Why can't this friend function access the private variables?

为什么这不可以友元函数访问私有变量？

youdao

Let's see an example of where some private variables will be useful. Consider this subroutine.

如下示例展示私有变量在哪里会很有用。

youdao

Loops and such constructs do not open a new scope, so there is no way to create private variables within them.

这种循环和建构不打开一个新的范围，所以是没有出路的创造私人变数。

youdao

To examine this phenomenon further, I ran multiple regression analyses with the party score as the dependent variable and various institutional data points (controlling for tuition, proportion of students receiving Pell grants, overall enrollment, average SAT scores and whether schools were public or private) as the independent variables.

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Using historical price data along with other variables, SeatGeek uses a private algorithm to forecast whether a ticket will rise or fall in price.

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