storing a number of functions in a vector and accessing them

snfv.cpp

#include <iostream> /// std::cout; std::endl;
#include <vector> /// std::vector;

int display (int, int);

int sum (int n1, int n2)
{
    return n1 + n2;
}

int subtract (int n1, int n2)
{
    return n1 - n2;
}

int multiply (int n1, int n2)
{
    return n1 * n2;
}

int divide (int n1, int n2)
{
    return n1 / n2;
}

int main()
{
    std::vector<int (*)(int, int)> vec_func; /// equivalent to int (*vec_func) (int, int) that stores every pointed function in every element

    vec_func.push_back(sum); /// equivalent to vec_func.push_back(&sum); --> automatic conversion to pointer when a function is pass by argument which is std::vector <int (*) (int, int)> vec_func;
    vec_func.push_back(subtract); /// same as the upper comment 
    vec_func.push_back(multiply);
    vec_func.push_back(divide);

    std::vector<int (*) (int, int)>::iterator it = vec_func.begin(); /// denotes  the 1st element for modified loop

    for (unsigned i = 0; it != vec_func.end(); ++it, ++i)
        std::cout << vec_func[i](22, 22) << std::endl; /// accessing every element and use them and displays the result

    return 0;
}