| 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 | // concept borrowed_range; |
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| 13 | |
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| 14 | #include <ranges> |
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| 15 | |
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| 16 | struct NotRange { |
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| 17 | int begin() const; |
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| 18 | int end() const; |
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| 19 | }; |
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| 20 | |
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| 21 | struct Range { |
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| 22 | int *begin(); |
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| 23 | int *end(); |
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| 24 | }; |
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| 25 | |
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| 26 | struct ConstRange { |
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| 27 | int *begin() const; |
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| 28 | int *end() const; |
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| 29 | }; |
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| 30 | |
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| 31 | struct BorrowedRange { |
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| 32 | int *begin() const; |
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| 33 | int *end() const; |
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| 34 | }; |
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| 35 | |
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| 36 | template<> |
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| 37 | inline constexpr bool std::ranges::enable_borrowed_range<BorrowedRange> = true; |
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| 38 | |
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| 39 | static_assert(!std::ranges::borrowed_range<NotRange>); |
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| 40 | static_assert(!std::ranges::borrowed_range<NotRange&>); |
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| 41 | static_assert(!std::ranges::borrowed_range<const NotRange>); |
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| 42 | static_assert(!std::ranges::borrowed_range<const NotRange&>); |
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| 43 | static_assert(!std::ranges::borrowed_range<NotRange&&>); |
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| 44 | |
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| 45 | static_assert(!std::ranges::borrowed_range<Range>); |
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| 46 | static_assert( std::ranges::borrowed_range<Range&>); |
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| 47 | static_assert(!std::ranges::borrowed_range<const Range>); |
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| 48 | static_assert(!std::ranges::borrowed_range<const Range&>); |
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| 49 | static_assert(!std::ranges::borrowed_range<Range&&>); |
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| 50 | |
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| 51 | static_assert(!std::ranges::borrowed_range<ConstRange>); |
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| 52 | static_assert( std::ranges::borrowed_range<ConstRange&>); |
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| 53 | static_assert(!std::ranges::borrowed_range<const ConstRange>); |
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| 54 | static_assert( std::ranges::borrowed_range<const ConstRange&>); |
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| 55 | static_assert(!std::ranges::borrowed_range<ConstRange&&>); |
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| 56 | |
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| 57 | static_assert( std::ranges::borrowed_range<BorrowedRange>); |
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| 58 | static_assert( std::ranges::borrowed_range<BorrowedRange&>); |
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| 59 | static_assert( std::ranges::borrowed_range<const BorrowedRange>); |
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| 60 | static_assert( std::ranges::borrowed_range<const BorrowedRange&>); |
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| 61 | static_assert( std::ranges::borrowed_range<BorrowedRange&&>); |
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| 62 | |
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