Error message (undefined reference) Linking Issue.

Hi all,

I am writing a linked list for an assignment where I am using classes
for nodes and a linked list class to handle the node objects.

However when I try and link the object files I get the following error
message:

llist.o(.text+0xb6):llist.cpp:undefined reference to 'node::node[in-
charge](int, int, std::basic_string<char, std::char_traits<char>,
std::allocator<char> >)' collect2 ld returned 1 exit status.

I just can't see what it is, so some help would be very much
appreciated.

Here's the code...

#include <iostream>
#include "llist.h"

using namespace std;

int main()
{
  LinkedList l; //instantiate a linked list.

  if (l.isListEmpty())
    cout << "Empty!" << endl;
  else
    cout << "Non Empty" << endl;
  return 0;
}

/*********************************/

/*
  llist.h - define a list
*/

#include "node.h"

typedef node* PNode;

class LinkedList
{
public:
  LinkedList();
  int setHead();
  int isListEmpty();
  void addNode();

private:
  PNode head;
};

/*********************************/

// llist.cpp

#include <string>
#include "llist.h"

using namespace std;

LinkedList::LinkedList()
{
  setHead();
}

int LinkedList::setHead()
{
  head = NULL;
}

int LinkedList::isListEmpty()
{
  return (head == NULL);
}

void LinkedList::addNode()
{
  PNode tmp;
  string s;
  s = "London";
  tmp = new node(2,4,s); // << This line is what I am
trying to do before I get the linking problem
  head = tmp;
}

/**********************************/

//node.h - define a node.

#include <string>
using namespace std;

class node
{
public:
  node(int a, int b, string name);
  void setX(int a);
  void setY(int b);
  void setName(string name);
  void setNext();
  int getX();
  int getY();
  string getName();
  int getNext();

private:
  int x;
  int y;
  string cityname;
  node* next;
};

/***********************************/

//node.cpp

#include <string>
#include "node.h"

using namespace std;

node::node(int a, int b, string name)
{
  setX(a);
  setY(b);
  setName(name);
  setNext();
}

void node::setX(int a)
{
  x = a;
}

void node::setY(int b)
{
  y = b;
}

void node::setName(string name)
{
  cityname = name;
}

void node::setNext()
{
  next = NULL;
}

int node::getX()
{
  return x;
}

int node::getY()
{
  return y;
}

string node::getName()
{
  return cityname;
}

int node::getNext()
{
  return (next == NULL);
}

/******************************/

Many many thanks.