mirror of
https://github.com/capstone-engine/llvm-capstone.git
synced 2024-11-23 13:50:11 +00:00
dbbeee6b83
Implements: https://wg21.link/P2447R6 - https://eel.is/c++draft/span.syn - https://eel.is/c++draft/span.overview - https://eel.is/c++draft/span.cons - https://eel.is/c++draft/diff --------- Co-authored-by: Zingam <zingam@outlook.com>
598 lines
24 KiB
C++
598 lines
24 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===---------------------------------------------------------------------===//
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#ifndef _LIBCPP_SPAN
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#define _LIBCPP_SPAN
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/*
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span synopsis
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namespace std {
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// constants
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inline constexpr size_t dynamic_extent = numeric_limits<size_t>::max();
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// [views.span], class template span
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template <class ElementType, size_t Extent = dynamic_extent>
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class span;
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template<class ElementType, size_t Extent>
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inline constexpr bool ranges::enable_view<span<ElementType, Extent>> = true;
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template<class ElementType, size_t Extent>
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inline constexpr bool ranges::enable_borrowed_range<span<ElementType, Extent>> = true;
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// [span.objectrep], views of object representation
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template <class ElementType, size_t Extent>
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span<const byte, ((Extent == dynamic_extent) ? dynamic_extent :
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(sizeof(ElementType) * Extent))> as_bytes(span<ElementType, Extent> s) noexcept;
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template <class ElementType, size_t Extent>
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span< byte, ((Extent == dynamic_extent) ? dynamic_extent :
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(sizeof(ElementType) * Extent))> as_writable_bytes(span<ElementType, Extent> s) noexcept;
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template <class ElementType, size_t Extent = dynamic_extent>
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class span {
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public:
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// constants and types
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using element_type = ElementType;
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using value_type = remove_cv_t<ElementType>;
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using size_type = size_t;
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using difference_type = ptrdiff_t;
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using pointer = element_type*;
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using const_pointer = const element_type*;
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using reference = element_type&;
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using const_reference = const element_type&;
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using iterator = implementation-defined;
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using reverse_iterator = std::reverse_iterator<iterator>;
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static constexpr size_type extent = Extent;
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// [span.cons], span constructors, copy, assignment, and destructor
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constexpr span() noexcept;
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template <class It>
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constexpr explicit(Extent != dynamic_extent) span(It first, size_type count);
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template <class It, class End>
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constexpr explicit(Extent != dynamic_extent) span(It first, End last);
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template <size_t N>
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constexpr span(type_identity_t<element_type> (&arr)[N]) noexcept;
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template <size_t N>
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constexpr span(array<value_type, N>& arr) noexcept;
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template <size_t N>
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constexpr span(const array<value_type, N>& arr) noexcept;
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template<class R>
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constexpr explicit(Extent != dynamic_extent) span(R&& r);
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constexpr explicit(extent != dynamic_extent) span(std::initializer_list<value_type> il); // Since C++26
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constexpr span(const span& other) noexcept = default;
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template <class OtherElementType, size_t OtherExtent>
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constexpr explicit(Extent != dynamic_extent) span(const span<OtherElementType, OtherExtent>& s) noexcept;
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constexpr span& operator=(const span& other) noexcept = default;
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// [span.sub], span subviews
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template <size_t Count>
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constexpr span<element_type, Count> first() const;
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template <size_t Count>
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constexpr span<element_type, Count> last() const;
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template <size_t Offset, size_t Count = dynamic_extent>
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constexpr span<element_type, see below> subspan() const;
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constexpr span<element_type, dynamic_extent> first(size_type count) const;
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constexpr span<element_type, dynamic_extent> last(size_type count) const;
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constexpr span<element_type, dynamic_extent> subspan(size_type offset, size_type count = dynamic_extent) const;
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// [span.obs], span observers
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constexpr size_type size() const noexcept;
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constexpr size_type size_bytes() const noexcept;
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[[nodiscard]] constexpr bool empty() const noexcept;
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// [span.elem], span element access
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constexpr reference operator[](size_type idx) const;
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constexpr reference at(size_type idx) const; // since C++26
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constexpr reference front() const;
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constexpr reference back() const;
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constexpr pointer data() const noexcept;
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// [span.iterators], span iterator support
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constexpr iterator begin() const noexcept;
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constexpr iterator end() const noexcept;
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constexpr reverse_iterator rbegin() const noexcept;
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constexpr reverse_iterator rend() const noexcept;
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private:
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pointer data_; // exposition only
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size_type size_; // exposition only
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};
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template<class It, class EndOrSize>
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span(It, EndOrSize) -> span<remove_reference_t<iter_reference_t<_It>>>;
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template<class T, size_t N>
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span(T (&)[N]) -> span<T, N>;
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template<class T, size_t N>
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span(array<T, N>&) -> span<T, N>;
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template<class T, size_t N>
