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Standard library header <mdspan> (C++23)

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C++
Standard library headers

此头文件属于 容器 库的一部分。

目录

类

(C++23)
多维非拥有数组视图
(类模板)
(C++23)
多维索引空间的描述符
(类模板)
(C++23)
列主序多维数组布局映射策略；最左侧维度步长为 1
(类)
(C++23)
行主序多维数组布局映射策略；最右侧维度步长为 1
(类)
(C++23)
具有用户自定义步长的布局映射策略
(类)
(C++26)
列主序布局映射策略，其填充步长可大于或等于最左侧维度
(类模板)
(C++26)
行主序布局映射策略，其填充步长可大于或等于最右侧维度
(类模板)
(C++23)
用于索引访问 mdspan 元素的类型
(类模板)
(C++26)
表示一组规则间隔索引的切片说明符，由偏移量、范围和步长指示
(类模板)
(C++26)
submdspan_mapping 重载的返回类型
(类模板)

别名模板

(C++23) (C++26)
全动态 std::extents 的便捷别名模板
(别名模板)

函数

(C++26)
从现有范围和切片说明符创建新范围
(函数模板)
<span class="t-lines

概要 

// 所有独立实现
namespace std {
  // 类模板 extents
  template<class IndexType, size_t... Extents>
  class extents;
  // 别名模板 dextents
  template<class IndexType, size_t Rank>
  using dextents = /* 见描述 */;
  // 别名模板 dims
  template<size_t Rank, class IndexType = size_t>
  using dims = /* 见描述 */;
  // 布局映射
  struct layout_left;
  struct layout_right;
  struct layout_stride;
  template<size_t PaddingValue = dynamic_extent>
  struct layout_left_padded;
  template<size_t PaddingValue = dynamic_extent>
  struct layout_right_padded;
  // 类模板 default_accessor
  template<class ElementType>
  class default_accessor;
  // 类模板 mdspan
  template<class ElementType,
           class Extents,
           class LayoutPolicy   = layout_right,
           class AccessorPolicy = default_accessor<ElementType>>
  class mdspan;
  // 子多维切片创建
  template<class OffsetType, class LengthType, class StrideType>
  struct strided_slice;
  template<class LayoutMapping>
  struct submdspan_mapping_result;
  struct full_extent_t
  {
    explicit full_extent_t() = default;
  };
  inline constexpr full_extent_t full_extent{};
  template<class IndexType, class... Extents, class... SliceSpecifiers>
  constexpr auto submdspan_extents(const extents<IndexType, Extents...>&,
                                   SliceSpecifiers...);
  // 子多维切片函数模板
  template<class ElementType,
           class Extents,
           class LayoutPolicy,
           class AccessorPolicy,
           class... SliceSpecifiers>
  constexpr auto submdspan(
    const mdspan<ElementType, Extents, LayoutPolicy, AccessorPolicy>& src,
    SliceSpecifiers... slices) -> /* 见描述 */;
  template<class T, class IndexType>
  concept /*index-pair-like*/ = // 仅用于说明
    /*pair-like*/<T> && convertible_to<tuple_element_t<0, T>, IndexType> &&
    convertible_to<tuple_element_t<1, T>, IndexType>;
}

