HR Timer

/************************************************************************************
 *  High Resolution Windows Timer
 *	-----------------------------
 *	code by : bobby anguelov - banguelov@cs.up.ac.za
 *	downloaded from : takinginitiative.wordpress.org
 *
 *	code is free for use in whatever way you want, however if you work for a game
 *	development firm you are obliged to offer me a job :P (haha i wish)
 ************************************************************************************/
#ifndef HRTIMER
#define HRTIMER

#include <windows.h>

class HRTimer
{
private:
	
	LARGE_INTEGER start;
    LARGE_INTEGER stop;
    LARGE_INTEGER frequency;
	LARGE_INTEGER timeElapsed;

public:
    
	HRTimer()
	{
		//get CPU frequency
		QueryPerformanceFrequency( &frequency );
	}

    void startTimer()
	{
		//store initial value
		QueryPerformanceCounter( &start ) ;
	}

    void stopTimer()
	{
		//store end value
		QueryPerformanceCounter( &stop ) ;
	}

    double getElapsedTime()
	{		
		//get elapsed time
		timeElapsed.QuadPart = stop.QuadPart - start.QuadPart;		
		double elapsedS = (double)timeElapsed.QuadPart / (double)frequency.QuadPart;

		//return elapsed time in seconds
		return elapsedS;
	}

};

#endif