modeling out of memory
Mon, 3 Mar 2003 11:12:21 +0200
> > Greetings,
> > 1) How does one model "out of memory" condition in Haskell, perhaps
using a Maybe type?
> Unfortuntely not since it would not be referentially transparent. It's
> part of a more general issue of exceptions in pure code.
> You can't have
> calculateSomething :: X -> Maybe Y
> Such that it returns Nothing if it ran out of memory.
> Probably the thing to do is just catch the exceptions rather than have
> your functions return Maybe types. That way you don't have to deal with
> Maybes all over the place.
Does this make the use of Monads doubtful? I mean it doesn't seem easy to
have a completely pure language, and the time one starts introducing few
impurities one also starts thinking why not include many others?
Just a thought...