Remove libc++ and libc++abi 8.0.0 now that we switched to version 10.0.1

in the gnu/ directory.

1 files changed, 0 insertions, 564 deletions

diff --git a/lib/libcxx/include/span b/lib/libcxx/include/span
deleted file mode 100644
index cebe98760f2..00000000000
--- a/lib/libcxx/include/span
+++ /dev/null
@@ -1,564 +0,0 @@
-// -*- C++ -*-
-//===------------------------------ span ---------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===---------------------------------------------------------------------===//
-
-#ifndef _LIBCPP_SPAN
-#define _LIBCPP_SPAN
-
-/*
-    span synopsis
-
-namespace std {
-
-// constants
-inline constexpr ptrdiff_t dynamic_extent = -1;
-
-// [views.span], class template span
-template <class ElementType, ptrdiff_t Extent = dynamic_extent>
-    class span;
-
-// [span.objectrep], views of object representation
-template <class ElementType, ptrdiff_t Extent>
-    span<const byte, ((Extent == dynamic_extent) ? dynamic_extent :
-        (static_cast<ptrdiff_t>(sizeof(ElementType)) * Extent))> as_bytes(span<ElementType, Extent> s) noexcept;
-
-template <class ElementType, ptrdiff_t Extent>
-    span<      byte, ((Extent == dynamic_extent) ? dynamic_extent :
-        (static_cast<ptrdiff_t>(sizeof(ElementType)) * Extent))> as_writable_bytes(span<ElementType, Extent> s) noexcept;
-
-
-namespace std {
-template <class ElementType, ptrdiff_t Extent = dynamic_extent>
-class span {
-public:
-    // constants and types
-    using element_type = ElementType;
-    using value_type = remove_cv_t<ElementType>;
-    using index_type = ptrdiff_t;
-    using difference_type = ptrdiff_t;
-    using pointer = element_type*;
-    using reference = element_type&;
-    using iterator = implementation-defined;
-    using const_iterator = implementation-defined;
-    using reverse_iterator = std::reverse_iterator<iterator>;
-    using const_reverse_iterator = std::reverse_iterator<const_iterator>;
-    static constexpr index_type extent = Extent;
-
-    // [span.cons], span constructors, copy, assignment, and destructor
-    constexpr span() noexcept;
-    constexpr span(pointer ptr, index_type count);
-    constexpr span(pointer firstElem, pointer lastElem);
-    template <size_t N>
-        constexpr span(element_type (&arr)[N]) noexcept;
-    template <size_t N>
-        constexpr span(array<value_type, N>& arr) noexcept;
-    template <size_t N>
-        constexpr span(const array<value_type, N>& arr) noexcept;
-    template <class Container>
-        constexpr span(Container& cont);
-    template <class Container>
-        constexpr span(const Container& cont);
-    constexpr span(const span& other) noexcept = default;
-    template <class OtherElementType, ptrdiff_t OtherExtent>
-        constexpr span(const span<OtherElementType, OtherExtent>& s) noexcept;
-    ~span() noexcept = default;
-    constexpr span& operator=(const span& other) noexcept = default;
-
-    // [span.sub], span subviews
-    template <ptrdiff_t Count>
-        constexpr span<element_type, Count> first() const;
-    template <ptrdiff_t Count>
-        constexpr span<element_type, Count> last() const;
-    template <ptrdiff_t Offset, ptrdiff_t Count = dynamic_extent>
-        constexpr span<element_type, see below> subspan() const;
-
-    constexpr span<element_type, dynamic_extent> first(index_type count) const;
-    constexpr span<element_type, dynamic_extent> last(index_type count) const;
-    constexpr span<element_type, dynamic_extent> subspan(index_type offset, index_type count = dynamic_extent) const;
-
-    // [span.obs], span observers
-    constexpr index_type size() const noexcept;
-    constexpr index_type size_bytes() const noexcept;
-    constexpr bool empty() const noexcept;
-
-    // [span.elem], span element access
-    constexpr reference operator[](index_type idx) const;
-    constexpr reference operator()(index_type idx) const;
-    constexpr pointer data() const noexcept;
-
-    // [span.iterators], span iterator support
-    constexpr iterator begin() const noexcept;
-    constexpr iterator end() const noexcept;
-    constexpr const_iterator cbegin() const noexcept;
-    constexpr const_iterator cend() const noexcept;
