Safe Haskell	None
Language	Haskell2010

Bluefin.Capability.Ask

Contents

Capability
Handlers
Effectful operations

Synopsis

data Ask r (e :: Effects)
runAsk :: forall r (es :: Effects) a. r -> (forall (e :: Effects). Ask r e -> Eff (e :& es) a) -> Eff es a
ask :: forall (e :: Effects) (es :: Effects) r. e <: es => Ask r e -> Eff es r
asks :: forall (e :: Effects) (es :: Effects) r a. e <: es => Ask r e -> (r -> a) -> Eff es a
local :: forall (e1 :: Effects) (es :: Effects) r a. e1 <: es => Ask r e1 -> (r -> r) -> Eff es a -> Eff es a

Documentation

Ask is Bluefin's version of the Control.Monad.Trans.Reader monad. local allows you to locally override the asked value in a well-scoped way. The original value will be restored when you exit the local block regardless of whether the exit was normal or via an exception.

Capability

data Ask r (e :: Effects) #

Instances

Instances details

e <: es => OneWayCoercible (Ask r e :: Type) (Ask r es :: Type)
Instance details Defined in Bluefin.Internal Methods oneWayCoercibleImpl :: OneWayCoercibleD (Ask r e) (Ask r es) #
Handle (Ask r)
Instance details Defined in Bluefin.Internal Methods handleImpl :: HandleD (Ask r) #
CloneableHandle (Ask r)
Instance details Defined in Bluefin.Internal.CloneableHandle Methods cloneableHandleImpl :: CloneableHandleD (Ask r)

Handlers

runAsk :: forall r (es :: Effects) a. r -> (forall (e :: Effects). Ask r e -> Eff (e :& es) a) -> Eff es a #

Effectful operations

ask :: forall (e :: Effects) (es :: Effects) r. e <: es => Ask r e -> Eff es r #

asks :: forall (e :: Effects) (es :: Effects) r a. e <: es => Ask r e -> (r -> a) -> Eff es a #

local :: forall (e1 :: Effects) (es :: Effects) r a. e1 <: es => Ask r e1 -> (r -> r) -> Eff es a -> Eff es a #