Function duration_ns

src/include/utils/utils.hpp:40–42

\brief duration in nanoseconds \param start the start time \param stop the stop time \return the duration in nanoseconds

/// \param stop the stop time
/// \return the duration in nanoseconds
inline time_with_unit duration_ns(time_point start, time_point stop){
    return std::make_pair(std::chrono::duration_cast<std::chrono::nanoseconds>(stop - start).count(), "ns");
}

/// \brief duration in microseconds
/// \param start the start time