#include <vector>

 #include <vector>

 #include <list>

 #include <list>

 #include <lemon/core.h>

 #include <lemon/core.h>

 //\ingroup graphbits

 //\ingroup graphbits

 //\file

 //\file

 //\brief Observer notifier for graph alteration observers.

 //\brief Observer notifier for graph alteration observers.

     const Container* container;

     const Container* container;

     typedef std::list<ObserverBase*> Observers;

     typedef std::list<ObserverBase*> Observers;

     Observers _observers;

     Observers _observers;

   public:

   public:

     // \brief Default constructor.

     // \brief Default constructor.

     //

     //

     }

     }

   protected:

   protected:

     void attach(ObserverBase& observer) {

     void attach(ObserverBase& observer) {

       observer._index = _observers.insert(_observers.begin(), &observer);

       observer._index = _observers.insert(_observers.begin(), &observer);

       observer._notifier = this;

       observer._notifier = this;

     }

     }

     void detach(ObserverBase& observer) {

     void detach(ObserverBase& observer) {

       _observers.erase(observer._index);

       _observers.erase(observer._index);

       observer._index = _observers.end();

       observer._index = _observers.end();

       observer._notifier = 0;

       observer._notifier = 0;

     }

     }

   public:

   public:

     // \brief Notifies all the registed observers about an item added to

     // \brief Notifies all the registed observers about an item added to