这个自初始化有效吗？ [英] Is this self initialization valid?

问题描述

我有这个问题，我以前想过，但认为这不是微不足道的回答

I have this question, which i thought about earlier, but figured it's not trivial to answer

int x = x + 1;
int main() {
  return x;
}

我的问题是程序的行为是定义还是未定义在所有。如果它被定义，是 x 在 main 中已知的值？

My question is whether the behavior of the program is defined or undefined if it's valid at all. If it's defined, is the value of x known in main?

推荐答案

我确定它是定义的，x应该有值1.§3.6.2/ 1说：具有静态存储持续时间（3.7.1）的对象在任何其他初始化之前应该被初始化（8.5）。

I'm pretty sure it's defined, and x should have the value 1. §3.6.2/1 says: "Objects with static storage duration (3.7.1) shall be zero-initialized (8.5) before any other initialization takes place."

之后，我认为这是非常简单的。

After that, I think it's all pretty straightforward.

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