Safe Haskell | Safe |
---|---|
Language | Haskell2010 |
Control.Applicative.Monoid
Description
This module defines the MonoidApplicative
and MonoidAlternative
type classes. Their methods are specialized
forms of the standard Applicative
and Alternative
class methods. Instances of these classes should override the
default method implementations with more efficient ones.
Documentation
class Applicative f => MonoidApplicative f where Source #
class (Alternative f, MonoidApplicative f) => MonoidAlternative f where Source #
Methods
moptional :: Monoid a => f a -> f a Source #
Like optional
, but restricted to Monoid
results.
concatMany :: Monoid a => f a -> f a Source #
Zero or more argument occurrences like many
, but concatenated.
concatSome :: Monoid a => f a -> f a Source #
One or more argument occurrences like some
, but concatenated.
Instances
(Alternative (Parser t s), Monoid s) => MonoidAlternative (Parser t s) Source # | |