bool is_other(file_status s) noexcept;
Returns: exists(s) && !is_regular_file(s) && !is_directory(s) && !is_symlink(s).
bool is_other(const path& p);
bool is_other(const path& p, error_code& ec) noexcept;
Returns: is_other(status(p)) or is_other(status(p, ec)), respectively. The signature with argument ec returns false if an error occurs.
Throws: As specified in [fs.err.report].