-- Hoogle documentation, generated by Haddock -- See Hoogle, http://www.haskell.org/hoogle/ -- | Compact Data.Map implementation using Data.Binary -- -- This library attempts to provide a memory efficient alternative to -- Data.Map. @package compact-map @version 2008.11.8 -- | An efficient implementation of maps from keys to values -- (dictionaries). -- -- Since many function names (but not the type name) clash with -- Prelude names, this module is usually imported -- qualified, e.g. -- -- 
--   import Data.CompactMap (Map)
--   import qualified Data.CompactMap as Map
--
-- -- The implementation of Map is based on size balanced -- binary trees (or trees of bounded balance) as described by: -- -- -- -- Note that the implementation is left-biased -- the elements of -- a first argument are always preferred to the second, for example in -- union or insert. -- -- Operation comments contain the operation time complexity in the Big-O -- notation http://en.wikipedia.org/wiki/Big_O_notation. module Data.CompactMap -- | A Map from keys k to values a. data Map k a -- | O(log n). Find the value at a key. Calls error when the -- element can not be found. -- -- 
--   fromList [(5,'a'), (3,'b')] ! 1    Error: element not in the map
--   fromList [(5,'a'), (3,'b')] ! 5 == 'a'
--
(!) :: (Ord k, Binary k, Binary a) => Map k a -> k -> a -- | O(1). Is the map empty? -- -- 
--   Data.Map.null (empty)           == True
--   Data.Map.null (singleton 1 'a') == False
--
null :: Map k a -> Bool -- | O(1). The number of elements in the map. -- -- 
--   size empty                                   == 0
--   size (singleton 1 'a')                       == 1
--   size (fromList([(1,'a'), (2,'c'), (3,'b')])) == 3
--
size :: Map k a -> Int -- | O(log n). Is the key a member of the map? See also -- notMember. -- -- 
--   member 5 (fromList [(5,'a'), (3,'b')]) == True
--   member 1 (fromList [(5,'a'), (3,'b')]) == False
--
member :: (Ord k, Binary k) => k -> Map k a -> Bool -- | O(log n). Is the key not a member of the map? See also -- member. -- -- 
--   notMember 5 (fromList [(5,'a'), (3,'b')]) == False
--   notMember 1 (fromList [(5,'a'), (3,'b')]) == True
--
notMember :: (Ord k, Binary k) => k -> Map k a -> Bool -- | O(log n). Lookup the value at a key in the map. -- -- The function will return the corresponding value as (Just -- value), or Nothing if the key isn't in the map. -- -- An example of using lookup: -- -- 
--   import Prelude hiding (lookup)
--   import Data.Map
--   
--   employeeDept = fromList([("John","Sales"), ("Bob","IT")])
--   deptCountry = fromList([("IT","USA"), ("Sales","France")])
--   countryCurrency = fromList([("USA", "Dollar"), ("France", "Euro")])
--   
--   employeeCurrency :: String -> Maybe String
--   employeeCurrency name = do
--       dept <- lookup name employeeDept
--       country <- lookup dept deptCountry
--       lookup country countryCurrency
--   
--   main = do
--       putStrLn $ "John's currency: " ++ (show (employeeCurrency "John"))
--       putStrLn $ "Pete's currency: " ++ (show (employeeCurrency "Pete"))
--
-- -- The output of this program: -- -- 
--   John's currency: Just "Euro"
--   Pete's currency: Nothing
--
lookup :: (Ord k, Binary k, Binary a) => k -> Map k a -> Maybe a -- | O(log n). The expression (findWithDefault def k -- map) returns the value at key k or returns default value -- def when the key is not in the map. -- -- 
--   findWithDefault 'x' 1 (fromList [(5,'a'), (3,'b')]) == 'x'
