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 <__utility/move.h> 24 #include <type_traits> 25 26 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 27 # pragma GCC system_header 28 #endif 29 30 _LIBCPP_BEGIN_NAMESPACE_STD 31 32 #if _LIBCPP_STD_VER > 17 33 34 namespace ranges { 35 template<range _Rp> 36 requires movable<_Rp> && (!__is_std_initializer_list<remove_cvref_t<_Rp>>) 37 class owning_view : public view_interface<owning_view<_Rp>> { 38 _Rp __r_ = _Rp(); 39 40 public: 41 owning_view() requires default_initializable<_Rp> = default; 42 _LIBCPP_HIDE_FROM_ABI constexpr owning_view(_Rp&& __r) : __r_(std::move(__r)) {} 43 44 owning_view(owning_view&&) = default; 45 owning_view& operator=(owning_view&&) = default; 46 47 _LIBCPP_HIDE_FROM_ABI constexpr _Rp& base() & noexcept { return __r_; } 48 _LIBCPP_HIDE_FROM_ABI constexpr const _Rp& base() const& noexcept { return __r_; } 49 _LIBCPP_HIDE_FROM_ABI constexpr _Rp&& base() && noexcept { return std::move(__r_); } 50 _LIBCPP_HIDE_FROM_ABI constexpr const _Rp&& base() const&& noexcept { return std::move(__r_); } 51 52 _LIBCPP_HIDE_FROM_ABI constexpr iterator_t<_Rp> begin() { return ranges::begin(__r_); } 53 _LIBCPP_HIDE_FROM_ABI constexpr sentinel_t<_Rp> end() { return ranges::end(__r_); } 54 _LIBCPP_HIDE_FROM_ABI constexpr auto begin() const requires range<const _Rp> { return ranges::begin(__r_); } 55 _LIBCPP_HIDE_FROM_ABI constexpr auto end() const requires range<const _Rp> { return ranges::end(__r_); } 56 57 _LIBCPP_HIDE_FROM_ABI constexpr bool empty() requires requires { ranges::empty(__r_); } 58 { return ranges::empty(__r_); } 59 _LIBCPP_HIDE_FROM_ABI constexpr bool empty() const requires requires { ranges::empty(__r_); } 60 { return ranges::empty(__r_); } 61 62 _LIBCPP_HIDE_FROM_ABI constexpr auto size() requires sized_range<_Rp> 63 { return ranges::size(__r_); } 64 _LIBCPP_HIDE_FROM_ABI constexpr auto size() const requires sized_range<const _Rp> 65 { return ranges::size(__r_); } 66 67 _LIBCPP_HIDE_FROM_ABI constexpr auto data() requires contiguous_range<_Rp> 68 { return ranges::data(__r_); } 69 _LIBCPP_HIDE_FROM_ABI constexpr auto data() const requires contiguous_range<const _Rp> 70 { return ranges::data(__r_); } 71 }; 72 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(owning_view); 73 74 template<class _Tp> 75 inline constexpr bool enable_borrowed_range<owning_view<_Tp>> = enable_borrowed_range<_Tp>; 76 77 } // namespace ranges 78 79 #endif // _LIBCPP_STD_VER > 17 80 81 _LIBCPP_END_NAMESPACE_STD 82 83 #endif // _LIBCPP___RANGES_OWNING_VIEW_H 84