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Assert comparison block in diffing algorithm

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This commit is contained in:
Huy Nguyen
2016-02-24 20:42:18 -08:00
parent bd1b195dbe
commit 32a8f9c831
1 changed files with 2 additions and 0 deletions
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2
AsyncDisplayKit/Private/NSArray+Diffing.m
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@@ -19,6 +19,7 @@
- (void)asdk_diffWithArray:(NSArray *)array insertions:(NSIndexSet **)insertions deletions:(NSIndexSet **)deletions compareBlock:(BOOL (^)(id lhs, id rhs))comparison
{
NSAssert(comparison != nil, @"Comparison block is required");
NSIndexSet *commonIndexes = [self _asdk_commonIndexesWithArray:array compareBlock:comparison];
if (insertions) {
@@ -48,6 +49,7 @@
- (NSIndexSet *)_asdk_commonIndexesWithArray:(NSArray *)array compareBlock:(BOOL (^)(id lhs, id rhs))comparison
{
NSAssert(comparison != nil, @"Comparison block is required");
NSInteger lengths[self.count+1][array.count+1];
for (NSInteger i = self.count; i >= 0; i--) {
for (NSInteger j = array.count; j >= 0; j--) {