#include <tuple>
#include <iostream>
#include <type_traits>

template <size_t n, typename... T>
typename std::enable_if<(n >= sizeof...(T))>::type
    print_tuple(std::ostream&, const std::tuple<T...>&)
{}

template <size_t n, typename... T>
typename std::enable_if<(n < sizeof...(T))>::type
    print_tuple(std::ostream& os, const std::tuple<T...>& tup)
{
    if (n != 0)
        os << ", ";
    os << std::get<n>(tup);
    print_tuple<n+1>(os, tup);
}

template <typename... T>
std::ostream& operator<<(std::ostream& os, const std::tuple<T...>& tup)
{
    os << "[";
    print_tuple<0>(os, tup);
    return os << "]";
}

int main()
{
    std::cout << std::make_tuple(2, 3.14159F, 2345.678) << std::endl;
    std::cout << std::make_tuple("hello", 5) << std::endl;
    std::cout << std::make_tuple() << std::endl;
    return 0;
}