C++ 11 variable parameters using examples

#include <iostream>
#include <initializer_list>
using namespace std;
int get_sum(int, initializer_list<int>);
int main(int argc, char *argv[])
{ 
    cout << get_sum(2, {1,2,3}) << endl;
    return 0;
}
int get_sum(int i, initializer_list<int> il) {
    int sum = 0;
    sum += i;
    for (auto a : il) {
        sum += a;
    }
    return sum;
}