mirror of
https://github.com/jart/cosmopolitan.git
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Upgrade to 2022-era LLVM LIBCXX
This commit is contained in:
Justine Tunney
parent
2f4ca71f26
commit
8e68384e15
2078 changed files with 165657 additions and 65010 deletions
538
third_party/libcxx/span
vendored
538
third_party/libcxx/span
vendored
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@ -1,5 +1,5 @@
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// -*- C++ -*-
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//===------------------------------ span ---------------------------------===//
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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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@ -22,6 +22,12 @@ inline constexpr size_t dynamic_extent = numeric_limits<size_t>::max();
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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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@ -32,42 +38,39 @@ template <class ElementType, size_t Extent>
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(sizeof(ElementType) * Extent))> as_writable_bytes(span<ElementType, Extent> s) noexcept;
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namespace std {
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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 index_type = size_t;
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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 const_iterator = implementation-defined;
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using reverse_iterator = std::reverse_iterator<iterator>;
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using const_reverse_iterator = std::reverse_iterator<const_iterator>;
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static constexpr index_type extent = Extent;
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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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constexpr span(pointer ptr, index_type count);
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constexpr span(pointer firstElem, pointer lastElem);
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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(element_type (&arr)[N]) noexcept;
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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 Container>
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constexpr span(Container& cont);
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template <class Container>
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constexpr span(const Container& cont);
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template<class R>
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constexpr explicit(Extent != dynamic_extent) span(R&& r);
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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 span(const span<OtherElementType, OtherExtent>& s) noexcept;
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constexpr explicit(Extent != dynamic_extent) span(const span<OtherElementType, OtherExtent>& s) noexcept;
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~span() noexcept = default;
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constexpr span& operator=(const span& other) noexcept = default;
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@ -79,17 +82,17 @@ public:
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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(index_type count) const;
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constexpr span<element_type, dynamic_extent> last(index_type count) const;
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constexpr span<element_type, dynamic_extent> subspan(index_type offset, index_type count = dynamic_extent) 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 index_type size() const noexcept;
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constexpr index_type size_bytes() const noexcept;
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constexpr bool empty() const noexcept;
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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[](index_type idx) const;
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constexpr reference operator[](size_type idx) const;
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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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@ -97,18 +100,17 @@ public:
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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 const_iterator cbegin() const noexcept;
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constexpr const_iterator cend() 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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constexpr const_reverse_iterator crbegin() const noexcept;
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constexpr const_reverse_iterator crend() const noexcept;
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private:
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pointer data_; // exposition only
