Method toPredicate

src/ExtOperator.h:35–39

                  std::string,
                  std::function<Reference<IPredicate>(std::string const&, bson::BSONElement const&)>> {
	static Reference<IPredicate> toPredicate(std::string const& op,
	                                         std::string const& unencoded_path,
	                                         bson::BSONElement const& element) {
		return dispatch(op)(unencoded_path, element);
	}
};

#define REGISTER_VALUE_OPERATOR(Op, Key)                                                                               \