lens-4.15.4: Lenses, Folds and Traversals

Copyright(C) 2012-16 Edward Kmett
LicenseBSD-style (see the file LICENSE)
MaintainerEdward Kmett <ekmett@gmail.com>
Stabilityprovisional
Portabilitynon-portable
Safe HaskellTrustworthy
LanguageHaskell98

Control.Lens.Empty

Description

 

Documentation

class AsEmpty a where Source #

Methods

_Empty :: Prism' a () Source #

>>> isn't _Empty [1,2,3]
True

_Empty :: (Monoid a, Eq a) => Prism' a () Source #

>>> isn't _Empty [1,2,3]
True

Instances

AsEmpty Ordering Source # 
AsEmpty () Source # 

Methods

_Empty :: Prism' () () Source #

AsEmpty Event Source # 

Methods

_Empty :: Prism' Event () Source #

AsEmpty All Source # 

Methods

_Empty :: Prism' All () Source #

AsEmpty Any Source # 

Methods

_Empty :: Prism' Any () Source #

AsEmpty ByteString Source # 
AsEmpty ByteString Source # 
AsEmpty IntSet Source # 

Methods

_Empty :: Prism' IntSet () Source #

AsEmpty Text Source # 

Methods

_Empty :: Prism' Text () Source #

AsEmpty Text Source # 

Methods

_Empty :: Prism' Text () Source #

AsEmpty [a] Source # 

Methods

_Empty :: Prism' [a] () Source #

AsEmpty (Maybe a) Source # 

Methods

_Empty :: Prism' (Maybe a) () Source #

AsEmpty a => AsEmpty (Dual a) Source # 

Methods

_Empty :: Prism' (Dual a) () Source #

(Eq a, Num a) => AsEmpty (Sum a) Source # 

Methods

_Empty :: Prism' (Sum a) () Source #

(Eq a, Num a) => AsEmpty (Product a) Source # 

Methods

_Empty :: Prism' (Product a) () Source #

AsEmpty (First a) Source # 

Methods

_Empty :: Prism' (First a) () Source #

AsEmpty (Last a) Source # 

Methods

_Empty :: Prism' (Last a) () Source #

AsEmpty (IntMap a) Source # 

Methods

_Empty :: Prism' (IntMap a) () Source #

AsEmpty (Seq a) Source # 

Methods

_Empty :: Prism' (Seq a) () Source #

AsEmpty (Set a) Source # 

Methods

_Empty :: Prism' (Set a) () Source #

AsEmpty (HashSet a) Source # 

Methods

_Empty :: Prism' (HashSet a) () Source #

Unbox a => AsEmpty (Vector a) Source # 

Methods

_Empty :: Prism' (Vector a) () Source #

Storable a => AsEmpty (Vector a) Source # 

Methods

_Empty :: Prism' (Vector a) () Source #

AsEmpty (Vector a) Source # 

Methods

_Empty :: Prism' (Vector a) () Source #

(AsEmpty a, AsEmpty b) => AsEmpty (a, b) Source # 

Methods

_Empty :: Prism' (a, b) () Source #

AsEmpty (Map k a) Source # 

Methods

_Empty :: Prism' (Map k a) () Source #

AsEmpty (HashMap k a) Source # 

Methods

_Empty :: Prism' (HashMap k a) () Source #

(AsEmpty a, AsEmpty b, AsEmpty c) => AsEmpty (a, b, c) Source # 

Methods

_Empty :: Prism' (a, b, c) () Source #

pattern Empty :: forall s. AsEmpty s => s Source #