jg_stopwatch.hpp

#pragma once

#include <chrono>

namespace jg
{
    class stopwatch final
    {
        using clock = std::chrono::high_resolution_clock;
        clock::time_point m_start = clock::now();

        template <typename T>
        typename T::rep duration_rep() const
        {
            return std::chrono::duration_cast<T>(clock::now() - m_start).count();
        }

    public:

        std::chrono::microseconds::rep us() const
        {
            return duration_rep<std::chrono::microseconds>();
        }

        std::chrono::milliseconds::rep ms() const
        {
            return duration_rep<std::chrono::milliseconds>();
        }
    };
}