get elapse time in cpp 在cpp中获取时间

get from Stack Overflow

    std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
    Sleep(1000);
    std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
    std::cout << "Time difference = " << std::chrono::duration_cast<std::chrono::milliseconds> (end - begin).count() << std::endl;