{-# LANGUAGE CPP #-} #if !defined(TESTING) && __GLASGOW_HASKELL__ >= 703 {-# LANGUAGE Trustworthy #-} #endif ----------------------------------------------------------------------------- -- | -- Module : Data.IntMap.Lazy -- Copyright : (c) Daan Leijen 2002 -- (c) Andriy Palamarchuk 2008 -- License : BSD-style -- Maintainer : libraries@haskell.org -- Stability : provisional -- Portability : portable -- -- An efficient implementation of maps from integer keys to values -- (dictionaries). -- -- API of this module is strict in the keys, but lazy in the values. -- If you need value-strict maps, use 'Data.IntMap.Strict' instead. -- The 'IntMap' type itself is shared between the lazy and strict modules, -- meaning that the same 'IntMap' value can be passed to functions in -- both modules (although that is rarely needed). -- -- These modules are intended to be imported qualified, to avoid name -- clashes with Prelude functions, e.g. -- -- > import Data.IntMap.Lazy (IntMap) -- > import qualified Data.IntMap.Lazy as IntMap -- -- The implementation is based on /big-endian patricia trees/. This data -- structure performs especially well on binary operations like 'union' -- and 'intersection'. However, my benchmarks show that it is also -- (much) faster on insertions and deletions when compared to a generic -- size-balanced map implementation (see "Data.Map"). -- -- * Chris Okasaki and Andy Gill, \"/Fast Mergeable Integer Maps/\", -- Workshop on ML, September 1998, pages 77-86, -- <http://citeseer.ist.psu.edu/okasaki98fast.html> -- -- * D.R. Morrison, \"/PATRICIA -- Practical Algorithm To Retrieve -- Information Coded In Alphanumeric/\", Journal of the ACM, 15(4), -- October 1968, pages 514-534. -- -- Operation comments contain the operation time complexity in -- the Big-O notation <http://en.wikipedia.org/wiki/Big_O_notation>. -- Many operations have a worst-case complexity of /O(min(n,W))/. -- This means that the operation can become linear in the number of -- elements with a maximum of /W/ -- the number of bits in an 'Int' -- (32 or 64). ----------------------------------------------------------------------------- module Data.IntMap.Lazy ( -- * Strictness properties -- $strictness -- * Map type #if !defined(TESTING) IntMap, Key -- instance Eq,Show #else IntMap(..), Key -- instance Eq,Show #endif -- * Operators , (!), (\\) -- * Query , IM.null , size , member , notMember , IM.lookup , findWithDefault , lookupLT , lookupGT , lookupLE , lookupGE -- * Construction , empty , singleton -- ** Insertion , insert , insertWith , insertWithKey , insertLookupWithKey -- ** Delete\/Update , delete , adjust , adjustWithKey , update , updateWithKey , updateLookupWithKey , alter -- * Combine -- ** Union , union , unionWith , unionWithKey , unions , unionsWith -- ** Difference , difference , differenceWith , differenceWithKey -- ** Intersection , intersection , intersectionWith , intersectionWithKey -- ** Universal combining function , mergeWithKey -- * Traversal -- ** Map , IM.map , mapWithKey , traverseWithKey , mapAccum , mapAccumWithKey , mapAccumRWithKey , mapKeys , mapKeysWith , mapKeysMonotonic -- * Folds , IM.foldr , IM.foldl , foldrWithKey , foldlWithKey -- ** Strict folds , foldr' , foldl' , foldrWithKey' , foldlWithKey' -- * Conversion , elems , keys , assocs , keysSet , fromSet -- ** Lists , toList , fromList , fromListWith , fromListWithKey -- ** Ordered lists , toAscList , toDescList , fromAscList , fromAscListWith , fromAscListWithKey , fromDistinctAscList -- * Filter , IM.filter , filterWithKey , partition , partitionWithKey , mapMaybe , mapMaybeWithKey , mapEither , mapEitherWithKey , split , splitLookup -- * Submap , isSubmapOf, isSubmapOfBy , isProperSubmapOf, isProperSubmapOfBy -- * Min\/Max , findMin , findMax , deleteMin , deleteMax , deleteFindMin , deleteFindMax , updateMin , updateMax , updateMinWithKey , updateMaxWithKey , minView , maxView , minViewWithKey , maxViewWithKey -- * Debugging , showTree , showTreeWith ) where import Data.IntMap.Base as IM -- $strictness -- -- This module satisfies the following strictness property: -- -- * Key arguments are evaluated to WHNF -- -- Here are some examples that illustrate the property: -- -- > insertWith (\ new old -> old) undefined v m == undefined -- > insertWith (\ new old -> old) k undefined m == OK -- > delete undefined m == undefined