On Thu, Jan 15, 2009 at 12:38 PM, Duncan Coutts wrote: On Thu, 2009-01-15 at 19:46 +0000, Andrew Coppin wrote: PS. As a small aside... Is the Monoid class actually used *anywhere* in
all of Haskell? Yes. They're used quite a lot in Cabal. Package databases are monoids.
Configuration files are monoids. Command line flags and sets of command
line flags are monoids. Package build information is a monoid. It is also used in the Foldable class which is a nice interface for
traversing/visiting structures. Binary serialisation is also a monoid. The Writer Monad requires that you give it a Monoid for it to do its work
properly. Duncan _______________________________________________
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