You can use `unique_ptr` with a custom deleter for wrapping C libraries.

  using snd_pcm_T = std::unique_ptr<
    snd_pcm_t,
    decltype([](void* ptr){snd_pcm_close(ptr);})
  >;
  auto pcm_handle = snd_pcm_T(snd_pcm_open(...));

The lambda in decltype is C++20, otherwise the deleter type could be declared out-of-line.