timer.h

#pragma once

#include <chrono>

class timer
{
private:
	std::chrono::steady_clock::duration total_duration;
	std::chrono::steady_clock::duration lap_duration;
	std::chrono::steady_clock::time_point start_point;
	static constexpr double ticks_to_sec = ((double)std::chrono::steady_clock::period::num) / std::chrono::steady_clock::period::den; // duration of one tick
public:
	timer(bool start = false)
	{
		this->reset();

		if(start)
			this->start();
	}

	void start()
	{
		this->start_point = std::chrono::steady_clock::now();
	}

	void stop()
	{
		auto stop_point = std::chrono::steady_clock::now();
		this->lap_duration = stop_point - start_point;
		this->total_duration += this->lap_duration;
	}

	void reset()
	{
		this->total_duration = std::chrono::steady_clock::duration(0);
		this->lap_duration = std::chrono::steady_clock::duration(0);
	}

	std::chrono::steady_clock::duration get_lap_duration() const
	{
		return this->lap_duration;
	}

	std::chrono::steady_clock::duration get_total_duration() const
	{
		return this->total_duration;
	}

	double get_lap_time() const
	{
		return (double)this->lap_duration.count() * ticks_to_sec;
	}

	double get_total_time() const
	{
		return this->total_duration.count() * ticks_to_sec;
	}
};