containers-0.5.0.0: Assorted concrete container types

Portabilityportable
Stabilityprovisional
Maintainerlibraries@haskell.org
Safe HaskellTrustworthy

Data.IntMap

Description

An efficient implementation of maps from integer keys to values (dictionaries).

This module re-exports the value lazy Lazy API, plus several value strict functions from Strict.

These modules are intended to be imported qualified, to avoid name clashes with Prelude functions, e.g.

  import Data.IntMap (IntMap)
  import qualified Data.IntMap 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).

Synopsis

Documentation

insertWith' :: (a -> a -> a) -> Key -> a -> IntMap a -> IntMap aSource

Deprecated. As of version 0.5, replaced by insertWith.

O(log n). Same as insertWith, but the combining function is applied strictly. This function is deprecated, use insertWith in Data.IntMap.Strict instead.

insertWithKey' :: (Key -> a -> a -> a) -> Key -> a -> IntMap a -> IntMap aSource

Deprecated. As of version 0.5, replaced by insertWithKey.

O(log n). Same as insertWithKey, but the combining function is applied strictly. This function is deprecated, use insertWithKey in Data.IntMap.Strict instead.

fold :: (a -> b -> b) -> b -> IntMap a -> bSource

Deprecated. As of version 0.5, replaced by foldr.

O(n). Fold the values in the map using the given right-associative binary operator. This function is an equivalent of foldr and is present for compatibility only.

foldWithKey :: (Int -> a -> b -> b) -> b -> IntMap a -> bSource

Deprecated. As of version 0.5, replaced by foldrWithKey.

O(n). Fold the keys and values in the map using the given right-associative binary operator. This function is an equivalent of foldrWithKey and is present for compatibility only.