Proposal: Add `restriction` to Data.Map and Data.IntMap

[Andreas Abel]

+1.

On 14.07.2016 06:45, David Feuer wrote:
> Cale Gibbard proposes the following:
>
> Data.IntMap.restriction :: IntSet -> IntMap a -> IntMap a
> Data.Map.restriction :: Ord k => Set k -> Map k a -> Map k a
>
> In each case, the map is filtered to contain only the keys that are
> also found in the set. This can be implemented efficiently using a
> slightly stripped-down version of Data.Map.intersection.
>
> David Feuer
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Andreas Abel  <><      Du bist der geliebte Mensch.

Department of Computer Science and Engineering
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