Portability	portable
Stability	provisional
Maintainer	Edward Kmett <ekmett@gmail.com>
Safe Haskell	None

Data.Functor.Plus

Description

Synopsis

Documentation

class Alt f => Plus f whereSource

Laws:

 zero <!> m = m
 m <!> zero = m

If extended to an Alternative then zero should equal empty.

Methods

Instances

Plus []
Plus IO
Plus Maybe
Plus Seq
Plus IntMap
Plus Option
(Alt (WrappedMonad m), MonadPlus m) => Plus (WrappedMonad m)
(Alt (Map k), Ord k) => Plus (Map k)
(Alt (MaybeT f), Bind f, Monad f) => Plus (MaybeT f)
(Alt (ListT f), Apply f, Applicative f) => Plus (ListT f)
(Alt (IdentityT f), Plus f) => Plus (IdentityT f)
(Alt (WrappedApplicative f), Alternative f) => Plus (WrappedApplicative f)
(Alt (WrappedArrow a b), ArrowPlus a) => Plus (WrappedArrow a b)
(Alt (WriterT w f), Plus f) => Plus (WriterT w f)
(Alt (WriterT w f), Plus f) => Plus (WriterT w f)
(Alt (StateT e f), Plus f) => Plus (StateT e f)
(Alt (StateT e f), Plus f) => Plus (StateT e f)
(Alt (ReaderT e f), Plus f) => Plus (ReaderT e f)
(Alt (ErrorT e f), Bind f, Monad f, Error e) => Plus (ErrorT e f)
(Alt (Static f a), Plus f) => Plus (Static f a)
(Alt (RWST r w s f), Plus f) => Plus (RWST r w s f)
(Alt (RWST r w s f), Plus f) => Plus (RWST r w s f)