While working on SAT-Britney, I made heavy use of the IntSet data type provided by the basic Haskell library “containers”. Since memory consumption was a problem, I looked at its implementation, which is a binary tree, and wondered whether this could be improved for dense sets by using a machine sized word as a bit map to represent a continuous part of the integers, so I started to implement it. The effect on my program was not as strong as I had hoped for, but nevertheless, the code made its way back into containers – after a thorough review and a considerable amount of further improvements by Milan Straka. I’m getting sucked deeper and deeper into the Haskell community... (which means that the Haskell community does not suck, of course.)
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