Safe Haskell	None
Language	Haskell2010

Data.Cache

Synopsis

newtype Cache a = Cache {
- getCache :: a
}
withCacheA :: (Applicative m, Eq a) => Cache a -> a -> (a -> m ()) -> m ()
traceWithCache :: (Applicative m, Eq a) => Tracer m a -> Cache a -> a -> m ()
mapTraceWithCache :: (Applicative m, Eq a) => (a -> b) -> Tracer m b -> Cache a -> a -> m ()

Documentation

newtype Cache a Source #

Cache newtype wrapper allows to perform an action only if the cache is not up-to-date, i.e. different than another value dimmed more recent.

Constructors

Cache
Fields getCache :: a

Instances

Instances details

Functor Cache Source #
Instance details Defined in Data.Cache Methods fmap :: (a -> b) -> Cache a -> Cache b # (<$) :: a -> Cache b -> Cache a #
Monoid a => Monoid (Cache a) Source #
Instance details Defined in Data.Cache Methods mempty :: Cache a # mappend :: Cache a -> Cache a -> Cache a # mconcat :: [Cache a] -> Cache a #
Semigroup a => Semigroup (Cache a) Source #
Instance details Defined in Data.Cache Methods (<>) :: Cache a -> Cache a -> Cache a # sconcat :: NonEmpty (Cache a) -> Cache a # stimes :: Integral b => b -> Cache a -> Cache a #
Show a => Show (Cache a) Source #
Instance details Defined in Data.Cache Methods showsPrec :: Int -> Cache a -> ShowS # show :: Cache a -> String # showList :: [Cache a] -> ShowS #
Eq a => Eq (Cache a) Source #
Instance details Defined in Data.Cache Methods (==) :: Cache a -> Cache a -> Bool # (/=) :: Cache a -> Cache a -> Bool #

withCacheA :: (Applicative m, Eq a) => Cache a -> a -> (a -> m ()) -> m () Source #

Run a computation that depends on a certain cached value, only if the the most recent one is different.

traceWithCache :: (Applicative m, Eq a) => Tracer m a -> Cache a -> a -> m () Source #

Trace with cache only performs the tracing when the cached value is different than the most recent one.

mapTraceWithCache :: (Applicative m, Eq a) => (a -> b) -> Tracer m b -> Cache a -> a -> m () Source #

Trace with cache only performs the tracing when the cached value is different than the most recent one. And applies a function to the cache value before tracing.