constexpr basic_vec& operator++() noexcept;
constexpr basic_vec operator++(int) noexcept;
constexpr basic_vec& operator--() noexcept;
constexpr basic_vec operator--(int) noexcept;
constexpr mask_type operator!() const noexcept;
constexpr basic_vec operator~() const noexcept;
constexpr basic_vec operator+() const noexcept;
constexpr basic_vec operator-() const noexcept;