#ifndef NODE_MAP_BASE_H

#define NODE_MAP_BASE_H

template <class G, class K>

class NodeMapBase {

public:

	typedef G Graph;

	typedef K KeyType;

	MapBase() : graph(0) {}

	MapBase(Graph& g) : graph(&g) {graph.node_maps.add(*this);}

	virtual ~MapBase() {graph.node_maps.erase(*this);}	

protected:

	Graph* graph;

	int graph_index;

	virtual void add(const KeyType&) = 0;

	virtual void erase(const KeyType&) = 0;

	friend class Graph;

};

#endif