bool filesystem::exists(file_status s) noexcept;

Returns: status_known(s) && s.type() != file_type​::​not_found.

bool filesystem::exists(const path& p); bool filesystem::exists(const path& p, error_code& ec) noexcept;

Let s be a file_status, determined as if by status(p) or status(p, ec), respectively.

Effects: The signature with argument ec calls ec.clear() if status_known(s).