template function instancing

#include "pch.h"
#include <iostream>
#include <functional>

using namespace std;

template <typename T> int sortUp(T a, T b)
{
    return a > b;
}

template <typename T> int sortDown(T a, T b)
{
    return a < b;
}



int main()
{
    std::function<int(int, int)> fPtr[2] = { sortUp<int>, sortDown<int> };
    std::cout << fPtr[0](1, 2) << std::endl;
    std::cout << fPtr[1](1, 2) << std::endl;

    std::function<int(char, char)> fPtrC[2] = { sortUp<char>, sortDown<char> };
    std::cout << fPtrC[0]('a', 'z') << std::endl;
    std::cout << fPtrC[1]('a', 'z') << std::endl;
}