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High accuracy program timer

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  1. // How to use
  2.  
  3. CStopWatch s;
  4. s.startTimer();
  5.  
  6. // put the code which you want to measure here //
  7.  
  8. s.stopTimer();
  9. double mtime = s.getElapsedTime() * 1000;
  10.  
  11.  
  12. // hr_time.h
  13.  #include <windows.h>
  14.  
  15.  typedef struct {
  16.      LARGE_INTEGER start;
  17.      LARGE_INTEGER stop;
  18.  } stopWatch;
  19.  
  20.  class CStopWatch {
  21.  
  22.  private:
  23.      stopWatch timer;
  24.      LARGE_INTEGER frequency;
  25.      double LIToSecs( LARGE_INTEGER & L) ;
  26.  public:
  27.      CStopWatch() ;
  28.      void startTimer( ) ;
  29.      void stopTimer( ) ;
  30.      double getElapsedTime() ;
  31.  };
  32.  
  33.  
  34. // hr_time.cpp
  35. #include <windows.h>
  36.  
  37.  #ifndef hr_timer
  38.  #include "hr_time.h"
  39.  #define hr_timer
  40.  #endif
  41.  
  42.  double CStopWatch::LIToSecs( LARGE_INTEGER & L) {
  43.      return ((double)L.QuadPart /(double)frequency.QuadPart) ;
  44.  }
  45.  
  46.  CStopWatch::CStopWatch(){
  47.      timer.start.QuadPart=0;
  48.      timer.stop.QuadPart=0; 
  49.      QueryPerformanceFrequency( &frequency ) ;
  50.  }
  51.  
  52.  void CStopWatch::startTimer( ) {
  53.      QueryPerformanceCounter(&timer.start) ;
  54.  }
  55.  
  56.  void CStopWatch::stopTimer( ) {
  57.      QueryPerformanceCounter(&timer.stop) ;
  58.  }
  59.  
  60.  double CStopWatch::getElapsedTime() {
  61.      LARGE_INTEGER time;
  62.      time.QuadPart = timer.stop.QuadPart - timer.start.QuadPart;
  63.      return LIToSecs( time) ;
  64.  }

URL: http://cplus.about.com/od/howtodothingsi2/a/timing.htm

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