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index_type size_; // exposition only
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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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@ -118,75 +120,87 @@ template<class T, size_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 Container>
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span(Container&) -> span<typename Container::value_type>;
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template<class Container>
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span(const Container&) -> span<const typename Container::value_type>;
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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 "third_party/libcxx/__config"
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#include "third_party/libcxx/iterator" // for iterators
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#include "third_party/libcxx/array" // for array
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#include "third_party/libcxx/type_traits" // for remove_cv, etc
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#include "third_party/libcxx/cstddef" // for byte
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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 <__debug>
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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 <limits>
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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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# 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 > 17
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inline constexpr size_t dynamic_extent = numeric_limits<size_t>::max();
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template <typename _Tp, size_t _Extent = dynamic_extent> class span;
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#if _LIBCPP_STD_VER >= 20
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template <class _Tp>
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struct __is_span_impl : public false_type {};
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template <class _Tp, size_t _Extent>
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struct __is_span_impl<span<_Tp, _Extent>> : public true_type {};
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template <class _Tp>
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struct __is_span : public __is_span_impl<remove_cv_t<_Tp>> {};
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template <class _Tp>
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struct __is_std_array_impl : public false_type {};
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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_impl<array<_Tp, _Sz>> : public true_type {};
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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_array : public __is_std_array_impl<remove_cv_t<_Tp>> {};
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struct __is_std_span : false_type {};
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template <class _Tp, class _ElementType, class = void>
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struct __is_span_compatible_container : public 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 _Tp, class _ElementType>
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struct __is_span_compatible_container<_Tp, _ElementType,
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void_t<
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// is not a specialization of span
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typename enable_if<!__is_span<_Tp>::value, nullptr_t>::type,
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// is not a specialization of array
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typename enable_if<!__is_std_array<_Tp>::value, nullptr_t>::type,
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// is_array_v<Container> is false,
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typename enable_if<!is_array_v<_Tp>, nullptr_t>::type,
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// data(cont) and size(cont) are well formed
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decltype(data(declval<_Tp>())),
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decltype(size(declval<_Tp>())),
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// remove_pointer_t<decltype(data(cont))>(*)[] is convertible to ElementType(*)[]
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typename enable_if<
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is_convertible_v<remove_pointer_t<decltype(data(declval<_Tp &>()))>(*)[],
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_ElementType(*)[]>,
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nullptr_t>::type
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>>
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: public 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 = 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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@ -194,50 +208,73 @@ 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 index_type = size_t;