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span(const array<T, N>&) -> span<const T, N>;
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template<class R>
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span(R&&) -> span<remove_reference_t<ranges::range_reference_t<R>>>;
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} // namespace std
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*/
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#include <__assert> // all public C++ headers provide the assertion handler
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#include <__config>
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#include <__fwd/span.h>
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#include <__iterator/bounded_iter.h>
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#include <__iterator/concepts.h>
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#include <__iterator/iterator_traits.h>
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#include <__iterator/wrap_iter.h>
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#include <__memory/pointer_traits.h>
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#include <__ranges/concepts.h>
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#include <__ranges/data.h>
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#include <__ranges/enable_borrowed_range.h>
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#include <__ranges/enable_view.h>
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#include <__ranges/size.h>
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#include <__type_traits/is_convertible.h>
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#include <__type_traits/remove_cvref.h>
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#include <__type_traits/remove_reference.h>
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#include <__type_traits/type_identity.h>
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#include <__utility/forward.h>
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#include <array> // for array
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#include <cstddef> // for byte
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#include <stdexcept>
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#include <version>
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// standard-mandated includes
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// [iterator.range]
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#include <__iterator/access.h>
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#include <__iterator/data.h>
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#include <__iterator/empty.h>
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#include <__iterator/reverse_access.h>
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#include <__iterator/size.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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template <class _Tp>
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struct __is_std_array : false_type {};
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template <class _Tp, size_t _Sz>
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struct __is_std_array<array<_Tp, _Sz>> : true_type {};
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template <class _Tp>
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struct __is_std_span : false_type {};
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template <class _Tp, size_t _Sz>
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struct __is_std_span<span<_Tp, _Sz>> : true_type {};
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template <class _Range, class _ElementType>
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concept __span_compatible_range =
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ranges::contiguous_range<_Range> && //
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ranges::sized_range<_Range> && //
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(ranges::borrowed_range<_Range> || is_const_v<_ElementType>)&& //
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!__is_std_span<remove_cvref_t<_Range>>::value && //
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!__is_std_array<remove_cvref_t<_Range>>::value && //
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!is_array_v<remove_cvref_t<_Range>> && //
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is_convertible_v<remove_reference_t<ranges::range_reference_t<_Range>> (*)[], _ElementType (*)[]>;
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template <class _From, class _To>
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concept __span_array_convertible = is_convertible_v<_From (*)[], _To (*)[]>;
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template <class _It, class _Tp>
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concept __span_compatible_iterator =
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contiguous_iterator<_It> && __span_array_convertible<remove_reference_t<iter_reference_t<_It>>, _Tp>;
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template <class _Sentinel, class _It>
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concept __span_compatible_sentinel_for = sized_sentinel_for<_Sentinel, _It> && !is_convertible_v<_Sentinel, size_t>;
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template <typename _Tp, size_t _Extent>
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class _LIBCPP_TEMPLATE_VIS span {
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public:
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// constants and types
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using element_type = _Tp;
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using value_type = remove_cv_t<_Tp>;
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using size_type = size_t;
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using difference_type = ptrdiff_t;
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using pointer = _Tp*;
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using const_pointer = const _Tp*;
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using reference = _Tp&;
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using const_reference = const _Tp&;
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# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS
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using iterator = __bounded_iter<pointer>;
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# else
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using iterator = __wrap_iter<pointer>;
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# endif
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using reverse_iterator = std::reverse_iterator<iterator>;
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static constexpr size_type extent = _Extent;
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// [span.cons], span constructors, copy, assignment, and destructor
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template <size_t _Sz = _Extent>
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requires(_Sz == 0)
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_LIBCPP_HIDE_FROM_ABI constexpr span() noexcept : __data_{nullptr} {}
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# if _LIBCPP_STD_VER >= 26
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_LIBCPP_HIDE_FROM_ABI constexpr explicit span(std::initializer_list<value_type> __il)
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requires is_const_v<element_type>
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: __data_{__il.begin()} {
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_LIBCPP_ASSERT_VALID_INPUT_RANGE(
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_Extent == __il.size(), "Size mismatch in span's constructor _Extent != __il.size().");
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}
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# endif
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constexpr span(const span&) noexcept = default;
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constexpr span& operator=(const span&) noexcept = default;
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template <__span_compatible_iterator<element_type> _It>
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_LIBCPP_HIDE_FROM_ABI constexpr explicit span(_It __first, size_type __count) : __data_{std::to_address(__first)} {
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(void)__count;
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(_Extent == __count, "size mismatch in span's constructor (iterator, len)");
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}
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template <__span_compatible_iterator<element_type> _It, __span_compatible_sentinel_for<_It> _End>
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_LIBCPP_HIDE_FROM_ABI constexpr explicit span(_It __first, _End __last) : __data_{std::to_address(__first)} {
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// [span.cons]/10
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// Throws: When and what last - first throws.
