| 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 I> |
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| 12 | // concept permutable = see below; // Since C++20 |
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| 13 | |
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| 14 | #include <iterator> |
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| 15 | |
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| 16 | #include "test_iterators.h" |
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| 17 | |
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| 18 | using AllConstraintsSatisfied = forward_iterator<int*>; |
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| 19 | static_assert( std::forward_iterator<AllConstraintsSatisfied>); |
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| 20 | static_assert( std::indirectly_movable_storable<AllConstraintsSatisfied, AllConstraintsSatisfied>); |
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| 21 | static_assert( std::indirectly_swappable<AllConstraintsSatisfied>); |
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| 22 | static_assert( std::permutable<AllConstraintsSatisfied>); |
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| 23 | |
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| 24 | using NotAForwardIterator = cpp20_input_iterator<int*>; |
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| 25 | static_assert(!std::forward_iterator<NotAForwardIterator>); |
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| 26 | static_assert( std::indirectly_movable_storable<NotAForwardIterator, NotAForwardIterator>); |
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| 27 | static_assert( std::indirectly_swappable<NotAForwardIterator>); |
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| 28 | static_assert(!std::permutable<NotAForwardIterator>); |
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| 29 | |
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| 30 | struct NonCopyable { |
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| 31 | NonCopyable(const NonCopyable&) = delete; |
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| 32 | NonCopyable& operator=(const NonCopyable&) = delete; |
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| 33 | friend void swap(NonCopyable&, NonCopyable&); |
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| 34 | }; |
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| 35 | using NotIMS = forward_iterator<NonCopyable*>; |
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| 36 | |
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| 37 | static_assert( std::forward_iterator<NotIMS>); |
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| 38 | static_assert(!std::indirectly_movable_storable<NotIMS, NotIMS>); |
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| 39 | static_assert( std::indirectly_swappable<NotIMS>); |
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| 40 | static_assert(!std::permutable<NotIMS>); |
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| 41 | |
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| 42 | // Note: it is impossible for an iterator to satisfy `indirectly_movable_storable` but not `indirectly_swappable`: |
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| 43 | // `indirectly_swappable` requires both iterators to be `indirectly_readable` and for `ranges::iter_swap` to be |
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| 44 | // well-formed for both iterators. `indirectly_movable_storable` also requires the iterator to be `indirectly_readable`. |
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| 45 | // `ranges::iter_swap` is always defined for `indirectly_movable_storable` iterators. |
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| 46 | |
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