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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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using iterator = __wrap_iter<pointer>;
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using const_iterator = __wrap_iter<const_pointer>;
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#ifdef _LIBCPP_DEBUG_ITERATOR_BOUNDS_CHECKING
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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 = _VSTD::reverse_iterator<iterator>;
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using const_reverse_iterator = _VSTD::reverse_iterator<const_iterator>;
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static constexpr index_type extent = _Extent;
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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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_LIBCPP_INLINE_VISIBILITY constexpr span() noexcept : __data{nullptr}
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{ static_assert(_Extent == 0, "Can't default construct a statically sized span with size > 0"); }
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template <size_t _Sz = _Extent> requires(_Sz == 0)
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_LIBCPP_INLINE_VISIBILITY constexpr span() noexcept : __data_{nullptr} {}
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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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_LIBCPP_INLINE_VISIBILITY constexpr span(pointer __ptr, index_type __count) : __data{__ptr}
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{ (void)__count; _LIBCPP_ASSERT(_Extent == __count, "size mismatch in span's constructor (ptr, len)"); }
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_LIBCPP_INLINE_VISIBILITY constexpr span(pointer __f, pointer __l) : __data{__f}
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{ (void)__l; _LIBCPP_ASSERT(_Extent == distance(__f, __l), "size mismatch in span's constructor (ptr, ptr)"); }
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template <__span_compatible_iterator<element_type> _It>
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_LIBCPP_INLINE_VISIBILITY
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constexpr explicit span(_It __first, size_type __count)
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: __data_{_VSTD::to_address(__first)} {
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(void)__count;
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_LIBCPP_ASSERT(_Extent == __count, "size mismatch in span's constructor (iterator, len)");
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}
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_LIBCPP_INLINE_VISIBILITY constexpr span(element_type (&__arr)[_Extent]) noexcept : __data{__arr} {}
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_LIBCPP_INLINE_VISIBILITY constexpr span( array<value_type, _Extent>& __arr) noexcept : __data{__arr.data()} {}
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_LIBCPP_INLINE_VISIBILITY constexpr span(const array<value_type, _Extent>& __arr) noexcept : __data{__arr.data()} {}
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template <__span_compatible_iterator<element_type> _It, __span_compatible_sentinel_for<_It> _End>
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_LIBCPP_INLINE_VISIBILITY
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constexpr explicit span(_It __first, _End __last) : __data_{_VSTD::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(__dist >= 0, "invalid range in span's constructor (iterator, sentinel)");
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_LIBCPP_ASSERT(
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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_INLINE_VISIBILITY 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_INLINE_VISIBILITY
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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_INLINE_VISIBILITY
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constexpr span(const span<_OtherElementType, _Extent>& __other,
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enable_if_t<
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is_convertible_v<_OtherElementType(*)[], element_type (*)[]>,
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nullptr_t> = nullptr)
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: __data{__other.data()} {}
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constexpr span(const array<_OtherElementType, _Extent>& __arr) noexcept : __data_{__arr.data()} {}
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template <class _OtherElementType>
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template <__span_compatible_range<element_type> _Range>
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_LIBCPP_INLINE_VISIBILITY
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constexpr span(const span<_OtherElementType, dynamic_extent>& __other,
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enable_if_t<
