StopWatch.hh

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//=============================================================================
//
//  CLASS StopWatch
//
//=============================================================================


#ifndef ACG_STOPWATCH_HH
#define ACG_STOPWATCH_HH


//== INCLUDES =================================================================


#ifdef _WIN32

#include <windows.h>

#else // Linux

#include <sys/time.h>

#endif

#include "../Config/ACGDefines.hh"


//== NAMESPACES ===============================================================


namespace ACG {


//== CLASS DEFINITION =========================================================



class StopWatch
{
public:

  StopWatch() {
    #ifdef _WIN32
      QueryPerformanceFrequency(&freq_);
    #else
      starttime_.tv_sec  = 0;
      starttime_.tv_usec = 0;
      endtime_.tv_sec    = 0;
      endtime_.tv_usec   = 0;
    #endif
  }

  ~StopWatch() {}

  void start() {
    #ifdef _WIN32
      QueryPerformanceCounter(&starttime_);
    #else
      starttime_ = current_time();
    #endif
  }

  double restart() {
    #ifdef _WIN32
      QueryPerformanceCounter(&endtime_);
    #else
      endtime_ = current_time();
    #endif

    double t = elapsed();
    start();
    return t;
  }

  double stop() {
    #ifdef _WIN32
      QueryPerformanceCounter(&endtime_);
    #else
      endtime_ = current_time();
    #endif

    return elapsed();
  }

  double elapsed() const {
    #ifdef _WIN32
      return (double)(endtime_.QuadPart - starttime_.QuadPart)
           / (double)freq_.QuadPart * 1000.0f;
    #else
      return ((endtime_.tv_sec  - starttime_.tv_sec )*1000.0 +
              (endtime_.tv_usec - starttime_.tv_usec)*0.001);
    #endif
  }


private:

  #ifdef _WIN32
    LARGE_INTEGER starttime_, endtime_;
    LARGE_INTEGER freq_;
  #else // Linux
    timeval current_time() const {
      struct timeval tv;
      gettimeofday(&tv, 0);
      return tv;
    }

    timeval starttime_, endtime_;
  #endif

};


//=============================================================================
} // namespace ACG
//=============================================================================
#endif // ACG_STOPWATCH_HH defined
//=============================================================================