stop_watch.hpp

// FEAT3: Finite Element Analysis Toolbox, Version 3
// Copyright (C) 2010 by Stefan Turek & the FEAT group
// FEAT3 is released under the GNU General Public License version 3,
// see the file 'copyright.txt' in the top level directory for details.
 
#pragma once
 
// includes, FEAT
#include <kernel/util/time_stamp.hpp>
 
namespace FEAT
{
  class StopWatch
  {
  private:
    TimeStamp _start_time;
    TimeStamp _stop_time;
    bool _running;
    long long _micros;
 
  public:
    StopWatch() :
      _running(false),
      _micros(0ll)
    {
    }
 
    void reset()
    {
      _running = false;
      _micros = 0ll;
    }
 
    void start()
    {
      if(!_running)
        _start_time.stamp();
      _running = true;
    }
 
    void stop()
    {
      if(_running)
      {
        _stop_time.stamp();
 
        // update elapsed time
        _micros += _stop_time.elapsed_micros(_start_time);
      }
      _running = false;
    }
 
    bool running() const
    {
      return _running;
    }
 
    double elapsed() const
    {
      return 1E-6 * double(elapsed_micros());
    }
 
    long long elapsed_micros() const
    {
      if(!_running)
        return _micros;
      else
      {
        // stop-watch is currently running, so compute current time
        return _micros + TimeStamp().elapsed_micros(_start_time);
      }
    }
 
    String elapsed_string(TimeFormat format = TimeFormat::s_m) const
    {
      return TimeStamp::format_micros(elapsed_micros(), format);
    }
 
    String percent_of(const StopWatch& total_watch, const String& prefix = " [", const String& postfix = "% ]") const
    {
      return prefix + stringify_fp_fix(100.0 * this->elapsed() / total_watch.elapsed(), 3, 7) + postfix;
    }
  }; // class StopWatch
} // namespace FEAT