David Abrahams wrote:
on Sat Dec 20 2008, Mika Heiskanen
wrote: David Abrahams wrote:
Exceptions should almost never be used in response to broken invariants. Pardon my ignorance, but how come? The constraints I have to validate usually concern broken user input
That's not a broken invariant. A broken invariant means your program is broken.
via the command line or a query string. How should I deal with them if not with exceptions? Or to be more precise, why should I not use constrained types for validating user input if it saves me a lot of if-statements in the long run?
I would never argue that you shouldn't do that.
So you see why I would prefer the constrained value class being reviewed to throw? Also, pardon my ignorance again, but would you care to explain how an expert would handle broken invariants in broken programs if not via exceptions? I was not aware there is a better solution. Regards, --> Mika Heiskanen