Function ForEachTupleMemberImpl

cpp/src/arrow/util/reflection_internal.h:43–46

template <size_t... I, typename... T, typename Fn>
void ForEachTupleMemberImpl(const std::tuple<T...>& tup, Fn&& fn,
                            std::index_sequence<I...>) {
  (..., fn(std::get<I>(tup), I));
}

template <typename... T, typename Fn>
void ForEachTupleMember(const std::tuple<T...>& tup, Fn&& fn) {