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[[maybe_unused]] auto __dist = __last - __first;
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_LIBCPP_ASSERT_VALID_INPUT_RANGE(__dist >= 0, "invalid range in span's constructor (iterator, sentinel)");
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(
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__dist == _Extent, "invalid range in span's constructor (iterator, sentinel): last - first != extent");
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}
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_LIBCPP_HIDE_FROM_ABI constexpr span(type_identity_t<element_type> (&__arr)[_Extent]) noexcept : __data_{__arr} {}
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template <__span_array_convertible<element_type> _OtherElementType>
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_LIBCPP_HIDE_FROM_ABI constexpr span(array<_OtherElementType, _Extent>& __arr) noexcept : __data_{__arr.data()} {}
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template <class _OtherElementType>
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requires __span_array_convertible<const _OtherElementType, element_type>
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_LIBCPP_HIDE_FROM_ABI constexpr span(const array<_OtherElementType, _Extent>& __arr) noexcept
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: __data_{__arr.data()} {}
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template <__span_compatible_range<element_type> _Range>
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_LIBCPP_HIDE_FROM_ABI constexpr explicit span(_Range&& __r) : __data_{ranges::data(__r)} {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(ranges::size(__r) == _Extent, "size mismatch in span's constructor (range)");
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}
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template <__span_array_convertible<element_type> _OtherElementType>
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_LIBCPP_HIDE_FROM_ABI constexpr span(const span<_OtherElementType, _Extent>& __other) : __data_{__other.data()} {}
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template <__span_array_convertible<element_type> _OtherElementType>
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_LIBCPP_HIDE_FROM_ABI constexpr explicit span(const span<_OtherElementType, dynamic_extent>& __other) noexcept
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: __data_{__other.data()} {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(_Extent == __other.size(), "size mismatch in span's constructor (other span)");
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}
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template <size_t _Count>
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_LIBCPP_HIDE_FROM_ABI constexpr span<element_type, _Count> first() const noexcept {
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static_assert(_Count <= _Extent, "span<T, N>::first<Count>(): Count out of range");
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return span<element_type, _Count>{data(), _Count};
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}
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template <size_t _Count>
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_LIBCPP_HIDE_FROM_ABI constexpr span<element_type, _Count> last() const noexcept {
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static_assert(_Count <= _Extent, "span<T, N>::last<Count>(): Count out of range");
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return span<element_type, _Count>{data() + size() - _Count, _Count};
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}
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_LIBCPP_HIDE_FROM_ABI constexpr span<element_type, dynamic_extent> first(size_type __count) const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__count <= size(), "span<T, N>::first(count): count out of range");
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return {data(), __count};
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}
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_LIBCPP_HIDE_FROM_ABI constexpr span<element_type, dynamic_extent> last(size_type __count) const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__count <= size(), "span<T, N>::last(count): count out of range");
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return {data() + size() - __count, __count};
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}
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template <size_t _Offset, size_t _Count = dynamic_extent>
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_LIBCPP_HIDE_FROM_ABI constexpr auto subspan() const noexcept
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-> span<element_type, _Count != dynamic_extent ? _Count : _Extent - _Offset> {
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static_assert(_Offset <= _Extent, "span<T, N>::subspan<Offset, Count>(): Offset out of range");
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static_assert(_Count == dynamic_extent || _Count <= _Extent - _Offset,
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"span<T, N>::subspan<Offset, Count>(): Offset + Count out of range");
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using _ReturnType = span<element_type, _Count != dynamic_extent ? _Count : _Extent - _Offset>;
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return _ReturnType{data() + _Offset, _Count == dynamic_extent ? size() - _Offset : _Count};
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}
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_LIBCPP_HIDE_FROM_ABI constexpr span<element_type, dynamic_extent>
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subspan(size_type __offset, size_type __count = dynamic_extent) const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__offset <= size(), "span<T, N>::subspan(offset, count): offset out of range");
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if (__count == dynamic_extent)
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return {data() + __offset, size() - __offset};
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(
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__count <= size() - __offset, "span<T, N>::subspan(offset, count): offset + count out of range");
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return {data() + __offset, __count};
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}
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_LIBCPP_HIDE_FROM_ABI constexpr size_type size() const noexcept { return _Extent; }
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_LIBCPP_HIDE_FROM_ABI constexpr size_type size_bytes() const noexcept { return _Extent * sizeof(element_type); }
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool empty() const noexcept { return _Extent == 0; }
