std::forward_as_tuple

template<class... Types>
  tuple<Types&&...> forward_as_tuple (Types&&... args) noexcept
{
  return tuple<Types&&...>(std::forward<Types>(args)...);
}

// forward_as_tuple example
#include <iostream>     // std::cout
#include <tuple>        // std::tuple, std::get, std::forward_as_tuple
#include <string>       // std::string

void print_pack (std::tuple<std::string&&,int&&> pack) {
  std::cout << std::get<0>(pack) << ", " << std::get<1>(pack) << '\n';
}

int main() {
  std::string str ("John");
  print_pack (std::forward_as_tuple(str+" Smith",25));
  print_pack (std::forward_as_tuple(str+" Daniels",22));
  return 0;
}