template <typename Iter, typename ValueType = typename Iter::value_type>
std::vector<ValueType> get_even_value(Iter first, Iter last) {
    std::vector<ValueType> v;
    for (; first != last; ++first) {
        if (*first % 2 == 0) {
            v.push_back(*first);
        }
    }

    return v;
}

int main() {
    std::set<int64_t> values1 = {1,2,4,5,6,8,9};
    //(typename std::set<char>::value_type) ch = 'z';
    //char ch = 'z';
    std::vector<int64_t> result1 = get_even_value(values.begin(), values.end()); // 2,4,6,8

    std::vector<int> values2 = {1,2,4,5,6,8,9};
    std::vector<int> result2 = get_even_value(values.begin(), values.end()); // 2,4,6,8


    std::vector<int> values3 = {1,2,4,5,6,8,9};
    std::vector<double> result3 = get_even_value<std::vector<int>::iterator, double>(values.begin(), values.end()); // 2,4,6,8
}