Function hasOperatorFieldnames

src/ExtUtil.actor.cpp:525–550

}

int hasOperatorFieldnames(bson::BSONObj obj,
                          int maxDepth,
                          int ensureEveryFieldnameBeyondThisDepthIsAnOperator,
                          int currentDepth) {
	int index = 0;
	for (auto i = obj.begin(); i.more(); index++) {
		auto next = i.next();
		if (next.fieldName()[0] == '$') {
			if (currentDepth > ensureEveryFieldnameBeyondThisDepthIsAnOperator) {
				if (index > 0)
					throw mixed_operator_literal_update();
				else
					while (i.more())
						if (i.next().fieldName()[0] != '$')
							throw mixed_operator_literal_update();
			}
			return ++currentDepth;
		}
		int depth;
		if ((maxDepth > currentDepth || maxDepth < 0) && next.type() == bson::BSONType::Object &&
		    (depth = hasOperatorFieldnames(next.Obj(), maxDepth, ensureEveryFieldnameBeyondThisDepthIsAnOperator,
		                                   ++currentDepth)))
			return depth;
	}
	return 0;
}

template <class T>
bool isin(std::list<T> coll, T item) {