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Showing content from https://en.cppreference.com/w/cpp/language/../types/endian.html below:

std::endian - cppreference.com

enum class endian { little = /* implementation-defined */, big = /* implementation-defined */, native = /* implementation-defined */, }; (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 equals neither std::endian::big nor std::endian::little.

[edit] Possible implementation

enum class endian
{
#if defined(_MSC_VER) && !defined(__clang__)
    little = 0,
    big    = 1,
    native = little
#else
    little = __ORDER_LITTLE_ENDIAN__,
    big    = __ORDER_BIG_ENDIAN__,
    native = __BYTE_ORDER__
#endif
};

[edit] Notes [edit] Example

#include <bit>
#include <iostream>
 
int main()
{
    if constexpr (std::endian::native == std::endian::big)
        std::cout << "big-endian\n";
    else if constexpr (std::endian::native == std::endian::little)
        std::cout << "little-endian\n";
    else
        std::cout << "mixed-endian\n";
}

Possible output:

[edit] See also

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