Question

ERROR CODE:

    CList<CString,const char*> test;

ERROR INFO:
    ECLIPSE / UBUNTU 10

/home/latyas/workspace/CList/Debug/../test.cpp:7: undefined reference
            to `CList<CString, char const*>::CList()'

I have already defined this constructor:

template<typename T1, typename T2> CList<T1, T2>::CList() :
        m_nHead(0), m_nTail(0),m_nCount(0) {
}

Why am I getting this error?

updated:

#include <iostream>
#include "CString.h"
#include "CList.h"

int main()
{
    CList<CString,const char*> test;
    test.AddHead("test");
    return 0;
}


/*
 * CList.h
 *
 *  Created on: 2012-3-31
 *      Author: latyas
 */

#ifndef CLIST_H_
#define CLIST_H_


template<typename T1,typename T2> class CList {
public:
    struct CNode {
        CNode* pNext;
        CNode* pPrev;
        T1 data;
    };
    CList();
    ~CList();
    long GetHead();
    long GetTail();
    long GetNext(long, T1&); 
    long GetCount();
    long AddHead(T2);
    long AddTail(T2);
    long RemoveAt(long);

private:
    CNode* m_nHead;
    CNode* m_nTail;
    long m_nCount;

};

#endif /* CLIST_H_ */

/*
 * CList.cpp
 *
 *  Created on: 2012-3-31
 *      Author: latyas
 */

#include "CList.h"
#include <cstdlib>
#include <iostream>

/
template<typename T1, typename T2> CList<T1, T2>::CList() :
        m_nHead(0), m_nTail(0),m_nCount(0) {
}
template<class T1, class T2> CList<T1, T2>::~CList() {
    std::cout << "~CList()";

Answer 1

There is no .cpp file for templated classes, so all your implementation must be done in the .h file only..

/*
 * CList.h
 */

#ifndef CLIST_H_
#define CLIST_H_


template<typename T1,typename T2> class CList {
public:
    struct CNode {
        CNode* pNext;
        CNode* pPrev;
        T1 data;
    };
    CList();
    ~CList();
    long GetHead();
    long GetTail();
    long GetNext(long, T1&); 
    long GetCount();
    long AddHead(T2);
    long AddTail(T2);
    long RemoveAt(long);

private:
    CNode* m_nHead;
    CNode* m_nTail;
    long m_nCount;

};

#endif /* CLIST_H_ */

/* ========== Implementation of Clist class ============ */

template<typename T1, typename T2> CList<T1, T2>::CList() :
        m_nHead(0), m_nTail(0),m_nCount(0) {
}
template<class T1, class T2> CList<T1, T2>::~CList() {
    std::cout << "~CList()";