Program Listing for File byteswap.hpp

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#pragma once

#include <algorithm>
#include <array>
#include <bit>
#include <concepts>

template<std::integral T>
constexpr T byteswap(T value) noexcept {
#ifdef __cpp_lib_byteswap
    return std::byteswap(value);
#else
    static_assert(std::has_unique_object_representations_v<T>, "T may not have padding bits");
    auto value_representation = std::bit_cast<std::array<std::byte, sizeof(T)> >(value);
    std::reverse(value_representation.begin(), value_representation.end());
    return std::bit_cast<T>(value_representation);
#endif
}