namespace Utils {

	template <
		typename TimeUnit = std::chrono::milliseconds,
		typename Clock = std::chrono::high_resolution_clock
	>
	class Stopwatch
	{
	public:

		explicit Stopwatch()
		{
			reset();
		}

		inline void reset()
		{
			start_ = Clock::now();
			stopped_ = false;
		}

		inline void stop()
		{
			stop_ = Clock::now();
			stopped_ = true;
		}

		/// If the timer is stopped, returns the elapsed time between the start and stop times.
		/// Otherwise, returns the elapsed time between the start time and the current time
		inline TimeUnit elapsed() const
		{
			auto t = stopped_ ? stop_ : Clock::now();
			return std::chrono::duration_cast<TimeUnit>(t - start_);
		}

	private:
		std::chrono::time_point<Clock> start_, stop_;
		bool stopped_ = false;
	};

}