Fix index path arithmetic error

erichoracek · erichoracek · commit d89504e345f2 · 2016-06-05T21:38:08.000-07:00
diff --git a/AsyncDisplayKit/Private/ASMultidimensionalArrayUtils.mm b/AsyncDisplayKit/Private/ASMultidimensionalArrayUtils.mm
@@ -67,7 +67,12 @@ static BOOL ASElementExistsAtIndexPathForMultidimensionalArray(NSArray *array, N
     return NO;
   }
 
-  return ASElementExistsAtIndexPathForMultidimensionalArray(array[firstIndex], [indexPath indexPathByRemovingLastIndex]);
+  NSUInteger indexesLength = indexLength - 1;
+  NSUInteger indexes[indexesLength];
+  [indexPath getIndexes:indexes range:NSMakeRange(1, indexesLength)];
+  NSIndexPath *indexPathByRemovingFirstIndex = [NSIndexPath indexPathWithIndexes:indexes length:indexesLength];
+
+  return ASElementExistsAtIndexPathForMultidimensionalArray(array[firstIndex], indexPathByRemovingFirstIndex);
 }
 
 #pragma mark - Public Methods

Original file line number	Diff line number	Diff line change
`@@ -67,7 +67,12 @@ static BOOL ASElementExistsAtIndexPathForMultidimensionalArray(NSArray *array, N`
`67`	`67`	`return NO;`
`68`	`68`	`}`
`69`	`69`
`70`		`- return ASElementExistsAtIndexPathForMultidimensionalArray(array[firstIndex], [indexPath indexPathByRemovingLastIndex]);`
	`70`	`+ NSUInteger indexesLength = indexLength - 1;`
	`71`	`+ NSUInteger indexes[indexesLength];`
	`72`	`+ [indexPath getIndexes:indexes range:NSMakeRange(1, indexesLength)];`
	`73`	`+ NSIndexPath *indexPathByRemovingFirstIndex = [NSIndexPath indexPathWithIndexes:indexes length:indexesLength];`
	`74`	`+`
	`75`	`+ return ASElementExistsAtIndexPathForMultidimensionalArray(array[firstIndex], indexPathByRemovingFirstIndex);`
`71`	`76`	`}`
`72`	`77`
`73`	`78`	`#pragma mark - Public Methods`