-    constexpr reverse_iterator rbegin() const noexcept;
-    constexpr reverse_iterator rend() const noexcept;
-    constexpr const_reverse_iterator crbegin() const noexcept;
-    constexpr const_reverse_iterator crend() const noexcept;
-
-private:
-    pointer data_;     // exposition only
-    index_type size_;  // exposition only
-};
-
-template<class T, size_t N>
-    span(T (&)[N]) -> span<T, N>;
-
-template<class T, size_t N>
-    span(array<T, N>&) -> span<T, N>;
-
-template<class T, size_t N>
-    span(const array<T, N>&) -> span<const T, N>;
-
-template<class Container>
-    span(Container&) -> span<typename Container::value_type>;
-
-template<class Container>
-    span(const Container&) -> span<const typename Container::value_type>;
-
-} // namespace std
-
-*/
-
-#include <__config>
-#include <cstddef>      // for ptrdiff_t
-#include <iterator>     // for iterators
-#include <array>        // for array
-#include <type_traits>  // for remove_cv, etc
-#include <cstddef>      // for byte
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#pragma GCC system_header
-#endif
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-#if _LIBCPP_STD_VER > 17
-
-inline constexpr ptrdiff_t dynamic_extent = -1;
-template <typename _Tp, ptrdiff_t _Extent = dynamic_extent> class span;
-
-
-template <class _Tp>
-struct __is_span_impl : public false_type {};
-
-template <class _Tp, ptrdiff_t _Extent>
-struct __is_span_impl<span<_Tp, _Extent>> : public true_type {};
-
-template <class _Tp>
-struct __is_span : public __is_span_impl<remove_cv_t<_Tp>> {};
-
-template <class _Tp>
-struct __is_std_array_impl : public false_type {};
-
-template <class _Tp, size_t _Sz>
-struct __is_std_array_impl<array<_Tp, _Sz>> : public true_type {};
-
-template <class _Tp>
-struct __is_std_array : public __is_std_array_impl<remove_cv_t<_Tp>> {};
-
-template <class _Tp, class _ElementType, class = void>
-struct __is_span_compatible_container : public false_type {};
-
-template <class _Tp, class _ElementType>
-struct __is_span_compatible_container<_Tp, _ElementType,
-        void_t<
-        // is not a specialization of span
-            typename enable_if<!__is_span<_Tp>::value, nullptr_t>::type,
-        // is not a specialization of array
-            typename enable_if<!__is_std_array<_Tp>::value, nullptr_t>::type,
-        // is_array_v<Container> is false,
-            typename enable_if<!is_array_v<_Tp>, nullptr_t>::type,
-        // data(cont) and size(cont) are well formed
-            decltype(data(declval<_Tp>())),
-            decltype(size(declval<_Tp>())),
-        // remove_pointer_t<decltype(data(cont))>(*)[] is convertible to ElementType(*)[]
-            typename enable_if<
-                is_convertible_v<remove_pointer_t<decltype(data(declval<_Tp &>()))>(*)[],
-                                 _ElementType(*)[]>,
-                nullptr_t>::type
-        >>
-    : public true_type {};
-
-
-template <typename _Tp, ptrdiff_t _Extent>
-class _LIBCPP_TEMPLATE_VIS span {
-public:
-//  constants and types
-    using element_type           = _Tp;
-    using value_type             = remove_cv_t<_Tp>;
-    using index_type             = ptrdiff_t;
-    using difference_type        = ptrdiff_t;
-    using pointer                = _Tp *;
-    using const_pointer          = const _Tp *; // not in standard
-    using reference              = _Tp &;
-    using const_reference        = const _Tp &; // not in standard
-    using iterator               =  __wrap_iter<pointer>;
-    using const_iterator         =  __wrap_iter<const_pointer>;
-    using reverse_iterator       = _VSTD::reverse_iterator<iterator>;
-    using const_reverse_iterator = _VSTD::reverse_iterator<const_iterator>;
-
-    static constexpr index_type extent = _Extent;
-    static_assert (_Extent >= 0, "Can't have a span with an extent < 0");
-
-// [span.cons], span constructors, copy, assignment, and destructor
-    _LIBCPP_INLINE_VISIBILITY constexpr span() noexcept : __data{nullptr}
-    { static_assert(_Extent == 0, "Can't default construct a statically sized span with size > 0"); }
-
-    constexpr span           (const span&) noexcept = default;
