Demande de code

#include <windows.h>
#include <mmsystem.h>
/***** Déclaration de la classe *****/
class Timer
{
LONGLONG start_time;
LONGLONG cur_time;
LONGLONG last_time;
float time_elapsed;
float time_scale;
float GetTimePerf();
//float GetTime();
public:
Timer();                                 // Constructeur
~Timer();                               // Destructeur

void Start();                            // Initialisation du timer
float GetTotalElapsedTime();     // Temps écoulé depuis l'initialisation du timer
float GetElapsedTime();            // Temps écoulé entre deux appels de la fonction
};
/***** Description des méthodes de la classe *****/
Timer::Timer()
{
}
Timer::~Timer()
{
}
void Timer::Start()
{
LONGLONG perf_cnt = 0;
//if (QueryPerformanceFrequency((LARGE_INTEGER *) &perf_cnt)){
time_scale = 1.0f / perf_cnt;
QueryPerformanceCounter((LARGE_INTEGER *) &start_time);
last_time = start_time;
//}else{
// start_time = last_time = timeGetTime();
// time_scale = 0.001f;
//}
}
//float Timer::GetTime()
//{
//return (float)timeGetTime();
//}
float Timer::GetTimePerf()
{
QueryPerformanceCounter((LARGE_INTEGER *) &cur_time);

return (float)cur_time;
}
float Timer::GetTotalElapsedTime()
{
cur_time = this->GetTimePerf();
time_elapsed = (cur_time - start_time) * time_scale;
last_time = cur_time;
return time_elapsed;
}
float Timer::GetElapsedTime()
{
cur_time = this->GetTimePerf();
time_elapsed = (cur_time - last_time) * time_scale;
last_time = cur_time;
return time_elapsed;
}