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|      3  |      3  | 
|      4 #include <vector> |      4 #include <vector> | 
|      5  |      5  | 
|      6 using namespace std; |      6 using namespace std; | 
|      7  |      7  | 
|      8 namespace hugo { |      8 namespace lemon { | 
|      9  |      9  | 
|     10 /**  |     10 /**  | 
|     11  * Registry class to register edge or node maps into the graph. The |     11  * Registry class to register edge or node maps into the graph. The | 
|     12  * registry helps you to implement an observer pattern. If you add |     12  * registry helps you to implement an observer pattern. If you add | 
|     13  * or erase an edge or node you must notify all the maps about the |     13  * or erase an edge or node you must notify all the maps about the |