[Haskell-cafe] Layered maps

Thomas DuBuisson thomas.dubuisson at gmail.com
Fri Oct 8 17:46:14 EDT 2010


The containers library can do this already - there are no constraints
on the elements of a Map.  For example:

> type TripleNestedMap a = Map Int (Map Char (Map String a))

But this is rather silly as you can just do:

> type MapOfTriples a = Map (Int ,Char, String) a

for most uses.


On Fri, Oct 8, 2010 at 2:23 PM, Alex Rozenshteyn <rpglover64 at gmail.com> wrote:
> Does there exist a library which allows me to have maps whose elements are
> maps whose elements ... with a convenient syntax.
> Alternatively, does there exist a library like Data.Tree where forests are
> sets rather than lists?
> --
>           Alex R
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