real-clock.hpp

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/*
  REAL-CLOCK.hpp  -  convenience front-end to access the system clock

   Copyright (C)
     2012,            Hermann Vosseler <Ichthyostega@web.de>

  **Lumiera** is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the
  Free Software Foundation; either version 2 of the License, or (at your
  option) any later version. See the file COPYING for further details.

*/

#ifndef VAULT_REAL_CLOCK_H
#define VAULT_REAL_CLOCK_H


#include "lib/error.hpp"
#include "lib/time/timevalue.hpp"

namespace vault {

  using lib::time::Time;
  using lib::time::TimeValue;
  using lib::time::Offset;
  
  
  class RealClock
    {
      
      
    public:
      
      static Time
      now()
        {
          return Time{_readSystemTime()};
        }
      
      static bool
      wasRecently (Time event)
        {
          Offset past{event, now()};
          return Time::ZERO <= past
             and past < CONSIDERED_RECENT;
        }
      
      
    private:
      static TimeValue _readSystemTime();
      static const Offset CONSIDERED_RECENT;
    };
  
  
  
} // namespace vault
#endif