Observable.h

Go to the documentation of this file.

/* This software and supporting documentation are distributed by
 *     Institut Federatif de Recherche 49
 *     CEA/NeuroSpin, Batiment 145,
 *     91191 Gif-sur-Yvette cedex
 *     France
 *
 * This software is governed by the CeCILL-B license under
 * French law and abiding by the rules of distribution of free software.
 * You can  use, modify and/or redistribute the software under the
 * terms of the CeCILL-B license as circulated by CEA, CNRS
 * and INRIA at the following URL "http://www.cecill.info".
 *
 * As a counterpart to the access to the source code and  rights to copy,
 * modify and redistribute granted by the license, users are provided only
 * with a limited warranty  and the software's author,  the holder of the
 * economic rights,  and the successive licensors  have only  limited
 * liability.
 *
 * In this respect, the user's attention is drawn to the risks associated
 * with loading,  using,  modifying and/or developing or reproducing the
 * software by the user in light of its specific status of free software,
 * that may mean  that it is complicated to manipulate,  and  that  also
 * therefore means  that it is reserved for developers  and  experienced
 * professionals having in-depth computer knowledge. Users are therefore
 * encouraged to load and test the software's suitability as regards their
 * requirements in conditions enabling the security of their systems and/or
 * data to be ensured and,  more generally, to use and operate it in the
 * same conditions as regards security.
 *
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL-B license and that you accept its terms.
 */
 
 
#ifndef ANA_OBSERVER_OBSERVABLE_H
#define ANA_OBSERVER_OBSERVABLE_H
 
 
//--- header files ------------------------------------------------------------
 
#include <cartobase/smart/sharedptr.h>
#include <set>
#include <string>
 
 
namespace anatomist
{
  //--- forward declarations --------------------------------------------------
 
  class Observer;
 
 
  //--- class declarations ----------------------------------------------------

 
  class Observable : virtual public carto::SharedObject
  {
  public:
    Observable();

    virtual ~Observable();


    void addObserver(Observer* observer);

    void deleteObserver(Observer* observer);

    void deleteObservers();

    int countObservers() const;

    virtual void notifyObservers(void* arg = 0);

    virtual void notifyUnregisterObservers();



    bool hasChanged() const;
    bool obsHasChanged( int ) const;
    bool obsHasChanged( const std::string & ) const;

    void setChanged() const;

 
  protected:
    void clearChanged() const;

    void obsSetChanged( int, bool = true ) const;
    void obsSetChanged( const std::string &, bool = true ) const;

 
  private:
    struct Private;
 
    mutable bool _changed;
    mutable bool _updating;
    Private     *d;

    std::set<Observer*> _observers;
  };
 
 
  //--- inline methods --------------------------------------------------------
 
  inline
  bool
  Observable::hasChanged() const
  {
    return _changed;
  }
 
 
  inline
  void
  Observable::setChanged() const
  {
    _changed = true;
  }
 
}
 
 
#endif