template<class IntType>
constexpr byte& operator<<=(byte& b, IntType shift) noexcept;
template<class IntType>
constexpr byte operator<<(byte b, IntType shift) noexcept;
template<class IntType>
constexpr byte& operator>>=(byte& b, IntType shift) noexcept;
template<class IntType>
constexpr byte operator>>(byte b, IntType shift) noexcept;
constexpr byte& operator|=(byte& l, byte r) noexcept;
constexpr byte operator|(byte l, byte r) noexcept;
constexpr byte& operator&=(byte& l, byte r) noexcept;
constexpr byte operator&(byte l, byte r) noexcept;
constexpr byte& operator^=(byte& l, byte r) noexcept;
constexpr byte operator^(byte l, byte r) noexcept;
constexpr byte operator~(byte b) noexcept;
template<class IntType>
constexpr IntType to_integer(byte b) noexcept;