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std::endian

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Defined in header <type_traits>
enum class endian

{
    little = /*implementation-defined*/,
    big    = /*implementation-defined*/,
    native = /*implementation-defined*/

};
(1) (since C++20)

Indicates the endianness of all scalar types:

  • If all scalar types are little-endian, std::endian::native equals std::endian::little
  • If all scalar types are big-endian, std::endian::native equals std::endian::big

Corner case platforms are also supported:

  • If all scalar types have sizeof equal to 1, endianness does not matter and all three values, std::endian::little, std::endian::big, and std::endian::native are the same
  • If the platform uses mixed endian, std::endian::native does not equal either std::endian::big nor std::endian::little

[edit] Possible implementation

enum class endian
{
#ifdef _WIN32
    little = 0,
    big    = 1,
    native = little
#else
    little = __ORDER_LITTLE_ENDIAN__,
    big    = __ORDER_BIG_ENDIAN__
    native = __BYTE_ORDER__,
#endif
};

[edit] Example