#ifndef NODE_MAP_REGISTRY_H

 #define NODE_MAP_REGISTRY_H

 #include <vector>

 template <typename G, typename E>

 class NodeMapRegistry {

 public:

 	typedef G Graph;

 	typedef E Node

 	typedef NodeMapBase<Graph, Node> NodeMapBase;

 protected:

 	typedef std::vector<NodeMapBase*> Container; 

 	Container container;

 	void add(NodeMapBase& map_base) {

 		if (map_base.graph) {

 			map_base.graph->node_maps.erase(map_base);

 		}

 		container.push_back(&map_base);

 		map_base.graph = this;

 		map_base.graph_index = container.size()-1;

 	} 

 	void erase(NodeMapBase& map_base) {

 		if (map_base.graph != this) return;

 		container.back()->graph_index = map_base.graph_index; 

 		container[map_base.graph_index] = container.back();

 		container.pop_back();

 		map_base.graph = 0;

 	}

 	void addNode(Node& node) {

 		typename Container::iterator it;

 		for (it = container.begin(); it != container.end(); ++it) {

 			(*it)->add(node);

 		}

 	}

 	void eraseNode(Node& node) {

 		typename Container::iterator it;

 		for (it = container.begin(); it != container.end(); ++it) {

 			(*it)->erase(node);

 		}

 	}

 	friend class NodeMapBase;

 };

 #endif