#include <timer.h>

Timer::Timer()

{

#ifdef WIN32

QueryPerformanceFrequency(&_frequency);

_start_count.QuadPart = 0;

_end_count.QuadPart = 0;

#else

_start_count.tv_sec = _start_count.tv_usec = 0;

_end_count.tv_sec = _end_count.tv_usec = 0;

#endif

_stopped = 0;

_start_time_microsec = 0;

_end_time_microsec = 0;

}

Timer::~Timer() {}

void Timer::start()

{

_stopped = 0;

#ifdef WIN32

QueryPerformanceCounter(&_start_count);

#else

gettimeofday(&_start_count, nullptr);

#endif

}

void Timer::stop()

{

_stopped = 1;

#ifdef WIN32

QueryPerformanceCounter(&_end_count);

#else

gettimeofday(&_end_count, nullptr);

#endif

}

double Timer::elapsed_time() { return elapsed_time_sec(); }

double Timer::elapsed_time_sec() { return elapsed_time_microsec() * 0.000001; }

double Timer::elapsed_time_milisec() { return elapsed_time_microsec() * 0.001; }

double Timer::elapsed_time_microsec()

{

#ifdef WIN32

if (!_stopped)

QueryPerformanceCounter(&_end_count);

_start_time_microsec = _start_count.QuadPart * (1000000.0 / _frequency.QuadPart);

_end_time_microsec = _end_count.QuadPart * (1000000.0 / _frequency.QuadPart);

#else

if (!_stopped)

gettimeofday(&_end_count, nullptr);

_start_time_microsec = (_start_count.tv_sec * 1000000.0) + _start_count.tv_usec;

_end_time_microsec = (_end_count.tv_sec * 1000000.0) + _end_count.tv_usec;

#endif

return _end_time_microsec - _start_time_microsec;

}