-    constexpr span& operator=(const span&) noexcept = default;
-
-    _LIBCPP_INLINE_VISIBILITY constexpr span(pointer __ptr, index_type __count) : __data{__ptr}
-        { (void)__count; _LIBCPP_ASSERT(_Extent == __count, "size mismatch in span's constructor (ptr, len)"); }
-    _LIBCPP_INLINE_VISIBILITY constexpr span(pointer __f, pointer __l) : __data{__f}
-        { (void)__l;     _LIBCPP_ASSERT(_Extent == distance(__f, __l), "size mismatch in span's constructor (ptr, ptr)"); }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr span(element_type (&__arr)[_Extent])          noexcept : __data{__arr} {}
-    _LIBCPP_INLINE_VISIBILITY constexpr span(      array<value_type, _Extent>& __arr) noexcept : __data{__arr.data()} {}
-    _LIBCPP_INLINE_VISIBILITY constexpr span(const array<value_type, _Extent>& __arr) noexcept : __data{__arr.data()} {}
-
-    template <class _Container>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span(      _Container& __c,
-            enable_if_t<__is_span_compatible_container<_Container, _Tp>::value, nullptr_t> = nullptr)
-        : __data{_VSTD::data(__c)}
-        { _LIBCPP_ASSERT(_Extent == _VSTD::size(__c), "size mismatch in span's constructor (container)"); }
-
-    template <class _Container>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span(const _Container& __c,
-            enable_if_t<__is_span_compatible_container<const _Container, _Tp>::value, nullptr_t> = nullptr)
-        : __data{_VSTD::data(__c)}
-        { _LIBCPP_ASSERT(_Extent == _VSTD::size(__c), "size mismatch in span's constructor (const container)"); }
-
-    template <class _OtherElementType>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span(const span<_OtherElementType, _Extent>& __other,
-                       enable_if_t<
-                          is_convertible_v<_OtherElementType(*)[], element_type (*)[]>,
-                          nullptr_t> = nullptr)
-        : __data{__other.data()} {}
-
-    template <class _OtherElementType>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span(const span<_OtherElementType, dynamic_extent>& __other,
-                       enable_if_t<
-                          is_convertible_v<_OtherElementType(*)[], element_type (*)[]>,
-                          nullptr_t> = nullptr) noexcept
-        : __data{__other.data()} { _LIBCPP_ASSERT(_Extent == __other.size(), "size mismatch in span's constructor (other span)"); }
-
-
-//  ~span() noexcept = default;
-
-    template <ptrdiff_t _Count>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span<element_type, _Count> first() const noexcept
-    {
-        static_assert(_Count >= 0, "Count must be >= 0 in span::first()");
-        static_assert(_Count <= _Extent, "Count out of range in span::first()");
-        return {data(), _Count};
-    }
-
-    template <ptrdiff_t _Count>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span<element_type, _Count> last() const noexcept
-    {
-        static_assert(_Count >= 0, "Count must be >= 0 in span::last()");
-        static_assert(_Count <= _Extent, "Count out of range in span::last()");
-        return {data() + size() - _Count, _Count};
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr span<element_type, dynamic_extent> first(index_type __count) const noexcept
-    {
-        _LIBCPP_ASSERT(__count >= 0 && __count <= size(), "Count out of range in span::first(count)");
-        return {data(), __count};
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr span<element_type, dynamic_extent> last(index_type __count) const noexcept
-    {
-        _LIBCPP_ASSERT(__count >= 0 && __count <= size(), "Count out of range in span::last(count)");
-        return {data() + size() - __count, __count};
-    }
-
-    template <ptrdiff_t _Offset, ptrdiff_t _Count = dynamic_extent>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr auto subspan() const noexcept
-        -> span<element_type, _Count != dynamic_extent ? _Count : _Extent - _Offset>
-    {
-        _LIBCPP_ASSERT(_Offset >= 0 && _Offset <= size(), "Offset out of range in span::subspan()");
-        return {data() + _Offset, _Count == dynamic_extent ? size() - _Offset : _Count};
-    }
-
-