--   findWithDefault 'x' 5 (fromList [(5,'a'), (3,'b')]) == 'a'
--
findWithDefault :: (Ord k, Binary k, Binary a) => a -> k -> Map k a -> a -- | O(1). The empty map. -- -- 
--   empty      == fromList []
--   size empty == 0
--
empty :: Map k a -- | O(1). A map with a single element. -- -- 
--   singleton 1 'a'        == fromList [(1, 'a')]
--   size (singleton 1 'a') == 1
--
singleton :: (Ord k, Binary k, Binary a) => k -> a -> Map k a -- | O(log n). Insert a new key and value in the map. If the key is -- already present in the map, the associated value is replaced with the -- supplied value. insert is equivalent to insertWith -- const. -- -- 
--   insert 5 'x' (fromList [(5,'a'), (3,'b')]) == fromList [(3, 'b'), (5, 'x')]
--   insert 7 'x' (fromList [(5,'a'), (3,'b')]) == fromList [(3, 'b'), (5, 'a'), (7, 'x')]
--   insert 5 'x' empty                         == singleton 5 'x'
--
insert :: (Ord k, Binary k, Binary a) => k -> a -> Map k a -> Map k a -- | O(log n). Insert with a function, combining new value and old -- value. insertWith f key value mp will insert the pair -- (key, value) into mp if key does not exist in the map. If the -- key does exist, the function will insert the pair (key, f -- new_value old_value). -- -- 
--   insertWith (++) 5 "xxx" (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "xxxa")]
--   insertWith (++) 7 "xxx" (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a"), (7, "xxx")]
--   insertWith (++) 5 "xxx" empty                         == singleton 5 "xxx"
--
insertWith :: (Ord k, Binary k, Binary a) => (a -> a -> a) -> k -> a -> Map k a -> Map k a -- | O(log n). Insert with a function, combining key, new value and -- old value. insertWithKey f key value mp will insert -- the pair (key, value) into mp if key does not exist in the -- map. If the key does exist, the function will insert the pair -- (key,f key new_value old_value). Note that the key passed to -- f is the same key passed to insertWithKey. -- -- 
--   let f key new_value old_value = (show key) ++ ":" ++ new_value ++ "|" ++ old_value
--   insertWithKey f 5 "xxx" (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "5:xxx|a")]
--   insertWithKey f 7 "xxx" (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a"), (7, "xxx")]
--   insertWithKey f 5 "xxx" empty                         == singleton 5 "xxx"
--
insertWithKey :: (Ord k, Binary k, Binary a) => (k -> a -> a -> a) -> k -> a -> Map k a -> Map k a -- | O(log n). Combines insert operation with old value retrieval. -- The expression (insertLookupWithKey f k x map) is a -- pair where the first element is equal to (lookup k -- map) and the second element equal to (insertWithKey f -- k x map). -- -- 
--   let f key new_value old_value = (show key) ++ ":" ++ new_value ++ "|" ++ old_value
--   insertLookupWithKey f 5 "xxx" (fromList [(5,"a"), (3,"b")]) == (Just "a", fromList [(3, "b"), (5, "5:xxx|a")])
--   insertLookupWithKey f 7 "xxx" (fromList [(5,"a"), (3,"b")]) == (Nothing,  fromList [(3, "b"), (5, "a"), (7, "xxx")])
--   insertLookupWithKey f 5 "xxx" empty                         == (Nothing,  singleton 5 "xxx")
--
-- -- This is how to define insertLookup using -- insertLookupWithKey: -- -- 
--   let insertLookup kx x t = insertLookupWithKey (\_ a _ -> a) kx x t
--   insertLookup 5 "x" (fromList [(5,"a"), (3,"b")]) == (Just "a", fromList [(3, "b"), (5, "x")])
--   insertLookup 7 "x" (fromList [(5,"a"), (3,"b")]) == (Nothing,  fromList [(3, "b"), (5, "a"), (7, "x")])
--