类模板 std::mdspan 

namespace std {
  template<class ElementType,
           class Extents,
           class LayoutPolicy   = layout_right,
           class AccessorPolicy = default_accessor<ElementType>>
  class mdspan
  {
  public:
    using extents_type     = Extents;
    using layout_type      = LayoutPolicy;
    using accessor_type    = AccessorPolicy;
    using mapping_type     = typename layout_type::template mapping<extents_type>;
    using element_type     = ElementType;
    using value_type       = remove_cv_t<element_type>;
    using index_type       = typename extents_type::index_type;
    using size_type        = typename extents_type::size_type;
    using rank_type        = typename extents_type::rank_type;
    using data_handle_type = typename accessor_type::data_handle_type;
    using reference        = typename accessor_type::reference;
    static constexpr rank_type rank() noexcept { return extents_type::rank(); }
    static constexpr rank_type rank_dynamic() noexcept
    {
      return extents_type::rank_dynamic();
    }
    static constexpr size_t static_extent(rank_type r) noexcept
    {
      return extents_type::static_extent(r);
    }
    constexpr index_type extent(rank_type r) const noexcept
    {
      return extents().extent(r);
    }
    // 构造函数
    constexpr mdspan();
    constexpr mdspan(const mdspan& rhs) = default;
    constexpr mdspan(mdspan&& rhs)      = default;
    template<class... OtherIndexTypes>
    constexpr explicit mdspan(data_handle_type ptr, OtherIndexTypes... exts);
    template<class OtherIndexType, size_t N>
    constexpr explicit(N != rank_dynamic())
      mdspan(data_handle_type p, span<OtherIndexType, N> exts);
    template<class OtherIndexType, size_t N>
    constexpr explicit(N != rank_dynamic())
      mdspan(data_handle_type p, const array<OtherIndexType, N>& exts);
    constexpr mdspan(data_handle_type p, const extents_type& ext);
    constexpr mdspan(data_handle_type p, const mapping_type& m);
    constexpr mdspan(data_handle_type p, const mapping_type& m, const accessor_type& a);
    template<class OtherElementType,
             class OtherExtents,
             class OtherLayoutPolicy,
             class OtherAccessorPolicy>
    constexpr explicit(/* 参见描述 */)
      mdspan(const mdspan<OtherElementType,
                          OtherExtents,
                          OtherLayoutPolicy,
                          OtherAccessorPolicy>& other);
    constexpr mdspan& operator=(const mdspan& rhs) = default;
    constexpr mdspan& operator=(mdspan&& rhs)      = default;
    // 成员函数
    template<class... OtherIndexTypes>
    constexpr reference operator[](OtherIndexTypes... indices) const;
    template<class OtherIndexType>
    constexpr reference operator[](span<OtherIndexType, rank()> indices) const;
    template<class OtherIndexType>
    constexpr reference operator[](const array<OtherIndexType, rank()>& indices) const;
    constexpr size_type size() const noexcept;
    constexpr bool empty() const noexcept;
    friend constexpr void swap(mdspan& x, mdspan& y) noexcept;
    constexpr const extents_type& extents() const noexcept { return /*map_*/.extents(); }
    constexpr const data_handle_type& data_handle() const noexcept { return /*ptr_*/; }
    constexpr const mapping_type& mapping(

类模板 std::extents 

namespace std {
  template<class IndexType, size_t... Extents>
  class extents
  {
  public:
    using index_type = IndexType;
    using size_type  = make_unsigned_t<index_type>;
    using rank_type  = size_t;
    // 多维索引空间的观察器
    static constexpr rank_type rank() noexcept { return sizeof...(Extents); }
    static constexpr rank_type rank_dynamic() noexcept
    {
      return /*dynamic-index*/(rank());
    }
    static constexpr size_t static_extent(rank_type) noexcept;
    constexpr index_type extent(rank_type) const noexcept;
    // 构造函数
    constexpr extents() noexcept = default;
    template<class OtherIndexType, size_t... OtherExtents>
    constexpr explicit(/* see description */)
      extents(const extents<OtherIndexType, OtherExtents...>&) noexcept;
    template<class... OtherIndexTypes>
    constexpr explicit extents(OtherIndexTypes...) noexcept;
    template<class OtherIndexType, size_t N>
    constexpr explicit(N != rank_dynamic()) extents(span<OtherIndexType, N>) noexcept;
    template<class OtherIndexType, size_t N>
    constexpr explicit(N != rank_dynamic())
      extents(const array<OtherIndexType, N>&) noexcept;
    // 比较运算符
    template<class OtherIndexType, size_t... OtherExtents>
    friend constexpr bool operator==(
      const extents&,
      const extents<OtherIndexType, OtherExtents...>&) noexcept;
    // 仅用于说明的辅助函数
    constexpr size_t /*fwd-prod-of-extents*/(rank_type) const noexcept; // 仅用于说明
    constexpr size_t /*rev-prod-of-extents*/(rank_type) const noexcept; // 仅用于说明
    template<class OtherIndexType>
    static constexpr auto /*index-cast*/(OtherIndexType&&) noexcept; // 仅用于说明
  private:
    static constexpr rank_type /*dynamic-index*/(rank_type) noexcept; // 仅用于说明
    static constexpr rank_type /*dynamic-index-inv*/(
      rank_type) noexcept;                                   // 仅用于说明
    array<index_type, rank_dynamic()> /*dynamic-extents*/{}; // 仅用于说明
  };
  template<class... Integrals>
  explicit extents(Integrals...)->/* see description */;
}

