#pragma once
//精确计时 微秒级别

class CTimer
{
public:
	CTimer()
	{
		QueryPerformanceFrequency(&m_Frequency);
		Start();
	}
	~CTimer();

	void Start()
	{
		QueryPerformanceCounter(&m_StartCount);
	}
	double End()
	{
		LARGE_INTEGER CurrentCount;
		QueryPerformanceCounter(&CurrentCount);
		return double(CurrentCount.LowPart - m_StartCount.LowPart) / (double)m_Frequency.LowPart;
	}
private:
	LARGE_INTEGER m_Frequency;
	LARGE_INTEGER m_StartCount;
};