HORIZON HASKELLDocslts/ghc-10.0.x8174fa42026-10-11Search names, modules, packages, or :: a typeCtrl K

GHC 10.0.0.20260917 · lts/ghc-10.0.x · 8174fa4 · 2026-10-11

Moduleghc-10.0.0.20260917GHC2024

GHC.Types.Unique.Map

  • 1 type
  • 39 values
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.