//===----------------------------------------------------------------------===// // // 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 // concept equivalence_relation; #include // clang-format off template requires std::relation constexpr bool check_subsumption() { return false; } template requires std::equivalence_relation && true constexpr bool check_subsumption() { return false; } template requires std::equivalence_relation && true constexpr bool check_subsumption() { return true; } // clang-format on static_assert(check_subsumption()); static_assert(check_subsumption()); struct S1 {}; struct S2 {}; struct R { bool operator()(S1, S1) const; bool operator()(S1, S2) const; bool operator()(S2, S1) const; bool operator()(S2, S2) const; }; static_assert(check_subsumption()); static_assert(check_subsumption()); // clang-format off template requires std::relation && true constexpr bool check_reverse_subsumption() { return true; } template requires std::equivalence_relation constexpr bool check_no_subsumption() { return false; } // clang-format on static_assert(check_reverse_subsumption()); static_assert(check_reverse_subsumption()); static_assert(check_reverse_subsumption()); static_assert(check_reverse_subsumption()); int main(int, char**) { return 0; }