Safe Haskell	None
Language	Haskell2010

Polysemy.Reader

Contents

Synopsis

data Reader i m a where
- Ask :: Reader i m i
- Local :: (i -> i) -> m a -> Reader i m a
ask :: forall i r. MemberWithError (Reader i) r => Sem r i
asks :: forall i j r. Member (Reader i) r => (i -> j) -> Sem r j
local :: forall i r a. MemberWithError (Reader i) r => (i -> i) -> Sem r a -> Sem r a
runReader :: i -> Sem (Reader i ': r) a -> Sem r a
inputToReader :: Member (Reader i) r => Sem (Input i ': r) a -> Sem r a

Effect

data Reader i m a where Source #

An effect corresponding to ReaderT.

Constructors

Ask :: Reader i m i
Local :: (i -> i) -> m a -> Reader i m a

Instances details

type DefiningModule Reader Source #
Instance details Defined in Polysemy.Reader type DefiningModule Reader = "Polysemy.Reader"

Actions

asks :: forall i j r. Member (Reader i) r => (i -> j) -> Sem r j Source #

local :: forall i r a. MemberWithError (Reader i) r => (i -> i) -> Sem r a -> Sem r a Source #

runReader :: i -> Sem (Reader i ': r) a -> Sem r a Source #

Run a Reader effect with a constant value.

Transform an Input effect into a Reader effect.

Since: 1.0.0.0