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a945c346 | 1 | // Copyright (C) 2020-2024 Free Software Foundation, Inc. |
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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 } } |
5713834e JW |
19 | |
20 | #include <ranges> | |
21 | ||
22 | auto i = std::ranges::iota_view<int>{}.begin(); | |
23 | static_assert( std::three_way_comparable<decltype(i)> ); | |
24 | ||
25 | struct Inc { | |
26 | Inc& operator++(); | |
27 | Inc operator++(int); | |
28 | friend long operator-(Inc, Inc); | |
29 | }; | |
30 | static_assert( ! std::three_way_comparable<Inc> ); | |
31 | ||
32 | // Instantiating iterator type must be valid despite !three_way_comparable<Inc> | |
33 | auto j = std::ranges::iota_view<Inc>{}.begin(); | |
34 | static_assert( ! std::three_way_comparable<decltype(j)> ); |