m_length(length),

m_lastTime(now())

{

auto delta = std::chrono::duration_cast<std::chrono::milliseconds>(now() - m_lastTime).count();

if (delta > 5000) {

return 0;

} else {

double speed = 0;

for (auto & v : m_lSpeeds) {

speed += v / m_lSpeeds.size();

}

return speed;

}

const timepoint newTime = now();

auto delta = std::chrono::duration_cast<std::chrono::milliseconds>(newTime - m_lastTime).count();

m_lSpeeds.push_back((1000 * V) / delta);

m_lastTime = newTime;

if (m_lSpeeds.size() > m_length) {

m_lSpeeds.pop_front();

}