c++ - I have included a template function declaration in a header file and the defintion of the function is written in the .cpp file

I have declared a template function in .h file and defined in a .cpp file and calling the function from another .cpp file.

i am getting the following error

/tmp/ccJg5vwy.o: In function main':
main.cpp:(.text+0x8f): undefined reference toshort temp < int, std::allocator < int > >(std::__cxx11::list > const&)'

collect2: error: ld returned 1 exit status

my files are:

//main.cpp

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

int main(){

    list arr(5);
    for (int i=0;i<5;i++)
        arr.push_back(i);
    fun1();
    fun2();
    temp(arr);
    return 0;
}

//a.h

#include 
using namespace std;
void fun1();
void fun2();
template 
    short temp(const list& val);

//fun2.cpp

#include"a.h"
#include
using namespace std;
void fun2(){
    cout<<"I am in function2\n";
}

//a.cpp

#include "a.h"
#include
using namespace std;
void fun1()
{
        cout<<"I am in function1\n";
}
template 

    short temp(const list& val){
        cout<<"inside the template function\n";
        typename list::const_iterator iter=val.begin();
         while (iter != val.end())
                {
                       cout<< *iter << endl;
                       ++iter;
                }
         cout<<"leaving the template function\n";
            return 0;

    }

and i am compiling the files in the following format

g++ a.cpp fun2.cpp main.cpp

I am not getting why there is a linking problem.

I have also tried by changing a.cpp and a.h to the following format but still i am getting the error

//a.cpp

#include "a.h"
#include
using namespace std;
void fun1()
{
    cout<<"I am in function1\n";
}

template 
    short temp(const list& val){
        cout<<"inside the template function\n";
        typename list::const_iterator iter=val.begin();
        while (iter != val.end())
                {
                       cout<< *iter << endl;
                       ++iter;
                }
         cout<<"leaving the template function\n";

            return 0;
    }   

//a.h

#include 
using namespace std;
void fun1();
void fun2();

template 
short temp(const list& val);

in this case error is

/tmp/cce0eJj9.o: In function main':
main.cpp:(.text+0x8f): undefined reference toshort temp< int >(std::__cxx11::list > const&)'
collect2: error: ld returned 1 exit status