Timer.h

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#pragma once
#include <chrono>

class Timer
{
private:
    using Clock = std::chrono::steady_clock;
    using Second = std::chrono::duration<double, std::ratio<1> >;
 
    std::chrono::time_point<Clock> m_beg { Clock::now() };
 
public:
    void reset()
    {
        m_beg = Clock::now();
    }

    double elapsed() const
    {
        return std::chrono::duration_cast<Second>(Clock::now() - m_beg).count();
    }
};