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GHC 9.14.1 · lts/ghc-9.14.x · 7a6c33e · 2026-10-12

  • Packageghc-9.14.1
  • Exports40
  • LanguageGHC2021
  • LicenceBSD-3-Clause
  • SourceMap.hs
newtypenewtype UniqMap k a

Maps indexed by Uniquable keys

Constructors

Instances8Functor, Eq, Data, Semigroup, Monoid, NFData, …
valueaddToUniqMap_L
  1. :: Uniquable k
  2. => k -> a -> a -> a
  3. -> k
  4. -> a
  5. -> UniqMap k a
  6. -> (Maybe a, UniqMap k a)

Add an element, returns previous lookup result and new map. If old element doesn't exist, add the passed element directly, otherwise compute the element to add using the passed function.