get two resources with exceptional safety

get_two_resources.cc

template<class T, class D>
auto make_unique_ptr(T* p, D d) noexcept
    -> std::unique_ptr<T, D> {
  return std::unique_ptr<T, D>(p, std::move(d));
}

auto get_two_resources()
    -> std::pair<std::shared_ptr<Res1>, std::shared_ptr<Res2>> {
  Res1* res1_ = {};
  Res2* res2_ = {};

  get_resources(&res1_, &res2_);

  auto res1 = make_unique_ptr(res1_, [](Res1* p){ release(res1); });
  auto res2 = make_unique_ptr(res2_, [](Res2* p){ release(res2); });

  auto pair = std::make_pair(std::move(res1), std::move(res2));

  auto p = std::make_shared<decltype(pair)>(std::move(pair));

  return std::make_pair(
      std::shared_ptr<Res1>(p, p->first.get()),
      std::shared_ptr<Res2>(p, p->second.get()));
}