An assignment operator shall be implemented by a non-static member function with exactly one parameter.
赋值操作符应该实现为带一个参数的非静态成员函数。
If the function was intended to be a static member function, rename it so it doesn't conflict with the base class virtual function.
如果函数用作静态成员函数，则重命名该函数，以便不与基类虚函数冲突。
If the function was intended to be a static member function, rename it so it doesn't conflict with the base class virtual function.
如果函数用作静态成员函数，则重命名该函数，以便不与基类虚函数冲突。
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