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99dee823 | 1 | // Copyright (C) 2019-2021 Free Software Foundation, Inc. |
cfc219ae JW |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
18 | // { dg-options "-std=gnu++2a" } | |
19 | // { dg-do compile { target c++2a } } | |
20 | ||
21 | #include <concepts> | |
22 | ||
23 | static_assert( std::common_reference_with<int, int> ); | |
24 | static_assert( std::common_reference_with<int, const int> ); | |
25 | static_assert( std::common_reference_with<int&&, const int&> ); | |
26 | static_assert( std::common_reference_with<int&, const int&&> ); | |
27 | static_assert( ! std::common_reference_with<int, void> ); | |
28 | static_assert( ! std::common_reference_with<int, int*> ); | |
29 | static_assert( ! std::common_reference_with<int, int()> ); | |
30 | ||
31 | struct A { A(int) { } }; | |
32 | static_assert( std::common_reference_with<A, int> ); | |
33 | ||
34 | struct B { }; | |
35 | static_assert( ! std::common_reference_with<A, B> ); | |
36 | ||
37 | struct C { C(A&) { } }; | |
38 | static_assert( std::common_reference_with<A&, C> ); | |
39 | static_assert( std::common_reference_with<A&, C&&> ); | |
40 | static_assert( std::common_reference_with<A&, const C&> ); | |
41 | static_assert( std::common_reference_with<A&, C&> ); | |
42 | static_assert( ! std::common_reference_with<const A&, C> ); | |
43 | static_assert( ! std::common_reference_with<const A&, const C&> ); | |
44 | ||
45 | struct D; | |
46 | struct E { E(D&) { } }; | |
47 | struct D { D(E&) { } }; | |
48 | static_assert( ! std::common_reference_with<D&, E&> ); // ambiguous conversion | |
49 | ||
50 | struct F; | |
51 | struct G { G(const F&) { } }; | |
52 | struct F { F(const G&) { } }; | |
53 | namespace std | |
54 | { | |
55 | template<template<typename> class Qual1, template<typename> class Qual2> | |
56 | struct basic_common_reference<F, G, Qual1, Qual2> | |
57 | { using type = Qual1<Qual2<F>>; }; | |
58 | template<template<typename> class Qual1, template<typename> class Qual2> | |
59 | struct basic_common_reference<G, F, Qual1, Qual2> | |
60 | { using type = Qual1<Qual2<F>>; }; | |
61 | } | |
62 | ||
63 | static_assert( ! std::common_reference_with<F&, G&> ); | |
64 | static_assert( std::common_reference_with<F, G> ); | |
65 | static_assert( std::common_reference_with<F, const G> ); | |
66 | static_assert( std::common_reference_with<const F, const G> ); | |
67 | ||
68 | struct Base { }; | |
69 | struct Derived : Base { }; | |
70 | static_assert( std::common_reference_with<Derived&, Base&> ); | |
71 | static_assert( std::common_with<Derived*, Base*> ); |