Unresolved external symbol

[herooftime1000]

Hello! I'm running into a problem with my assignment. I'm trying to make a ring class with a template and a base class. This is my header.

#pragma once
#include "LinkedSortedList.h"

template<class itemType>
class Ring :
	public LinkedSortedList<itemType>
{
public:
	Ring();
	~Ring();
	void insert(const itemType&);
	void deleteItem(const itemType&);
	void display();
};

And this is my .cpp file.

#include "Ring.h"


template<class itemType>
Ring<itemType>::Ring()
{
} // default constructor


template<class itemType>
Ring<itemType>::~Ring()
{
} // default destructor

template<class itemType>
void Ring<itemType>::insert(const itemType& item) {
	LinkedSortedList<itemType>::insertSorted(item);
}

template<class itemType>
void Ring<itemType>::deleteItem(const itemType& item) {
	LinkedSortedList<itemType>::removeSorted(item);
}

template<class itemType>
void Ring<itemType>::display() {
	cout << "The sorted list contains " << endl;
	for (int pos = 1; pos <= LinkedSortedList<itemType>::getLength(); pos++)
	{
		cout << LinkedSortedList<itemType>::getEntry(pos) << " ";
	} // end for
}

But when I make a new object in main and run them, I get these errors.

Error LNK2019 unresolved external symbol "public: __thiscall Ring<int>::Ring<int>(void)" (??0?$Ring@H@@QAE@XZ) referenced in function _main LinkedSortedList

Error LNK2019 unresolved external symbol "public: void __thiscall Ring<int>::insert(int const &)" (?insert@?$Ring@H@@QAEXABH@Z) referenced in function _main LinkedSortedList

I thought I got the templates and everything working. Is it the base class that's the problem? I worked with the base class by itself and it works fine.

Please help.

[herooftime1000]

Never mind. In the main file, add both the .h file and the .cpp file to avoid error LNK2019

[E0p9LyTq]

You should never include a .cpp file in another one, only include header files.

You are creating a template, all your code should be in your header file.