| 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 F, class... Args> |
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| 12 | // concept predicate; |
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| 13 | |
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| 14 | #include <concepts> |
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| 15 | |
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| 16 | constexpr bool check_subsumption(std::regular_invocable auto) { |
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| 17 | return false; |
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| 18 | } |
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| 19 | |
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| 20 | // clang-format off |
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| 21 | template<class F> |
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| 22 | requires std::predicate<F> && true |
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| 23 | constexpr bool check_subsumption(F) |
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| 24 | { |
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| 25 | return true; |
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| 26 | } |
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| 27 | // clang-format on |
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| 28 | |
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| 29 | static_assert(!check_subsumption([] {})); |
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| 30 | static_assert(check_subsumption([] { return true; })); |
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| 31 | |
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