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52066eae | 1 | // { dg-do compile { target c++11 } } |
75e75a08 | 2 | |
99dee823 | 3 | // Copyright (C) 2014-2021 Free Software Foundation, Inc. |
75e75a08 JW |
4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
8 | // Free Software Foundation; either version 3, or (at your option) | |
9 | // any later version. | |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
16 | // You should have received a copy of the GNU General Public License along | |
17 | // with this library; see the file COPYING3. If not see | |
18 | // <http://www.gnu.org/licenses/>. | |
19 | ||
20 | #include <tuple> | |
21 | ||
22 | // A type that is contextually convertible to bool but cannot be used with | |
23 | // the usual logical operators, and/or/not. | |
24 | struct TwistedLogic { | |
25 | bool value; | |
26 | ||
27 | explicit operator bool() const noexcept { return value; } | |
28 | }; | |
29 | ||
30 | template<typename T> | |
31 | bool operator&&(const T&, TwistedLogic) = delete; | |
32 | ||
33 | template<typename T> | |
34 | bool operator&&(TwistedLogic, const T&) = delete; | |
35 | ||
36 | template<typename T> | |
37 | bool operator||(const T&, TwistedLogic) = delete; | |
38 | ||
39 | template<typename T> | |
40 | bool operator||(TwistedLogic, const T&) = delete; | |
41 | ||
42 | bool operator!(TwistedLogic) noexcept = delete; | |
43 | ||
44 | struct Compares {}; | |
45 | ||
46 | TwistedLogic operator==(const Compares&, const Compares&) { return {true}; } | |
47 | TwistedLogic operator<(const Compares&, const Compares&) { return {false}; } | |
48 | ||
49 | auto a = std::make_tuple(nullptr, Compares{}, 2, 'U'); | |
50 | auto b = a == a; | |
51 | auto c = a < a; |