Why do I get “unresolved external symbol” errors when using templates? [duplicate]

Answer 1

For each file that include the .h file you should be to insert both lines:

#include "MyfileWithTemplatesDeclaration.h"
#include "MyfileWithTemplatesDefinition.cpp"

---

sample

#include "list.h"
    #include "list.cpp" //<---for to fix bug link err 2019



    int main(int argc, _TCHAR* argv[])
    {
        list my_list;
        my_list.add_end(3);
    .
    .
    } 

also, you dont forget to place your declaration class among centinel constants

#ifndef LIST_H
#define LIST_H
#include 
.
.
template 
class list
{
private:
    int m_size,
        m_count_nodes;
    T m_line;
    node *m_head;
public:
    list(void);
    ~list(void);
    void add_end(T);
    void print();
};
#endif