• 1. virtual function pointer: 虚函数指针
• 2. virtual function pointer table: 继承中的虚函数表

• 1.You can then use the return pointer to configure other aspects of the virtual file, such as the function to call when a read is performed on the file.
  然后就可以使用这个返回的指针来配置这个虚拟文件的其他参数，例如在对该文件执行读操作时应该调用的函数。
  dict.yoduao.com
• 2.If the function is virtual and the call is through a reference or pointer, then the compiler generates code to determine which version to run based on the dynamic type of the object.
  如果函数是虚函数，并且调用是通过引用或者指针，编译器基于动态类型生成代码确定调用哪个版本。
  dict.yoduao.com

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