#include <time.h>  // include time.hclass Time{	float timediff;					// time between previous and current frame	bool  hi_res_timer_available;	                // does the hardware support hi-res timing	LARGE_INTEGER hi_timefreq, hi_timecurrent, hi_timeprevious;                 // hi-res timer	DWORD					   lo_timecurrent, lo_timeprevious; // low-res timerpublic:		float GetTime() {	return timediff; }	bool HiClock() { return hi_res_timer_available;	}	// True if hi-res timer is in use	void Init()	{		if ( QueryPerformanceFrequency(&hi_timefreq) )	// hi-res timer is accessible, set it up!		{			hi_res_timer_available = true;				// tell UpdateTime to use hi-res variables			QueryPerformanceCounter(&hi_timeprevious);	// UpdateTime relies on having a good prev value		}		else		{			hi_res_timer_available = false;				// tell UpdateTime to use lo-res variables			lo_timeprevious = clock();				// UpdateTime relies on having a good prev value		}	}	void UpdateTime()	{		if (true == hi_res_timer_available)				// do we update the hi or lo-res timer		{			QueryPerformanceCounter(&hi_timecurrent);      // get the new hi-res time// Calculate the time elappsed since the last frame was drawn, and the current one			timediff= (float)(hi_timecurrent.QuadPart-hi_timeprevious.QuadPart)/ hi_timefreq.QuadPart;			hi_timeprevious = hi_timecurrent;			// set up the timer for the next update		}		else		{			lo_timecurrent	= clock();	 						timediff		= (float)(lo_timecurrent-lo_timeprevious) / CLOCKS_PER_SEC;					lo_timeprevious	= lo_timecurrent;		}			}};