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Re: -NSMutableIndexSet shiftIndexesStartingAtIndex:by: weirdness
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Re: -NSMutableIndexSet shiftIndexesStartingAtIndex:by: weirdness


  • Subject: Re: -NSMutableIndexSet shiftIndexesStartingAtIndex:by: weirdness
  • From: Tommy Nordgren <email@hidden>
  • Date: Thu, 17 Sep 2009 16:50:41 +0200


On 17 sep 2009, at 15.23, steven Hooley wrote:

- shiftIndexesStartingAtIndex:by: and
-containsIndexesInRange:NSMakeRange: don't seem to play nicely
together..
Is this expected?

NSMutableIndexSet *someIndexes = [NSMutableIndexSet indexSet];
[someIndexes addIndex:0];
[someIndexes addIndex:2];
[someIndexes shiftIndexesStartingAtIndex:2 by:-1];

BOOL result1 = [someIndexes containsIndex:0];
BOOL result2 = [someIndexes containsIndex:1];
BOOL result3 = [someIndexes containsIndexesInRange:NSMakeRange(0,2)];

	Here is the error. You are asking if the index set contains (0,1,2),
But it only contains (0, 1) after the shift
	Try using NSMakeRange (0,1) instead.
NSLog(@"%@ %@ %@", (result1 ? @"YES" : @"NO"), (result2 ? @"YES" :
@"NO"), (result3 ? @"YES" : @"NO") );

-- 2009-09-17 14:21:25.789 otest[19356:10b] YES YES NO

thanks
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  • Follow-Ups:
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      • From: Roland King <email@hidden>
    • Re: -NSMutableIndexSet shiftIndexesStartingAtIndex:by: weirdness
      • From: Richard Frith-Macdonald <email@hidden>
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 >-NSMutableIndexSet shiftIndexesStartingAtIndex:by: weirdness (From: steven Hooley <email@hidden>)

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