Realizing the access of (class?)static member function to class non-static member.

实现了让类的静态成员函数访问类中非静态成员。

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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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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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