Safe Haskell	None
Language	Haskell2010

Data.Monoid.DecidablyEmpty

Synopsis

class Monoid a => DecidablyEmpty a where
- isEmpty :: a -> Bool

Documentation

class Monoid a => DecidablyEmpty a where Source #

A DecidablyEmpty is one where it can be computed whether or not an arbitrary value is mempty.

By using this class rather than Eq, we avoid unnecessary constraining the contents of Functors. This makes it possible to efficiently combine and/or nest patch maps with Eq-lacking values (e.g. functions) at the leaves.

Minimal complete definition

Nothing

Methods

isEmpty :: a -> Bool Source #

default isEmpty :: Eq a => a -> Bool Source #

Instances

Instances details

DecidablyEmpty Ordering Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Ordering -> Bool Source #
DecidablyEmpty () Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: () -> Bool Source #
DecidablyEmpty All Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: All -> Bool Source #
DecidablyEmpty Any Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Any -> Bool Source #
DecidablyEmpty IntSet Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: IntSet -> Bool Source #
DecidablyEmpty [a] Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: [a] -> Bool Source #
Semigroup a => DecidablyEmpty (Maybe a) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Maybe a -> Bool Source #
DecidablyEmpty p => DecidablyEmpty (Par1 p) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Par1 p -> Bool Source #
(Ord a, Bounded a) => DecidablyEmpty (Min a) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Min a -> Bool Source #
(Ord a, Bounded a) => DecidablyEmpty (Max a) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Max a -> Bool Source #
DecidablyEmpty m => DecidablyEmpty (WrappedMonoid m) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: WrappedMonoid m -> Bool Source #
Semigroup a => DecidablyEmpty (Option a) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Option a -> Bool Source #
DecidablyEmpty a => DecidablyEmpty (Identity a) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Identity a -> Bool Source #
DecidablyEmpty (First a) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: First a -> Bool Source #
DecidablyEmpty (Last a) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Last a -> Bool Source #
DecidablyEmpty a => DecidablyEmpty (Dual a) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Dual a -> Bool Source #
(DecidablyEmpty a, Num a) => DecidablyEmpty (Sum a) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Sum a -> Bool Source #
(Num a, DecidablyEmpty a) => DecidablyEmpty (Product a) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Product a -> Bool Source #
DecidablyEmpty a => DecidablyEmpty (Down a) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Down a -> Bool Source #
DecidablyEmpty (IntMap v) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: IntMap v -> Bool Source #
DecidablyEmpty (Seq v) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Seq v -> Bool Source #
Ord k => DecidablyEmpty (Set k) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Set k -> Bool Source #
DecidablyEmpty (PatchIntMap a) Source #
Instance details Defined in Data.Patch.IntMap Methods isEmpty :: PatchIntMap a -> Bool Source #
DecidablyEmpty (U1 p) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: U1 p -> Bool Source #
(DecidablyEmpty a, DecidablyEmpty b) => DecidablyEmpty (a, b) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: (a, b) -> Bool Source #
Ord k => DecidablyEmpty (Map k v) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Map k v -> Bool Source #
DecidablyEmpty (Proxy s) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Proxy s -> Bool Source #
Ord k => DecidablyEmpty (PatchMap k v) Source #
Instance details Defined in Data.Patch.Map Methods isEmpty :: PatchMap k v -> Bool Source #
(Ord k, DecidablyEmpty p, Patch p) => DecidablyEmpty (PatchMapWithPatchingMove k p) Source #
Instance details Defined in Data.Patch.MapWithPatchingMove Methods isEmpty :: PatchMapWithPatchingMove k p -> Bool Source #
DecidablyEmpty (f p) => DecidablyEmpty (Rec1 f p) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Rec1 f p -> Bool Source #
(DecidablyEmpty a, DecidablyEmpty b, DecidablyEmpty c) => DecidablyEmpty (a, b, c) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: (a, b, c) -> Bool Source #
DecidablyEmpty a => DecidablyEmpty (Const a b) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: Const a b -> Bool Source #
GCompare k2 => DecidablyEmpty (DMap k2 v) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: DMap k2 v -> Bool Source #
GCompare k2 => DecidablyEmpty (PatchDMap k2 v) Source #
Instance details Defined in Data.Patch.DMap Methods isEmpty :: PatchDMap k2 v -> Bool Source #
GCompare k2 => DecidablyEmpty (PatchDMapWithMove k2 v) Source #
Instance details Defined in Data.Patch.DMapWithMove Methods isEmpty :: PatchDMapWithMove k2 v -> Bool Source #
DecidablyEmpty c => DecidablyEmpty (K1 i c p) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: K1 i c p -> Bool Source #
(DecidablyEmpty (f p), DecidablyEmpty (g p)) => DecidablyEmpty ((f :*: g) p) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: (f :*: g) p -> Bool Source #
(DecidablyEmpty a, DecidablyEmpty b, DecidablyEmpty c, DecidablyEmpty d) => DecidablyEmpty (a, b, c, d) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: (a, b, c, d) -> Bool Source #
DecidablyEmpty (f p) => DecidablyEmpty (M1 i c f p) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: M1 i c f p -> Bool Source #
DecidablyEmpty (f (g p)) => DecidablyEmpty ((f :.: g) p) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: (f :.: g) p -> Bool Source #
(DecidablyEmpty a, DecidablyEmpty b, DecidablyEmpty c, DecidablyEmpty d, DecidablyEmpty e) => DecidablyEmpty (a, b, c, d, e) Source #
Instance details Defined in Data.Monoid.DecidablyEmpty Methods isEmpty :: (a, b, c, d, e) -> Bool Source #