45. Use member function templates to accept all compatible types.
运用成员函数模板接受所有兼容类型
请记住：
请使用member function templates(成员函数模板)生成"可接收所有兼容类型"的函数。
如果你声明member templates用于"泛化copy构造"或"泛化assignment操作"，你还是需要声明正常的copy构造函数和copy assignment操作符。
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