byteswap.hpp

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#ifndef BYTESWAP_HPP_INCLUDED
#define BYTESWAP_HPP_INCLUDED
 
#include <concepts> // std::integral concept
#include <bit> // std::bit_cast
#include <array>
#include <cstddef> // std::byte
#include <algorithm> // std::ranges::reverse
 
namespace chops {
 
template<std::integral T>
constexpr T byteswap(T value) noexcept {
  if constexpr (sizeof(T) == 1u) {
    return value;
  }
  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::ranges::reverse(value_representation);
  return std::bit_cast<T>(value_representation);
}
 
} // end namespace
 
#endif