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_LIBCPP_HIDE_FROM_ABI constexpr reference operator[](size_type __idx) const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__idx < size(), "span<T, N>::operator[](index): index out of range");
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return __data_[__idx];
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}
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# if _LIBCPP_STD_VER >= 26
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_LIBCPP_HIDE_FROM_ABI constexpr reference at(size_type __index) const {
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if (__index >= size())
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std::__throw_out_of_range("span");
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return __data_[__index];
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}
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# endif
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_LIBCPP_HIDE_FROM_ABI constexpr reference front() const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "span<T, N>::front() on empty span");
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return __data_[0];
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}
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_LIBCPP_HIDE_FROM_ABI constexpr reference back() const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "span<T, N>::back() on empty span");
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return __data_[size() - 1];
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}
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_LIBCPP_HIDE_FROM_ABI constexpr pointer data() const noexcept { return __data_; }
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// [span.iter], span iterator support
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_LIBCPP_HIDE_FROM_ABI constexpr iterator begin() const noexcept {
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# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS
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return std::__make_bounded_iter(data(), data(), data() + size());
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# else
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return iterator(data());
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# endif
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}
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_LIBCPP_HIDE_FROM_ABI constexpr iterator end() const noexcept {
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# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS
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return std::__make_bounded_iter(data() + size(), data(), data() + size());
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# else
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return iterator(data() + size());
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# endif
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}
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_LIBCPP_HIDE_FROM_ABI constexpr reverse_iterator rbegin() const noexcept { return reverse_iterator(end()); }
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_LIBCPP_HIDE_FROM_ABI constexpr reverse_iterator rend() const noexcept { return reverse_iterator(begin()); }
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_LIBCPP_HIDE_FROM_ABI span<const byte, _Extent * sizeof(element_type)> __as_bytes() const noexcept {
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return span<const byte, _Extent * sizeof(element_type)>{reinterpret_cast<const byte*>(data()), size_bytes()};
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}
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_LIBCPP_HIDE_FROM_ABI span<byte, _Extent * sizeof(element_type)> __as_writable_bytes() const noexcept {
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return span<byte, _Extent * sizeof(element_type)>{reinterpret_cast<byte*>(data()), size_bytes()};
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}
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private:
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pointer __data_;
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};
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template <typename _Tp>
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class _LIBCPP_TEMPLATE_VIS span<_Tp, dynamic_extent> {
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public:
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// constants and types
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using element_type = _Tp;
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using value_type = remove_cv_t<_Tp>;
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using size_type = size_t;
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using difference_type = ptrdiff_t;
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using pointer = _Tp*;
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using const_pointer = const _Tp*;
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using reference = _Tp&;
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using const_reference = const _Tp&;
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# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS
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using iterator = __bounded_iter<pointer>;
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# else
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using iterator = __wrap_iter<pointer>;
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# endif
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using reverse_iterator = std::reverse_iterator<iterator>;
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static constexpr size_type extent = dynamic_extent;
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// [span.cons], span constructors, copy, assignment, and destructor
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_LIBCPP_HIDE_FROM_ABI constexpr span() noexcept : __data_{nullptr}, __size_{0} {}
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# if _LIBCPP_STD_VER >= 26
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_LIBCPP_HIDE_FROM_ABI constexpr span(std::initializer_list<value_type> __il)
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requires is_const_v<element_type>
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: __data_{__il.begin()}, __size_{__il.size()} {}
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# endif
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constexpr span(const span&) noexcept = default;
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constexpr span& operator=(const span&) noexcept = default;
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template <__span_compatible_iterator<element_type> _It>
