text: //
  // Stopwatch.h
  //
  // $Id: //poco/1.7/Foundation/include/Poco/Stopwatch.h#1 $
  //
  // Library: Foundation
  // Package: DateTime
  // Module:  Stopwatch
  //
  // Definition of the Stopwatch class.
  //
  // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
  // and Contributors.
  //
  // SPDX-License-Identifier:	BSL-1.0
  //
  
  
  #ifndef Foundation_Stopwatch_INCLUDED
  #define Foundation_Stopwatch_INCLUDED
  
  
  #include "Poco/Foundation.h"
  #include "Poco/Clock.h"
  
  
  namespace Poco {
  
  
  class Foundation_API Stopwatch
  	/// A simple facility to measure time intervals
  	/// with microsecond resolution.
  {
  public:
  	Stopwatch();
  	~Stopwatch();
  
  	void start();
  		/// Starts (or restarts) the stopwatch.
  		
  	void stop();
  		/// Stops or pauses the stopwatch.
  	
  	void reset();
  		/// Resets the stopwatch.
  		
  	void restart();
  		/// Resets and starts the stopwatch.
  		
  	Clock::ClockDiff elapsed() const;
  		/// Returns the elapsed time in microseconds
  		/// since the stopwatch started.
  		
  	int elapsedSeconds() const;
  		/// Returns the number of seconds elapsed
  		/// since the stopwatch started.
  
  	static Clock::ClockVal resolution();
  		/// Returns the resolution of the stopwatch.
  
  private:
  	Stopwatch(const Stopwatch&);
  	Stopwatch& operator = (const Stopwatch&);
  
  	Clock            _start;
  	Clock::ClockDiff _elapsed;
  	bool             _running;
  };
  
  
  //
  // inlines
  //
  inline void Stopwatch::start()
  {
  	if (!_running)
  	{
  		_start.update();
  		_running = true;
  	}
  }
  
  
  inline void Stopwatch::stop()
  {
  	if (_running)
  	{
  		Clock current;
  		_elapsed += current - _start;
  		_running = false;
  	}
  }
  
  
  inline int Stopwatch::elapsedSeconds() const
  {
  	return int(elapsed()/resolution());
  }
  
  
  inline Clock::ClockVal Stopwatch::resolution()
  {
  	return Clock::resolution();
  }
  
  
  } // namespace Poco
  
  
  #endif // Foundation_Stopwatch_INCLUDED
  