power_of_two_value_block.h

#pragma once
 
#include <pixie/permutations/detail/packed_value_block.h>
 
#include <bit>
#include <climits>
#include <cstddef>
#include <cstdint>
#include <limits>
 
namespace pixie::experimental {

template <class T = std::uint64_t, std::size_t Values = 256>
class PowerOfTwoValueBlock
    : public permutations::detail::PackedValueBlock<
          T,
          sizeof(permutations::detail::BitBlock<
                 Values * std::numeric_limits<T>::digits>) *
              CHAR_BIT,
          std::numeric_limits<T>::digits,
          permutations::detail::BitBlock<Values *
                                         std::numeric_limits<T>::digits>> {
  static_assert(std::has_single_bit(Values));
  using Base = permutations::detail::PackedValueBlock<
      T,
      sizeof(permutations::detail::BitBlock<Values *
                                            std::numeric_limits<T>::digits>) *
          CHAR_BIT,
      std::numeric_limits<T>::digits,
      permutations::detail::BitBlock<Values * std::numeric_limits<T>::digits>>;
 
 public:
  using Base::Base;
  PowerOfTwoValueBlock() noexcept {}
};
 
}  // namespace pixie::experimental