The virtual function allows one type to express its distinction from another,similar type,as long as they're both derived from the same base type.This distinction is expressed through differences in behavior of the functions that you can call through the base class. 017年4月26日星期 第12章多态性与虚函数 HOME 10 12时14分39秒 BACK NEXTHOME2017年4月26日星期 三12时14分39秒 第12章 多态性与虚函数 10 The virtual function allows one type to express its distinction from another, similar type, as long as they’re both derived from the same base type. This distinction is expressed through differences in behavior of the functions that you can call through the base class