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Asked: 2026-05-13T19:47:32+00:00

I have some objects that have 3 sorting options: quality, quatity and a compare

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I have some objects that have 3 sorting options: quality, quatity and a compare against the other object, sorted by that order.

- (NSComparisonResult) compare: (MyObject *) obj {
if (self.quality > obj.quality)
return NSOrderedAscending;
else if (self.quality < obj.quality)
return NSOrderedDescending;

if (self.quantity > obj.quantity)
return NSOrderedAscending;
else if (self.quantity < obj.quantity)
return NSOrderedDescending;

if ([self betterThan: obj])
return NSOrderedAscending;

if ([obj betterThan: self])
return NSOrderedDescending;

return NSOrderedSame;
}

My problem is that, the betterThan: method might cause a cyclic compare if the objects have the same quality and quantity, and I want to return any sort order in that case.

For example, A, B and C have the same quality/quantity, but

A betterThan: B => YES
B betterThan: C => YES
C betterThan: A => YES

Solutions? Thanks.

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1 Answer

  1. Editorial Team

    Ok, I found out the bug had nothing to do with sorting (although it seemed to be caused by it).

    Apparently this actually works. The system stops sorting if there’s a deadlock.

    Thanks for your time, anyway. 🙂

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