insertLookupWithKey :: (Ord k, Binary k, Binary a) => (k -> a -> a -> a) -> k -> a -> Map k a -> (Maybe a, Map k a) -- | O(log n). Delete a key and its value from the map. When the key -- is not a member of the map, the original map is returned. -- -- 
--   delete 5 (fromList [(5,"a"), (3,"b")]) == singleton 3 "b"
--   delete 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
--   delete 5 empty                         == empty
--
delete :: (Ord k, Binary k) => k -> Map k a -> Map k a -- | O(log n). Update a value at a specific key with the result of -- the provided function. When the key is not a member of the map, the -- original map is returned. -- -- 
--   adjust ("new " ++) 5 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "new a")]
--   adjust ("new " ++) 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
--   adjust ("new " ++) 7 empty                         == empty
--
adjust :: (Ord k, Binary k, Binary a) => (a -> a) -> k -> Map k a -> Map k a -- | O(log n). Adjust a value at a specific key. When the key is not -- a member of the map, the original map is returned. -- -- 
--   let f key x = (show key) ++ ":new " ++ x
--   adjustWithKey f 5 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "5:new a")]
--   adjustWithKey f 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
--   adjustWithKey f 7 empty                         == empty
--
adjustWithKey :: (Ord k, Binary k, Binary a) => (k -> a -> a) -> k -> Map k a -> Map k a -- | O(log n). The expression (update f k map) -- updates the value x at k (if it is in the map). If -- (f x) is Nothing, the element is deleted. If it is -- (Just y), the key k is bound to the new value -- y. -- -- 
--   let f x = if x == "a" then Just "new a" else Nothing
--   update f 5 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "new a")]
--   update f 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
--   update f 3 (fromList [(5,"a"), (3,"b")]) == singleton 5 "a"
--
update :: (Ord k, Binary k, Binary a) => (a -> Maybe a) -> k -> Map k a -> Map k a -- | O(log n). The expression (updateWithKey f k -- map) updates the value x at k (if it is in the -- map). If (f k x) is Nothing, the element is deleted. -- If it is (Just y), the key k is bound to the -- new value y. -- -- 
--   let f k x = if x == "a" then Just ((show k) ++ ":new a") else Nothing
--   updateWithKey f 5 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "5:new a")]
--   updateWithKey f 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
--   updateWithKey f 3 (fromList [(5,"a"), (3,"b")]) == singleton 5 "a"
--
updateWithKey :: (Ord k, Binary k, Binary a) => (k -> a -> Maybe a) -> k -> Map k a -> Map k a -- | O(log n). Lookup and update. See also updateWithKey. The -- function returns changed value, if it is updated. Returns the original -- key value if the map entry is deleted. -- -- 
--   let f k x = if x == "a" then Just ((show k) ++ ":new a") else Nothing
--   updateLookupWithKey f 5 (fromList [(5,"a"), (3,"b")]) == (Just "5:new a", fromList [(3, "b"), (5, "5:new a")])
--   updateLookupWithKey f 7 (fromList [(5,"a"), (3,"b")]) == (Nothing,  fromList [(3, "b"), (5, "a")])
--   updateLookupWithKey f 3 (fromList [(5,"a"), (3,"b")]) == (Just "b", singleton 5 "a")
--
updateLookupWithKey :: (Ord k, Binary k, Binary a) => (k -> a -> Maybe a) -> k -> Map k a -> (Maybe a, Map k a) -- | O(log n). The expression (alter f k map) alters -- the value x at k, or absence thereof. alter -- can be used to insert, delete, or update a value in a Map. In -- short : lookup k (alter f k m) = f (lookup k -- m). -- -- 
