c++ - How to use function with template, When it declare in .hpp file and implementation in .cpp file

I want to declare function, with template value, in header file. And implementation it in cpp file and call the function from main.
But i want to do it without using class.
How do i do it?

Thanks

temp.hpp :

#ifndef TEMP_HPP
#define TEMP_HPP
template
void show( T a);        
#endif /* TEMP_HPP */

temp.cpp :

#include 
#include "temp.hpp"
template
void show( T a) 
{ 
    std::cout << "a:" << a << std::endl;
}

main :

#include 
#include "TextTable.h"
#include "temp.hpp"

int main()
{

    int a = 5;
    float b = 2.5;
    show(a); 
    return 0;
}