0值的自动整数转换失败

I have this source file:

我有这个源文件:

#include <ctime>

class A
{
  public:
    A(unsigned long i){};
    A(const tm*){};
};

int main(int argc, char** argv)
{
  A tit(1);
  A tat(0);
  return 0;
}
#include