Question

I’m having trouble with compiling my template class. This is my list.cpp

using namespace std;

template <class T>
List<T>::List()
{
    length = 0;
}

template <class T>
List<T>::~List()
{

}


template <class T>
List<T> & List<T>::operator=(const List<T> & rhs)
{
    List<T> hha;
    return hha;
}


template <class T>
int List<T>::size()
{
    return length;
}

ANd this is my list.h

#ifndef _LIST_H_
#define _LIST_H_

#include <iterator>
#include <ostream>

using namespace std;

template <class T>
class List
{
    private:

        class ListNode
        {
            public:
                ListNode();
                ListNode(const T element);

                ListNode *next;
                T data;
        };

    public:

        // big3
        List();
        ~List();
        List<T> & operator=(const List<T> & rhs);

        int size();
        bool empty();
        void print(ostream & os) const;


    private:
        ListNode * head;
        ListNode * tail;
        int length;
};

#include "list.cpp"

#endif

when I run g++ list.cpp

I get errors

expected constructor, destructor, or type conversion before ‘<’ token

for definitions of constructor, destructor, and operator…

I don’t know what seems to be wrong

Answer 1

The template implementation goes in the header.

It is a bit of a hack but it is how it is done.