Method toPredicate

src/ExtOperator.actor.cpp:54–63

struct ExtValueOperatorNin {
	static const char* name;
	static Reference<IPredicate> toPredicate(std::string const& unencoded_path, bson::BSONElement const& element) {
		std::vector<Reference<IPredicate>> terms;
		// We can do this *despite* Mongo array semantics, because those semantics inconsistently treat a
		// $ne like a $not: {path: {$in: element}}.
		for (auto it = element.Obj().begin(); it.more();) {
			auto el = it.next();
			terms.push_back(ref(new NotPredicate(eq_predicate(el, unencoded_path))));
		}
		return ref(new AndPredicate(terms));
	}
};
REGISTER_VALUE_OPERATOR(ExtValueOperatorNin, "$nin");