On Fri, Jan 16, 2009 at 12:00:40PM -0500, David Menendez wrote: > A reference to the writer monad and to Data.Foldable might be helpful. > So far as I know they are the only uses of the Monoid abstraction in > the standard libraries. > > It's probably a good idea to explicitly state the three monoid laws.
I've added the laws. > It would be nice to explain what operations have been chosen for the > Monoid instances of Prelude data types. (Maybe this belongs in the > Prelude documentation.) The right place for that is the instances, as soon as Haddock starts showing instance comments (http://trac.haskell.org/haddock/ticket/29). Then this information will be listed under both the type and the class. > I'd add a reminder that if you're defining a type with a Monoid > instance, your documentation should explain what the instance does. When that Haddock enhancement is done, this will be general advice for instances of all classes. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
