#include <utility>
#include <iostream>

namespace detail
{
  struct any { template<typename T> any(T &&) {} };

  template<typename T, typename U> struct first { typedef T type; };

  template<typename ...Ts>
		struct select_impl {
			template<typename U, typename ...Vs>
				static U &&select(typename first<any, Ts>::type..., U &&u, Vs &&...) {
					return static_cast<U&&>(u);
				}
		};

	template<std::size_t... Idx, typename... Ts>
		static auto select(const std::index_sequence<Idx...>&, Ts&&... ts)
		{
			return select_impl<decltype(Idx)...>::select(static_cast<Ts&&>(ts)...);
		}
}

template<std::size_t N, typename ...Ts>
auto nth(Ts &&...ts)
{
  return detail::select(std::make_index_sequence<N>(), static_cast<Ts&&>(ts)...);
}

int main()
{
	auto x = ::nth<7>(0,"1",'2',3,"4",'5',6,"7");
	std::cerr << x << std::endl;
}