59 lines
1.8 KiB
C++
59 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 equivalence_relation;
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#include <concepts>
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static_assert(std::equivalence_relation<bool(int, int), int, int>);
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static_assert(std::equivalence_relation<bool(int, int), double, double>);
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static_assert(std::equivalence_relation<bool(int, double), double, double>);
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static_assert(!std::equivalence_relation<bool (*)(), int, double>);
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static_assert(!std::equivalence_relation<bool (*)(int), int, double>);
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static_assert(!std::equivalence_relation<bool (*)(double), int, double>);
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static_assert(
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!std::equivalence_relation<bool(double, double*), double, double*>);
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static_assert(!std::equivalence_relation<bool(int&, int&), double&, double&>);
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struct S1 {};
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static_assert(std::relation<bool (S1::*)(S1*), S1*, S1*>);
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static_assert(std::relation<bool (S1::*)(S1&), S1&, S1&>);
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struct S2 {};
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struct P1 {
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bool operator()(S1, S1) const;
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};
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static_assert(std::equivalence_relation<P1, S1, S1>);
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struct P2 {
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bool operator()(S1, S1) const;
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bool operator()(S1, S2) const;
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};
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static_assert(!std::equivalence_relation<P2, S1, S2>);
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struct P3 {
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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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};
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static_assert(!std::equivalence_relation<P3, S1, S2>);
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struct P4 {
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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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static_assert(std::equivalence_relation<P4, S1, S2>);
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