Linking error LNK2019: unresolved external symbol

Hi,

I have a miniproject in MVS2005 wich keeps bugging me with linking errors. I've read the documentation provided by MSV related to this error, and nothing seems to solve my problem.
So I came to you again for a helping hand.

ListaGenerica.h:

Code:

#include <iostream>
using namespace std;

template <class DataType>
struct NodeList
{
	DataType m_sData;
	NodeList* nxt;
	NodeList* prv;
};

template <class DataType>
class DLnkList
{
protected:
	NodeList<DataType>* pHead;
public:
	DLnkList()
	{
		pHead = new NodeList<DataType>;
		pHead = NULL;
	}
	~DLnkList()
	{
		while( pHead != NULL )    
		{
			NodeList<DataType>* pAux = pHead; 
			pHead = pAux->nxt;   
			delete pAux;  
			cout<<"destr";
		}
	}
	void AddNode(DataType Data);
	void ShowList();
};

The ListaGenerica.cpp:

Code:

#include "ListaGenerica.h"
#include <string>
#include <iostream>
using namespace std;

template <class DataType>
void  DLnkList<DataType>::AddNode(DataType Data)
{
	NodeList<DataType>* pNewNode = new NodeList<DataType>;
	pNewNode->nxt = pHead;
	pHead = pNewNode;
	pNewNode->m_sData = Data;
}

template <class DataType>
void DLnkList<DataType>::ShowList()
{
	NodeList<DataType>* pAux;
	pAux = pHead; 
	while( pAux != NULL )         
	{
		cout << endl << pAux->m_sData;
		pAux = pAux->nxt;
	}
}

And Main.cpp:

Code:

#include "ListaGenerica.h"
#include <string>
#include <iostream>
using namespace std;

int main(void)
{
	DLnkList<int>* ol = new DLnkList<int>;
	ol->AddNode(5555);
	ol->ShowList();
	delete ol;
}

and here are the errors:

Code:

1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall DLnkList<int>::ShowList(void)"
 (?ShowList@?$DLnkList@H@@QAEXXZ) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall DLnkList<int>::AddNode(int)"
 (?AddNode@?$DLnkList@H@@QAEXH@Z) referenced in function _main

When i copy the function definitions in main.cpp, te project builds. Why doesn't the builder see the ListaGenerica.cpp?
Any hints?
Tank you.

Unless your compiler supports "export", you'll have to put the AddNode and ShowList code in the header file.

Curious, because I've done the exact positioning of files in numerous projects and it worked.

That's the fun part about templates -- the template definition itself must be visible when the function is instantiated (unless and until the export keyword is supported).