布局映射策略 

namespace std {
  struct layout_left
  {
    template<class Extents>
    class mapping;
  };
  struct layout_right
  {
    template<class Extents>
    class mapping;
  };
  struct layout_stride
  {
    template<class Extents>
    class mapping;
  };
  template<size_t PaddingValue>
  struct layout_left_padded
  {
    template<class Extents>
    class mapping;
  };
  template<size_t PaddingValue>
  struct layout_right_padded
  {
    template<class Extents>
    class mapping;
  };
}

类模板 std::layout_left::mapping 

namespace std {
  template<class Extents>
  class layout_left::mapping
  {
  public:
    using extents_type = Extents;
    using index_type   = typename extents_type::index_type;
    using size_type    = typename extents_type::size_type;
    using rank_type    = typename extents_type::rank_type;
    using layout_type  = layout_left;
    // 构造函数
    constexpr mapping() noexcept               = default;
    constexpr mapping(const mapping&) noexcept = default;
    constexpr mapping(const extents_type&) noexcept;
    template<class OtherExtents>
    constexpr explicit(!is_convertible_v<OtherExtents, extents_type>)
      mapping(const mapping<OtherExtents>&) noexcept;
    template<class OtherExtents>
    constexpr explicit(!is_convertible_v<OtherExtents, extents_type>)
      mapping(const layout_right::mapping<OtherExtents>&) noexcept;
    template<class LayoutLeftPaddedMapping>
    constexpr explicit(
      !is_convertible_v<typename LayoutLeftPaddedMapping::extents_type, extents_type>)
      mapping(const LayoutLeftPaddedMapping&) noexcept;
    template<class OtherExtents>
    constexpr explicit(extents_type::rank() > 0)
      mapping(const layout_stride::mapping<OtherExtents>&);
    constexpr mapping& operator=(const mapping&) noexcept = default;
    // 观察器
    constexpr const extents_type& extents() const noexcept { return /*extents_*/; }
    constexpr index_type required_span_size() const noexcept;
    template<class... Indices>
    constexpr index_type operator()(Indices...) const noexcept;
    static constexpr bool is_always_unique() noexcept { return true; }
    static constexpr bool is_always_exhaustive() noexcept { return true; }
    static constexpr bool is_always_strided() noexcept { return true; }
    static constexpr bool is_unique() noexcept { return true; }
    static constexpr bool is_exhaustive() noexcept { return true; }
    static constexpr bool is_strided() noexcept { return true; }
    constexpr index_type stride(rank_type) const noexcept;
    template<class OtherExtents>
    friend constexpr bool operator==(const mapping&,
                                     const mapping<OtherExtents>&) noexcept;
  private:
    extents_type /*extents_*/{}; // 仅用于说明
    // submdspan映射特化
    template<class... SliceSpecifiers>
    constexpr auto /*submdspan-mapping-impl*/(SliceSpecifiers...) const // 仅用于说明
      -> /* 参见描述 */;
    template<class... SliceSpecifiers>
    friend constexpr auto submdspan_mapping(const mapping& src, SliceSpecifiers... slices)
    {
      return src./*submdspan-mapping-impl*/(slices...);
    }
  };
}

