-----------qt-----------C++的模板的使用, ---定义一个模块类--------

转自:http://qt-project.org/forums/viewthread/14782

If we’re throwing around solutions anyway: you could even create a class template that adds this function to any widget you want, including all stock widgets. :-)

1. template <class T>
2. public IDClass<T>: public T {
3. public:
4.    IDClass(int id, QWidget* parent = 0):
5.       m_id(id),
6.       T(parent)
7.    {}
8.  
9.    void setId(int newId) {m_id = newId};
10.    int id() const {return m_id;}
11.  
12. private:
13.    int m_id;
14. }
15.  
16. typedef IDClass<QLineEdit> IdLineEdit;
17. typedef IDClass<QPushButton> IdPushButton;
18. //etc.