in RenderCore/Utilities/RCEqualityHelpers.h [203:210]
inline BOOL RCCompareObjectEquality(id object, id comparisonObject, RCEqualityComparisonBlock comparisonBlock) {
if (object == comparisonObject) {
return YES;
} else if (!object || !comparisonObject || ![comparisonObject isKindOfClass:[object class]]) {
return NO;
}
return comparisonBlock(object, comparisonObject);
}