How do I write the move assignment function for this derived class?
我怎样为这个派生类编写移动赋值函数？
Execution of a derived class definition proceeds the same as for a base class.
派生类定义的执行过程和基类是一样的。
When overridden in a derived class, clears the local value for the property.
在衍生类别中覆写时，清除属性的区域数值。
The constructor for the base class must be called in the derived class.
基底类别的建构函式必须在衍生类别中呼叫。
The constructor for the base class must be called in the derived class.
基底类别的建构函式必须在衍生类别中呼叫。
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