Link List Template errors?

In a class I took over a year ago I learned how to make a link list template. I saved that template and am now looking back it and trying to use it again for something else. However when I try to run the program with my template I get many errors, some of which are the same. They have to do with me using 'ostream' and 'out' and the compiler not liking that.
Here is the template I am attempting to use:

Code:

---


template <class T>
class listClass
{
public:
        listClass(){head=tail=cur=NULL;}
        ~listClass()
        {
                free();
        }
        listClass(const listClass<T> &source)
        {head=tail=cur=NULL; *this=source;}
        const listClass<T> & operator=
                (const listClass<T> &right);
        bool isEmpty()const{return head==NULL;}
        bool isFull()const{return false;}
        bool isCurEnd()const{return cur==tail;}
        void addItemToHead(const T& item);
        void addItemToTail(const T& item);
        const T& getFirst()const;
        const T& getLast()const;
        void removeFirst();
        void removeLast();

        void resetCur(){cur=head;}
        void print(ostream &out)const;
        void printCur(ostream &out);
private:
        template <class T>
        class nodeClass
        {
        public:
                T data;
                nodeClass<T> *next;
                nodeClass()
                {next=NULL;}
        };
        void free();
        nodeClass<T> *head, *tail, *cur;
};
template <class T>
void listClass<T>::addItemToHead(const T& item)
{
        nodeClass<T> *ptr=new nodeClass<T>;
        ptr->data=item;
        ptr->next=head;
        head=ptr;
        if(tail==NULL)
        {
                cur=tail=ptr;
        }
}

template <class T>
void listClass<T>::addItemToTail(const T& item)
{
        if(isEmpty())
                addItemToHead(item);
        else
        {
                nodeClass<T> *ptr=new nodeClass<T>;
                ptr->data=item;
                tail->next=ptr;
                tail=ptr;
        }
}

template <class T>
void listClass<T>::print(ostream &out)const
{
        nodeClass<T> *ptr = head;
        while(ptr!=NULL)
        {
                out << ptr->data << endl;
                ptr=ptr->next;
        }
}
template <class T>
const T& listClass<T>::getFirst()const
{
        if(isEmpty())
        {
                cerr << "Empty list\n";
                exit(41);
        }
        return head->data;
}
template <class T>
const T& listClass<T>::getLast()const
{
        if(isEmpty())
        {
                cerr << "Empty list\n";
                exit(41);
        }
        return tail->data;
}

template <class T>
void listClass<T>::removeFirst()
{
        if(isEmpty())
        {
                cerr << "Empty list\n";
                exit(41);
        }
        if(cur==head)
                cur=head->next;
        nodeClass<T> *ptr=head;
        head=head->next;
        delete ptr;
        if(head==NULL)
                tail=head;
}
template <class T>
void listClass<T>::removeLast()
{
        if(isEmpty())
        {
                cerr << "Empty list\n";
                exit(41);
        }
        if(head==tail)//one node
                removeFirst();
        else
        {
                nodeClass<T> *ptr=head;
                while(ptr->next->next!=NULL)//while node after ptr is not tail
                        ptr=ptr->next;
                if(cur==tail)
                        cur=ptr;
                delete tail;
                tail=ptr;
                tail->next=NULL;
        }
}

template <class T>
void listClass<T>::free()
{
        while(!isEmpty())
                removeFirst();   
}

template <class T>
const listClass<T> & listClass<T>::operator=
(const listClass<T> &right)
{
        if(this==&right)
                return right;

        free();

        nodeClass<T> *ptr=right.head;
        while(ptr!=NULL)
        {
                addItemToTail(ptr->data);
                ptr=ptr->next;
        }

        return *this;
}
template <class T>
void listClass<T>::printCur(ostream &out)
{
        if(cur==NULL)
        {
                cerr << "Invalid current pointer\n";
                exit(42);
        }
        out << cur->data;
        cur=cur->next;
}

---

Here's my main.cpp (doesn't really have anything in it):

Code:

---

#include <iostream>
#include <fstream>

#include "List.h"

using namespace std;

int main()
{


        return 0;
}

---

I can't figure out why I'm getting errors since this template worked years ago and I haven't changed anything about it. Any help is appreciated.

The compiler can't find the reference to ostream because its in the namespace std.

Notice in main you use namespace after you've included the file. Either change the order, or change your header file to explicitly use std::ostream (preferred) or using namespace std in the header file.

Hope that helps...

You should post the errors here, but 2 things first:

• make sure the template class is not split in a header and a cpp file; it should be all in a header
• make sure you include in the listClass header all the files you need (<fstream>, etc.) and you use the fully qualified names (std::ostream, etc.)