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a945c346 | 1 | // Copyright (C) 2019-2024 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 | ||
d4ac20b0 | 18 | // { dg-do compile { target c++20 } } |
cfc219ae JW |
19 | |
20 | #include <concepts> | |
21 | ||
22 | static_assert( std::same_as<int, int> ); | |
23 | static_assert( !std::same_as<int&, int> ); | |
24 | static_assert( !std::same_as<int, int&> ); | |
25 | static_assert( !std::same_as<int&&, int&> ); | |
26 | static_assert( !std::same_as<const int, int> ); | |
27 | static_assert( std::same_as<const int, const int> ); | |
28 | ||
29 | struct A { }; | |
30 | static_assert( std::same_as<A, A> ); | |
31 | static_assert( !std::same_as<A, const A> ); | |
32 | static_assert( std::same_as<A const, const A> ); | |
33 | static_assert( !std::same_as<volatile A, const A> ); | |
34 | ||
35 | struct B : A { }; | |
36 | static_assert( !std::same_as<A, B> ); | |
37 | ||
38 | template<typename T, typename U> | |
39 | constexpr int | |
40 | check_subsumption() | |
41 | { return 0; } | |
42 | ||
43 | template<typename T, typename U> | |
44 | requires std::same_as<T, U> | |
45 | constexpr int | |
46 | check_subsumption() | |
47 | { return 1; } | |
48 | ||
49 | template<typename T, typename U> | |
50 | requires std::same_as<U, T> && std::is_const_v<T> | |
51 | constexpr int | |
52 | check_subsumption() | |
53 | { return 2; } | |
54 | ||
55 | template<typename T, typename U> | |
56 | requires std::same_as<U, T> && std::is_volatile_v<T> | |
57 | constexpr int | |
58 | check_subsumption() | |
59 | { return 3; } | |
60 | ||
61 | static_assert( check_subsumption<short, long>() == 0 ); | |
62 | static_assert( check_subsumption<unsigned, unsigned>() == 1 ); | |
63 | // These will be ambiguous if same_as<T,U> doesn't subsume same_as<U,T>: | |
64 | static_assert( check_subsumption<const char, const char>() == 2 ); | |
65 | static_assert( check_subsumption<volatile int, volatile int>() == 3 ); |