final
override
作用,使用场合,不用的后果。
参考文献
1.《C++ Primer》
2.ttps://stackoverflow.com/questions/8824587/what-is-the-purpose-of-the-final-keyword-in-c11-for-functions
3.https://en.cppreference.com/w/cpp/language/final
4.https://stackoverflow.com/questions/99297/how-are-virtual-functions-and-vtable-implemented