Recipes on how to supress / fix "Implicit conversion changes signedness" warning

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I'm modernizing a legacy project and I enabled -Wconversion flag on Xcode. Now I have a lot of warning like

Implicit conversion changes signedness: 'NSUInteger' (aka 'unsigned long') to 'NSInteger' (aka 'long')

using code like the following while interacting with a UITableView

Item *item = [self.items objectAtIndex:indexPath.row];

row is defined as NSInteger while objectAtIndex: accepts an NSUInteger.

Is there a smart way to fix those warnings?

Either change the type of the row property to return NSUInteger or do this:

Item *item = [self.items objectAtIndex:(NSUInteger)(indexPath.row)];

If you do the latter, you might need to check to make sure row is positive.


Edit

Since the row is a property of NSIndexPath there is clearly a good reason why it might be negative or Apple would have made it an NSUInteger, perhaps if there is no item selected, it is set to -1. So what you should do is make sure that the value of row is not negative and then do the cast above to suppress the warnings, like this:

NSInteger row = indexPath.row
if (row >= 0)
{
    Item *item = [self.items objectAtIndex:(NSUInteger)row];
}
else
{
    // whatever you need to do for no row available
}

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Usually you shouldn't try to be "smart".

NSUInteger row = (NSUInteger)indexPath.row;
Item* item = self.items [row];

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I kept getting this warning after I upgraded to Xcode 11. Going back to Xcode 10 fixed this.

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Comments
  • Yep! The cast is the correct way but I think I will get crazy. What do you mean change the type of the row property to return NSUInteger? row belongs to NSIndexPath class in this case.
  • So, -Wconversion is enabled or not in your projects?
  • @flexaddicted Amended the answer a bit
  • Thanks. Are you using -Wconversion in your project? Just to know. Yep. The cast is the simplier solution but I think I will go with clang push/pop calls in orders to skip those warnings.
  • @flexaddicted Yes, I always turn that one on. They do indicate a real potential problem with your code. If the row property is negative, you will get an array bounds exception.
  • Yep! The cast is the correct way but I think I will get crazy.
  • So, -Wconversion is enabled or not in your projects?
  • The warning is here for a reason. If you do a comparison like indexPath.row < self.items.count-1, and items.count is 0, the unsigned integer integer on the right side will silently underflow (and become NSUIntegerMax), so the result of the comparison will be other than you expected. I wasted few hours of my life because of this subtle bug, after that I always turn this warning on. You can take a look on my question on this: stackoverflow.com/q/21724824/2128900