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_LIBCPP_HIDE_FROM_ABI constexpr span(_It __first, size_type __count)
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: __data_{std::to_address(__first)}, __size_{__count} {}
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template <__span_compatible_iterator<element_type> _It, __span_compatible_sentinel_for<_It> _End>
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_LIBCPP_HIDE_FROM_ABI constexpr span(_It __first, _End __last)
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: __data_(std::to_address(__first)), __size_(__last - __first) {
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_LIBCPP_ASSERT_VALID_INPUT_RANGE(__last - __first >= 0, "invalid range in span's constructor (iterator, sentinel)");
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}
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template <size_t _Sz>
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_LIBCPP_HIDE_FROM_ABI constexpr span(type_identity_t<element_type> (&__arr)[_Sz]) noexcept
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: __data_{__arr}, __size_{_Sz} {}
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template <__span_array_convertible<element_type> _OtherElementType, size_t _Sz>
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_LIBCPP_HIDE_FROM_ABI constexpr span(array<_OtherElementType, _Sz>& __arr) noexcept
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: __data_{__arr.data()}, __size_{_Sz} {}
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template <class _OtherElementType, size_t _Sz>
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requires __span_array_convertible<const _OtherElementType, element_type>
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_LIBCPP_HIDE_FROM_ABI constexpr span(const array<_OtherElementType, _Sz>& __arr) noexcept
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: __data_{__arr.data()}, __size_{_Sz} {}
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template <__span_compatible_range<element_type> _Range>
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_LIBCPP_HIDE_FROM_ABI constexpr span(_Range&& __r) : __data_(ranges::data(__r)), __size_{ranges::size(__r)} {}
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template <__span_array_convertible<element_type> _OtherElementType, size_t _OtherExtent>
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_LIBCPP_HIDE_FROM_ABI constexpr span(const span<_OtherElementType, _OtherExtent>& __other) noexcept
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: __data_{__other.data()}, __size_{__other.size()} {}
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template <size_t _Count>
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_LIBCPP_HIDE_FROM_ABI constexpr span<element_type, _Count> first() const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(_Count <= size(), "span<T>::first<Count>(): Count out of range");
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return span<element_type, _Count>{data(), _Count};
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}
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template <size_t _Count>
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_LIBCPP_HIDE_FROM_ABI constexpr span<element_type, _Count> last() const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(_Count <= size(), "span<T>::last<Count>(): Count out of range");
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return span<element_type, _Count>{data() + size() - _Count, _Count};
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}
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_LIBCPP_HIDE_FROM_ABI constexpr span<element_type, dynamic_extent> first(size_type __count) const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__count <= size(), "span<T>::first(count): count out of range");
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return {data(), __count};
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}
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_LIBCPP_HIDE_FROM_ABI constexpr span<element_type, dynamic_extent> last(size_type __count) const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__count <= size(), "span<T>::last(count): count out of range");
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return {data() + size() - __count, __count};
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}
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template <size_t _Offset, size_t _Count = dynamic_extent>
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_LIBCPP_HIDE_FROM_ABI constexpr span<element_type, _Count> subspan() const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(_Offset <= size(), "span<T>::subspan<Offset, Count>(): Offset out of range");
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(_Count == dynamic_extent || _Count <= size() - _Offset,
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"span<T>::subspan<Offset, Count>(): Offset + Count out of range");
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return span<element_type, _Count>{data() + _Offset, _Count == dynamic_extent ? size() - _Offset : _Count};
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}
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constexpr span<element_type, dynamic_extent> _LIBCPP_HIDE_FROM_ABI
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subspan(size_type __offset, size_type __count = dynamic_extent) const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__offset <= size(), "span<T>::subspan(offset, count): offset out of range");
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if (__count == dynamic_extent)
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return {data() + __offset, size() - __offset};
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(
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__count <= size() - __offset, "span<T>::subspan(offset, count): offset + count out of range");
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return {data() + __offset, __count};
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}
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_LIBCPP_HIDE_FROM_ABI constexpr size_type size() const noexcept { return __size_; }
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_LIBCPP_HIDE_FROM_ABI constexpr size_type size_bytes() const noexcept { return __size_ * sizeof(element_type); }
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool empty() const noexcept { return __size_ == 0; }
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_LIBCPP_HIDE_FROM_ABI constexpr reference operator[](size_type __idx) const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__idx < size(), "span<T>::operator[](index): index out of range");
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return __data_[__idx];
