96dbdd753a
* `std::predicate`
* `std::relation`
* `std::equivalence_relation`
* `std::strict_weak_order`
Implements parts of:
- P0898R3 Standard Library Concepts
- P1754 Rename concepts to standard_case for C++20, while we still can
Differential Revision: https://reviews.llvm.org/D96477
32 lines
885 B
C++
32 lines
885 B
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-no-concepts
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// template<class F, class... Args>
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// concept predicate;
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#include <concepts>
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[[nodiscard]] constexpr bool check_subsumption(std::regular_invocable auto) {
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return false;
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}
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// clang-format off
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template<class F>
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requires std::predicate<F> && true
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[[nodiscard]] constexpr bool check_subsumption(F)
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{
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return true;
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}
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// clang-format on
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static_assert(!check_subsumption([] {}));
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static_assert(check_subsumption([] { return true; }));
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