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is_convertible_v<_OtherElementType(*)[], element_type (*)[]>,
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nullptr_t> = nullptr) noexcept
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: __data{__other.data()} { _LIBCPP_ASSERT(_Extent == __other.size(), "size mismatch in span's constructor (other span)"); }
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constexpr explicit span(_Range&& __r) : __data_{ranges::data(__r)} {
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_LIBCPP_ASSERT(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_INLINE_VISIBILITY
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constexpr span(const span<_OtherElementType, _Extent>& __other)
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: __data_{__other.data()} {}
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template <__span_array_convertible<element_type> _OtherElementType>
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_LIBCPP_INLINE_VISIBILITY
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constexpr explicit span(const span<_OtherElementType, dynamic_extent>& __other) noexcept
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: __data_{__other.data()} { _LIBCPP_ASSERT(_Extent == __other.size(), "size mismatch in span's constructor (other span)"); }
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// ~span() noexcept = default;
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@ -246,29 +283,29 @@ public:
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_LIBCPP_INLINE_VISIBILITY
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constexpr span<element_type, _Count> first() const noexcept
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{
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static_assert(_Count <= _Extent, "Count out of range in span::first()");
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return {data(), _Count};
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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_INLINE_VISIBILITY
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constexpr span<element_type, _Count> last() const noexcept
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{
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static_assert(_Count <= _Extent, "Count out of range in span::last()");
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return {data() + size() - _Count, _Count};
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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_INLINE_VISIBILITY
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constexpr span<element_type, dynamic_extent> first(index_type __count) const noexcept
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constexpr span<element_type, dynamic_extent> first(size_type __count) const noexcept
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{
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_LIBCPP_ASSERT(__count <= size(), "Count out of range in span::first(count)");
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_LIBCPP_ASSERT(__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_INLINE_VISIBILITY
|
||||
constexpr span<element_type, dynamic_extent> last(index_type __count) const noexcept
|
||||
constexpr span<element_type, dynamic_extent> last(size_type __count) const noexcept
|
||||
{
|
||||
_LIBCPP_ASSERT(__count <= size(), "Count out of range in span::last(count)");
|
||||
_LIBCPP_ASSERT(__count <= size(), "span<T, N>::last(count): count out of range");
|
||||
return {data() + size() - __count, __count};
|
||||
}
|
||||
|
||||
|
|
@ -277,138 +314,137 @@ public:
|
|||
constexpr auto subspan() const noexcept
|
||||
-> span<element_type, _Count != dynamic_extent ? _Count : _Extent - _Offset>
|
||||
{
|
||||
static_assert(_Offset <= _Extent, "Offset out of range in span::subspan()");
|
||||
return {data() + _Offset, _Count == dynamic_extent ? size() - _Offset : _Count};
|
||||
static_assert(_Offset <= _Extent, "span<T, N>::subspan<Offset, Count>(): Offset out of range");
|
||||
static_assert(_Count == dynamic_extent || _Count <= _Extent - _Offset, "span<T, N>::subspan<Offset, Count>(): Offset + Count out of range");
|
||||
|
||||
using _ReturnType = span<element_type, _Count != dynamic_extent ? _Count : _Extent - _Offset>;
|
||||
return _ReturnType{data() + _Offset, _Count == dynamic_extent ? size() - _Offset : _Count};
|
||||
}
|
||||
|
||||
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
constexpr span<element_type, dynamic_extent>
|
||||
subspan(index_type __offset, index_type __count = dynamic_extent) const noexcept
|
||||
subspan(size_type __offset, size_type __count = dynamic_extent) const noexcept
|
||||
{
|
||||
_LIBCPP_ASSERT(__offset <= size(), "Offset out of range in span::subspan(offset, count)");
|
||||
_LIBCPP_ASSERT(__count <= size() || __count == dynamic_extent, "Count out of range in span::subspan(offset, count)");
|
||||
_LIBCPP_ASSERT(__offset <= size(), "span<T, N>::subspan(offset, count): offset out of range");
|
||||
if (__count == dynamic_extent)
|
||||
return {data() + __offset, size() - __offset};
|
||||
_LIBCPP_ASSERT(__offset <= size() - __count, "count + offset out of range in span::subspan(offset, count)");