-    inline _LIBCPP_INLINE_VISIBILITY
-    constexpr span<element_type, dynamic_extent>
-       subspan(index_type __offset, index_type __count = dynamic_extent) const noexcept
-    {
-        _LIBCPP_ASSERT( __offset >= 0 && __offset <= size(), "Offset out of range in span::subspan(offset, count)");
-        _LIBCPP_ASSERT((__count  >= 0 && __count  <= size()) || __count == dynamic_extent, "Count out of range in span::subspan(offset, count)");
-        if (__count == dynamic_extent)
-            return {data() + __offset, size() - __offset};
-        _LIBCPP_ASSERT(__offset + __count <= size(), "count + offset out of range in span::subspan(offset, count)");
-        return {data() + __offset, __count};
-    }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr index_type size()       const noexcept { return _Extent; }
-    _LIBCPP_INLINE_VISIBILITY constexpr index_type size_bytes() const noexcept { return _Extent * sizeof(element_type); }
-    _LIBCPP_INLINE_VISIBILITY constexpr bool empty()            const noexcept { return _Extent == 0; }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr reference operator[](index_type __idx) const noexcept
-    {
-        _LIBCPP_ASSERT(__idx >= 0 && __idx < size(), "span<T,N>[] index out of bounds");
-        return __data[__idx];
-    }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr reference operator()(index_type __idx) const noexcept
-    {
-        _LIBCPP_ASSERT(__idx >= 0 && __idx < size(), "span<T,N>() index out of bounds");
-        return __data[__idx];
-    }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr pointer data()                         const noexcept { return __data; }
-
-// [span.iter], span iterator support
-    _LIBCPP_INLINE_VISIBILITY constexpr iterator                 begin() const noexcept { return iterator(data()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr iterator                   end() const noexcept { return iterator(data() + size()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_iterator          cbegin() const noexcept { return const_iterator(data()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_iterator            cend() const noexcept { return const_iterator(data() + size()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr reverse_iterator        rbegin() const noexcept { return reverse_iterator(end()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr reverse_iterator          rend() const noexcept { return reverse_iterator(begin()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(cend()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_reverse_iterator   crend() const noexcept { return const_reverse_iterator(cbegin()); }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr void swap(span &__other) noexcept
-    {
-        pointer __p = __data;
-        __data = __other.__data;
-        __other.__data = __p;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY span<const byte, _Extent * sizeof(element_type)> __as_bytes() const noexcept
-    { return {reinterpret_cast<const byte *>(data()), size_bytes()}; }
-
-    _LIBCPP_INLINE_VISIBILITY span<byte, _Extent * sizeof(element_type)> __as_writeable_bytes() const noexcept
-    { return {reinterpret_cast<byte *>(data()), size_bytes()}; }
-
-private:
-    pointer    __data;
-
-};
-
-
-template <typename _Tp>
-class _LIBCPP_TEMPLATE_VIS span<_Tp, dynamic_extent> {
-private:
-
-public:
-//  constants and types
-    using element_type           = _Tp;
-    using value_type             = remove_cv_t<_Tp>;
-    using index_type             = ptrdiff_t;
-    using difference_type        = ptrdiff_t;
-    using pointer                = _Tp *;
-    using const_pointer          = const _Tp *; // not in standard
-    using reference              = _Tp &;
-    using const_reference        = const _Tp &; // not in standard
-    using iterator               =  __wrap_iter<pointer>;
-    using const_iterator         =  __wrap_iter<const_pointer>;
-    using reverse_iterator       = _VSTD::reverse_iterator<iterator>;
-    using const_reverse_iterator = _VSTD::reverse_iterator<const_iterator>;
-
-    static constexpr index_type extent = dynamic_extent;
-
