Usage of qmap

QMap Usage of

QMap You can define value Structure, etc .
QMap<int,DHVideoDeviceOper*> m_mapDHVideoDeviceOper;
QMap<int,CGroup>* m_pMapGroup;
QMap<int,DHVideoDeviceOper*>* pMapDHVideoDeviceOper

If you need to use a class in the following , You can declare classes directly , As below ：
class DHVideoDeviceOper;
class BackWidget;
class BackPlayWidget : public QWidget, public Ui::BackPlayWidget{
int a;
int b;
};