d2baefae68
All supported compilers that support C++20 now support concepts. So, remove `_LIB_LIBCPP_HAS_NO_CONCEPTS` in favor of `_LIBCPP_STD_VER > 17`. Similarly in the tests, remove `// UNSUPPORTED: libcpp-no-concepts`. Differential Revision: https://reviews.llvm.org/D121528
64 lines
1.8 KiB
C++
64 lines
1.8 KiB
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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// template<class F, class... Args>
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// concept relation;
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#include <concepts>
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struct S1 {};
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struct S2 {};
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struct R {
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bool operator()(S1, S1) const;
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bool operator()(S1, S2) const;
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bool operator()(S2, S1) const;
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bool operator()(S2, S2) const;
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};
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// clang-format off
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template<class F, class T, class U>
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requires std::predicate<F, T, T> && std::predicate<F, T, U> &&
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std::predicate<F, U, T> && std::predicate<F, U, U>
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constexpr bool check_relation_subsumes_predicate() {
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return false;
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}
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template<class F, class T, class U>
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requires std::relation<F, T, U> && true
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constexpr bool check_relation_subsumes_predicate() {
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return true;
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}
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// clang-format on
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static_assert(
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check_relation_subsumes_predicate<int (*)(int, double), int, int>());
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static_assert(
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check_relation_subsumes_predicate<int (*)(int, double), int, double>());
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static_assert(check_relation_subsumes_predicate<R, S1, S1>());
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static_assert(check_relation_subsumes_predicate<R, S1, S2>());
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// clang-format off
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template<class F, class T, class U>
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requires std::relation<F, T, T> && std::relation<F, U, U>
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constexpr bool check_relation_subsumes_itself() {
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return false;
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}
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template<class F, class T, class U>
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requires std::relation<F, T, U>
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constexpr bool check_relation_subsumes_itself() {
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return true;
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}
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// clang-format on
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static_assert(check_relation_subsumes_itself<int (*)(int, double), int, int>());
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static_assert(check_relation_subsumes_itself<R, S1, S1>());
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