-// [span.cons], span constructors, copy, assignment, and destructor
-    _LIBCPP_INLINE_VISIBILITY constexpr span() noexcept : __data{nullptr}, __size{0} {}
-
-    constexpr span           (const span&) noexcept = default;
-    constexpr span& operator=(const span&) noexcept = default;
-
-    _LIBCPP_INLINE_VISIBILITY constexpr span(pointer __ptr, index_type __count) : __data{__ptr}, __size{__count} {}
-    _LIBCPP_INLINE_VISIBILITY constexpr span(pointer __f, pointer __l) : __data{__f}, __size{distance(__f, __l)} {}
-
-    template <size_t _Sz>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span(element_type (&__arr)[_Sz]) noexcept : __data{__arr}, __size{_Sz} {}
-
-    template <size_t _Sz>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span(array<value_type, _Sz>& __arr)       noexcept : __data{__arr.data()}, __size{_Sz} {}
-
-    template <size_t _Sz>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span(const array<value_type, _Sz>& __arr) noexcept : __data{__arr.data()}, __size{_Sz} {}
-
-    template <class _Container>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span(      _Container& __c,
-            enable_if_t<__is_span_compatible_container<_Container, _Tp>::value, nullptr_t> = nullptr)
-        : __data{_VSTD::data(__c)}, __size{(index_type) _VSTD::size(__c)} {}
-
-    template <class _Container>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span(const _Container& __c,
-            enable_if_t<__is_span_compatible_container<const _Container, _Tp>::value, nullptr_t> = nullptr)
-        : __data{_VSTD::data(__c)}, __size{(index_type) _VSTD::size(__c)} {}
-
-
-    template <class _OtherElementType, ptrdiff_t _OtherExtent>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span(const span<_OtherElementType, _OtherExtent>& __other,
-                       enable_if_t<
-                          is_convertible_v<_OtherElementType(*)[], element_type (*)[]>,
-                          nullptr_t> = nullptr) noexcept
-        : __data{__other.data()}, __size{__other.size()} {}
-
-//    ~span() noexcept = default;
-
-    template <ptrdiff_t _Count>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span<element_type, _Count> first() const noexcept
-    {
-        static_assert(_Count >= 0, "Count must be >= 0 in span::first()");
-        _LIBCPP_ASSERT(_Count <= size(), "Count out of range in span::first()");
-        return {data(), _Count};
-    }
-
-    template <ptrdiff_t _Count>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span<element_type, _Count> last() const noexcept
-    {
-        static_assert(_Count >= 0, "Count must be >= 0 in span::last()");
-        _LIBCPP_ASSERT(_Count <= size(), "Count out of range in span::last()");
-        return {data() + size() - _Count, _Count};
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr span<element_type, dynamic_extent> first(index_type __count) const noexcept
-    {
-        _LIBCPP_ASSERT(__count >= 0 && __count <= size(), "Count out of range in span::first(count)");
-        return {data(), __count};
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr span<element_type, dynamic_extent> last (index_type __count) const noexcept
-    {
-        _LIBCPP_ASSERT(__count >= 0 && __count <= size(), "Count out of range in span::last(count)");
-        return {data() + size() - __count, __count};
-    }
-
-    template <ptrdiff_t _Offset, ptrdiff_t _Count = dynamic_extent>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span<_Tp, dynamic_extent> subspan() const noexcept
-    {
-        _LIBCPP_ASSERT(_Offset >= 0 && _Offset <= size(), "Offset out of range in span::subspan()");
-        _LIBCPP_ASSERT(_Count == dynamic_extent || _Offset + _Count <= size(), "Count out of range in span::subspan()");
-        return {data() + _Offset, _Count == dynamic_extent ? size() - _Offset : _Count};
-    }
-
-    constexpr span<element_type, dynamic_extent>
-    inline _LIBCPP_INLINE_VISIBILITY
-       subspan(index_type __offset, index_type __count = dynamic_extent) const noexcept
-    {
-        _LIBCPP_ASSERT( __offset >= 0 && __offset <= size(), "Offset out of range in span::subspan(offset, count)");
