a (MultiReaderT c m) Source #
Methods mAsk :: MultiReaderT c m a Source #
MonadTrans (MultiReaderT x) Source #
Methods lift :: Monad m => m a -> MultiReaderT x m a #
MonadTransControl (MultiReaderT r) Source #
Associated Types type StT (MultiReaderT r :: (* -> ) -> -> ) a :: # Methods liftWith :: Monad m => (Run (MultiReaderT r) -> m a) -> MultiReaderT r m a # restoreT :: Monad m => m (StT (MultiReaderT r) a) -> MultiReaderT r m a #
Monad m => Monad (MultiReaderT x m) Source #
Methods (>>=) :: MultiReaderT x m a -> (a -> MultiReaderT x m b) -> MultiReaderT x m b # (>>) :: MultiReaderT x m a -> MultiReaderT x m b -> MultiReaderT x m b # return :: a -> MultiReaderT x m a # fail :: String -> MultiReaderT x m a #
Functor f => Functor (MultiReaderT x f) Source #
Methods fmap :: (a -> b) -> MultiReaderT x f a -> MultiReaderT x f b # (<$) :: a -> MultiReaderT x f b -> MultiReaderT x f a #
MonadFix m => MonadFix (MultiReaderT r m) Source #
Methods mfix :: (a -> MultiReaderT r m a) -> MultiReaderT r m a #
(Applicative m, Monad m) => Applicative (MultiReaderT x m) Source #
Methods pure :: a -> MultiReaderT x m a # (<>) :: MultiReaderT x m (a -> b) -> MultiReaderT x m a -> MultiReaderT x m b # (>) :: MultiReaderT x m a -> MultiReaderT x m b -> MultiReaderT x m b # (<*) :: MultiReaderT x m a -> MultiReaderT x m b -> MultiReaderT x m a #
MonadIO m => MonadIO (MultiReaderT c m) Source #
Methods liftIO :: IO a -> MultiReaderT c m a #
(Functor m, Applicative m, MonadPlus m) => Alternative (MultiReaderT c m) Source #
Methods empty :: MultiReaderT c m a # (<\|>) :: MultiReaderT c m a -> MultiReaderT c m a -> MultiReaderT c m a # some :: MultiReaderT c m a -> MultiReaderT c m [a] # many :: MultiReaderT c m a -> MultiReaderT c m [a] #
MonadPlus m => MonadPlus (MultiReaderT c m) Source #
Methods mzero :: MultiReaderT c m a # mplus :: MultiReaderT c m a -> MultiReaderT c m a -> MultiReaderT c m a #
type StT (MultiReaderT r) a Source #
type StT (MultiReaderT r) a = (a, HList r)
type StM (MultiReaderT r m) a Source #
type StM (MultiReaderT r m) a = ComposeSt (MultiReaderT r) m a

type MultiReaderTNull = MultiReaderT '[] Source #

A MultiReader transformer carrying an empty state.

type MultiReader x = MultiReaderT x Identity Source #

A reader monad parameterized by the list of types x of the environment / input to carry.

Similar to Reader r = ReaderT r Identity

MonadMultiReader class

class Monad m => MonadMultiReader a m where Source #

All methods must be defined.

The idea is: Any monad stack is instance of MonadMultiReader a, iff the stack contains a MultiReaderT x with a element of x.

Minimal complete definition

mAsk

Methods

mAsk :: m a Source #

Instances

(MonadTrans t, Monad (t m), MonadMultiReader a m) => MonadMultiReader a (t m) Source #
Methods mAsk :: t m a Source #
(Monad m, ContainsType a c) => MonadMultiReader a (MultiReaderT c m) Source #
Methods mAsk :: MultiReaderT c m a Source #
(Monad m, ContainsType a c) => MonadMultiReader a (MultiReaderT c m) Source #
Methods mAsk :: MultiReaderT c m a Source #
(Monad m, ContainsType a r) => MonadMultiReader a (MultiRWST r w s m) Source #
Methods mAsk :: MultiRWST r w s m a Source #
(Monad m, ContainsType a r) => MonadMultiReader a (MultiRWST r w s m) Source #
Methods mAsk :: MultiRWST r w s m a Source #

run-functions

runMultiReaderT :: Monad m => HList r -> MultiReaderT r m a -> m a Source #

runMultiReaderT_ :: Functor m => HList r -> MultiReaderT r m a -> m () Source #

runMultiReaderTNil :: Monad m => MultiReaderT '[] m a -> m a Source #

runMultiReaderTNil_ :: Functor m => MultiReaderT '[] m a -> m () Source #

with-functions (single Reader)

withMultiReader :: Monad m => r -> MultiReaderT (r ': rs) m a -> MultiReaderT rs m a Source #

withMultiReader_ :: (Functor m, Monad m) => r -> MultiReaderT (r ': rs) m a -> MultiReaderT rs m () Source #

with-functions (multiple Readers)

withMultiReaders :: Monad m => HList r1 -> MultiReaderT (Append r1 r2) m a -> MultiReaderT r2 m a Source #

withMultiReaders_ :: (Functor m, Monad m) => HList r1 -> MultiReaderT (Append r1 r2) m a -> MultiReaderT r2 m () Source #

inflate-function (run ReaderT in MultiReaderT)

inflateReader :: (Monad m, ContainsType r rs) => ReaderT r m a -> MultiReaderT rs m a Source #

other functions

mapMultiReaderT :: (m (a, HList w) -> m' (a', HList w)) -> MultiReaderT w m a -> MultiReaderT w m' a' Source #

Map both the return value and the environment of a computation using the given function.

Note that there is a difference to mtl's ReaderT, where it is not possible to modify the environment.

mGetRaw :: Monad m => MultiReaderT a m (HList a) Source #

A raw extractor of the contained HList (i.e. the complete Reader).

mPutRaw :: Monad m => HList s -> MultiReaderT s m () Source #