[Haskell-cafe] Combining State and List Monads
Henry Laxen
nadine.and.henry at pobox.com
Sat Aug 25 06:35:37 CEST 2012
Dear Cafe,
It seems to me there should be some simple way of doing this, but thus
far it eludes me. I am trying to combine the State and List monads to
do the following:
countCalls = do
a <- [1..2]
b <- [1..2]
modify (+1)
return (a,b)
where with some combination of ListT, StateT, List, State, or who
knows what would result in:
([(1,1),(1,2),(2,1),(2,2)],4)
assuming we initialize the state to 0
Is there any way to make this happen?
Thanks in advance.
Henry Laxen
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