On Thu, Jan 15, 2009 at 12:38 PM, Duncan Coutts <duncan.cou...@worc.ox.ac.uk > 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 > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe >
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