| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 10 | |
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| 11 | // template<class T> |
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| 12 | // inline constexpr bool enable_borrowed_range<common_view<T>> = enable_borrowed_range<T>; |
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| 13 | |
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| 14 | #include <ranges> |
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| 15 | |
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| 16 | // common_view can only wrap Ts that are `view<T> && !common_range<T>`, so we need to invent one. |
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| 17 | struct Uncommon : std::ranges::view_base { |
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| 18 | int *begin() const; |
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| 19 | std::unreachable_sentinel_t end() const; |
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| 20 | }; |
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| 21 | |
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| 22 | static_assert(!std::ranges::borrowed_range<std::ranges::common_view<Uncommon>>); |
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| 23 | static_assert(!std::ranges::borrowed_range<std::ranges::common_view<std::ranges::owning_view<Uncommon>>>); |
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| 24 | static_assert( std::ranges::borrowed_range<std::ranges::common_view<std::ranges::ref_view<Uncommon>>>); |
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| 25 | |
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