Class IndexScanListIterator

src/jrd/btr.h:484–530

// List scan iterator

class IndexScanListIterator
{
public:
	IndexScanListIterator(thread_db* tdbb, const IndexRetrieval* retrieval);

	bool isEmpty() const
	{
		return m_listValues.isEmpty();
	}

	bool getNext(thread_db* tdbb, temporary_key* lower, temporary_key* upper)
	{
		if (++m_iterator < m_listValues.end())
		{
			makeKeys(tdbb, lower, upper);
			return true;
		}

		m_iterator = nullptr;
		return false;
	}

	const ValueExprNode* const* getLowerValues() const
	{
		return m_lowerValues.begin();
	}

	const ValueExprNode* const* getUpperValues() const
	{
		return m_upperValues.begin();
	}

	SSHORT* getScale()
	{
		return m_retrieval->irb_scale;
	}

private:
	void makeKeys(thread_db* tdbb, temporary_key* lower, temporary_key* upper);

	const IndexRetrieval* const m_retrieval;
	Firebird::HalfStaticArray<const ValueExprNode*, 16> m_listValues;
	Firebird::HalfStaticArray<const ValueExprNode*, 4> m_lowerValues;
	Firebird::HalfStaticArray<const ValueExprNode*, 4> m_upperValues;
	const ValueExprNode* const* m_iterator;
	USHORT m_segno = MAX_USHORT;
};

} //namespace Jrd