类模板 std::layout_right::mapping 

namespace std {
  template<class Extents>
  class layout_right::mapping
  {
  public:
    using extents_type = Extents;
    using index_type   = typename extents_type::index_type;
    using size_type    = typename extents_type::size_type;
    using rank_type    = typename extents_type::rank_type;
    using layout_type  = layout_right;
    // 构造函数
    constexpr mapping() noexcept               = default;
    constexpr mapping(const mapping&) noexcept = default;
    constexpr mapping(const extents_type&) noexcept;
    template<class OtherExtents>
    constexpr explicit(!is_convertible_v<OtherExtents, extents_type>)
      mapping(const mapping<OtherExtents>&) noexcept;
    template<class OtherExtents>
    constexpr explicit(!is_convertible_v<OtherExtents, extents_type>)
      mapping(const layout_left::mapping<OtherExtents>&) noexcept;
    template<class LayoutRightPaddedMapping>
    constexpr explicit(
      !is_convertible_v<typename LayoutRightPaddedMapping::extents_type, extents_type>)
      mapping(const LayoutRightPaddedMapping&) noexcept;
    template<class OtherExtents>
    constexpr explicit(extents_type::rank() > 0)
      mapping(const layout_stride::mapping<OtherExtents>&) noexcept;
    constexpr mapping& operator=(const mapping&) noexcept = default;
    // 观察器
    constexpr const extents_type& extents() const noexcept { return /*extents_*/; }
    constexpr index_type required_span_size() const noexcept;
    template<class... Indices>
    constexpr index_type operator()(Indices...) const noexcept;
    static constexpr bool is_always_unique() noexcept { return true; }
    static constexpr bool is_always_exhaustive() noexcept { return true; }
    static constexpr bool is_always_strided() noexcept { return true; }
    static constexpr bool is_unique() noexcept { return true; }
    static constexpr bool is_exhaustive() noexcept { return true; }
    static constexpr bool is_strided() noexcept { return true; }
    constexpr index_type stride(rank_type) const noexcept;
    template<class OtherExtents>
    friend constexpr bool operator==(const mapping&,
                                     const mapping<OtherExtents>&) noexcept;
  private:
    extents_type /*extents_*/{}; // 仅用于说明
    // submdspan映射特化
    template<class... SliceSpecifiers>
    constexpr auto /*submdspan-mapping-impl*/(SliceSpecifiers...) const // 仅用于说明
      -> /* 参见描述 */;
    template<class... SliceSpecifiers>
    friend constexpr auto submdspan_mapping(const mapping& src, SliceSpecifiers... slices)
    {
      return src./*submdspan-mapping-impl*/(slices...);
    }
  };
}

类模板 std::layout_stride::mapping 

namespace std {
  template<class Extents>
  class layout_stride::mapping
  {
  public:
    using extents_type = Extents;
    using index_type   = typename extents_type::index_type;
    using size_type    = typename extents_type::size_type;
    using rank_type    = typename extents_type::rank_type;
    using layout_type  = layout_stride;
  private:
    static constexpr rank_type /*rank_*/ = extents_type::rank(); // 仅用于说明
  public:
    // 构造函数
    constexpr mapping() noexcept;
    constexpr mapping(const mapping&) noexcept = default;
    template<class OtherIndexType>
    constexpr mapping(const extents_type&, span<OtherIndexType, /*rank_*/>) noexcept;
    template<class OtherIndexType>
    constexpr mapping(const extents_type&,
                      const array<OtherIndexType, /*rank_*/>&) noexcept;
    template<class StridedLayoutMapping>
    constexpr explicit(/* 参见描述 */)
      mapping(const StridedLayoutMapping&) noexcept;
    constexpr mapping& operator=(const mapping&) noexcept = default;
    // 观察器
    constexpr const extents_type& extents() const noexcept { return /*extents_*/; }
    constexpr array<index_type, /*rank_*/> strides() const noexcept
    {
      return /*strides_*/;
    }
    constexpr index_type required_span_size() const noexcept;
    template<class... Indices>
    constexpr index_type operator()(Indices...) const noexcept;
    static constexpr bool is_always_unique() noexcept { return true; }
    static constexpr bool is_always_exhaustive() noexcept { return false; }
    static constexpr bool is_always_strided() noexcept { return true; }
    static constexpr bool is_unique() noexcept { return true; }
    constexpr bool is_exhaustive() const noexcept;
    static constexpr bool is_strided() noexcept { return true; }
    constexpr index_type stride(rank_type i) const noexcept { return /*strides_*/[i]; }
    template<class OtherMapping>
    friend constexpr bool operator==(const mapping&, const OtherMapping&) noexcept;
  private:
    extents_type /*extents_*/{};                 // 仅用于说明
    array<index_type, /*rank_*/> /*strides_*/{}; // 仅用于说明
    // submdspan 映射特化
    template<class... SliceSpecifiers>
    constexpr auto /*submdspan-mapping-impl*/(SliceSpecifiers...) const // 仅用于说明
      -> /* 参见描述 */;
    template<class... SliceSpecifiers>
    friend constexpr auto submdspan_mapping(const mapping& src, SliceSpecifiers... slices)
    {
      return src./*submdspan-mapping-impl*/(slices...);
    }
  };
}