-        _LIBCPP_ASSERT((__count  >= 0 && __count  <= size()) || __count == dynamic_extent, "count out of range in span::subspan(offset, count)");
-        if (__count == dynamic_extent)
-            return {data() + __offset, size() - __offset};
-        _LIBCPP_ASSERT(__offset + __count <= size(), "Offset + count out of range in span::subspan(offset, count)");
-        return {data() + __offset, __count};
-    }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr index_type size()       const noexcept { return __size; }
-    _LIBCPP_INLINE_VISIBILITY constexpr index_type size_bytes() const noexcept { return __size * sizeof(element_type); }
-    _LIBCPP_INLINE_VISIBILITY constexpr bool empty()            const noexcept { return __size == 0; }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr reference operator[](index_type __idx) const noexcept
-    {
-        _LIBCPP_ASSERT(__idx >= 0 && __idx < size(), "span<T>[] index out of bounds");
-        return __data[__idx];
-    }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr reference operator()(index_type __idx) const noexcept
-    {
-        _LIBCPP_ASSERT(__idx >= 0 && __idx < size(), "span<T>() index out of bounds");
-        return __data[__idx];
-    }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr pointer data()                         const noexcept { return __data; }
-
-// [span.iter], span iterator support
-    _LIBCPP_INLINE_VISIBILITY constexpr iterator                 begin() const noexcept { return iterator(data()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr iterator                   end() const noexcept { return iterator(data() + size()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_iterator          cbegin() const noexcept { return const_iterator(data()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_iterator            cend() const noexcept { return const_iterator(data() + size()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr reverse_iterator        rbegin() const noexcept { return reverse_iterator(end()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr reverse_iterator          rend() const noexcept { return reverse_iterator(begin()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(cend()); }
-    _LIBCPP_INLINE_VISIBILITY constexpr const_reverse_iterator   crend() const noexcept { return const_reverse_iterator(cbegin()); }
-
-    _LIBCPP_INLINE_VISIBILITY constexpr void swap(span &__other) noexcept
-    {
-        pointer __p = __data;
-        __data = __other.__data;
-        __other.__data = __p;
-
-        index_type __sz = __size;
-        __size = __other.__size;
-        __other.__size = __sz;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY span<const byte, dynamic_extent> __as_bytes() const noexcept
-    { return {reinterpret_cast<const byte *>(data()), size_bytes()}; }
-
-    _LIBCPP_INLINE_VISIBILITY span<byte, dynamic_extent> __as_writeable_bytes() const noexcept
-    { return {reinterpret_cast<byte *>(data()), size_bytes()}; }
-
-private:
-    pointer    __data;
-    index_type __size;
-};
-
-//  as_bytes & as_writeable_bytes
-template <class _Tp, ptrdiff_t _Extent>
-    auto as_bytes(span<_Tp, _Extent> __s) noexcept
-    -> decltype(__s.__as_bytes())
-    { return __s.__as_bytes(); }
-
-template <class _Tp, ptrdiff_t _Extent>
-    auto as_writeable_bytes(span<_Tp, _Extent> __s) noexcept
-    -> typename enable_if<!is_const_v<_Tp>, decltype(__s.__as_writeable_bytes())>::type
-    { return __s.__as_writeable_bytes(); }
-
-template <class _Tp, ptrdiff_t _Extent>
-    constexpr void swap(span<_Tp, _Extent> &__lhs, span<_Tp, _Extent> &__rhs) noexcept
-    { __lhs.swap(__rhs); }
-
-
-//  Deduction guides
-template<class _Tp, size_t _Sz>
-    span(_Tp (&)[_Sz]) -> span<_Tp, _Sz>;
-
-template<class _Tp, size_t _Sz>
-    span(array<_Tp, _Sz>&) -> span<_Tp, _Sz>;
-
-template<class _Tp, size_t _Sz>
-    span(const array<_Tp, _Sz>&) -> span<const _Tp, _Sz>;
-
-template<class _Container>
-    span(_Container&) -> span<typename _Container::value_type>;
-
-template<class _Container>
-    span(const _Container&) -> span<const typename _Container::value_type>;
-
-#endif // _LIBCPP_STD_VER > 17
-
-_LIBCPP_END_NAMESPACE_STD
-
-#endif // _LIBCPP_SPAN