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    16     typedef _Base Parent;  | 
    16     typedef _Base Parent;  | 
    17     typedef typename Parent::Node Node;  | 
    17     typedef typename Parent::Node Node;  | 
    18     typedef typename Parent::Edge Edge;  | 
    18     typedef typename Parent::Edge Edge;  | 
    19   | 
    19   | 
    20     void clear() { | 
    20     void clear() { | 
    21       Parent::getObserverRegistry(Node()).clear();  | 
    21       Parent::getNotifier(Node()).clear();  | 
    22       Parent::getObserverRegistry(Edge()).clear();  | 
    22       Parent::getNotifier(Edge()).clear();  | 
    23       Parent::clear();  | 
    23       Parent::clear();  | 
    24     }  | 
    24     }  | 
    25   | 
    25   | 
    26   };  | 
    26   };  | 
    27   | 
    27   | 
    34     typedef typename Parent::Node Node;  | 
    34     typedef typename Parent::Node Node;  | 
    35     typedef typename Parent::UndirEdge UndirEdge;  | 
    35     typedef typename Parent::UndirEdge UndirEdge;  | 
    36     typedef typename Parent::Edge Edge;  | 
    36     typedef typename Parent::Edge Edge;  | 
    37   | 
    37   | 
    38     void clear() { | 
    38     void clear() { | 
    39       Parent::getObserverRegistry(Node()).clear();  | 
    39       Parent::getNotifier(Node()).clear();  | 
    40       Parent::getObserverRegistry(UndirEdge()).clear();  | 
    40       Parent::getNotifier(UndirEdge()).clear();  | 
    41       Parent::getObserverRegistry(Edge()).clear();  | 
    41       Parent::getNotifier(Edge()).clear();  | 
    42       Parent::clear();  | 
    42       Parent::clear();  | 
    43     }  | 
    43     }  | 
    44   | 
    44   | 
    45   };  | 
    45   };  | 
    46   | 
    46   |