Turning a tuple to a string

gistfile1.cpp

#include <iostream>
#include <vector>
#include <string>

namespace detail
{
    template <int... Is>
    struct index { };

    template <int N, int... Is>
    struct gen_seq : gen_seq<N - 1, N - 1, Is...> { };

    template <int... Is>
    struct gen_seq<0, Is...> : index<Is...> { };
}

template<typename... Ts, int... Is>
std::string tuple_to_string(std::tuple<Ts...>& tup, detail::index<Is...>)
{
    std::string result;
    auto discard = { 0, ((result += std::to_string(std::get<Is>(tup))), 0)... };
    (void)discard;
    return result;
}

template<typename... Ts>
std::string tuple_to_string(std::tuple<Ts...>& tup)
{
    return tuple_to_string(tup, detail::gen_seq<sizeof...(Ts)>());
}

int main()
{
    std::tuple<int, char, double> tup{ 1, 'a', 2.2 };
    std::string str = tuple_to_string(tup);
    std::cout << str;
}