C++11 std::chrno简单运用

//该程序意在输出10分之1秒的系统时间戳

void printTimestamp(void)
{
    using namespace std::chrono;

    typedef typename duration<long, std::ratio<1, 10>> mseconds;
    time_point tp = time_point_cast(system_clock::now());
    auto tmp = duration_cast(tp.time_since_epoch());
    auto timeStamp = tmp.count();

    printf("Current timeStamp(10 percent of a second)==%lu\n", timeStamp);
}