#ifndef IDGENERATOR_H
#define IDGENERATOR_H

#include <QMap>
#include <QByteArray>

class  IDGenerator
{
public:
    qint64 new_id();
    void recylce_id(qint64 id);
    void use_id(qint64 id);

    qint64 next_id();

	QByteArray to_bytes() const;
	void from_bytes(const QByteArray& bytes);

private:
    qint64 m_id = 1;
    QMap<qint64, qint64> m_recycle_id;
    QMap<qint64, qint64> m_use_id;
};

#endif