Adrian Hey writes:
Perhaps you would like to show me your solution to the "oneShot" problem.
I don't see any value in problems that are specifically designed so that they can be solved only with a global entity. What is the real-world application for oneShot?
If this is such a wacky idea then why is the use of the unsafePerformIO hack to do precisely this so common place?
Because programmers tend to be lazy. I like Haskell because it doesn't _allow_ me to be lazy.
I gather it's even used within ghc. If the two Simons don't know how to write "proper" Haskell, what hope is there for the rest of us.
Nobody said that. Use of unsafePerformIO does not equal bad code.
But why would it be a problem if it was not?
Because code like that is very hard to get right and very hard to maintain, and I don't want to use library code that uses this technique if I can avoid it. I'll be readily convinced of the opposite once I see code that makes good use of this. Peter