From 8cace3f05003c6cb4d38c36890055f03151c2ad4 Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Fri, 16 Oct 2026 02:39:56 +0800
Subject: Remove old code

Signed-off-by: Richard Qin <richard.qin.x@gmail.com>
---
 third_party/libcxx/include/c++/v1/mdspan | 467 -------------------------------
 1 file changed, 467 deletions(-)
 delete mode 100644 third_party/libcxx/include/c++/v1/mdspan

(limited to 'third_party/libcxx/include/c++/v1/mdspan')

diff --git a/third_party/libcxx/include/c++/v1/mdspan b/third_party/libcxx/include/c++/v1/mdspan
deleted file mode 100644
index d46f87c..0000000
--- a/third_party/libcxx/include/c++/v1/mdspan
+++ /dev/null
@@ -1,467 +0,0 @@
-// -*- C++ -*-
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===---------------------------------------------------------------------===//
-
-/*
-
-// Overall mdspan synopsis
-
-namespace std {
-  // [mdspan.extents], class template extents
-  template<class IndexType, size_t... Extents>
-    class extents;
-
-  // [mdspan.extents.dextents], alias template dextents
-  template<class IndexType, size_t Rank>
-    using dextents = see below;
-
-  // [mdspan.extents.dims], alias template dims
-  template<size_t Rank, class IndexType = size_t>
-    using dims = see below; // since C++26
-
-  // [mdspan.layout], layout mapping
-  struct layout_left;
-  struct layout_right;
-  struct layout_stride;
-
-  // [mdspan.accessor.default], class template default_accessor
-  template<class ElementType>
-    class default_accessor;
-
-  // [mdspan.accessor.aligned], class template aligned_accessor
-  template<class ElementType, size_t ByteAlignment>
-    class aligned_accessor; // since C++26
-
-  // [mdspan.mdspan], class template mdspan
-  template<class ElementType, class Extents, class LayoutPolicy = layout_right,
-           class AccessorPolicy = default_accessor<ElementType>>
-    class mdspan;
-}
-
-// extents synopsis
-
-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;
-
-    // [mdspan.extents.obs], observers of the multidimensional index space
-    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;
-
-    // [mdspan.extents.cons], constructors
-    constexpr extents() noexcept = default;
-
-    template<class OtherIndexType, size_t... OtherExtents>
-      constexpr explicit(see below)
-        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;
-
-    // [mdspan.extents.cmp], comparison operators
-    template<class OtherIndexType, size_t... OtherExtents>
-      friend constexpr bool operator==(const extents&,
-                                       const extents<_OtherIndexType, _OtherExtents...>&) noexcept;
-
-  private:
-    // libcxx note: we do not use an array here, but we need to preserve the as-if behavior
-    // for example the default constructor must zero initialize dynamic extents
-    array<index_type, rank_dynamic()> dynamic-extents{};                // exposition only
-  };
-
-  template<class... Integrals>
-    explicit extents(Integrals...)
-      -> see below;
-}
-
-// layout_left synopsis
-
-namespace std {
-  template<class Extents>
-  class layout_left::mapping {
-  public:
-    using extents_type = Extents;
-    using index_type = extents_type::index_type;
-    using size_type = extents_type::size_type;
-    using rank_type = extents_type::rank_type;
-    using layout_type = layout_left;
-
-    // [mdspan.layout.left.cons], constructors
-    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 OtherExtents>
-      constexpr explicit(extents_type::rank() > 0)
-        mapping(const layout_stride::mapping<OtherExtents>&) noexcept;
-
-    constexpr mapping& operator=(const mapping&) noexcept = default;
-
-    // [mdspan.layout.left.obs], observers
-    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_{};    // exposition only
-  };
-}
-
-// layout_right synopsis
-
-namespace std {
-  template<class Extents>
-  class layout_right::mapping {
-  public:
-    using extents_type = Extents;
-    using index_type = extents_type::index_type;
-    using size_type = extents_type::size_type;
-    using rank_type = extents_type::rank_type;
-    using layout_type = layout_right;
-
-    // [mdspan.layout.right.cons], constructors
-    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 OtherExtents>
-      constexpr explicit(extents_type::rank() > 0)
-        mapping(const layout_stride::mapping<OtherExtents>&) noexcept;
-
-    constexpr mapping& operator=(const mapping&) noexcept = default;
-
-    // [mdspan.layout.right.obs], observers
-    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_{};    // exposition only
-  };
-}
-
-// layout_stride synopsis
-
-namespace std {
-  template<class Extents>
-  class layout_stride::mapping {
-  public:
-    using extents_type = Extents;
-    using index_type = extents_type::index_type;
-    using size_type = extents_type::size_type;
-    using rank_type = extents_type::rank_type;
-    using layout_type = layout_stride;
-
-  private:
-    static constexpr rank_type rank_ = extents_type::rank();    // exposition only
-
-  public:
-    // [mdspan.layout.stride.cons], constructors
-    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(see below) mapping(const StridedLayoutMapping&) noexcept;
-
-    constexpr mapping& operator=(const mapping&) noexcept = default;
-
-    // [mdspan.layout.stride.obs], observers
-    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_{};                    // exposition only
-    array<index_type, rank_> strides_{};        // exposition only
-  };
-}
-
-// default_accessor synopsis
-
-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;
-  };
-}
-
-// aligned_accessor synopsis
-
-namespace std {
-  template<class ElementType, size_t ByteAlignment>
-  struct aligned_accessor {
