[Haskell-cafe] Implicit Multi Threading in Switch Case
yotam2206 at gmail.com
Tue Jun 20 09:28:15 UTC 2017
After reading "Push-Pull Functional Reactive Programming
I had an idea about deciding which, of two events, comes first. Instead of
using forkIO, I tried something like the following:
infi :: Maybe Int
infi = infi
stop :: Maybe Int
stop = Nothing
test :: Int
test = case (infi, stop) of
(Nothing, Just _) -> 1
(_, _) -> 2
Here, infi is an action that never ends, and stop a function that ends
immediately. I thought that the compiler would see that stop evaluates
immediately to Nothing and thus will return 2, but it tries to evaluate
infi and get stuck.
I think it happens because I am using a tuple to hold both values (but not
really sure about it). Do you know a way to make this arrangement work?
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