| 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, class R = ranges::less, class P = identity> |
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| 12 | // concept sortable = 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 <functional> |
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| 17 | |
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| 18 | template <class I, class R, class P> void test_subsumption() requires std::permutable<I>; |
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| 19 | |
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| 20 | template <class I, class R, class P> void test_subsumption() |
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| 21 | requires std::indirect_strict_weak_order<R, std::projected<I, P>>; |
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| 22 | |
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| 23 | template <class I, class R, class P> constexpr bool test_subsumption() requires std::sortable<I, R, P> { return true; } |
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| 24 | |
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| 25 | static_assert(test_subsumption<int*, std::ranges::less, std::identity>()); |
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| 26 | |
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