Playlist (boost::shared_ptr<const Playlist>, string name, bool hidden = false);
Playlist (boost::shared_ptr<const Playlist>, nframes_t start, nframes_t cnt, string name, bool hidden = false);
Playlist (boost::shared_ptr<const Playlist>, string name, bool hidden = false);
Playlist (boost::shared_ptr<const Playlist>, nframes_t start, nframes_t cnt, string name, bool hidden = false);