template <typename ForwardIterator>

 Q_OUTOFLINE_TEMPLATE void qDeleteAll(ForwardIterator begin, ForwardIterator end)

 {

     while (begin != end)

     {

         delete *begin;

         ++begin;

     }

 }

 template <typename Container>

 inline void qDeleteAll(const Container &c)

 {

     qDeleteAll(c.begin(), c.end());

 }

 #include <QMap>

 #include <QString>

 #include <QWidget>

 #include <QDebug>

 #include <QApplication>

 class PersonInfo

 {

 public:

     PersonInfo(int id = -, QString name = QString(), QWidget* pWidget = NULL)

         : m_nId(id)

         , m_name(name)

         , m_pWidget(pWidget)

     {}

     ~PersonInfo()

     {

         m_nId = -;

         m_name = QString();

         if (m_pWidget != NULL)

         {

             qDebug() << "delete personInfo :: " << this;

             delete m_pWidget;

             m_pWidget = NULL;

         }

     }

 private:

     int m_nId;

     QString m_name;

     QWidget* m_pWidget;

 };

 int main(int argc, char *argv[])

 {

     QApplication a(argc, argv);

     QMap<int, PersonInfo *> map;

     for (int i = ; i < ; ++i)

     {

         PersonInfo *pTemp = new PersonInfo(i + , QString("hello World!"), (new QWidget()));

         qDebug() << "construct personInf :: " << pTemp;

         map.insert(i, pTemp);

     }

     qDeleteAll(map); // 1.释放内存

     qDebug() << "after qDeleteAll size :: " << map.size() << endl;

     map.clear(); // 2.必须清空

     qDeleteAll(map); // 3.再次释放内存

     return a.exec();

 }

 construct personInf ::  0x3bdc20

 construct personInf ::  0x3c0308

 construct personInf ::  0x3bfe08

 construct personInf ::  0x3c0a88

 construct personInf ::  0x3c1248

 construct personInf ::  0x3c1738

 construct personInf ::  0x3c1bb8

 construct personInf ::  0x3c2420

 construct personInf ::  0x3c26d0

 construct personInf ::  0x3c2c68

 delete personInfo ::  0x3bdc20

 delete personInfo ::  0x3c0308

 delete personInfo ::  0x3bfe08

 delete personInfo ::  0x3c0a88

 delete personInfo ::  0x3c1248

 delete personInfo ::  0x3c1738

 delete personInfo ::  0x3c1bb8

 delete personInfo ::  0x3c2420

 delete personInfo ::  0x3c26d0

 delete personInfo ::  0x3c2c68

 after qDeleteAll size ::