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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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。

youdao