Add output statements to the constructor, destructor and copy constructor to see the effect of the Named Return Value optimization when you run the program.

将输出语句添加到构造函数、析构函数和复制构造函数，以查看在运行程序时命名返回值优化的效果。

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Is it better to have one method which can return a value irrelevant to the objective of the method or two separate methods named accordingly?

最好是有一个方法可以返回一个值无关的目标的方法或两种不同的方法，据此命名？

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