I'm currently trying to overload the '<<' operator but keep receiving this error message: 

> 
> In function 'std::ostream& operator<<(std::ostream&, const :Linkedlist&)':
>  Linkedlist.cpp:148:34: error: no match for 'operator<<' in 'std::operator<< [with \_CharT = char, \_Traits = std::char\_traits, \_Alloc = std::allocator](((std::basic\_ostream&)((std::ostream\*)outs)), ((const std::basic\_string&)((const std::basic\_string\*)(& Node::node::fetchData()())))) << " "'
>  Linkedlist.cpp:142:15: note: candidate is: std::ostream& operator<<(std::ostream&, const Linkedlist&)
> 
> 
> 

The overloaded operator function is declared as a friend member function in the Linkedlist implementation file because it will access a private member variable (head\_ptr):

```
std::ostream& operator <<(std::ostream& outs, const Linkedlist& source)
{
    node* cursor;
    for(cursor = source.get_head(); cursor != NULL; cursor = cursor->fetchLink())
    {
        outs << cursor->fetchData() << " ";
    }

    return(outs);
}

```

This is the function prototype in the Linkedlist header file:

```
friend std::ostream& operator <<(std::ostream& outs, const Linkedlist& source);

```

I've crawled the web and haven't been able to find a solution so far. Any advice would be great!