C++17 Tuple Operator Overloads

gistfile1.txt

// Fold expressions from https://medium.com/@matt.aubury/rip-index-sequence-2014-2017-9cc854aaad0
`
template <typename... Ts, typename... Us>
auto operator+(
    const std::tuple<Ts...> &tuple_t, const std::tuple<Us...> &tuple_u) {
  return std::apply(
      [&](const auto &... ts) {
        return std::apply(
            [&](const auto &... us) { return std::tuple(ts + us...); },
            tuple_u);
      },
      tuple_t);
}

template <typename... Ts, typename... Us>
auto operator+=(std::tuple<Ts...> &tuple_t, const std::tuple<Us...> &tuple_u) {
  return std::apply(
      [&](auto &... ts) {
        return std::apply(
            [&](const auto &... us) { ((ts += us), ...); }, tuple_u);
      },
      tuple_t);
}