NSNotFound is defined as NSIntegerMax, which is defined as LONG_MAX.
NSRange.location is defined as a NSUInteger.
Some Foundation methods return an NSRange whose location value is NSNotFound.
So, one often does this comparison:
if (aRange.location == NSNotFound)
But isn't that a comparison between signed and unsigned integers that should generate a warning?
You are comparing an unsigned (64 bit) variable with a signed constant which also fits into the range of the variable (it is not negative). So no need for a warning.
The warnings appear typically when comparing against negative constants or variables on both sides (i.e. one part is or can be negative while the other is only positive or zero).
A side note: NSNotFound is different on 32 bit vs 64 bit platforms, so don't hardcode or store that value anywhere.