|
||||
_LIBCPP_ASSERT(__count <= size() - __offset, "span<T, N>::subspan(offset, count): offset + count out of range");
|
||||
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 size_type size() const noexcept { return _Extent; }
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr size_type size_bytes() const noexcept { return _Extent * sizeof(element_type); }
|
||||
[[nodiscard]] _LIBCPP_INLINE_VISIBILITY constexpr bool empty() const noexcept { return _Extent == 0; }
|
||||
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr reference operator[](index_type __idx) const noexcept
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr reference operator[](size_type __idx) const noexcept
|
||||
{
|
||||
_LIBCPP_ASSERT(__idx >= 0 && __idx < size(), "span<T,N>[] index out of bounds");
|
||||
return __data[__idx];
|
||||
_LIBCPP_ASSERT(__idx < size(), "span<T, N>::operator[](index): index out of range");
|
||||
return __data_[__idx];
|
||||
}
|
||||
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr reference front() const noexcept
|
||||
{
|
||||
static_assert(_Extent > 0, "span<T,N>[].front() on empty span");
|
||||
return __data[0];
|
||||
_LIBCPP_ASSERT(!empty(), "span<T, N>::front() on empty span");
|
||||
return __data_[0];
|
||||
}
|
||||
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr reference back() const noexcept
|
||||
{
|
||||
static_assert(_Extent > 0, "span<T,N>[].back() on empty span");
|
||||
return __data[size()-1];
|
||||
_LIBCPP_ASSERT(!empty(), "span<T, N>::back() on empty span");
|
||||
return __data_[size()-1];
|
||||
}
|
||||
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr pointer data() const noexcept { return __data; }
|
||||
_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 iterator begin() const noexcept {
|
||||
#ifdef _LIBCPP_DEBUG_ITERATOR_BOUNDS_CHECKING
|
||||
return std::__make_bounded_iter(data(), data(), data() + size());
|
||||
#else
|
||||
return iterator(this, data());
|
||||
#endif
|
||||
}
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr iterator end() const noexcept {
|
||||
#ifdef _LIBCPP_DEBUG_ITERATOR_BOUNDS_CHECKING
|
||||
return std::__make_bounded_iter(data() + size(), data(), data() + size());
|
||||
#else
|
||||
return iterator(this, data() + size());
|
||||
#endif
|
||||
}
|
||||
_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()}; }
|
||||
{ return span<const byte, _Extent * sizeof(element_type)>{reinterpret_cast<const byte *>(data()), size_bytes()}; }
|
||||
|
||||
_LIBCPP_INLINE_VISIBILITY span<byte, _Extent * sizeof(element_type)> __as_writable_bytes() const noexcept
|
||||
{ return {reinterpret_cast<byte *>(data()), size_bytes()}; }
|
||||
{ return span<byte, _Extent * sizeof(element_type)>{reinterpret_cast<byte *>(data()), size_bytes()}; }
|
||||
|
||||
private:
|
||||
pointer __data;
|
||||
|
||||
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 = size_t;
|
||||
using size_type = size_t;
|
||||
using difference_type = ptrdiff_t;
|
||||
using pointer = _Tp *;
|
||||
using const_pointer = const _Tp *;
|
||||
using reference = _Tp &;
|
||||
using const_reference = const _Tp &;
|
||||
using iterator = __wrap_iter<pointer>;
|
||||
using const_iterator = __wrap_iter<const_pointer>;
|
||||
#ifdef _LIBCPP_DEBUG_ITERATOR_BOUNDS_CHECKING
|
||||
using iterator = __bounded_iter<pointer>;
|
||||
#else
|
||||
using iterator = __wrap_iter<pointer>;
|
||||
#endif
|
||||
using reverse_iterator = _VSTD::reverse_iterator<iterator>;
|
||||
using const_reverse_iterator = _VSTD::reverse_iterator<const_iterator>;
|
||||
|
||||
static constexpr index_type extent = dynamic_extent;
|
||||
static constexpr size_type extent = dynamic_extent;
|
||||
|
||||
// [span.cons], span constructors, copy, assignment, and destructor
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr span() noexcept : __data{nullptr}, __size{0} {}
|
||||
_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{static_cast<size_t>(distance(__f, __l))} {}
|
||||
template <__span_compatible_iterator<element_type> _It>
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
constexpr span(_It __first, size_type __count)
|
||||
: __data_{_VSTD::to_address(__first)}, __size_{__count} {}
|
||||
|
||||
template <__span_compatible_iterator<element_type> _It, __span_compatible_sentinel_for<_It> _End>
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr span(_It __first, _End __last)
|
||||
: __data_(_VSTD::to_address(__first)), __size_(__last - __first) {
|
||||
_LIBCPP_ASSERT(__last - __first >= 0, "invalid range in span's constructor (iterator, sentinel)");
|
||||
}
|
||||
|
||||
template <size_t _Sz>
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
constexpr span(element_type (&__arr)[_Sz]) noexcept : __data{__arr}, __size{_Sz} {}
|
||||
constexpr span(type_identity_t<element_type> (&__arr)[_Sz]) noexcept : __data_{__arr}, __size_{_Sz} {}
|
||||
|
||||
template <size_t _Sz>
|
||||
template <__span_array_convertible<element_type> _OtherElementType, size_t _Sz>
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
constexpr span(array<value_type, _Sz>& __arr) noexcept : __data{__arr.data()}, __size{_Sz} {}
|
||||
constexpr span(array<_OtherElementType, _Sz>& __arr) noexcept : __data_{__arr.data()}, __size_{_Sz} {}
