linked list - Template error : undefined reference

I am trying to create a class linkedList using template but when I compile it the IDE gives an error :
undefined reference to `listType::add(int)
I am not understanding why ?

linkedList.h

#ifndef LINKEDLISTS_H_INCLUDED
#define LINKEDLISTS_H_INCLUDED
#include "struct.h"
template 


class listType
{
public:

void add(type1);
void print();
private:
node *head;
};



#endif // LINKEDLISTS_H_INCLUDED

---

LinkedList.cpp

#include "linkedLists.h"

#include "struct.h"
#include 
using namespace std;

template 
void listType::add(type1 temp)
{
node *t;
t->value=temp;
t->link=head;

head=t;
}
template 
void listType::print()
{
node *p;
p=head;
while(p!=NULL)
{


    cout<value<    p=p->link;
}

}

---

Struct.h

#ifndef STRUCT_H_INCLUDED
#define STRUCT_H_INCLUDED
template 

struct node
{

type1 value;
node *link;

};


#endif // STRUCT_H_INCLUDED

---

main.cpp

#include 
#include "linkedLists.h"
using namespace std;


int main()
{
listType  test;
test.add(5);


}

---

Answer

You can't have the implementation of templated classes and functions in the cpp file.

The code has to be in the header, so the including files can see the implementation, and instantiate the correct version with their template argument type.