Control.Monad.Trans.MultiReader.Strict

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

MultiReaderT

newtype MultiReaderT x m a

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)

Defined in Control.Monad.Trans.MultiReader.Strict

Methods

liftBase :: b α -> MultiReaderT r m α

MonadBaseControl b m => MonadBaseControl b (MultiReaderT r m)

Defined in Control.Monad.Trans.MultiReader.Strict

Associated Types

type StM (MultiReaderT r m) a :: Type

Methods

liftBaseWith :: (RunInBase (MultiReaderT r m) b -> b a) -> MultiReaderT r m a

restoreM :: StM (MultiReaderT r m) a -> MultiReaderT r m a

MonadWriter w m => MonadWriter w (MultiReaderT c m)

Defined in Control.Monad.Trans.MultiReader.Strict

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

MonadState s m => MonadState s (MultiReaderT c m)

Defined in Control.Monad.Trans.MultiReader.Strict

Methods

get :: MultiReaderT c m s

put :: s -> MultiReaderT c m ()

state :: (s -> (a, s)) -> MultiReaderT c m a

(Monad m, ContainsType a c) => MonadMultiGet a (MultiReaderT c m)

Defined in Control.Monad.Trans.MultiReader.Strict

Methods

mGet :: MultiReaderT c m a

(Monad m, ContainsType a c) => MonadMultiReader a (MultiReaderT c m)

Defined in Control.Monad.Trans.MultiReader.Strict

Methods

mAsk :: MultiReaderT c m a

MonadTrans (MultiReaderT x)

Defined in Control.Monad.Trans.MultiReader.Strict

Methods

lift :: Monad m => m a -> MultiReaderT x m a

MonadTransControl (MultiReaderT r)

Defined in Control.Monad.Trans.MultiReader.Strict

Associated Types

type StT (MultiReaderT r) a :: Type

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)

Defined in Control.Monad.Trans.MultiReader.Strict

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)

Defined in Control.Monad.Trans.MultiReader.Strict

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)

Defined in Control.Monad.Trans.MultiReader.Strict

Methods

mfix :: (a -> MultiReaderT r m a) -> MultiReaderT r m a

(Applicative m, Monad m) => Applicative (MultiReaderT x m)

Defined in Control.Monad.Trans.MultiReader.Strict

Methods

pure :: a -> MultiReaderT x m a

(<*>) :: MultiReaderT x m (a -> b) -> MultiReaderT x m a -> MultiReaderT x m b

liftA2 :: (a -> b -> c) -> MultiReaderT x m a -> MultiReaderT x m b -> MultiReaderT x m c

(*>) :: 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)

Defined in Control.Monad.Trans.MultiReader.Strict

Methods

liftIO :: IO a -> MultiReaderT c m a

(Functor m, Applicative m, MonadPlus m) => Alternative (MultiReaderT c m)

Defined in Control.Monad.Trans.MultiReader.Strict

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)

Defined in Control.Monad.Trans.MultiReader.Strict

Methods

mzero :: MultiReaderT c m a

mplus :: MultiReaderT c m a -> MultiReaderT c m a -> MultiReaderT c m a

type StT (MultiReaderT r) a

Defined in Control.Monad.Trans.MultiReader.Strict

type StT (MultiReaderT r) a = (a, HList r)

type StM (MultiReaderT r m) a

Defined in Control.Monad.Trans.MultiReader.Strict

type StM (MultiReaderT r m) a = ComposeSt (MultiReaderT r) m a

type MultiReaderTNull = MultiReaderT '[]

A MultiReader transformer carrying an empty state.

type MultiReader x = MultiReaderT x Identity

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

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.

Methods

mAsk

Arguments

:: m a

Access to a specific type in the environment.

Instances

(MonadTrans t, Monad (t m), MonadMultiReader a m) => MonadMultiReader a (t m)

Defined in Control.Monad.Trans.MultiReader.Class

Methods

mAsk :: t m a

(Monad m, ContainsType a c) => MonadMultiReader a (MultiReaderT c m)

Defined in Control.Monad.Trans.MultiReader.Strict

Methods

mAsk :: MultiReaderT c m a

(Monad m, ContainsType a c) => MonadMultiReader a (MultiReaderT c m)

Defined in Control.Monad.Trans.MultiReader.Lazy

Methods

mAsk :: MultiReaderT c m a

(Monad m, ContainsType a r) => MonadMultiReader a (MultiRWST r w s m)

Defined in Control.Monad.Trans.MultiRWS.Strict

Methods

mAsk :: MultiRWST r w s m a

(Monad m, ContainsType a r) => MonadMultiReader a (MultiRWST r w s m)

Defined in Control.Monad.Trans.MultiRWS.Lazy

Methods

mAsk :: MultiRWST r w s m a

class Monad m => MonadMultiGet a m where

In contrast to MonadMultiReader, MonadMultiGet is defined for State too, so it corresponds to read-access of any kind.

Note however that for MultiRWS, only the values from the state part can be accessed via MonadMultiGet, due to limitations of the design of MultiRWS and of the type system. This is issue is resolved in the MultiGST type.

Methods

mGet

Arguments

:: m a

Access to a specific type in the environment.

Instances

(MonadTrans t, Monad (t m), MonadMultiGet a m) => MonadMultiGet a (t m)

Defined in Control.Monad.Trans.MultiGet.Class

Methods

mGet :: t m a

(Monad m, ContainsType a c) => MonadMultiGet a (MultiStateT c m)

Defined in Control.Monad.Trans.MultiState.Strict

Methods

mGet :: MultiStateT c m a

(Monad m, ContainsType a c) => MonadMultiGet a (MultiStateT c m)

Defined in Control.Monad.Trans.MultiState.Lazy

Methods

mGet :: MultiStateT c m a

(Monad m, ContainsType a c) => MonadMultiGet a (MultiReaderT c m)

Defined in Control.Monad.Trans.MultiReader.Strict

Methods

mGet :: MultiReaderT c m a

(Monad m, ContainsType a c) => MonadMultiGet a (MultiReaderT c m)

Defined in Control.Monad.Trans.MultiReader.Lazy

Methods

mGet :: MultiReaderT c m a

(Monad m, HListMContains GettableFlag a cts) => MonadMultiGet a (MultiGSTT cts m)

Defined in Control.Monad.Trans.MultiGST.Strict

Methods

mGet :: MultiGSTT cts m a

(Monad m, HListMContains GettableFlag a cts) => MonadMultiGet a (MultiGSTT cts m)

Defined in Control.Monad.Trans.MultiGST.Lazy

Methods

mGet :: MultiGSTT cts m a

(Monad m, ContainsType a s) => MonadMultiGet a (MultiRWST r w s m)

Defined in Control.Monad.Trans.MultiRWS.Strict

Methods

mGet :: MultiRWST r w s m a

(Monad m, ContainsType a s) => MonadMultiGet a (MultiRWST r w s m)

Defined in Control.Monad.Trans.MultiRWS.Lazy

Methods

mGet :: MultiRWST r w s m a

run-functions

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

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

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

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

with-functions (single reader)

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

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

with-functions (multiple readers)

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

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

without-function (single reader)

withoutMultiReader :: Monad m => MultiReaderT rs m a -> MultiReaderT (r ': rs) m a

inflate-function (run ReaderT in MultiReaderT)

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

other functions

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

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)

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

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