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虚表是 C++ 实现多态的关键机制 。当类中包含虚函数时，编译器会为该类生成虚表 。简单来说，虚表本质上是一个存储虚函数地址的函数指针数组。对于每一个包含虚函数的类，都有一个与之对应的虚表，它就像是一个函数地址的目录，记录着该类中所有虚函数 ...