Problemas com typedef

graph.cpp

#include "graph.h"

Node::Node(int f1, int f2)
{
    field1 = f1;
    field2 = f2;
    next = 0;
}

Node::~Node()
{
    if(next)
    {
        delete next;
    }
}

void Node::setNext(Node *node)
{
    next = node;
}

std::ostream& operator<<(std::ostream &out, Node& node)
{
    out << node.field1 << ":" << node.field2;
    return out;
}

graph.h

#ifndef GRAPH_H
#define GRAPH_H

#include <ostream>

class Node
{
public:
    Node(int f1, int f2);
    ~Node();

    void setNext(Node* node);

    friend std::ostream& operator<< (std::ostream& out, Node& node);

private:
    int field1;
    int field2;
    Node* next;
};


#endif // GRAPH_H

main.cpp

#include <iostream>

#include "graph.h"

int main()
{
    Node* node = new Node(10, 20);

    std::cout << *node << std::endl;

    Node n1(20, 30);
    n1.setNext(node);
    std::cout << n1 << std::endl;

    return 0;
}