声明主要的朋友被认为有害？ [英] Declaring main as friend considered harmful?

问题描述

我知道 main 可以是 / code>：

I know that main can be a friend of a class:

#include <iostream>

class foo {
  friend int main();
  int i = 4;
};

int main() {
  foo obj;
  std::cout << obj.i << std::endl;
}

LIVE DEMO

但是，我觉得这是完美的允许它隐藏许多危险。

However, I feel that although this is perfectably allowable it conceals many dangers.

1. c> c c c c>作为类的朋友应该被认为有害吗？

1. Are there any valuable uses in making main a friend of a class?
2. Are there any reasons that declaring main as friend of a class should be considered harmful?

推荐答案

如果功能不可用，选择是否使用或避免法律功能，其实，法律。我相信对此有严重怀疑，因为标准说

The choice whether to use or avoid a legal feature becomes moot if the feature is not, in fact, legal. I believe there's serious doubt surrounding this, because the Standard says

函数 main

已经有一个关于是否结束 :: main（）的问题实际上已被允许，您可以在我的答案中找到更多详细信息。

There's already a question regarding whether befriending ::main() is in fact allowed, and you'll find more details in my answer there.

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