template<typename T>
class VertexList
{
	public:
		class iterator:
			public std::list<std::pair<Vertex<T>, VertexList<T> *> >::iterator
		{
			public:
				VertexList<T> operator*();
		};
		// ...
		iterator begin()
		{
			return data.begin();
		}
	private:
		std::list<std::pair<Vertex<T>, VertexList<T> *> > data;

};