-- Hoogle documentation, generated by Haddock
-- See Hoogle, http://www.haskell.org/hoogle/


-- | Container with element counts
--   
--   Container with element counts
@package refcount
@version 0.0.0

module Data.Refcount

-- | Maintain a collection of objects with duplication counts.
newtype Refcount a
Refcount :: HashMap a Int -> Refcount a
unRefcount :: Refcount a -> HashMap a Int

-- | Retrieve the refcounted objects.
refcounted :: Refcount a -> [a]

-- | Insert an object and increment its count.
insertRef :: (Hashable a, Eq a) => a -> Refcount a -> Refcount a

-- | Remove a reference to an element and decrease its count, possibly
--   removing it from the set. Returns <tt>Nothing</tt> if the element
--   wasn't found, or <tt>Just set</tt>.
deleteRef :: (Hashable a, Eq a) => a -> Refcount a -> Maybe (Refcount a)

-- | Remove a reference to an element and decrease its count, possibly
--   removing it from the set. Returns <tt>Nothing</tt> if the element
--   wasn't found, or <tt>Just (wasRemoved, set)</tt>.
removeRef :: (Hashable a, Eq a) => a -> Refcount a -> Maybe (Bool, Refcount a)
instance (Hashable a, Eq a) => Monoid (Refcount a)