class TimingUtil
{
    std::chrono::steady_clock::time_point _start;
    string                                _message;
    public:
    TimingUtil(string const & message):_start   (chrono::steady_clock::now()),
                                       _message (message)
                                       {}

    ~TimingUtil()
    {
        chrono::steady_clock::time_point finish = chrono::steady_clock::now();
        cout << _message << " took "
             << chrono::duration_cast<chrono::nanoseconds>(finish - _start).count()
             << " nano sec" << endl;
    }

    long long GetTime()
    {
        chrono::steady_clock::time_point finish = chrono::steady_clock::now();
        return chrono::duration_cast<chrono::nanoseconds>(finish - _start).count();
    }
};