std::byte
Defined in header <cstddef> | ||
|---|---|---|
enum class byte : unsigned char {} ;
| (since C++17) |
std::byte is a distinct type that implements the concept of byte as specified in the C++ language definition.
Like char and unsigned char, it can be used to access raw memory occupied by other objects (object representation), but unlike those types, it is not a character type and is not an arithmetic type. A byte is only a collection of bits, and the only operators defined for it are the bitwise ones.
Non-member functions
std::to_integer
template <class IntegerType> constexpr IntegerType to_integer(std::byte b) noexcept; | (since C++17) |
Equivalent to: return IntegerType(b); This overload only participates in overload resolution if std::is_integral_v<IntegerType> is true.
std::operator<<=,operator>>=
template <class IntegerType> constexpr std::byte& operator<<=(std::byte& b, IntegerType shift) noexcept; | (1) | (since C++17) |
template <class IntegerType> constexpr std::byte& operator>>=(std::byte& b, IntegerType shift) noexcept; | (2) | (since C++17) |
return b = b << shift; This overload only participates in overload resolution if std::is_integral_v<IntegerType> is true.return b = b >> shift; This overload only participates in overload resolution if std::is_integral_v<IntegerType> is true.
std::operator<<,operator>>
template <class IntegerType> constexpr std::byte operator <<(std::byte b, IntegerType shift) noexcept; | (1) | (since C++17) |
template <class IntegerType> constexpr std::byte operator >>(std::byte b, IntegerType shift) noexcept; | (2) | (since C++17) |
return std::byte(static_cast<unsigned int>(b) << shift); This overload only participates in overload resolution if std::is_integral_v<IntegerType> is true.return std::byte(static_cast<unsigned int>(b) >> shift); This overload only participates in overload resolution if std::is_integral_v<IntegerType> is true.
std::operator|=,operator&=,operator^=
constexpr std::byte& operator|=(std::byte& l, std::byte r) noexcept; | (1) | (since C++17) |
constexpr std::byte& operator&=(std::byte& l, std::byte r) noexcept; | (2) | (since C++17) |
constexpr std::byte& operator^=(std::byte& l, std::byte r) noexcept; | (3) | (since C++17) |
return l = l | r;.return l = l & r;.return l = l ^ r;. std::operator|,operator&,operator^,operator~
constexpr std::byte operator|(std::byte l, std::byte r) noexcept; | (1) | (since C++17) |
constexpr std::byte operator&(std::byte l, std::byte r) noexcept; | (2) | (since C++17) |
constexpr std::byte operator^(std::byte l, std::byte r) noexcept; | (3) | (since C++17) |
constexpr std::byte operator~(std::byte b) noexcept; | (4) | (since C++17) |
return std::byte(static_cast<unsigned int>(l) | static_cast<unsigned int>(r));.return std::byte(static_cast<unsigned int>(l) & static_cast<unsigned int>(r));.return std::byte(static_cast<unsigned int>(l) ^ static_cast<unsigned int>(r));.return std::byte(~static_cast<unsigned int>(b)); Notes
A numeric value n can be converted to a byte value using std::byte{n}, due to C++17 relaxed enum class initialization rules.
A byte can be converted to a numeric value (such as to produce an integer hash of an object) using std::to_integer.
Example
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