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}
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# if _LIBCPP_STD_VER >= 26
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_LIBCPP_HIDE_FROM_ABI constexpr reference at(size_type __index) const {
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if (__index >= size())
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std::__throw_out_of_range("span");
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return __data_[__index];
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}
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# endif
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_LIBCPP_HIDE_FROM_ABI constexpr reference front() const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "span<T>::front() on empty span");
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return __data_[0];
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}
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_LIBCPP_HIDE_FROM_ABI constexpr reference back() const noexcept {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "span<T>::back() on empty span");
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return __data_[size() - 1];
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}
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_LIBCPP_HIDE_FROM_ABI constexpr pointer data() const noexcept { return __data_; }
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// [span.iter], span iterator support
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_LIBCPP_HIDE_FROM_ABI constexpr iterator begin() const noexcept {
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# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS
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return std::__make_bounded_iter(data(), data(), data() + size());
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# else
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return iterator(data());
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# endif
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}
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_LIBCPP_HIDE_FROM_ABI constexpr iterator end() const noexcept {
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# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS
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return std::__make_bounded_iter(data() + size(), data(), data() + size());
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# else
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return iterator(data() + size());
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# endif
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}
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_LIBCPP_HIDE_FROM_ABI constexpr reverse_iterator rbegin() const noexcept { return reverse_iterator(end()); }
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_LIBCPP_HIDE_FROM_ABI constexpr reverse_iterator rend() const noexcept { return reverse_iterator(begin()); }
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_LIBCPP_HIDE_FROM_ABI span<const byte, dynamic_extent> __as_bytes() const noexcept {
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return {reinterpret_cast<const byte*>(data()), size_bytes()};
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}
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_LIBCPP_HIDE_FROM_ABI span<byte, dynamic_extent> __as_writable_bytes() const noexcept {
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return {reinterpret_cast<byte*>(data()), size_bytes()};
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}
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private:
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pointer __data_;
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size_type __size_;
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};
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template <class _Tp, size_t _Extent>
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inline constexpr bool ranges::enable_borrowed_range<span<_Tp, _Extent> > = true;
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template <class _ElementType, size_t _Extent>
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inline constexpr bool ranges::enable_view<span<_ElementType, _Extent>> = true;
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// as_bytes & as_writable_bytes
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template <class _Tp, size_t _Extent>
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_LIBCPP_HIDE_FROM_ABI auto as_bytes(span<_Tp, _Extent> __s) noexcept {
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return __s.__as_bytes();
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}
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template <class _Tp, size_t _Extent>
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requires(!is_const_v<_Tp>)
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_LIBCPP_HIDE_FROM_ABI auto as_writable_bytes(span<_Tp, _Extent> __s) noexcept {
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return __s.__as_writable_bytes();
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}
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# if _LIBCPP_STD_VER >= 20
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template <contiguous_iterator _It, class _EndOrSize>
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span(_It, _EndOrSize) -> span<remove_reference_t<iter_reference_t<_It>>>;
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# endif // _LIBCPP_STD_VER >= 20
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template <class _Tp, size_t _Sz>
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span(_Tp (&)[_Sz]) -> span<_Tp, _Sz>;
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template <class _Tp, size_t _Sz>
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span(array<_Tp, _Sz>&) -> span<_Tp, _Sz>;
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template <class _Tp, size_t _Sz>
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span(const array<_Tp, _Sz>&) -> span<const _Tp, _Sz>;
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template <ranges::contiguous_range _Range>
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span(_Range&&) -> span<remove_reference_t<ranges::range_reference_t<_Range>>>;
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
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# include <concepts>
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# include <functional>
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# include <iterator>
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# include <type_traits>
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#endif
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#endif // _LIBCPP_SPAN
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