Using this feature is an optimization that reduces overall code size because, by default, even if the code does not throw exceptions, cl still generates stack unwinding information for C++ sources.

使用这个特性可以对减少整体代码的大小进行优化，因为在缺省情况下，即使代码不会引发异常，cl 仍然会为 C++ 源代码生成堆栈展开信息。

youdao

But this isn't unwinding the stack (not yet at least).

然而这并不是堆栈展开(unwinding the stack)(至少现在不是)。

youdao

Destructors are often executed during stack unwinding.

栈展开期间会经常执行析构函数。

youdao