Timing class using C++ 11 and chrono, used to measure time

timing.cpp

#include "Timing.h"

double Timing::getEllipsedMilliseconds()
{
	if (m_running)
	{
		setToCurrentTime(m_endTime);
	}
	return static_cast<double>(std::chrono::duration_cast<std::chrono::nanoseconds>(m_endTime - m_startTime).count()) / 1000000.0;
}

void Timing::stopTiming()
{
	setToCurrentTime(m_endTime);
	m_running = false;
}

void Timing::startTiming()
{
	setToCurrentTime(m_startTime);
	m_running = true;
}

Timing::~Timing()
{

}

Timing::Timing()
{
	startTiming();
}

void Timing::setToCurrentTime(std::chrono::high_resolution_clock::time_point & timePoint)
{
	timePoint = std::chrono::high_resolution_clock::now();
}

timing.h

#pragma once

/************************************************************************
* Function: Timing operation
* Date: 2014-07-13
* Author: zisxks@gmail.com
************************************************************************/

#include <chrono>

class Timing
{
public:
	Timing();
	~Timing();

	void startTiming();
	void stopTiming();
	double getEllipsedMilliseconds();

private:
	inline void setToCurrentTime(std::chrono::high_resolution_clock::time_point & timePoint);

	std::chrono::high_resolution_clock::time_point m_startTime;
	std::chrono::high_resolution_clock::time_point m_endTime;
	bool m_running = false;
};