--   let f _ = Nothing
--   alter f 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
--   alter f 5 (fromList [(5,"a"), (3,"b")]) == singleton 3 "b"
--   
--   let f _ = Just "c"
--   alter f 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a"), (7, "c")]
--   alter f 5 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "c")]
--
alter :: (Ord k, Binary k, Binary a) => (Maybe a -> Maybe a) -> k -> Map k a -> Map k a -- | O(log n*m). The expression (union t1 t2) takes -- the left-biased union of t1 and t2. It prefers -- t1 when duplicate keys are encountered, i.e. -- (union == unionWith const). -- -- 
--   union (fromList [(5, "a"), (3, "b")]) (fromList [(5, "A"), (7, "C")]) == fromList [(3, "b"), (5, "a"), (7, "C")]
--
union :: (Ord k, Binary k, Binary a) => Map k a -> Map k a -> Map k a -- | O(log n*m). Union with a combining function. -- -- 
--   unionWith (++) (fromList [(5, "a"), (3, "b")]) (fromList [(5, "A"), (7, "C")]) == fromList [(3, "b"), (5, "aA"), (7, "C")]
--
unionWith :: (Ord k, Binary k, Binary a) => (a -> a -> a) -> Map k a -> Map k a -> Map k a -- | O(log n*m). Union with a combining function. -- -- 
--   let f key new_value old_value = (show key) ++ ":" ++ new_value ++ "|" ++ old_value
--   unionWithKey f (fromList [(5, "a"), (3, "b")]) (fromList [(5, "A"), (7, "C")]) == fromList [(3, "b"), (5, "5:a|A"), (7, "C")]
--
unionWithKey :: (Ord k, Binary k, Binary a) => (k -> a -> a -> a) -> Map k a -> Map k a -> Map k a -- | The union of a list of maps: (unions == foldl -- union empty). -- -- 
--   unions [(fromList [(5, "a"), (3, "b")]), (fromList [(5, "A"), (7, "C")]), (fromList [(5, "A3"), (3, "B3")])]
--       == fromList [(3, "b"), (5, "a"), (7, "C")]
--   unions [(fromList [(5, "A3"), (3, "B3")]), (fromList [(5, "A"), (7, "C")]), (fromList [(5, "a"), (3, "b")])]
--       == fromList [(3, "B3"), (5, "A3"), (7, "C")]
--
unions :: (Ord k, Binary k, Binary a) => [Map k a] -> Map k a -- | The union of a list of maps, with a combining operation: -- (unionsWith f == foldl (unionWith f) -- empty). -- -- 
--   unionsWith (++) [(fromList [(5, "a"), (3, "b")]), (fromList [(5, "A"), (7, "C")]), (fromList [(5, "A3"), (3, "B3")])]
--       == fromList [(3, "bB3"), (5, "aAA3"), (7, "C")]
--
unionsWith :: (Ord k, Binary k, Binary a) => (a -> a -> a) -> [Map k a] -> Map k a -- | O(n). Map a function over all values in the map. -- -- 
--   map (++ "x") (fromList [(5,"a"), (3,"b")]) == fromList [(3, "bx"), (5, "ax")]
--
map :: (Ord k, Binary k, Binary a, Binary b) => (a -> b) -> Map k a -> Map k b -- | O(n). Map a function over all values in the map. -- -- 
--   let f key x = (show key) ++ ":" ++ x
--   mapWithKey f (fromList [(5,"a"), (3,"b")]) == fromList [(3, "3:b"), (5, "5:a")]
--
mapWithKey :: (Ord k, Binary k, Binary a, Binary b) => (k -> a -> b) -> Map k a -> Map k b -- | O(n*log n). mapKeys f s is the map obtained by -- applying f to each key of s. -- -- The size of the result may be smaller if f maps two or more -- distinct keys to the same new key. In this case the value at the -- smallest of these keys is retained. -- -- 
--   mapKeys (+ 1) (fromList [(5,"a"), (3,"b")])                        == fromList [(4, "b"), (6, "a")]
--   mapKeys (\ _ -> 1) (fromList [(1,"b"), (2,"a"), (3,"d"), (4,"c")]) == singleton 1 "c"
--   mapKeys (\ _ -> 3) (fromList [(1,"b"), (2,"a"), (3,"d"), (4,"c")]) == singleton 3 "c"
--
