Re: [Haskell-cafe] Announce: EnumMap-0.0.1

On Mon, Aug 10, 2009 at 03:24:36PM +0200, Ketil Malde wrote:

John Van Enk writes:

...

EnumMap is a generalization of IntMap that constrains the key to Enum rather than forcing it to be Int. I have no idea what impact this has on performance,

Will it have an impact on correctness? There are some funky Enum instances around:

IMO it's implicit that keys overwrite eachother whenever their 'fromEnum' is equal, however that may be spoken in the docs. Depending on what you want you may or may not desire to have this behaviour, but this is how this data structure works. So, yes, it's correct, just different. :) -- Felipe.