?? perftimer.cpp
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// CPerfTimer - a simple Win32 performance counter wrapper
// by Dean Wyant dwyant@mindspring.com
#include "stdafx.h"
#include "PerfTimer.h"
// Declare and initialize static member vars that get set only once and never change
__int64 CPerfTimer::m_Freq = 0;
__int64 CPerfTimer::m_Adjust = 0;
// All functions defined inline for speed. After all, the performance counter is
// supposed to be able to time very short events fairly accurately.
BOOL CPerfTimer::IsSupported()
{ // Returns FALSE if performance counter not supported.
// Call after constructing at least one CPerfTimer
return (m_Freq > 1);
}
const double CPerfTimer::Resolution()
{ // Returns timer resolution in seconds
return 1.0/(double)m_Freq;
}
const double CPerfTimer::Resolutionms()
{ // Returns timer resolution in milliseconds
return 1000.0/(double)m_Freq;
}
const double CPerfTimer::Resolutionus()
{ // Returns timer resolution in microseconds
return 1000000.0/(double)m_Freq;
}
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