mapKeys :: (Ord k2, Binary k1, Binary k2, Binary a) => (k1 -> k2) -> Map k1 a -> Map k2 a -- | O(n*log n). mapKeysWith c f s is the map -- obtained by applying f to each key of s. -- -- The size of the result may be smaller if f maps two or more -- distinct keys to the same new key. In this case the associated values -- will be combined using c. -- -- 
--   mapKeysWith (++) (\ _ -> 1) (fromList [(1,"b"), (2,"a"), (3,"d"), (4,"c")]) == singleton 1 "cdab"
--   mapKeysWith (++) (\ _ -> 3) (fromList [(1,"b"), (2,"a"), (3,"d"), (4,"c")]) == singleton 3 "cdab"
--
mapKeysWith :: (Ord k2, Binary k1, Binary k2, Binary a) => (a -> a -> a) -> (k1 -> k2) -> Map k1 a -> Map k2 a -- | O(n). mapKeysMonotonic f s == mapKeys f -- s, but works only when f is strictly monotonic. That is, -- for any values x and y, if x < -- y then f x < f y. The precondition is -- not checked. Semi-formally, we have: -- -- 
--   and [x < y ==> f x < f y | x <- ls, y <- ls] 
--                       ==> mapKeysMonotonic f s == mapKeys f s
--       where ls = keys s
--
-- -- This means that f maps distinct original keys to distinct -- resulting keys. This function has better performance than -- mapKeys. -- -- 
--   mapKeysMonotonic (\ k -> k * 2) (fromList [(5,"a"), (3,"b")]) == fromList [(6, "b"), (10, "a")]
--   valid (mapKeysMonotonic (\ k -> k * 2) (fromList [(5,"a"), (3,"b")])) == True
--   valid (mapKeysMonotonic (\ _ -> 1)     (fromList [(5,"a"), (3,"b")])) == False
--
mapKeysMonotonic :: (Binary k1, Binary k2, Binary a) => (k1 -> k2) -> Map k1 a -> Map k2 a -- | O(n). Fold the values in the map, such that fold f z -- == foldr f z . elems. For example, -- -- 
--   elems map = fold (:) [] map
--
-- -- 
--   let f a len = len + (length a)
--   fold f 0 (fromList [(5,"a"), (3,"bbb")]) == 4
--
fold :: (Binary k, Binary a) => (a -> b -> b) -> b -> Map k a -> b -- | O(n). Fold the keys and values in the map, such that -- foldWithKey f z == foldr (uncurry f) z . -- toAscList. For example, -- -- 
--   keys map = foldWithKey (\k x ks -> k:ks) [] map
--
-- -- 
--   let f k a result = result ++ "(" ++ (show k) ++ ":" ++ a ++ ")"
--   foldWithKey f "Map: " (fromList [(5,"a"), (3,"b")]) == "Map: (5:a)(3:b)"
--
foldWithKey :: (Binary k, Binary a) => (k -> a -> b -> b) -> b -> Map k a -> b -- | O(n). Return all elements of the map in the ascending order of -- their keys. -- -- 
--   elems (fromList [(5,"a"), (3,"b")]) == ["b","a"]
--   elems empty == []
--
elems :: (Binary k, Binary a) => Map k a -> [a] -- | O(n). Return all keys of the map in ascending order. -- -- 
--   keys (fromList [(5,"a"), (3,"b")]) == [3,5]
--   keys empty == []
--
keys :: (Binary k, Binary a) => Map k a -> [k] -- | O(n). The set of all keys of the map. -- -- 
--   keysSet (fromList [(5,"a"), (3,"b")]) == Data.Set.fromList [3,5]
--   keysSet empty == Data.Set.empty
--
keysSet :: (Ord k, Binary k, Binary a) => Map k a -> Set k -- | O(n). Return all key/value pairs in the map in ascending key -- order. -- -- 
--   assocs (fromList [(5,"a"), (3,"b")]) == [(3,"b"), (5,"a")]
--   assocs empty == []
--
assocs :: (Binary k, Binary a) => Map k a -> [(k, a)] -- | O(n). Convert to a list of key/value pairs. -- -- 
--   toList (fromList [(5,"a"), (3,"b")]) == [(3,"b"), (5,"a")]
--   toList empty == []
--
toList :: (Binary k, Binary a) => Map k a -> [(k, a)] -- | O(n*log n). Build a map from a list of key/value pairs. See -- also fromAscList. If the list contains more than one value for -- the same key, the last value for the key is retained. -- -- 
--   fromList [] == empty
