data-accessor-transformers-0.2.1.5: Use Accessor to access state in transformers State monad

Safe HaskellSafe-Inferred

Data.Accessor.Monad.Trans.RWS

Contents

Description

Access helper functions in a Reader-Writer-State monad

Synopsis

accessors in the form of actions in the RWS monad

set :: (Monad m, Monoid w) => T s a -> a -> RWST r w s m ()Source

get :: (Monad m, Monoid w) => T s a -> RWST r w s m aSource

modify :: (Monad m, Monoid w) => T s a -> (a -> a) -> RWST r w s m ()Source

getAndModify :: (Monad m, Monoid w) => T s a -> (a -> a) -> RWST r w s m aSource

Modify a record element and return its old value.

modifyAndGet :: (Monad m, Monoid w) => T s a -> (a -> a) -> RWST r w s m aSource

Modify a record element and return its new value.

(%=) :: (Monad m, Monoid w) => T s a -> a -> RWST r w s m ()Source

Infix variant of set.

(%:) :: (Monad m, Monoid w) => T s a -> (a -> a) -> RWST r w s m ()Source

Infix variant of modify.

lift a RWS monadic accessor to an accessor of a parent record

lift :: (Monad m, Monoid w) => T s1 s0 -> RWS r w s0 a -> RWST r w s1 m aSource

liftT :: (Monad m, Monoid w) => T s1 s0 -> RWST r w s0 m a -> RWST r w s1 m aSource