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【C】统计运行时间

作者: / 发布于2014/5/22/ 330

统计运行时间


	class HighResElapsedTimer
	{
	public:
	 HighResElapsedTimer(const std::string& strName) : m_strName(strName)
	 {
	 if (m_llFrequency == 0) // frequency value not yet set
	 {
	 LARGE_INTEGER liFrequency;

	 QueryPerformanceFrequency(&liFrequency);
	 m_llFrequency = liFrequency.QuadPart;
	 }

	 QueryPerformanceCounter(&m_llCounter);
	 }

	 virtual ~HighResElapsedTimer()
	 {
	 LARGE_INTEGER liNow;
	 QueryPerformanceCounter(&liNow);
	 double duration = (double)
	 (liNow.QuadPart - m_llCounter.QuadPart)
	 /
	 m_llFrequency;

	 std::cout << m_strName.c_str() <<
	 " : Elapsed time = " << duration << " microseconds" << std::endl;
	 }

	private:
	 std::string m_strName;
	 LARGE_INTEGER m_llCounter;

	private:
	 static LONGLONG m_llFrequency; // Frequency setting is based hardware clock which doesn&apos;t
	 // does change - so we want to set this only once

	private:
	 HighResElapsedTimer(const HighResElapsedTimer&);
	 HighResElapsedTimer& operator=(const HighResElapsedTimer&);
	};

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