--   fromList [(5,"a"), (3,"b"), (5, "c")] == fromList [(5,"c"), (3,"b")]
--   fromList [(5,"c"), (3,"b"), (5, "a")] == fromList [(5,"a"), (3,"b")]
--
fromList :: (Ord k, Binary k, Binary a) => [(k, a)] -> Map k a -- | O(n*log n). Build a map from a list of key/value pairs with a -- combining function. See also fromAscListWith. -- -- 
--   fromListWith (++) [(5,"a"), (5,"b"), (3,"b"), (3,"a"), (5,"a")] == fromList [(3, "ab"), (5, "aba")]
--   fromListWith (++) [] == empty
--
fromListWith :: (Ord k, Binary k, Binary a) => (a -> a -> a) -> [(k, a)] -> Map k a -- | O(n*log n). Build a map from a list of key/value pairs with a -- combining function. See also fromAscListWithKey. -- -- 
--   let f k a1 a2 = (show k) ++ a1 ++ a2
--   fromListWithKey f [(5,"a"), (5,"b"), (3,"b"), (3,"a"), (5,"a")] == fromList [(3, "3ab"), (5, "5a5ba")]
--   fromListWithKey f [] == empty
--
fromListWithKey :: (Ord k, Binary k, Binary a) => (k -> a -> a -> a) -> [(k, a)] -> Map k a -- | O(n). Convert to an ascending list. -- -- 
--   toAscList (fromList [(5,"a"), (3,"b")]) == [(3,"b"), (5,"a")]
--
toAscList :: (Binary k, Binary a) => Map k a -> [(k, a)] -- | O(n). Build a map from an ascending list in linear time. The -- precondition (input list is ascending) is not checked. -- -- 
--   fromAscList [(3,"b"), (5,"a")]          == fromList [(3, "b"), (5, "a")]
--   fromAscList [(3,"b"), (5,"a"), (5,"b")] == fromList [(3, "b"), (5, "b")]
--   valid (fromAscList [(3,"b"), (5,"a"), (5,"b")]) == True
--   valid (fromAscList [(5,"a"), (3,"b"), (5,"b")]) == False
--
fromAscList :: (Eq k, Binary k, Binary a) => [(k, a)] -> Map k a -- | O(n). Build a map from an ascending list in linear time with a -- combining function for equal keys. The precondition (input list is -- ascending) is not checked. -- -- 
--   fromAscListWith (++) [(3,"b"), (5,"a"), (5,"b")] == fromList [(3, "b"), (5, "ba")]
--   valid (fromAscListWith (++) [(3,"b"), (5,"a"), (5,"b")]) == True
--   valid (fromAscListWith (++) [(5,"a"), (3,"b"), (5,"b")]) == False
--
fromAscListWith :: (Eq k, Binary k, Binary a) => (a -> a -> a) -> [(k, a)] -> Map k a -- | O(n). Build a map from an ascending list in linear time with a -- combining function for equal keys. The precondition (input list is -- ascending) is not checked. -- -- 
--   let f k a1 a2 = (show k) ++ ":" ++ a1 ++ a2
--   fromAscListWithKey f [(3,"b"), (5,"a"), (5,"b"), (5,"b")] == fromList [(3, "b"), (5, "5:b5:ba")]
--   valid (fromAscListWithKey f [(3,"b"), (5,"a"), (5,"b"), (5,"b")]) == True
--   valid (fromAscListWithKey f [(5,"a"), (3,"b"), (5,"b"), (5,"b")]) == False
--
fromAscListWithKey :: (Eq k, Binary k, Binary a) => (k -> a -> a -> a) -> [(k, a)] -> Map k a -- | O(n). Build a map from an ascending list of distinct elements -- in linear time. The precondition is not checked. -- -- 
--   fromDistinctAscList [(3,"b"), (5,"a")] == fromList [(3, "b"), (5, "a")]
--   valid (fromDistinctAscList [(3,"b"), (5,"a")])          == True
--   valid (fromDistinctAscList [(3,"b"), (5,"a"), (5,"b")]) == False
--
fromDistinctAscList :: (Binary k, Binary a) => [(k, a)] -> Map k a -- | O(n). Filter all values that satisfy the predicate. -- -- 
--   filter (> "a") (fromList [(5,"a"), (3,"b")]) == singleton 3 "b"
--   filter (> "x") (fromList [(5,"a"), (3,"b")]) == empty
--   filter (< "a") (fromList [(5,"a"), (3,"b")]) == empty
--
filter :: (Ord k, Binary k, Binary a) => (a -> Bool) -> Map k a -> Map k a -- | O(n). Filter all keys/values that satisfy the predicate. -- -- 
