monoid-transformer-0.0.3: Monoid counterparts to some ubiquitous monad transformers
Data.Monoid.MonadicEndo
Synopsis
newtype T m a Source
Like Data.Monoid.Endo but with monadic result. mempty is return and mappend is <=<.
mempty
return
mappend
<=<
Useful e.g. for handling options with GetOpt.
Constructors
Fields
Instances