关于虚函数表的机制：1:虚表(虚函数表)是for类的 2:基类和派生类是各有各的表,也就是说他们的物理地址是分开的,基类和派生类的虚表的唯一关联是:当派生类没有实现.-on the virtual function table mechanisms : 1 : virtual table (virtual function tables) for the two categories : base class and the derived class is their own table, meaning their physical address is separate from the base class and the derived class of the virtual table is the only correlation : When your class did not materialize.