|
||||
|
||||
template <size_t _Sz>
|
||||
template <class _OtherElementType, size_t _Sz>
|
||||
requires __span_array_convertible<const _OtherElementType, element_type>
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
constexpr span(const array<value_type, _Sz>& __arr) noexcept : __data{__arr.data()}, __size{_Sz} {}
|
||||
constexpr span(const array<_OtherElementType, _Sz>& __arr) noexcept : __data_{__arr.data()}, __size_{_Sz} {}
|
||||
|
||||
template <class _Container>
|
||||
template <__span_compatible_range<element_type> _Range>
|
||||
_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)} {}
|
||||
constexpr span(_Range&& __r) : __data_(ranges::data(__r)), __size_{ranges::size(__r)} {}
|
||||
|
||||
template <class _Container>
|
||||
template <__span_array_convertible<element_type> _OtherElementType, size_t _OtherExtent>
|
||||
_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, size_t _OtherExtent>
|
||||
_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()} {}
|
||||
constexpr span(const span<_OtherElementType, _OtherExtent>& __other) noexcept
|
||||
: __data_{__other.data()}, __size_{__other.size()} {}
|
||||
|
||||
// ~span() noexcept = default;
|
||||
|
||||
|
|
@ -416,98 +452,94 @@ public:
|
|||
_LIBCPP_INLINE_VISIBILITY
|
||||
constexpr span<element_type, _Count> first() const noexcept
|
||||
{
|
||||
_LIBCPP_ASSERT(_Count <= size(), "Count out of range in span::first()");
|
||||
return {data(), _Count};
|
||||
_LIBCPP_ASSERT(_Count <= size(), "span<T>::first<Count>(): Count out of range");
|
||||
return span<element_type, _Count>{data(), _Count};
|
||||
}
|
||||
|
||||
template <size_t _Count>
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
constexpr span<element_type, _Count> last() const noexcept
|
||||
{
|
||||
_LIBCPP_ASSERT(_Count <= size(), "Count out of range in span::last()");
|
||||
return {data() + size() - _Count, _Count};
|
||||
_LIBCPP_ASSERT(_Count <= size(), "span<T>::last<Count>(): Count out of range");
|
||||
return span<element_type, _Count>{data() + size() - _Count, _Count};
|
||||
}
|
||||
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
constexpr span<element_type, dynamic_extent> first(index_type __count) const noexcept
|
||||
constexpr span<element_type, dynamic_extent> first(size_type __count) const noexcept
|
||||
{
|
||||
_LIBCPP_ASSERT(__count <= size(), "Count out of range in span::first(count)");
|
||||
_LIBCPP_ASSERT(__count <= size(), "span<T>::first(count): count out of range");
|
||||
return {data(), __count};
|
||||
}
|
||||
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
constexpr span<element_type, dynamic_extent> last (index_type __count) const noexcept
|
||||
constexpr span<element_type, dynamic_extent> last (size_type __count) const noexcept
|
||||
{
|
||||
_LIBCPP_ASSERT(__count <= size(), "Count out of range in span::last(count)");
|
||||
_LIBCPP_ASSERT(__count <= size(), "span<T>::last(count): count out of range");
|
||||
return {data() + size() - __count, __count};
|
||||
}
|
||||
|
||||
template <size_t _Offset, size_t _Count = dynamic_extent>
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
constexpr span<_Tp, dynamic_extent> subspan() const noexcept
|
||||
constexpr span<element_type, _Count> subspan() const noexcept
|
||||
{
|
||||
_LIBCPP_ASSERT(_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};
|
||||
_LIBCPP_ASSERT(_Offset <= size(), "span<T>::subspan<Offset, Count>(): Offset out of range");
|
||||
_LIBCPP_ASSERT(_Count == dynamic_extent || _Count <= size() - _Offset, "span<T>::subspan<Offset, Count>(): Offset + Count out of range");
|
||||
return span<element_type, _Count>{data() + _Offset, _Count == dynamic_extent ? size() - _Offset : _Count};
|
||||
}
|
||||
|
||||
constexpr span<element_type, dynamic_extent>
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
subspan(index_type __offset, index_type __count = dynamic_extent) const noexcept
|
||||
subspan(size_type __offset, size_type __count = dynamic_extent) const noexcept
|
||||
{
|
||||
_LIBCPP_ASSERT(__offset <= size(), "Offset out of range in span::subspan(offset, count)");
|
||||
_LIBCPP_ASSERT(__count <= size() || __count == dynamic_extent, "count out of range in span::subspan(offset, count)");
|
||||
_LIBCPP_ASSERT(__offset <= size(), "span<T>::subspan(offset, count): offset out of range");
|
||||
if (__count == dynamic_extent)
|
||||
return {data() + __offset, size() - __offset};
|
||||
_LIBCPP_ASSERT(__offset <= size() - __count, "Offset + count out of range in span::subspan(offset, count)");
|
||||
_LIBCPP_ASSERT(__count <= size() - __offset, "span<T>::subspan(offset, count): offset + count out of range");
|
||||
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 size_type size() const noexcept { return __size_; }
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr size_type size_bytes() const noexcept { return __size_ * sizeof(element_type); }
|
||||
[[nodiscard]] _LIBCPP_INLINE_VISIBILITY constexpr bool empty() const noexcept { return __size_ == 0; }
|
||||
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr reference operator[](index_type __idx) const noexcept
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr reference operator[](size_type __idx) const noexcept
|
||||
{
|
||||
