the pattern should be a static member in the class.
则模式应是类中的静态成员。
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。
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。
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