// -*- c++ -*-

#ifndef LEMON_CLEARABLE_GRAPH_EXTENDER_H

#define LEMON_CLEARABLE_GRAPH_EXTENDER_H

#include <lemon/invalid.h>

namespace lemon {

  template <typename _Base> 

  class ClearableGraphExtender : public _Base {

  public:

    typedef ClearableGraphExtender Graph;

    typedef _Base Parent;

    void clear() {

      Parent::getNodeObserverRegistry().clear();

      Parent::getEdgeObserverRegistry().clear();

      Parent::clear();

    }

  };

}

#endif