| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| // UNSUPPORTED: libcpp-no-concepts |
| |
| // template<class F, class... Args> |
| // concept predicate; |
| |
| #include <concepts> |
| |
| constexpr bool check_subsumption(std::regular_invocable auto) { |
| return false; |
| } |
| |
| // clang-format off |
| template<class F> |
| requires std::predicate<F> && true |
| constexpr bool check_subsumption(F) |
| { |
| return true; |
| } |
| // clang-format on |
| |
| static_assert(!check_subsumption([] {})); |
| static_assert(check_subsumption([] { return true; })); |