//----------------------------------------------------------------------------
//  EgalTech    2013-2014
//----------------------------------------------------------------------------
// File : EgtPerfCounter.h         Data : 14.01.14          Versione : 1.5a3
// Contenuto : Oggetto cronometro.
//
//
//
// Modifiche : 14.01.14 DS Creazione modulo.
//
//
//----------------------------------------------------------------------------

#pragma once

#define NOMINMAX
#include <Windows.h>

//----------------------------------------------------------------------------
class PerformanceCounter
{
   public :
      PerformanceCounter( void)
         { QueryPerformanceFrequency( (LARGE_INTEGER*) &m_lnFreq) ;
           if ( m_lnFreq <= 0)
              m_lnFreq = 1 ;
           Start() ; }
      void Start( void)
         { QueryPerformanceCounter( (LARGE_INTEGER*) &m_lnStart) ; }
      double Stop( void)
         { __int64 lnStop ;
           QueryPerformanceCounter( (LARGE_INTEGER*) &lnStop) ;
           m_dTime = ( (double) lnStop - (double) m_lnStart) / (double) m_lnFreq * 1000 ;
           return m_dTime ; }
      double GetTime( void)
         { return m_dTime ; }

   private :
      __int64 m_lnFreq ;
      __int64 m_lnStart ;
      double  m_dTime ;          // in millisecondi
} ;