[Haskell-cafe] unsafePerformIO: are we safe?
dpiponi at gmail.com
Wed Sep 26 17:28:36 EDT 2007
On 9/26/07, Lennart Augustsson <lennart at augustsson.net> wrote:
> Things can go arbitrarily wrong if you misuse unsafePerformIO, you can even
> subvert the type system.
So...if I was in a subversive kind of mood (speaking hypothetically),
what would I have to do?
> On 9/26/07, Jorge Marques Pelizzoni < jpeliz at icmc.usp.br> wrote:
> > Hi, all!
> > This is a newbie question: I sort of understand what unsafePerformIO does
> > but I don't quite get its consequences. In short: how safe can one be in
> > face of it? I mean, conceptually, it allows any Haskell function to have
> > side effects just as in any imperative language, doesn't it? Doesn't it
> > blow up referential transparency for good? Is there anything intrinsic to
> > it that still keeps Haskell "sound" no matter what unsafePerformIO users
> > do (unlikely) or else what are the guidelines we should follow when using
> > it?
> > Thanks in advance. Cheers,
> > Jorge.
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