ccbysa30.hpp

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/* SPDX-License-Identifier: (Apache-2.0 & CC-BY-SA-3.0) */
 
#ifndef PABIGOT_EXTERNAL_CCBYSA30_HPP
#define PABIGOT_EXTERNAL_CCBYSA30_HPP
#pragma once
 
#include <cinttypes>
#include <climits>
#include <type_traits>
#include <utility>
 
namespace pabigot {
namespace external {
 
namespace ccbysa30 {
 
namespace details {
 
template<class T,
         std::size_t... N>
constexpr T
bswap_impl(T i, std::index_sequence<N...>)
{
  return ((((i >> (N * CHAR_BIT)) & std::uint8_t(-1))
           << ((sizeof(T) - 1 - N) * CHAR_BIT))
          | ...);
}
 
} // ns details
 
template<class T,
         class U = typename std::make_unsigned<T>::type>
constexpr U
bswap(T i)
{
  return details::bswap_impl<U>(i, std::make_index_sequence<sizeof(T)>{});
}
 
} // ns external
} // ns external
} // ns pabigot
 
#endif /* PABIGOT_EXTERNAL_CCBYSA30_HPP */