#include <iostream>
#include <vector>

using namespace std;

template <typename T>
void chk_for_else(T& items) {
    if (!items.empty()) for (auto i: items) {
        cout << i << endl;
    } else {
        cout << "else" << endl;
    }
}

int main()
{
    vector<int> items;
    chk_for_else(items);
    items.assign({1, 2, 3});
    chk_for_else(items);
    return 0;
}