-    using offset_policy = default_accessor<ElementType>;
-    using element_type = ElementType;
-    using reference = ElementType&;
-    using data_handle_type = ElementType*;
-
-    static constexpr size_t byte_alignment = ByteAlignment;
-
-    constexpr aligned_accessor() noexcept = default;
-    template<class OtherElementType, size_t OtherByteAlignment>
-      constexpr aligned_accessor(
-        aligned_accessor<OtherElementType, OtherByteAlignment>) noexcept;
-    template<class OtherElementType>
-      constexpr explicit aligned_accessor(default_accessor<OtherElementType>) noexcept;
-
-    template<class OtherElementType>
-      constexpr operator default_accessor<OtherElementType>() const noexcept;
-
-    constexpr reference access(data_handle_type p, size_t i) const noexcept;
-
-    constexpr typename offset_policy::data_handle_type offset(
-      data_handle_type p, size_t i) const noexcept;
-  };
-}
-
-// mdspan synopsis
-
-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 = layout_type::template mapping<extents_type>;
-    using element_type = ElementType;
-    using value_type = remove_cv_t<element_type>;
-    using index_type = extents_type::index_type;
-    using size_type = extents_type::size_type;
-    using rank_type = extents_type::rank_type;
-    using data_handle_type = accessor_type::data_handle_type;
-    using reference = 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); }
-
-    // [mdspan.mdspan.cons], constructors
-    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(see below)
-        mdspan(const mdspan<OtherElementType, OtherExtents,
-                            OtherLayoutPolicy, OtherAccessorPolicy>& other);
-
-    constexpr mdspan& operator=(const mdspan& rhs) = default;
-    constexpr mdspan& operator=(mdspan&& rhs) = default;
-
-    // [mdspan.mdspan.members], members
-    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() const noexcept { return map_; }
-    constexpr const accessor_type& accessor() const noexcept { return acc_; }
-
-    // per LWG-4021 "mdspan::is_always_meow() should be noexcept"
-    static constexpr bool is_always_unique() noexcept
-      { return mapping_type::is_always_unique(); }
-    static constexpr bool is_always_exhaustive() noexcept
-      { return mapping_type::is_always_exhaustive(); }
-    static constexpr bool is_always_strided() noexcept
-      { return mapping_type::is_always_strided(); }
-
-    constexpr bool is_unique() const
-      { return map_.is_unique(); }
-    constexpr bool is_exhaustive() const
-      { return map_.is_exhaustive(); }
-    constexpr bool is_strided() const
-      { return map_.is_strided(); }
-    constexpr index_type stride(rank_type r) const
-      { return map_.stride(r); }
-
-  private:
-    accessor_type acc_;         // exposition only
-    mapping_type map_;          // exposition only
-    data_handle_type ptr_;      // exposition only
-  };
-
-  template<class CArray>
-    requires (is_array_v<CArray> && rank_v<CArray> == 1)
-    mdspan(CArray&)
-      -> mdspan<remove_all_extents_t<CArray>, extents<size_t, extent_v<CArray, 0>>>;
-
-  template<class Pointer>
-    requires (is_pointer_v<remove_reference_t<Pointer>>)
-    mdspan(Pointer&&)
-      -> mdspan<remove_pointer_t<remove_reference_t<Pointer>>, extents<size_t>>;
-
-  template<class ElementType, class... Integrals>
-    requires ((is_convertible_v<Integrals, size_t> && ...) && sizeof...(Integrals) > 0)
-    explicit mdspan(ElementType*, Integrals...)
-      -> mdspan<ElementType, dextents<size_t, sizeof...(Integrals)>>;            // until C++26
-  template<class ElementType, class... Integrals>
-    requires((is_convertible_v<Integrals, size_t> && ...) && sizeof...(Integrals) > 0)
-    explicit mdspan(ElementType*, Integrals...)
-      -> mdspan<ElementType, extents<size_t, maybe-static-ext<Integrals>...>>;  // since C++26
-
-  template<class ElementType, class OtherIndexType, size_t N>
-    mdspan(ElementType*, span<OtherIndexType, N>)
-      -> mdspan<ElementType, dextents<size_t, N>>;
-
-  template<class ElementType, class OtherIndexType, size_t N>
-    mdspan(ElementType*, const array<OtherIndexType, N>&)
-      -> mdspan<ElementType, dextents<size_t, N>>;
-
-  template<class ElementType, class IndexType, size_t... ExtentsPack>
-    mdspan(ElementType*, const extents<IndexType, ExtentsPack...>&)
-      -> mdspan<ElementType, extents<IndexType, ExtentsPack...>>;
-
-  template<class ElementType, class MappingType>
-    mdspan(ElementType*, const MappingType&)
-      -> mdspan<ElementType, typename MappingType::extents_type,
-                typename MappingType::layout_type>;
-
-  template<class MappingType, class AccessorType>
-    mdspan(typename AccessorType::data_handle_type, const MappingType&,
-           const AccessorType&)
-      -> mdspan<typename AccessorType::element_type, typename MappingType::extents_type,
-                typename MappingType::layout_type, AccessorType>;
-}
-*/
-
-#ifndef _LIBCPP_MDSPAN
-#define _LIBCPP_MDSPAN
-
-#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
-#  include <__cxx03/__config>
-#else
-#  include <__config>
-
-#  if _LIBCPP_STD_VER >= 23
-#    include <__fwd/mdspan.h>
-#    include <__fwd/span.h>
-#    include <__mdspan/default_accessor.h>
-#    include <__mdspan/extents.h>
-#    include <__mdspan/layout_left.h>
-#    include <__mdspan/layout_right.h>
-#    include <__mdspan/layout_stride.h>
-#    include <__mdspan/mdspan.h>
-#  endif
-
-#  include <version>
-
-#  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#    pragma GCC system_header
-#  endif
-#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
-
-#endif // _LIBCPP_MDSPAN
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