instance Applicative Data.Map

[Jake McArthur]

Sorry for the double send, Henning. I forgot the list.

http://hackage.haskell.org/packages/archive/total-map/0.0.4/doc/html/Data-TotalMap.html


On Wed, Nov 14, 2012 at 2:46 PM, Henning Thielemann <
lemming at henning-thielemann.de> wrote:

>
> An ZipList-like Applicative instance for Data.Map would be nice. I have an
> application where I like to write
>    liftA3 f amap bmap cmap
>  meaning
>    Map.intersectionWith ($) (Map.intersectionWith f amap bmap) cmap
>
> But I cannot complete the instance implementation because there is no
> sensible definition for 'pure' for Data.Map. :-(
>
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