[bnc]

I have included all the header file declartions correctly. But still I am getting errors...

header file:test.h

#include <iostream>

template <class T>
class MyVec
{
public:
        MyVec();
        ~MyVec();
private:
        T* array;
};

source file:test.cpp

#include "test.h"

template <class T>
MyVec<T>::MyVec()
{
        array = NULL;
}

template<class T>
MyVec<T>::~MyVec()
{
        if(array != NULL)
        {
                delete[] array;
                array = NULL;
        }
}

main file:

#include "test.h"

int main(void)
{
        MyVec<int> veci;
        return 0;
}

output:
/tmp/ccQfYS4M.o: In function `main':
main.cpp:(.text+0x8b): undefined reference to `MyVec<int>::MyVec()'
main.cpp:(.text+0x9b): undefined reference to `MyVec<int>::~MyVec()'
collect2: ld returned 1 exit status

This post has been edited by bnc: 21 January 2011 - 06:11 AM

[Munawwar]

For template classes, the definition and declaration should be in the same file. Read this and the reason as to why things work this way.

This post has been edited by Munawwar: 21 January 2011 - 06:33 AM

[JackOfAllTrades]

You should implement the functions inside the .h file for templates.

[bnc]

thanks Munawwar and JackOfAllTrades...

This post has been edited by bnc: 21 January 2011 - 07:06 AM