| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 10 | |
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| 11 | // template<class F, class... Args> |
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| 12 | // concept equivalence_relation; |
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| 13 | |
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| 14 | #include <concepts> |
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| 15 | |
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| 16 | static_assert(std::equivalence_relation<bool(int, int), int, int>); |
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| 17 | static_assert(std::equivalence_relation<bool(int, int), double, double>); |
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| 18 | static_assert(std::equivalence_relation<bool(int, double), double, double>); |
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| 19 | |
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| 20 | static_assert(!std::equivalence_relation<bool (*)(), int, double>); |
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| 21 | static_assert(!std::equivalence_relation<bool (*)(int), int, double>); |
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| 22 | static_assert(!std::equivalence_relation<bool (*)(double), int, double>); |
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| 23 | |
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| 24 | static_assert( |
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| 25 | !std::equivalence_relation<bool(double, double*), double, double*>); |
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| 26 | static_assert(!std::equivalence_relation<bool(int&, int&), double&, double&>); |
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| 27 | |
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| 28 | struct S1 {}; |
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| 29 | static_assert(std::relation<bool (S1::*)(S1*), S1*, S1*>); |
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| 30 | static_assert(std::relation<bool (S1::*)(S1&), S1&, S1&>); |
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| 31 | |
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| 32 | struct S2 {}; |
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| 33 | |
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| 34 | struct P1 { |
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| 35 | bool operator()(S1, S1) const; |
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| 36 | }; |
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| 37 | static_assert(std::equivalence_relation<P1, S1, S1>); |
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| 38 | |
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| 39 | struct P2 { |
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| 40 | bool operator()(S1, S1) const; |
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| 41 | bool operator()(S1, S2) const; |
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| 42 | }; |
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| 43 | static_assert(!std::equivalence_relation<P2, S1, S2>); |
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| 44 | |
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| 45 | struct P3 { |
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| 46 | bool operator()(S1, S1) const; |
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| 47 | bool operator()(S1, S2) const; |
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| 48 | bool operator()(S2, S1) const; |
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| 49 | }; |
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| 50 | static_assert(!std::equivalence_relation<P3, S1, S2>); |
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| 51 | |
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| 52 | struct P4 { |
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| 53 | bool operator()(S1, S1) const; |
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| 54 | bool operator()(S1, S2) const; |
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| 55 | bool operator()(S2, S1) const; |
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| 56 | bool operator()(S2, S2) const; |
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| 57 | }; |
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| 58 | static_assert(std::equivalence_relation<P4, S1, S2>); |
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| 59 | |
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