1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___RANGES_OWNING_VIEW_H 11 #define _LIBCPP___RANGES_OWNING_VIEW_H 12 13 #include <__concepts/constructible.h> 14 #include <__concepts/movable.h> 15 #include <__config> 16 #include <__ranges/access.h> 17 #include <__ranges/concepts.h> 18 #include <__ranges/data.h> 19 #include <__ranges/empty.h> 20 #include <__ranges/enable_borrowed_range.h> 21 #include <__ranges/size.h> 22 #include <__ranges/view_interface.h> 23 #include <__type_traits/remove_cvref.h> 24 #include <__utility/move.h> 25 26 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 27 # pragma GCC system_header 28 #endif 29 30 _LIBCPP_PUSH_MACROS 31 #include <__undef_macros> 32 33 _LIBCPP_BEGIN_NAMESPACE_STD 34 35 #if _LIBCPP_STD_VER >= 20 36 37 namespace ranges { 38 template <range _Rp> 39 requires movable<_Rp> && (!__is_std_initializer_list<remove_cvref_t<_Rp>>) 40 class owning_view : public view_interface<owning_view<_Rp>> { 41 _Rp __r_ = _Rp(); 42 43 public: 44 _LIBCPP_HIDE_FROM_ABI owning_view() 45 requires default_initializable<_Rp> 46 = default; 47 _LIBCPP_HIDE_FROM_ABI constexpr owning_view(_Rp&& __r) : __r_(std::move(__r)) {} 48 49 _LIBCPP_HIDE_FROM_ABI owning_view(owning_view&&) = default; 50 _LIBCPP_HIDE_FROM_ABI owning_view& operator=(owning_view&&) = default; 51 52 _LIBCPP_HIDE_FROM_ABI constexpr _Rp& base() & noexcept { return __r_; } 53 _LIBCPP_HIDE_FROM_ABI constexpr const _Rp& base() const& noexcept { return __r_; } 54 _LIBCPP_HIDE_FROM_ABI constexpr _Rp&& base() && noexcept { return std::move(__r_); } 55 _LIBCPP_HIDE_FROM_ABI constexpr const _Rp&& base() const&& noexcept { return std::move(__r_); } 56 57 _LIBCPP_HIDE_FROM_ABI constexpr iterator_t<_Rp> begin() { return ranges::begin(__r_); } 58 _LIBCPP_HIDE_FROM_ABI constexpr sentinel_t<_Rp> end() { return ranges::end(__r_); } 59 _LIBCPP_HIDE_FROM_ABI constexpr auto begin() const 60 requires range<const _Rp> 61 { 62 return ranges::begin(__r_); 63 } 64 _LIBCPP_HIDE_FROM_ABI constexpr auto end() const 65 requires range<const _Rp> 66 { 67 return ranges::end(__r_); 68 } 69 70 _LIBCPP_HIDE_FROM_ABI constexpr bool empty() 71 requires requires { ranges::empty(__r_); } 72 { 73 return ranges::empty(__r_); 74 } 75 _LIBCPP_HIDE_FROM_ABI constexpr bool empty() const 76 requires requires { ranges::empty(__r_); } 77 { 78 return ranges::empty(__r_); 79 } 80 81 _LIBCPP_HIDE_FROM_ABI constexpr auto size() 82 requires sized_range<_Rp> 83 { 84 return ranges::size(__r_); 85 } 86 _LIBCPP_HIDE_FROM_ABI constexpr auto size() const 87 requires sized_range<const _Rp> 88 { 89 return ranges::size(__r_); 90 } 91 92 _LIBCPP_HIDE_FROM_ABI constexpr auto data() 93 requires contiguous_range<_Rp> 94 { 95 return ranges::data(__r_); 96 } 97 _LIBCPP_HIDE_FROM_ABI constexpr auto data() const 98 requires contiguous_range<const _Rp> 99 { 100 return ranges::data(__r_); 101 } 102 }; 103 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(owning_view); 104 105 template <class _Tp> 106 inline constexpr bool enable_borrowed_range<owning_view<_Tp>> = enable_borrowed_range<_Tp>; 107 108 } // namespace ranges 109 110 #endif // _LIBCPP_STD_VER >= 20 111 112 _LIBCPP_END_NAMESPACE_STD 113 114 _LIBCPP_POP_MACROS 115 116 #endif // _LIBCPP___RANGES_OWNING_VIEW_H 117