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() requires default_initializable<_Rp> = default; 45 _LIBCPP_HIDE_FROM_ABI constexpr owning_view(_Rp&& __r) : __r_(std::move(__r)) {} 46 47 _LIBCPP_HIDE_FROM_ABI owning_view(owning_view&&) = default; 48 _LIBCPP_HIDE_FROM_ABI owning_view& operator=(owning_view&&) = default; 49 50 _LIBCPP_HIDE_FROM_ABI constexpr _Rp& base() & noexcept { return __r_; } 51 _LIBCPP_HIDE_FROM_ABI constexpr const _Rp& base() const& noexcept { return __r_; } 52 _LIBCPP_HIDE_FROM_ABI constexpr _Rp&& base() && noexcept { return std::move(__r_); } 53 _LIBCPP_HIDE_FROM_ABI constexpr const _Rp&& base() const&& noexcept { return std::move(__r_); } 54 55 _LIBCPP_HIDE_FROM_ABI constexpr iterator_t<_Rp> begin() { return ranges::begin(__r_); } 56 _LIBCPP_HIDE_FROM_ABI constexpr sentinel_t<_Rp> end() { return ranges::end(__r_); } 57 _LIBCPP_HIDE_FROM_ABI constexpr auto begin() const requires range<const _Rp> { return ranges::begin(__r_); } 58 _LIBCPP_HIDE_FROM_ABI constexpr auto end() const requires range<const _Rp> { return ranges::end(__r_); } 59 60 _LIBCPP_HIDE_FROM_ABI constexpr bool empty() requires requires { ranges::empty(__r_); } 61 { return ranges::empty(__r_); } 62 _LIBCPP_HIDE_FROM_ABI constexpr bool empty() const requires requires { ranges::empty(__r_); } 63 { return ranges::empty(__r_); } 64 65 _LIBCPP_HIDE_FROM_ABI constexpr auto size() requires sized_range<_Rp> 66 { return ranges::size(__r_); } 67 _LIBCPP_HIDE_FROM_ABI constexpr auto size() const requires sized_range<const _Rp> 68 { return ranges::size(__r_); } 69 70 _LIBCPP_HIDE_FROM_ABI constexpr auto data() requires contiguous_range<_Rp> 71 { return ranges::data(__r_); } 72 _LIBCPP_HIDE_FROM_ABI constexpr auto data() const requires contiguous_range<const _Rp> 73 { return ranges::data(__r_); } 74 }; 75 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(owning_view); 76 77 template<class _Tp> 78 inline constexpr bool enable_borrowed_range<owning_view<_Tp>> = enable_borrowed_range<_Tp>; 79 80 } // namespace ranges 81 82 #endif // _LIBCPP_STD_VER >= 20 83 84 _LIBCPP_END_NAMESPACE_STD 85 86 _LIBCPP_POP_MACROS 87 88 #endif // _LIBCPP___RANGES_OWNING_VIEW_H 89