gistfile1.cpp

// Define a type which holds an unsigned integer value 
template<std::size_t> struct int_{};

template <class Tuple, size_t Pos>
std::ostream& print_tuple(std::ostream& out, const Tuple& t, int_<Pos> ) {
  out << std::get< std::tuple_size<Tuple>::value-Pos >(t) << ',';
  return print_tuple(out, t, int_<Pos-1>());
}

template <class Tuple>
std::ostream& print_tuple(std::ostream& out, const Tuple& t, int_<1> ) {
  return out << std::get<std::tuple_size<Tuple>::value-1>(t);
}

template <class... Args>
ostream& operator<<(ostream& out, const std::tuple<Args...>& t) {
  out << '('; 
  print_tuple(out, t, int_<sizeof...(Args)>()); 
  return out << ')';
}