类模板 std::layout_left_padded::mapping 

namespace std {
  template<size_t PaddingValue>
  template<class Extents>
  class layout_left_padded<PaddingValue>::mapping
  {
  public:
    static constexpr size_t padding_value = PaddingValue;
    using extents_type                    = Extents;
    using index_type                      = typename extents_type::index_type;
    using size_type                       = typename extents_type::size_type;
    using rank_type                       = typename extents_type::rank_type;
    using layout_type                     = layout_left_padded<PaddingValue>;
  private:
    static constexpr size_t /*rank_*/ = extents_type::rank(); // 仅用于说明
    static constexpr size_t /*first-static-extent*/ =         // 仅用于说明
      extents_type::static_extent(0);
    // 仅用于说明的成员
    static constexpr size_t /*static-padding-stride*/ =
      /* 参见描述 */; // 仅用于说明
  public:
    // 构造函数
    constexpr mapping() noexcept
      : mapping(extents_type{})
    {
    }
    constexpr mapping(const mapping&) noexcept = default;
    constexpr mapping(const extents_type&);
    template<class OtherIndexType>
    constexpr mapping(const extents_type&, OtherIndexType);
    template<class OtherExtents>
    constexpr explicit(!is_convertible_v<OtherExtents, extents_type>)
      mapping(const layout_left::mapping<OtherExtents>&);
    template<class OtherExtents>
    constexpr explicit(extents_type::rank() > 0)
      mapping(const layout_stride::mapping<OtherExtents>&);
    template<class LayoutLeftPaddedMapping>
    constexpr explicit(/* 参见描述 */) mapping(const LayoutLeftPaddedMapping&);
    template<class LayoutRightPaddedMapping>
    constexpr explicit(/* 参见描述 */)
      mapping(const LayoutRightPaddedMapping&) noexcept;
    constexpr mapping& operator=(const mapping&) noexcept = default;
    // 观察器
    constexpr const extents_type& extents() const noexcept { return /*extents_*/; }
    constexpr array<index_type, rank_> strides() const noexcept;
    constexpr index_type required_span_size() const noexcept;
    template<class... Indices>
    constexpr index_type operator()(Indices...) const noexcept;
    static constexpr bool is_always_unique() noexcept { return true; }
    static constexpr bool is_always_exhaustive() noexcept;
    static constexpr bool is_always_strided() noexcept { return true; }
    static constexpr bool is_unique() noexcept { return true; }
    constexpr bool is_exhaustive() const noexcept;
    static constexpr bool is_strided() noexcept { return true; }
    constexpr index_type stride(rank_type) const noexcept;
    template<class LayoutLeftPaddedMapping>
    friend constexpr bool operator==(const mapping&,
                                     const LayoutLeftPaddedMapping&) noexcept;
  private:
    // 仅用于说明的成员
    index_type /*stride-1*/ = /*static-padding-stride*/; // 仅用于说明
    extents_type /*extents_*/{};                         // 仅用于说明
    // submdspan映射特化
    template<class... SliceSpecifiers>
    constexpr auto /*submdspan-mapping-impl*/(SliceSpecifiers...) const // 仅用于说明
      -> /* 参见描述 */;

类模板 std::layout_right_padded::mapping 

namespace std {
  template<size_t PaddingValue>
  template<class Extents>
  class layout_right_padded<PaddingValue>::mapping
  {
  public:
    static constexpr size_t padding_value = PaddingValue;
    using extents_type                    = Extents;
    using index_type                      = typename extents_type::index_type;
    using size_type                       = typename extents_type::size_type;
    using rank_type                       = typename extents_type::rank_type;
    using layout_type                     = layout_right_padded<PaddingValue>;
  private:
    static constexpr size_t /*rank_*/ = extents_type::rank(); // 仅用于说明
    static constexpr size_t /*last-static-extent*/ =          // 仅用于说明
      extents_type::static_extent(/*rank_*/ - 1);
    // 仅用于说明的成员
    static constexpr size_t /*static-padding-stride*/ =
      /* 见描述 */; // 仅用于说明
  public:
    // 构造函数
    constexpr mapping() noexcept
      : mapping(extents_type{})
    {
    }
    constexpr mapping(const mapping&) noexcept = default;
    constexpr mapping(const extents_type&);
    template<class OtherIndexType>
    constexpr mapping(const extents_type&, OtherIndexType);
    template<class OtherExtents>
    constexpr explicit(!is_convertible_v<OtherExtents, extents_type>)
      mapping(const layout_right::mapping<OtherExtents>&);
    template<class OtherExtents>
    constexpr explicit(rank_ > 0) mapping(const layout_stride::mapping<OtherExtents>&);
    template<class LayoutRightPaddedMapping>
    constexpr explicit(/* 见描述 */) mapping(const LayoutRightPaddedMapping&);
    template<class LayoutLeftPaddedMapping>
    constexpr explicit(/* 见描述 */)
      mapping(const LayoutLeftPaddedMapping&) noexcept;
    constexpr mapping& operator=(const mapping&) noexcept = default;
    // 观察器
    constexpr const extents_type& extents() const noexcept { return extents_; }
    constexpr array<index_type, rank_> strides() const noexcept;
    constexpr index_type required_span_size() const noexcept;
    template<class... Indices>
    constexpr index_type operator()(Indices...) const noexcept;
    static constexpr bool is_always_unique() noexcept { return true; }
    static constexpr bool is_always_exhaustive() noexcept;
    static constexpr bool is_always_strided() noexcept { return true; }
    static constexpr bool is_unique() noexcept { return true; }
    constexpr bool is_exhaustive() const noexcept;
    static constexpr bool is_strided() noexcept { return true; }
    constexpr index_type stride(rank_type) const noexcept;
    template<class LayoutRightPaddedMapping>
    friend constexpr bool operator==(const mapping&,
                                     const LayoutRightPaddedMapping&) noexcept;
  private:
    // 仅用于说明的成员
    index_type /*stride-rm2*/ = /*static-padding-stride*/; // 仅用于说明
    extents_type /*extents_*/{};                           // 仅用于说明
    // submdspan 映射特化
    template<class... SliceSpecifiers>
    constexpr auto /*submdspan-mapping-impl*/(SliceSpecifiers...) const // 仅用于说明
      -> /* 见描述 */;
    template<<

