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Org.Org.Semantic.HBase.Basic.HasNothing

Synopsis

class HasNothing a where nothing :: a class HasNothingKnown a where isNothing :: a -> Bool

Documentation

class HasNothing a where

Anything that has a 'nothing' value. nothing is typically a single exceptional or 'null' value in a type. zero is not the same as nothing. Methods nothing :: a Instances HasNothing (Maybe a) HasNothing (a -> a) HasNothing [a] Monad m => HasNothing (a -> m a) HasNothing (Ptr a) HasNothing (AlwaysEmptySet a) HasNothing (FunctionSet m) Eq a => HasNothing (ListSet a) HasNothing NullSet Ordered m => HasNothing (PhaseSet m) Ordered m => HasNothing (StationSet m) HasNothing (ArrayList a) HasNothing (FiniteMap from to)

class HasNothingKnown a where

A HasNothing where the nothing value is detectable. Methods isNothing :: a -> Bool Instances HasNothingKnown (Maybe a) HasNothingKnown [a] HasNothingKnown (Ptr a) HasNothingKnown (AlwaysEmptySet a) HasNothingKnown Double HasNothingKnown EIReal Eq a => HasNothingKnown (ListSet a) HasNothingKnown NullSet HasNothingKnown (SingularSet m) Ix i => HasNothingKnown (Array i e) HasNothingKnown (ArrayList a)

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