{-# LANGUAGE CPP #-}
#if defined(__GLASGOW_HASKELL__)
{-# LANGUAGE Safe #-}
#endif

#include "containers.h"
------------------------------------------------------------------------------- |-- Module : Data.Map.Merge.Lazy-- Copyright : (c) David Feuer 2016-- License : BSD-style-- Maintainer : libraries@haskell.org-- Portability : portable---- This module defines an API for writing functions that merge two-- maps. The key functions are 'merge' and 'mergeA'.-- Each of these can be used with several different \"merge tactics\".---- The 'merge' and 'mergeA' functions are shared by-- the lazy and strict modules. Only the choice of merge tactics-- determines strictness. If you use 'Data.Map.Merge.Strict.mapMissing'-- from "Data.Map.Merge.Strict" then the results will be forced before-- they are inserted. If you use 'Data.Map.Merge.Lazy.mapMissing' from-- this module then they will not.---- == Efficiency note---- The 'Control.Category.Category', 'Applicative', and 'Monad' instances for-- 'WhenMissing' tactics are included because they are valid. However, they are-- inefficient in many cases and should usually be avoided. The instances-- for 'WhenMatched' tactics should not pose any major efficiency problems.---- @since 0.5.9moduleData.Map.Merge.Lazy(-- ** Simple merge tactic typesSimpleWhenMissing ,SimpleWhenMatched -- ** General combining function,merge -- *** @WhenMatched@ tactics,zipWithMaybeMatched ,zipWithMatched -- *** @WhenMissing@ tactics,mapMaybeMissing ,dropMissing ,preserveMissing ,mapMissing ,filterMissing -- ** Applicative merge tactic types,WhenMissing ,WhenMatched -- ** Applicative general combining function,mergeA -- *** @WhenMatched@ tactics-- | The tactics described for 'merge' work for-- 'mergeA' as well. Furthermore, the following-- are available.,zipWithMaybeAMatched ,zipWithAMatched -- *** @WhenMissing@ tactics-- | The tactics described for 'merge' work for-- 'mergeA' as well. Furthermore, the following-- are available.,traverseMaybeMissing ,traverseMissing ,filterAMissing -- *** Covariant maps for tactics,mapWhenMissing ,mapWhenMatched -- *** Contravariant maps for tactics,lmapWhenMissing ,contramapFirstWhenMatched ,contramapSecondWhenMatched -- *** Miscellaneous tactic functions,runWhenMatched ,runWhenMissing )whereimportData.Map.Internal