4f15267d3d
This change is almost fully mechanical. The only interesting change is in `generate_feature_test_macro_components.py` to generate `_LIBCPP_STD_VER >=` instead. To avoid churn in the git-blame this commit should be added to the `.git-blame-ignore-revs` once committed. Reviewed By: ldionne, var-const, #libc Spies: jloser, libcxx-commits, arichardson, arphaman, wenlei Differential Revision: https://reviews.llvm.org/D143962
89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___RANGES_REF_VIEW_H
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#define _LIBCPP___RANGES_REF_VIEW_H
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#include <__concepts/convertible_to.h>
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#include <__concepts/different_from.h>
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__iterator/incrementable_traits.h>
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#include <__iterator/iterator_traits.h>
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#include <__memory/addressof.h>
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#include <__ranges/access.h>
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#include <__ranges/concepts.h>
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#include <__ranges/data.h>
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#include <__ranges/empty.h>
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#include <__ranges/enable_borrowed_range.h>
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#include <__ranges/size.h>
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#include <__ranges/view_interface.h>
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#include <__utility/forward.h>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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namespace ranges {
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template<range _Range>
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requires is_object_v<_Range>
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class ref_view : public view_interface<ref_view<_Range>> {
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_Range *__range_;
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static void __fun(_Range&);
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static void __fun(_Range&&) = delete;
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public:
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template<class _Tp>
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requires __different_from<_Tp, ref_view> &&
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convertible_to<_Tp, _Range&> && requires { __fun(std::declval<_Tp>()); }
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_LIBCPP_HIDE_FROM_ABI
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constexpr ref_view(_Tp&& __t)
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: __range_(std::addressof(static_cast<_Range&>(std::forward<_Tp>(__t))))
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{}
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_LIBCPP_HIDE_FROM_ABI constexpr _Range& base() const { return *__range_; }
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_LIBCPP_HIDE_FROM_ABI constexpr iterator_t<_Range> begin() const { return ranges::begin(*__range_); }
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_LIBCPP_HIDE_FROM_ABI constexpr sentinel_t<_Range> end() const { return ranges::end(*__range_); }
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_LIBCPP_HIDE_FROM_ABI
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constexpr bool empty() const
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requires requires { ranges::empty(*__range_); }
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{ return ranges::empty(*__range_); }
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_LIBCPP_HIDE_FROM_ABI
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constexpr auto size() const
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requires sized_range<_Range>
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{ return ranges::size(*__range_); }
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_LIBCPP_HIDE_FROM_ABI
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constexpr auto data() const
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requires contiguous_range<_Range>
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{ return ranges::data(*__range_); }
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};
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template<class _Range>
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ref_view(_Range&) -> ref_view<_Range>;
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template<class _Tp>
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inline constexpr bool enable_borrowed_range<ref_view<_Tp>> = true;
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} // namespace ranges
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___RANGES_REF_VIEW_H
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