虚函数的使用技巧

说明：  这个主要讲了在C++中虚函数的使用技巧,众所周知,虚函数的使用是C++中一个难点,希望这个对大家有帮助
(the main speakers in the C function of the use of virtual skills, as we all know, the use of virtual function C is a difficult issue, we hope that the right help)