摘要：
the two keyword are aimed at virtual functionfinal final function must be a virtual funtion , final means that the base virtual function can not be... 阅读全文
摘要：
A C++ program can be made easier to read and maintain by using references rather than pointers. A C++ function can return a reference in a similar way... 阅读全文
摘要：
polymorphism without virtual function 阅读全文