[Haskell-cafe] How to variables
robdockins at fastmail.fm
Tue Jul 19 12:57:57 EDT 2005
>>Some people may suggest that you to create top-level IORefs using
>>unsafePerformIO, but I don't recommend that for this situation.
> Well I can't imagine which particular people you have in mind :-)
> But, as a vocal advocate of sound support for top level mutable
> state, I would just like to go on record as saying I certainly
> would not advocate it for this problem.
> But then again, I wouldn't advocate the use of explicit "entire
> program state" record passing either :-)
Fair enough. The main reason I suggested it is a fairly painless way to
emulate global variables within a main control loop, which was the OPs
stated goal. ("it's important to implement it in as most imperative
form as possible...")
I would personally attempt to adopt a more functional way of approaching
the problem (Arrows and whatnot), but those are still pretty murky waters.
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