lens-1.1: Families of Lenses, Folds and Traversals
Data.IntSet.Lens
Description
Synopsis
contains :: Int -> Simple Lens IntSet BoolSource
This Lens can be used to read, write or delete a member of an IntSet
Lens
IntSet
ghci> contains 3 +~ False $ fromList [1,2,3,4] fromList [1,2,4]
contains :: Int -> (Bool -> f Bool) -> IntSet -> f IntSet