Measurement with boost::posix_time::microsec_clock has error more than ten microseconds?

Question

I have the following code:

long long unsigned int GetCurrentTimestamp()
{
   LARGE_INTEGER res;
   QueryPerformanceCounter(&res);
   return res.QuadPart;         


        

Answer 1

Unfortunately current Boost implementation of boost::posix_time::microsec_clock doesn't uses QueryPerformanceCounter Win32 API, it uses GetSystemTimeAsFileTime instead which in its turn uses GetSystemTime. But system time resolution is milliseconds (or even worse).