Safe Haskell	None
Language	Haskell2010

Agda.Utils.StrictReader

Synopsis

class Monad m => MonadReader r (m :: Type -> Type) | m -> r where
- ask :: m r
- local :: (r -> r) -> m a -> m a
- reader :: (r -> a) -> m a
newtype Reader r a = Reader {
- runReader :: r -> a
}
newtype ReaderT r (m :: Type -> Type) a = ReaderT {
- runReaderT :: r -> m a
}
asks :: MonadReader r m => (r -> a) -> m a

Documentation

class Monad m => MonadReader r (m :: Type -> Type) | m -> r where #

See examples in Control.Monad.Reader. Note, the partially applied function type (->) r is a simple reader monad. See the instance declaration below.

Minimal complete definition

(ask | reader), local

Methods

ask :: m r #

Retrieves the monad environment.

local #

Arguments

:: (r -> r)	The function to modify the environment.
-> m a	`Reader` to run in the modified environment.
-> m a

Executes a computation in a modified environment.

reader #

Arguments

:: (r -> a)	The selector function to apply to the environment.
-> m a

Retrieves a function of the current environment.

Instances

Instances details

MonadReader NiceEnv Nice Source #
Instance details Defined in Agda.Syntax.Concrete.Definitions.Monad Methods ask :: Nice NiceEnv # local :: (NiceEnv -> NiceEnv) -> Nice a -> Nice a # reader :: (NiceEnv -> a) -> Nice a #
MonadReader e m => MonadReader e (CatchT m) #
Instance details Defined in Control.Monad.Catch.Pure Methods ask :: CatchT m e # local :: (e -> e) -> CatchT m a -> CatchT m a # reader :: (e -> a) -> CatchT m a #
MonadReader r m => MonadReader r (ListT m) Source #
Instance details Defined in Agda.Utils.ListT Methods ask :: ListT m r # local :: (r -> r) -> ListT m a -> ListT m a # reader :: (r -> a) -> ListT m a #
MonadReader r (Reader r) Source #
Instance details Defined in Agda.Utils.StrictReader Methods ask :: Reader r r # local :: (r -> r) -> Reader r a -> Reader r a # reader :: (r -> a) -> Reader r a #
MonadReader r m => MonadReader r (MaybeT m) #
Instance details Defined in Control.Monad.Reader.Class Methods ask :: MaybeT m r # local :: (r -> r) -> MaybeT m a -> MaybeT m a # reader :: (r -> a) -> MaybeT m a #
Monad m => MonadReader r (ReaderT r m) Source #
Instance details Defined in Agda.Utils.StrictReader Methods ask :: ReaderT r m r # local :: (r -> r) -> ReaderT r m a -> ReaderT r m a # reader :: (r -> a) -> ReaderT r m a #
MonadReader r m => MonadReader r (StateT s m) Source #
Instance details Defined in Agda.Utils.StrictState Methods ask :: StateT s m r # local :: (r -> r) -> StateT s m a -> StateT s m a # reader :: (r -> a) -> StateT s m a #
(Monoid w, MonadReader r m) => MonadReader r (AccumT w m) #	Since: mtl-2.3
Instance details Defined in Control.Monad.Reader.Class Methods ask :: AccumT w m r # local :: (r -> r) -> AccumT w m a -> AccumT w m a # reader :: (r -> a) -> AccumT w m a #
MonadReader r m => MonadReader r (ExceptT e m) #	Since: mtl-2.2
Instance details Defined in Control.Monad.Reader.Class Methods ask :: ExceptT e m r # local :: (r -> r) -> ExceptT e m a -> ExceptT e m a # reader :: (r -> a) -> ExceptT e m a #
MonadReader r m => MonadReader r (IdentityT m) #
Instance details Defined in Control.Monad.Reader.Class Methods ask :: IdentityT m r # local :: (r -> r) -> IdentityT m a -> IdentityT m a # reader :: (r -> a) -> IdentityT m a #
Monad m => MonadReader r (ReaderT r m) #
Instance details Defined in Control.Monad.Reader.Class Methods ask :: ReaderT r m r # local :: (r -> r) -> ReaderT r m a -> ReaderT r m a # reader :: (r -> a) -> ReaderT r m a #
MonadReader r m => MonadReader r (StateT s m) #
Instance details Defined in Control.Monad.Reader.Class Methods ask :: StateT s m r # local :: (r -> r) -> StateT s m a -> StateT s m a # reader :: (r -> a) -> StateT s m a #
MonadReader r m => MonadReader r (StateT s m) #
Instance details Defined in Control.Monad.Reader.Class Methods ask :: StateT s m r # local :: (r -> r) -> StateT s m a -> StateT s m a # reader :: (r -> a) -> StateT s m a #
(Monoid w, MonadReader r m) => MonadReader r (WriterT w m) #	Since: mtl-2.3
Instance details Defined in Control.Monad.Reader.Class Methods ask :: WriterT w m r # local :: (r -> r) -> WriterT w m a -> WriterT w m a # reader :: (r -> a) -> WriterT w m a #
(Monoid w, MonadReader r m) => MonadReader r (WriterT w m) #
Instance details Defined in Control.Monad.Reader.Class Methods ask :: WriterT w m r # local :: (r -> r) -> WriterT w m a -> WriterT w m a # reader :: (r -> a) -> WriterT w m a #
(Monoid w, MonadReader r m) => MonadReader r (WriterT w m) #
Instance details Defined in Control.Monad.Reader.Class Methods ask :: WriterT w m r # local :: (r -> r) -> WriterT w m a -> WriterT w m a # reader :: (r -> a) -> WriterT w m a #
MonadReader r' m => MonadReader r' (SelectT r m) #	Since: mtl-2.3
Instance details Defined in Control.Monad.Reader.Class Methods ask :: SelectT r m r' # local :: (r' -> r') -> SelectT r m a -> SelectT r m a # reader :: (r' -> a) -> SelectT r m a #
MonadReader r ((->) r) #
Instance details Defined in Control.Monad.Reader.Class Methods ask :: r -> r # local :: (r -> r) -> (r -> a) -> r -> a # reader :: (r -> a) -> r -> a #
MonadReader r' m => MonadReader r' (ContT r m) #
Instance details Defined in Control.Monad.Reader.Class Methods ask :: ContT r m r' # local :: (r' -> r') -> ContT r m a -> ContT r m a # reader :: (r' -> a) -> ContT r m a #
MonadReader r m => MonadReader r (EquivT s c v m) #
Instance details Defined in Data.Equivalence.Monad Methods ask :: EquivT s c v m r # local :: (r -> r) -> EquivT s c v m a -> EquivT s c v m a # reader :: (r -> a) -> EquivT s c v m a #
(Monad m, Monoid w) => MonadReader r (RWST r w s m) #	Since: mtl-2.3
Instance details Defined in Control.Monad.Reader.Class Methods ask :: RWST r w s m r # local :: (r -> r) -> RWST r w s m a -> RWST r w s m a # reader :: (r -> a) -> RWST r w s m a #
(Monad m, Monoid w) => MonadReader r (RWST r w s m) #
Instance details Defined in Control.Monad.Reader.Class Methods ask :: RWST r w s m r # local :: (r -> r) -> RWST r w s m a -> RWST r w s m a # reader :: (r -> a) -> RWST r w s m a #
(Monad m, Monoid w) => MonadReader r (RWST r w s m) #
Instance details Defined in Control.Monad.Reader.Class Methods ask :: RWST r w s m r # local :: (r -> r) -> RWST r w s m a -> RWST r w s m a # reader :: (r -> a) -> RWST r w s m a #