将新的运算符类型添加到nspredicateoperatortype

Question

NSPredicateOperatorType具有一组运算符类型。

enum {
   NSLessThanPredicateOperatorType = 0,
   NSLessThanOrEqualToPredicateOperatorType,
   NSGreaterThanPredicateOperatorType,
   NSGreaterThanOrEqualToPredicateOperatorType,
   NSEqualToPredicateOperatorType,
   NSNotEqualToPredicateOperatorType,
   NSMatchesPredicateOperatorType,
   NSLikePredicateOperatorType,
   NSBeginsWithPredicateOperatorType,
   NSEndsWithPredicateOperatorType,
   NSInPredicateOperatorType,
   NSCustomSelectorPredicateOperatorType,
   NSContainsPredicateOperatorType,
   NSBetweenPredicateOperatorType
};
typedef NSUInteger NSPredicateOperatorType;

似乎无法添加额外的运算符。但是，有什么方法可以为我的目的添加一个新的运算符。

此致