25 lines
1.0 KiB
C++
25 lines
1.0 KiB
C++
//===----------------------------------------------------------------------===//
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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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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// template<class T>
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// inline constexpr bool enable_borrowed_range<common_view<T>> = enable_borrowed_range<T>;
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#include <ranges>
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// common_view can only wrap Ts that are `view<T> && !common_range<T>`, so we need to invent one.
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struct Uncommon : std::ranges::view_base {
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int *begin() const;
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std::unreachable_sentinel_t end() const;
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};
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static_assert(!std::ranges::borrowed_range<std::ranges::common_view<Uncommon>>);
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static_assert(!std::ranges::borrowed_range<std::ranges::common_view<std::ranges::owning_view<Uncommon>>>);
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static_assert( std::ranges::borrowed_range<std::ranges::common_view<std::ranges::ref_view<Uncommon>>>);
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