--   filterWithKey (\k _ -> k > 4) (fromList [(5,"a"), (3,"b")]) == singleton 5 "a"
--
filterWithKey :: (Ord k, Binary k, Binary a) => (k -> a -> Bool) -> Map k a -> Map k a -- | O(n). Partition the map according to a predicate. The first map -- contains all elements that satisfy the predicate, the second all -- elements that fail the predicate. See also split. -- -- 
--   partition (> "a") (fromList [(5,"a"), (3,"b")]) == (singleton 3 "b", singleton 5 "a")
--   partition (< "x") (fromList [(5,"a"), (3,"b")]) == (fromList [(3, "b"), (5, "a")], empty)
--   partition (> "x") (fromList [(5,"a"), (3,"b")]) == (empty, fromList [(3, "b"), (5, "a")])
--
partition :: (Ord k, Binary k, Binary a) => (a -> Bool) -> Map k a -> (Map k a, Map k a) -- | O(n). Partition the map according to a predicate. The first map -- contains all elements that satisfy the predicate, the second all -- elements that fail the predicate. See also split. -- -- 
--   partitionWithKey (\ k _ -> k > 3) (fromList [(5,"a"), (3,"b")]) == (singleton 5 "a", singleton 3 "b")
--   partitionWithKey (\ k _ -> k < 7) (fromList [(5,"a"), (3,"b")]) == (fromList [(3, "b"), (5, "a")], empty)
--   partitionWithKey (\ k _ -> k > 7) (fromList [(5,"a"), (3,"b")]) == (empty, fromList [(3, "b"), (5, "a")])
--
partitionWithKey :: (Ord k, Binary k, Binary a) => (k -> a -> Bool) -> Map k a -> (Map k a, Map k a) -- | O(n). Map values and collect the Just results. -- -- 
--   let f x = if x == "a" then Just "new a" else Nothing
--   mapMaybe f (fromList [(5,"a"), (3,"b")]) == singleton 5 "new a"
--
mapMaybe :: (Ord k, Binary k, Binary a, Binary b) => (a -> Maybe b) -> Map k a -> Map k b -- | O(n). Map keys/values and collect the Just results. -- -- 
--   let f k _ = if k < 5 then Just ("key : " ++ (show k)) else Nothing
--   mapMaybeWithKey f (fromList [(5,"a"), (3,"b")]) == singleton 3 "key : 3"
--
mapMaybeWithKey :: (Ord k, Binary k, Binary a, Binary b) => (k -> a -> Maybe b) -> Map k a -> Map k b -- | O(n). Map values and separate the Left and Right -- results. -- -- 
--   let f a = if a < "c" then Left a else Right a
--   mapEither f (fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")])
--       == (fromList [(3,"b"), (5,"a")], fromList [(1,"x"), (7,"z")])
--   
--   mapEither (\ a -> Right a) (fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")])
--       == (empty, fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")])
--
mapEither :: (Ord k, Binary k, Binary a, Binary b, Binary c) => (a -> Either b c) -> Map k a -> (Map k b, Map k c) -- | O(n). Map keys/values and separate the Left and -- Right results. -- -- 
--   let f k a = if k < 5 then Left (k * 2) else Right (a ++ a)
--   mapEitherWithKey f (fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")])
--       == (fromList [(1,2), (3,6)], fromList [(5,"aa"), (7,"zz")])
--   
--   mapEitherWithKey (\_ a -> Right a) (fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")])
--       == (empty, fromList [(1,"x"), (3,"b"), (5,"a"), (7,"z")])
--
mapEitherWithKey :: (Ord k, Binary k, Binary a, Binary c, Binary b) => (k -> a -> Either b c) -> Map k a -> (Map k b, Map k c) instance Typeable2 Map instance Show Range instance (Ord k, Binary k, Binary a) => Monoid (Map k a) instance Binary (Map k a) instance (Ord k, Binary k, Binary a, Read k, Read a) => Read (Map k a) instance (Binary k, Binary a, Show k, Show a) => Show (Map k a) instance (Ord k, Ord a, Binary k, Binary a) => Ord (Map k a) instance (Eq k, Eq a, Binary k, Binary a) => Eq (Map k a)