mappings-0.2.1.0: Types which represent functions k -> v
Safe HaskellSafe-Inferred
LanguageGHC2021

Data.Mapping.Util

Synopsis

Documentation

insertIfAbsent :: Ord k => k -> v -> Map k v -> (v, Maybe (Map k v)) Source #

inserts key with value only if absent, returns map if changed

nonDefault :: Eq a => a -> a -> Maybe a Source #

For use in maps where we don't want to store default values

equating :: Eq a => (b -> a) -> b -> b -> Bool Source #

Helper function (not exported)