析构函数异常

struct Bad {
  ~Bad() {
    std::cout << "Throwing in destructor!\n";
    throw std::runtime_error("oops"); // ❌ 危险！  异常捕获不到
  }
};

void foo() {
  Bad b;
  throw std::logic_error("original error"); // 触发栈展开
}

int main() {
  try {
    foo();
  } catch (const std::exception &e) {
    std::cout << "Caught: " << e.what() << "\n";
  }

  getchar();
}