{-# LANGUAGE CPP #-} {-# LANGUAGE BangPatterns #-} #if __GLASGOW_HASKELL__ >= 703 {-# LANGUAGE Safe #-} #endif #include "containers.h" ----------------------------------------------------------------------------- -- | -- Module : Data.Map.Strict -- Copyright : (c) Daan Leijen 2002 -- (c) Andriy Palamarchuk 2008 -- License : BSD-style -- Maintainer : [email protected] -- Portability : portable -- -- -- = Finite Maps (strict interface) -- -- The @'Map' k v@ type represents a finite map (sometimes called a dictionary) -- from keys of type @k@ to values of type @v@. -- -- Each function in this module is careful to force values before installing -- them in a 'Map'. This is usually more efficient when laziness is not -- necessary. When laziness /is/ required, use the functions in "Data.Map.Lazy". -- -- In particular, the functions in this module obey the following law: -- -- - If all values stored in all maps in the arguments are in WHNF, then all -- values stored in all maps in the results will be in WHNF once those maps -- are evaluated. -- -- When deciding if this is the correct data structure to use, consider: -- -- * If you are using 'Int' keys, you will get much better performance for most -- operations using "Data.IntMap.Strict". -- -- * If you don't care about ordering, consider use @Data.HashMap.Strict@ from the -- <https://hackage.haskell.org/package/unordered-containers unordered-containers> -- package instead. -- -- For a walkthrough of the most commonly used functions see the -- <https://haskell-containers.readthedocs.io/en/latest/map.html maps introduction>. -- -- This module is intended to be imported qualified, to avoid name clashes with -- Prelude functions: -- -- > import qualified Data.Map.Strict as Map -- -- Note that the implementation is generally /left-biased/. Functions that take -- two maps as arguments and combine them, such as `union` and `intersection`, -- prefer the values in the first argument to those in the second. -- -- -- == Detailed performance information -- -- The amortized running time is given for each operation, with /n/ referring to -- the number of entries in the map. -- -- Benchmarks comparing "Data.Map.Strict" with other dictionary implementations -- can be found at https://github.com/haskell-perf/dictionaries. -- -- -- == Warning -- -- The size of a 'Map' must not exceed @maxBound::Int@. Violation of this -- condition is not detected and if the size limit is exceeded, its behaviour is -- undefined. -- -- The 'Map' type is shared between the lazy and strict modules, meaning that -- the same 'Map' value can be passed to functions in both modules. This means -- that the 'Functor', 'Traversable' and 'Data' instances are the same as for -- the "Data.Map.Lazy" module, so if they are used on strict maps, the resulting -- maps may contain suspended values (thunks). -- -- -- == Implementation -- -- The implementation of 'Map' is based on /size balanced/ binary trees (or -- trees of /bounded balance/) as described by: -- -- * Stephen Adams, \"/Efficient sets: a balancing act/\", -- Journal of Functional Programming 3(4):553-562, October 1993, -- <http://www.swiss.ai.mit.edu/~adams/BB/>. -- * J. Nievergelt and E.M. Reingold, -- \"/Binary search trees of bounded balance/\", -- SIAM journal of computing 2(1), March 1973. -- -- Bounds for 'union', 'intersection', and 'difference' are as given -- by -- -- * Guy Blelloch, Daniel Ferizovic, and Yihan Sun, -- \"/Just Join for Parallel Ordered Sets/\", -- <https://arxiv.org/abs/1602.02120v3>. -- -- ----------------------------------------------------------------------------- -- See the notes at the beginning of Data.Map.Internal. module Data.Map.Strict ( -- * Map type Map -- instance Eq,Show,Read -- * Operators , (!), (!?), (\\) -- * Query , null , size , member , notMember , lookup , findWithDefault , lookupLT , lookupGT , lookupLE , lookupGE -- * Construction , empty , singleton -- ** Insertion , insert , insertWith , insertWithKey , insertLookupWithKey -- ** Delete\/Update , delete , adjust , adjustWithKey , update , updateWithKey , updateLookupWithKey , alter , alterF -- * Combine -- ** Union , union , unionWith , unionWithKey , unions , unionsWith -- ** Difference , difference , differenceWith , differenceWithKey -- ** Intersection , intersection , intersectionWith , intersectionWithKey -- ** General combining functions -- | See "Data.Map.Merge.Strict" -- ** Deprecated general combining function , mergeWithKey -- * Traversal -- ** Map , map , mapWithKey , traverseWithKey , traverseMaybeWithKey , mapAccum , mapAccumWithKey , mapAccumRWithKey , mapKeys , mapKeysWith , mapKeysMonotonic -- * Folds , foldr , foldl , foldrWithKey , foldlWithKey , foldMapWithKey -- ** 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 , fromDescList , fromDescListWith , fromDescListWithKey , fromDistinctDescList -- * Filter , filter , filterWithKey , restrictKeys , withoutKeys , partition , partitionWithKey , takeWhileAntitone , dropWhileAntitone , spanAntitone , mapMaybe , mapMaybeWithKey , mapEither , mapEitherWithKey , split , splitLookup , splitRoot -- * Submap , isSubmapOf, isSubmapOfBy , isProperSubmapOf, isProperSubmapOfBy -- * Indexed , lookupIndex , findIndex , elemAt , updateAt , deleteAt , take , drop , splitAt -- * Min\/Max , lookupMin , lookupMax , findMin , findMax , deleteMin , deleteMax , deleteFindMin , deleteFindMax , updateMin , updateMax , updateMinWithKey , updateMaxWithKey , minView , maxView , minViewWithKey , maxViewWithKey -- * Debugging , showTree , showTreeWith , valid ) where import Data.Map.Strict.Internal import Prelude ()