Example for QueryPerformanceCounter to get current time in Windows C++

perf_counter_timer.hpp

//
// PerfCounterTimer:
//     To get current time in millisecond, use (1000.0 * GetCurrentTime() / GetFrequency()).
//     Practically, you must cache value from GetFrequency() so that you don't need to 
//     re-query the frequency every time
//

#pragma once

#include <windows.h>

class PerfCounterTimer
{
public:
	static LONGLONG GetCurrentCounter()
	{
		LARGE_INTEGER counter;

		if(!::QueryPerformanceCounter(&counter))
			return -1.0;

		return counter.QuadPart;
	}

	static LONGLONG GetFrequency()
	{
		LARGE_INTEGER freq;

		if(!::QueryPerformanceFrequency(&freq))
			return -1.0;

		return freq.QuadPart;
	}
private:
	PerfCounterTimer(void){}
	~PerfCounterTimer(void){}
};