_LIBCPP_ASSERT(__idx >= 0 && __idx < size(), "span<T>[] index out of bounds");
|
||||
return __data[__idx];
|
||||
_LIBCPP_ASSERT(__idx < size(), "span<T>::operator[](index): index out of range");
|
||||
return __data_[__idx];
|
||||
}
|
||||
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr reference front() const noexcept
|
||||
{
|
||||
_LIBCPP_ASSERT(!empty(), "span<T>[].front() on empty span");
|
||||
return __data[0];
|
||||
_LIBCPP_ASSERT(!empty(), "span<T>::front() on empty span");
|
||||
return __data_[0];
|
||||
}
|
||||
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr reference back() const noexcept
|
||||
{
|
||||
_LIBCPP_ASSERT(!empty(), "span<T>[].back() on empty span");
|
||||
return __data[size()-1];
|
||||
_LIBCPP_ASSERT(!empty(), "span<T>::back() on empty span");
|
||||
return __data_[size()-1];
|
||||
}
|
||||
|
||||
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr pointer data() const noexcept { return __data; }
|
||||
_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 iterator begin() const noexcept {
|
||||
#ifdef _LIBCPP_DEBUG_ITERATOR_BOUNDS_CHECKING
|
||||
return std::__make_bounded_iter(data(), data(), data() + size());
|
||||
#else
|
||||
return iterator(this, data());
|
||||
#endif
|
||||
}
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr iterator end() const noexcept {
|
||||
#ifdef _LIBCPP_DEBUG_ITERATOR_BOUNDS_CHECKING
|
||||
return std::__make_bounded_iter(data() + size(), data(), data() + size());
|
||||
#else
|
||||
return iterator(this, data() + size());
|
||||
#endif
|
||||
}
|
||||
_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()}; }
|
||||
|
|
@ -516,58 +548,32 @@ public:
|
|||
{ return {reinterpret_cast<byte *>(data()), size_bytes()}; }
|
||||
|
||||
private:
|
||||
pointer __data;
|
||||
index_type __size;
|
||||
pointer __data_;
|
||||
size_type __size_;
|
||||
};
|
||||
|
||||
// tuple interface
|
||||
template <class _Tp, size_t _Size>
|
||||
struct _LIBCPP_TEMPLATE_VIS tuple_size<span<_Tp, _Size>>
|
||||
: public integral_constant<size_t, _Size> {};
|
||||
|
||||
template <class _Tp>
|
||||
struct _LIBCPP_TEMPLATE_VIS tuple_size<span<_Tp, dynamic_extent>>; // declared but not defined
|
||||
|
||||
|
||||
template <size_t _Ip, class _Tp, size_t _Size>
|
||||
struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, span<_Tp, _Size>>
|
||||
{
|
||||
static_assert( dynamic_extent != _Size, "std::tuple_element<> not supported for std::span<T, dynamic_extent>");
|
||||
static_assert(_Ip < _Size, "Index out of bounds in std::tuple_element<> (std::span)");
|
||||
typedef _Tp type;
|
||||
};
|
||||
|
||||
template <size_t _Ip, class _Tp, size_t _Size>
|
||||
_LIBCPP_INLINE_VISIBILITY constexpr
|
||||
_Tp&
|
||||
get(span<_Tp, _Size> __s) noexcept
|
||||
{
|
||||
static_assert( dynamic_extent != _Size, "std::get<> not supported for std::span<T, dynamic_extent>");
|
||||
static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::span)");
|
||||
return __s[_Ip];
|
||||
}
|
||||
template <class _Tp, size_t _Extent>
|
||||
inline constexpr bool ranges::enable_borrowed_range<span<_Tp, _Extent> > = true;
|
||||
|
||||
template <class _ElementType, size_t _Extent>
|
||||
inline constexpr bool ranges::enable_view<span<_ElementType, _Extent>> = true;
|
||||
|
||||
// as_bytes & as_writable_bytes
|
||||
template <class _Tp, size_t _Extent>
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
auto as_bytes(span<_Tp, _Extent> __s) noexcept
|
||||
-> decltype(__s.__as_bytes())
|
||||
{ return __s.__as_bytes(); }
|
||||
{ return __s.__as_bytes(); }
|
||||
|
||||
template <class _Tp, size_t _Extent>
|
||||
template <class _Tp, size_t _Extent> requires(!is_const_v<_Tp>)
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
auto as_writable_bytes(span<_Tp, _Extent> __s) noexcept
|
||||
-> enable_if_t<!is_const_v<_Tp>, decltype(__s.__as_writable_bytes())>
|
||||
{ return __s.__as_writable_bytes(); }
|
||||
|
||||
template <class _Tp, size_t _Extent>
|
||||
_LIBCPP_INLINE_VISIBILITY
|
||||
constexpr void swap(span<_Tp, _Extent> &__lhs, span<_Tp, _Extent> &__rhs) noexcept
|
||||
{ __lhs.swap(__rhs); }
|
||||
#if _LIBCPP_STD_VER >= 20
|
||||
template<contiguous_iterator _It, class _EndOrSize>
|
||||
span(_It, _EndOrSize) -> span<remove_reference_t<iter_reference_t<_It>>>;
|
||||
#endif // _LIBCPP_STD_VER >= 20
|
||||
|
||||
|
||||
// Deduction guides
|
||||
template<class _Tp, size_t _Sz>
|
||||
span(_Tp (&)[_Sz]) -> span<_Tp, _Sz>;
|
||||
|
||||
|
|
@ -577,14 +583,20 @@ template<class _Tp, size_t _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<ranges::contiguous_range _Range>
|
||||
span(_Range&&) -> span<remove_reference_t<ranges::range_reference_t<_Range>>>;
|
||||
|
||||
template<class _Container>
|
||||
span(const _Container&) -> span<const typename _Container::value_type>;
|
||||
|
||||
#endif // _LIBCPP_STD_VER > 17
|
||||
#endif // _LIBCPP_STD_VER >= 20
|
||||
|
||||
_LIBCPP_END_NAMESPACE_STD
|
||||
|
||||
_LIBCPP_POP_MACROS
|
||||
|
||||
#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
|
||||
# include <concepts>
|
||||
# include <functional>
|
||||
# include <iterator>
|
||||
# include <type_traits>
|
||||
#endif
|
||||
|
||||
#endif // _LIBCPP_SPAN
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue