[Haskell-beginners] Return a Foldable instance

[Ozgur Akgun]

On 4 May 2011 07:25, Federico Mastellone <fmaste at gmail.com> wrote:

> Because the underlying structure is already Foldable, so why creating
> a dummy function for every method on the Foldable class that only
> calls the same function but in the underlying structure.


If you make your MultiMap type and instance of Foldable, you get *every
method on the Foldable class* for free anyway. Namely, you do not need to
replicate functions with a Foldable constraint with your MultiMap data type.

HTH,

--
Ozgur Akgun
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