virtual function

• 1. 虚拟函式: virtual function | virtuing function
• 2. 纯虚拟函式: pure virtual function
• 3. 虚拟函式表: virtual function table

更多释义

• 1.衍生类别中的函式试图覆写基底类别中的虚拟函式，但衍生类别函式没有与基底类别函式相同的传回型别。
  A function in a derived class attempted to override a virtual function in a base class, but the derived class function did not have the same return type as the base class function.
  dict.yoduao.com
• 2.由抽象类别衍生出来的类别必须实作纯虚拟成员函式，否则它们也是抽象类别。
  Classes derived from the abstract class must implement the pure virtual member function or they, too, are abstract classes.
  dict.yoduao.com

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