Class array

include/magic_enum/magic_enum_containers.hpp:335–448

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template <typename E, typename V, typename Index = default_indexing<E>>
struct array {
  static_assert(std::is_enum_v<E>);
  static_assert(std::is_trivially_constructible_v<Index>);
  static_assert(enum_count<E>() > 0 && Index::at(enum_values<E>().front()));

  using index_type = Index;
  using container_type = std::array<V, enum_count<E>()>;

  using value_type = typename container_type::value_type;
  using size_type = typename container_type::size_type;
  using difference_type = typename container_type::difference_type;
  using reference = typename container_type::reference;
  using const_reference = typename container_type::const_reference;
  using pointer = typename container_type::pointer;
  using const_pointer = typename container_type::const_pointer;
  using iterator = typename container_type::iterator;
  using const_iterator = typename container_type::const_iterator;
  using reverse_iterator = typename container_type::reverse_iterator;
  using const_reverse_iterator = typename container_type::const_reverse_iterator;

  constexpr reference at(E pos) {
    if (auto index = index_type::at(pos)) {
      return a[*index];
    }
    MAGIC_ENUM_THROW(std::out_of_range("magic_enum::containers::array::at Unrecognized position"));
  }

  constexpr const_reference at(E pos) const {
    if (auto index = index_type::at(pos)) {
      return a[*index];
    }
    MAGIC_ENUM_THROW(std::out_of_range("magic_enum::containers::array::at: Unrecognized position"));
  }

  [[nodiscard]] constexpr reference operator[](E pos) {
    auto i = index_type::at(pos);
    return MAGIC_ENUM_ASSERT(i), a[*i];
  }

  [[nodiscard]] constexpr const_reference operator[](E pos) const {
    auto i = index_type::at(pos);
    return MAGIC_ENUM_ASSERT(i), a[*i];
  }

  [[nodiscard]] constexpr reference front() noexcept { return a.front(); }

  [[nodiscard]] constexpr const_reference front() const noexcept { return a.front(); }

  [[nodiscard]] constexpr reference back() noexcept { return a.back(); }

  [[nodiscard]] constexpr const_reference back() const noexcept { return a.back(); }

  [[nodiscard]] constexpr pointer data() noexcept { return a.data(); }

  [[nodiscard]] constexpr const_pointer data() const noexcept { return a.data(); }

  [[nodiscard]] constexpr iterator begin() noexcept { return a.begin(); }