Chris Kuklewicz wrote:
I have posted this useful wrapper on the Haskell wiki at http://haskell.org/haskellwiki/EnumSet_EnumMap
In my opinion, this is important enough that IntMap and IntSet should be deprecated from the standard libraries in favor of EnumMap and EnumSet. Besides the obvious advantage of a huge increase in generality at no performance cost (I think), there is another reason. The difference in interface been the Int and non-Int versions of Set and Map forces you to make an early decision about which to use. That decision get pervasively hard-wired into your code. The result is that it is sometimes hard to write flexible polymorphic Haskell while still reserving the option of switching to Int as an optimization. Chris' idea fixes that problem. Regards, Yitz