如何在C ++中检查输出流是否是std :: cout？

Question

我正在实现输出流运算符<< overload，我需要检查输出流参数os是std :: cout，如果没有，抛出std :: runtime_error - 我该如何检查它？

   friend std::ostream& operator<<(std::ostream& os, const Software &soft)

Answer 1

I question the kind of logic that would lead you to think you have to do this, but if you really want to...

if (&os != &std::cout) {
    throw std::runtime_error(/* ... */);
}