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Diffstat (limited to 'gnu/llvm/libcxx/include/span')
| -rw-r--r-- | gnu/llvm/libcxx/include/span | 591 |
1 files changed, 591 insertions, 0 deletions
diff --git a/gnu/llvm/libcxx/include/span b/gnu/llvm/libcxx/include/span new file mode 100644 index 00000000000..3421ca0f5a8 --- /dev/null +++ b/gnu/llvm/libcxx/include/span @@ -0,0 +1,591 @@ +// -*- C++ -*- +//===------------------------------ span ---------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===---------------------------------------------------------------------===// + +#ifndef _LIBCPP_SPAN +#define _LIBCPP_SPAN + +/* + span synopsis + +namespace std { + +// constants +inline constexpr size_t dynamic_extent = numeric_limits<size_t>::max(); + +// [views.span], class template span +template <class ElementType, size_t Extent = dynamic_extent> + class span; + +// [span.objectrep], views of object representation +template <class ElementType, size_t Extent> + span<const byte, ((Extent == dynamic_extent) ? dynamic_extent : + (sizeof(ElementType) * Extent))> as_bytes(span<ElementType, Extent> s) noexcept; + +template <class ElementType, size_t Extent> + span< byte, ((Extent == dynamic_extent) ? dynamic_extent : + (sizeof(ElementType) * Extent))> as_writable_bytes(span<ElementType, Extent> s) noexcept; + + +namespace std { +template <class ElementType, size_t Extent = dynamic_extent> +class span { +public: + // constants and types + using element_type = ElementType; + using value_type = remove_cv_t<ElementType>; + using size_type = size_t; + using difference_type = ptrdiff_t; + using pointer = element_type*; + using const_pointer = const element_type*; + using reference = element_type&; + using const_reference = const element_type&; + using iterator = implementation-defined; + using const_iterator = implementation-defined; + using reverse_iterator = std::reverse_iterator<iterator>; + using const_reverse_iterator = std::reverse_iterator<const_iterator>; + static constexpr size_type extent = Extent; + + // [span.cons], span constructors, copy, assignment, and destructor + constexpr span() noexcept; + constexpr span(pointer ptr, size_type count); + constexpr span(pointer firstElem, pointer lastElem); + template <size_t N> + constexpr span(element_type (&arr)[N]) noexcept; + template <size_t N> + constexpr span(array<value_type, N>& arr) noexcept; + template <size_t N> + constexpr span(const array<value_type, N>& arr) noexcept; + template <class Container> + constexpr span(Container& cont); + template <class Container> + constexpr span(const Container& cont); + constexpr span(const span& other) noexcept = default; + template <class OtherElementType, size_t OtherExtent> + constexpr span(const span<OtherElementType, OtherExtent>& s) noexcept; + ~span() noexcept = default; + constexpr span& operator=(const span& other) noexcept = default; + + // [span.sub], span subviews + template <size_t Count> + constexpr span<element_type, Count> first() const; + template <size_t Count> + constexpr span<element_type, Count> last() const; + template <size_t Offset, size_t Count = dynamic_extent> + constexpr span<element_type, see below> subspan() const; + + constexpr span<element_type, dynamic_extent> first(size_type count) const; + constexpr span<element_type, dynamic_extent> last(size_type count) const; + constexpr span<element_type, dynamic_extent> subspan(size_type offset, size_type count = dynamic_extent) const; + + // [span.obs], span observers + constexpr size_type size() const noexcept; + constexpr size_type size_bytes() const noexcept; + constexpr bool empty() const noexcept; + + // [span.elem], span element access + constexpr reference operator[](size_type idx) const; + constexpr reference front() const; + constexpr reference back() const; + constexpr pointer data() const noexcept; + + // [span.iterators], span iterator support + constexpr iterator begin() const noexcept; + constexpr iterator end() const noexcept; + constexpr const_iterator cbegin() const noexcept; + constexpr const_iterator cend() const noexcept; + constexpr reverse_iterator rbegin() const noexcept; + constexpr reverse_iterator rend() const noexcept; + constexpr const_reverse_iterator crbegin() const noexcept; + constexpr const_reverse_iterator crend() const noexcept; + +private: + pointer data_; // exposition only + size_type size_; // exposition only +}; + +template<class T, size_t N> + span(T (&)[N]) -> span<T, N>; + +template<class T, size_t N> + span(array<T, N>&) -> span<T, N>; + +template<class T, size_t N> + span(const array<T, N>&) -> span<const T, N>; + +template<class Container> + span(Container&) -> span<typename Container::value_type>; + +template<class Container> + span(const Container&) -> span<const typename Container::value_type>; + +} // namespace std + +*/ + +#include <__config> +#include <cstddef> // for ptrdiff_t +#include <iterator> // for iterators +#include <array> // for array +#include <type_traits> // for remove_cv, etc +#include <cstddef> // for byte + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +#pragma GCC system_header +#endif + +_LIBCPP_BEGIN_NAMESPACE_STD + +#if _LIBCPP_STD_VER > 17 + +inline constexpr size_t dynamic_extent = numeric_limits<size_t>::max(); +template <typename _Tp, size_t _Extent = dynamic_extent> class span; + + +template <class _Tp> +struct __is_span_impl : public false_type {}; + +template <class _Tp, size_t _Extent> +struct __is_span_impl<span<_Tp, _Extent>> : public true_type {}; + +template <class _Tp> +struct __is_span : public __is_span_impl<remove_cv_t<_Tp>> {}; + +template <class _Tp> +struct __is_std_array_impl : public false_type {}; + +template <class _Tp, size_t _Sz> +struct __is_std_array_impl<array<_Tp, _Sz>> : public true_type {}; + +template <class _Tp> +struct __is_std_array : public __is_std_array_impl<remove_cv_t<_Tp>> {}; + +template <class _Tp, class _ElementType, class = void> +struct __is_span_compatible_container : public false_type {}; + +template <class _Tp, class _ElementType> +struct __is_span_compatible_container<_Tp, _ElementType, + void_t< + // is not a specialization of span + typename enable_if<!__is_span<_Tp>::value, nullptr_t>::type, + // is not a specialization of array + typename enable_if<!__is_std_array<_Tp>::value, nullptr_t>::type, + // is_array_v<Container> is false, + typename enable_if<!is_array_v<_Tp>, nullptr_t>::type, + // data(cont) and size(cont) are well formed + decltype(data(declval<_Tp>())), + decltype(size(declval<_Tp>())), + // remove_pointer_t<decltype(data(cont))>(*)[] is convertible to ElementType(*)[] + typename enable_if< + is_convertible_v<remove_pointer_t<decltype(data(declval<_Tp &>()))>(*)[], + _ElementType(*)[]>, + nullptr_t>::type + >> + : public true_type {}; + + +template <typename _Tp, size_t _Extent> +class _LIBCPP_TEMPLATE_VIS span { +public: +// constants and types + using element_type = _Tp; + using value_type = remove_cv_t<_Tp>; + 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>; + using reverse_iterator = _VSTD::reverse_iterator<iterator>; + using const_reverse_iterator = _VSTD::reverse_iterator<const_iterator>; + + static constexpr size_type extent = _Extent; + +// [span.cons], span constructors, copy, assignment, and destructor + _LIBCPP_INLINE_VISIBILITY constexpr span() noexcept : __data{nullptr} + { static_assert(_Extent == 0, "Can't default construct a statically sized span with size > 0"); } + + constexpr span (const span&) noexcept = default; + constexpr span& operator=(const span&) noexcept = default; + + _LIBCPP_INLINE_VISIBILITY constexpr span(pointer __ptr, size_type __count) : __data{__ptr} + { (void)__count; _LIBCPP_ASSERT(_Extent == __count, "size mismatch in span's constructor (ptr, len)"); } + _LIBCPP_INLINE_VISIBILITY constexpr span(pointer __f, pointer __l) : __data{__f} + { (void)__l; _LIBCPP_ASSERT(_Extent == distance(__f, __l), "size mismatch in span's constructor (ptr, ptr)"); } + + _LIBCPP_INLINE_VISIBILITY constexpr span(element_type (&__arr)[_Extent]) noexcept : __data{__arr} {} + _LIBCPP_INLINE_VISIBILITY constexpr span( array<value_type, _Extent>& __arr) noexcept : __data{__arr.data()} {} + _LIBCPP_INLINE_VISIBILITY constexpr span(const array<value_type, _Extent>& __arr) noexcept : __data{__arr.data()} {} + + template <class _OtherElementType> + _LIBCPP_INLINE_VISIBILITY + constexpr span(const span<_OtherElementType, _Extent>& __other, + enable_if_t< + is_convertible_v<_OtherElementType(*)[], element_type (*)[]>, + nullptr_t> = nullptr) + : __data{__other.data()} {} + + template <class _OtherElementType> + _LIBCPP_INLINE_VISIBILITY + constexpr span(const span<_OtherElementType, dynamic_extent>& __other, + enable_if_t< + is_convertible_v<_OtherElementType(*)[], element_type (*)[]>, + nullptr_t> = nullptr) noexcept + : __data{__other.data()} { _LIBCPP_ASSERT(_Extent == __other.size(), "size mismatch in span's constructor (other span)"); } + + +// ~span() noexcept = default; + + template <size_t _Count> + _LIBCPP_INLINE_VISIBILITY + constexpr span<element_type, _Count> first() const noexcept + { + static_assert(_Count <= _Extent, "Count out of range in span::first()"); + return {data(), _Count}; + } + + template <size_t _Count> + _LIBCPP_INLINE_VISIBILITY + constexpr span<element_type, _Count> last() const noexcept + { + static_assert(_Count <= _Extent, "Count out of range in span::last()"); + return {data() + size() - _Count, _Count}; + } + + _LIBCPP_INLINE_VISIBILITY + constexpr span<element_type, dynamic_extent> first(size_type __count) const noexcept + { + _LIBCPP_ASSERT(__count <= size(), "Count out of range in span::first(count)"); + return {data(), __count}; + } + + _LIBCPP_INLINE_VISIBILITY + constexpr span<element_type, dynamic_extent> last(size_type __count) const noexcept + { + _LIBCPP_ASSERT(__count <= size(), "Count out of range in span::last(count)"); + return {data() + size() - __count, __count}; + } + + template <size_t _Offset, size_t _Count = dynamic_extent> + _LIBCPP_INLINE_VISIBILITY + 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}; + } + + + _LIBCPP_INLINE_VISIBILITY + constexpr span<element_type, dynamic_extent> + 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)"); + if (__count == dynamic_extent) + return {data() + __offset, size() - __offset}; + _LIBCPP_ASSERT(__offset <= size() - __count, "count + offset out of range in span::subspan(offset, count)"); + return {data() + __offset, __count}; + } + + _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); } + _LIBCPP_INLINE_VISIBILITY constexpr bool empty() const noexcept { return _Extent == 0; } + + _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_INLINE_VISIBILITY constexpr reference front() const noexcept + { + static_assert(_Extent > 0, "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_INLINE_VISIBILITY constexpr pointer data() const noexcept { return __data; } + +// [span.iter], span iterator support + _LIBCPP_INLINE_VISIBILITY constexpr iterator begin() const noexcept { return iterator(data()); } + _LIBCPP_INLINE_VISIBILITY constexpr iterator end() const noexcept { return iterator(data() + size()); } + _LIBCPP_INLINE_VISIBILITY constexpr const_iterator cbegin() const noexcept { return const_iterator(data()); } + _LIBCPP_INLINE_VISIBILITY constexpr const_iterator cend() const noexcept { return const_iterator(data() + size()); } + _LIBCPP_INLINE_VISIBILITY constexpr reverse_iterator rbegin() const noexcept { return reverse_iterator(end()); } + _LIBCPP_INLINE_VISIBILITY constexpr reverse_iterator rend() const noexcept { return reverse_iterator(begin()); } + _LIBCPP_INLINE_VISIBILITY constexpr const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(cend()); } + _LIBCPP_INLINE_VISIBILITY constexpr const_reverse_iterator crend() const noexcept { return const_reverse_iterator(cbegin()); } + + _LIBCPP_INLINE_VISIBILITY constexpr void swap(span &__other) noexcept + { + pointer __p = __data; + __data = __other.__data; + __other.__data = __p; + } + + _LIBCPP_INLINE_VISIBILITY span<const byte, _Extent * sizeof(element_type)> __as_bytes() const noexcept + { return {reinterpret_cast<const byte *>(data()), size_bytes()}; } + + _LIBCPP_INLINE_VISIBILITY span<byte, _Extent * sizeof(element_type)> __as_writable_bytes() const noexcept + { return {reinterpret_cast<byte *>(data()), size_bytes()}; } + +private: + pointer __data; + +}; + + +template <typename _Tp> +class _LIBCPP_TEMPLATE_VIS span<_Tp, dynamic_extent> { +private: + +public: +// constants and types + using element_type = _Tp; + using value_type = remove_cv_t<_Tp>; + using 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>; + using reverse_iterator = _VSTD::reverse_iterator<iterator>; + using const_reverse_iterator = _VSTD::reverse_iterator<const_iterator>; + + 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} {} + + constexpr span (const span&) noexcept = default; + constexpr span& operator=(const span&) noexcept = default; + + _LIBCPP_INLINE_VISIBILITY constexpr span(pointer __ptr, size_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 <size_t _Sz> + _LIBCPP_INLINE_VISIBILITY + constexpr span(element_type (&__arr)[_Sz]) noexcept : __data{__arr}, __size{_Sz} {} + + template <size_t _Sz> + _LIBCPP_INLINE_VISIBILITY + constexpr span(array<value_type, _Sz>& __arr) noexcept : __data{__arr.data()}, __size{_Sz} {} + + template <size_t _Sz> + _LIBCPP_INLINE_VISIBILITY + constexpr span(const array<value_type, _Sz>& __arr) noexcept : __data{__arr.data()}, __size{_Sz} {} + + template <class _Container> + _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{(size_type) _VSTD::size(__c)} {} + + template <class _Container> + _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{(size_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()} {} + +// ~span() noexcept = default; + + template <size_t _Count> + _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}; + } + + 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_INLINE_VISIBILITY + constexpr span<element_type, dynamic_extent> first(size_type __count) const noexcept + { + _LIBCPP_ASSERT(__count <= size(), "Count out of range in span::first(count)"); + return {data(), __count}; + } + + _LIBCPP_INLINE_VISIBILITY + constexpr span<element_type, dynamic_extent> last (size_type __count) const noexcept + { + _LIBCPP_ASSERT(__count <= size(), "Count out of range in span::last(count)"); + 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 + { + _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}; + } + + constexpr span<element_type, dynamic_extent> + _LIBCPP_INLINE_VISIBILITY + 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)"); + if (__count == dynamic_extent) + return {data() + __offset, size() - __offset}; + _LIBCPP_ASSERT(__offset <= size() - __count, "Offset + count out of range in span::subspan(offset, count)"); + return {data() + __offset, __count}; + } + + _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); } + _LIBCPP_INLINE_VISIBILITY constexpr bool empty() const noexcept { return __size == 0; } + + _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_INLINE_VISIBILITY constexpr reference front() const noexcept + { + _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_INLINE_VISIBILITY constexpr pointer data() const noexcept { return __data; } + +// [span.iter], span iterator support + _LIBCPP_INLINE_VISIBILITY constexpr iterator begin() const noexcept { return iterator(data()); } + _LIBCPP_INLINE_VISIBILITY constexpr iterator end() const noexcept { return iterator(data() + size()); } + _LIBCPP_INLINE_VISIBILITY constexpr const_iterator cbegin() const noexcept { return const_iterator(data()); } + _LIBCPP_INLINE_VISIBILITY constexpr const_iterator cend() const noexcept { return const_iterator(data() + size()); } + _LIBCPP_INLINE_VISIBILITY constexpr reverse_iterator rbegin() const noexcept { return reverse_iterator(end()); } + _LIBCPP_INLINE_VISIBILITY constexpr reverse_iterator rend() const noexcept { return reverse_iterator(begin()); } + _LIBCPP_INLINE_VISIBILITY constexpr const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(cend()); } + _LIBCPP_INLINE_VISIBILITY constexpr const_reverse_iterator crend() const noexcept { return const_reverse_iterator(cbegin()); } + + _LIBCPP_INLINE_VISIBILITY constexpr void swap(span &__other) noexcept + { + pointer __p = __data; + __data = __other.__data; + __other.__data = __p; + + size_type __sz = __size; + __size = __other.__size; + __other.__size = __sz; + } + + _LIBCPP_INLINE_VISIBILITY span<const byte, dynamic_extent> __as_bytes() const noexcept + { return {reinterpret_cast<const byte *>(data()), size_bytes()}; } + + _LIBCPP_INLINE_VISIBILITY span<byte, dynamic_extent> __as_writable_bytes() const noexcept + { return {reinterpret_cast<byte *>(data()), size_bytes()}; } + +private: + 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]; +} + + +// 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(); } + +template <class _Tp, size_t _Extent> +_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); } + + +// Deduction guides +template<class _Tp, size_t _Sz> + span(_Tp (&)[_Sz]) -> span<_Tp, _Sz>; + +template<class _Tp, size_t _Sz> + span(array<_Tp, _Sz>&) -> span<_Tp, _Sz>; + +template<class _Tp, size_t _Sz> + span(const array<_Tp, _Sz>&) -> span<const _Tp, _Sz>; + +template<class _Container> + span(_Container&) -> span<typename _Container::value_type>; + +template<class _Container> + span(const _Container&) -> span<const typename _Container::value_type>; + +#endif // _LIBCPP_STD_VER > 17 + +_LIBCPP_END_NAMESPACE_STD + +#endif // _LIBCPP_SPAN |