仅用于说明的辅助类型 

template<class T>
constexpr bool /*is-extents*/ = false; // 仅用于说明
template<class IndexType, size_t... Args>
constexpr bool /*is-extents*/<extents<IndexType, Args...>> = true; // 仅用于说明
template<class M>
concept /*layout-mapping-alike*/ = requires { // 仅用于说明
  requires /*is-extents*/<typename M::extents_type>;
  {
    M::is_always_strided()
  } -> same_as<bool>;
  {
    M::is_always_exhaustive()
  } -> same_as<bool>;
  {
    M::is_always_unique()
  } -> same_as<bool>;
  bool_constant<M::is_always_strided()>::value;
  bool_constant<M::is_always_exhaustive()>::value;
  bool_constant<M::is_always_unique()>::value;
};
template<class T>
constexpr T
/*de-ice*/(T val)
{
  return val;
}
template</*integral-constant-like*/ T>
constexpr auto
/*de-ice*/(T)
{
  return T::value;
}
template<class IndexType, size_t k, class... SliceSpecifiers>
constexpr IndexType
/*first_*/(SliceSpecifiers... slices);
template<size_t k, class Extents, class... SliceSpecifiers>
constexpr auto
/*last_*/(const Extents& src, SliceSpecifiers... slices);
template<class IndexType, size_t N, class... SliceSpecifiers>
constexpr array<IndexType, sizeof...(SliceSpecifiers)>
/*src-indices*/(const array<IndexType, N>& indices, SliceSpecifiers... slices);

类模板 std::default_accessor 

namespace std {
  template<class ElementType>
  struct default_accessor
  {
    using offset_policy                   = default_accessor;
    using element_type                    = ElementType;
    using reference                       = ElementType&;
    using data_handle_type                = ElementType*;
    constexpr default_accessor() noexcept = default;
    template<class OtherElementType>
    constexpr default_accessor(default_accessor<OtherElementType>) noexcept;
    constexpr reference access(data_handle_type p, size_t i) const noexcept;
    constexpr data_handle_type offset(data_handle_type p, size_t i) const noexcept;
  };
}

类模板 std::strided_slice 

namespace std {
  template<class OffsetType, class ExtentType, class StrideType>
  struct strided_slice
  {
    using offset_type = OffsetType;
    using extent_type = ExtentType;
    using stride_type = StrideType;
    [[no_unique_address]] offset_type offset{};
    [[no_unique_address]] extent_type extent{};
    [[no_unique_address]] stride_type stride{};
  };
}

类模板 std::submdspan_mapping_result 

namespace std {
  template<class LayoutMapping>
  struct submdspan_mapping_result
  {
    [[no_unique_address]] LayoutMapping mapping = LayoutMapping();
    size_t offset{};
  };
}

参考文献

  • C++23 标准 (ISO/IEC 14882:2024):
  • 24.7.4 头文件 <mdspan> 概要 [mdspan.syn]