1//===----------------------------------------------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9#ifndef _LIBCPP___RANGES_AS_RVALUE_H 10#define _LIBCPP___RANGES_AS_RVALUE_H 11 12#include <__concepts/constructible.h> 13#include <__concepts/same_as.h> 14#include <__config> 15#include <__iterator/move_iterator.h> 16#include <__iterator/move_sentinel.h> 17#include <__ranges/access.h> 18#include <__ranges/all.h> 19#include <__ranges/concepts.h> 20#include <__ranges/enable_borrowed_range.h> 21#include <__ranges/range_adaptor.h> 22#include <__ranges/size.h> 23#include <__ranges/view_interface.h> 24#include <__utility/forward.h> 25#include <__utility/move.h> 26 27#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 28# pragma GCC system_header 29#endif 30 31_LIBCPP_PUSH_MACROS 32#include <__undef_macros> 33 34#if _LIBCPP_STD_VER >= 23 35 36_LIBCPP_BEGIN_NAMESPACE_STD 37 38namespace ranges { 39template <view _View> 40 requires input_range<_View> 41class as_rvalue_view : public view_interface<as_rvalue_view<_View>> { 42 _LIBCPP_NO_UNIQUE_ADDRESS _View __base_ = _View(); 43 44public: 45 _LIBCPP_HIDE_FROM_ABI as_rvalue_view() 46 requires default_initializable<_View> 47 = default; 48 49 _LIBCPP_HIDE_FROM_ABI constexpr explicit as_rvalue_view(_View __base) : __base_(std::move(__base)) {} 50 51 _LIBCPP_HIDE_FROM_ABI constexpr _View base() const& 52 requires copy_constructible<_View> 53 { 54 return __base_; 55 } 56 57 _LIBCPP_HIDE_FROM_ABI constexpr _View base() && { return std::move(__base_); } 58 59 _LIBCPP_HIDE_FROM_ABI constexpr auto begin() 60 requires(!__simple_view<_View>) 61 { 62 return move_iterator(ranges::begin(__base_)); 63 } 64 65 _LIBCPP_HIDE_FROM_ABI constexpr auto begin() const 66 requires range<const _View> 67 { 68 return move_iterator(ranges::begin(__base_)); 69 } 70 71 _LIBCPP_HIDE_FROM_ABI constexpr auto end() 72 requires(!__simple_view<_View>) 73 { 74 if constexpr (common_range<_View>) { 75 return move_iterator(ranges::end(__base_)); 76 } else { 77 return move_sentinel(ranges::end(__base_)); 78 } 79 } 80 81 _LIBCPP_HIDE_FROM_ABI constexpr auto end() const 82 requires range<const _View> 83 { 84 if constexpr (common_range<const _View>) { 85 return move_iterator(ranges::end(__base_)); 86 } else { 87 return move_sentinel(ranges::end(__base_)); 88 } 89 } 90 91 _LIBCPP_HIDE_FROM_ABI constexpr auto size() 92 requires sized_range<_View> 93 { 94 return ranges::size(__base_); 95 } 96 97 _LIBCPP_HIDE_FROM_ABI constexpr auto size() const 98 requires sized_range<const _View> 99 { 100 return ranges::size(__base_); 101 } 102}; 103 104template <class _Range> 105as_rvalue_view(_Range&&) -> as_rvalue_view<views::all_t<_Range>>; 106 107template <class _View> 108inline constexpr bool enable_borrowed_range<as_rvalue_view<_View>> = enable_borrowed_range<_View>; 109 110namespace views { 111namespace __as_rvalue { 112struct __fn : __range_adaptor_closure<__fn> { 113 template <class _Range> 114 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Range&& __range) const 115 noexcept(noexcept(/**/ as_rvalue_view(std::forward<_Range>(__range)))) 116 -> decltype(/*--*/ as_rvalue_view(std::forward<_Range>(__range))) { 117 return /*-------------*/ as_rvalue_view(std::forward<_Range>(__range)); 118 } 119 120 template <class _Range> 121 requires same_as<range_rvalue_reference_t<_Range>, range_reference_t<_Range>> 122 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Range&& __range) const 123 noexcept(noexcept(/**/ views::all(std::forward<_Range>(__range)))) 124 -> decltype(/*--*/ views::all(std::forward<_Range>(__range))) { 125 return /*-------------*/ views::all(std::forward<_Range>(__range)); 126 } 127}; 128} // namespace __as_rvalue 129 130inline namespace __cpo { 131inline constexpr auto as_rvalue = __as_rvalue::__fn{}; 132} // namespace __cpo 133} // namespace views 134} // namespace ranges 135 136_LIBCPP_END_NAMESPACE_STD 137 138#endif // _LIBCPP_STD_VER >= 23 139 140_LIBCPP_POP_MACROS 141 142#endif // _LIBCPP___RANGES_AS_RVALUE_H 143