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83ffe9cd | 1 | // Copyright (C) 2020-2023 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 | ||
762baaf0 | 18 | // { dg-do run { target c++20 } } |
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19 | |
20 | #include <iterator> | |
21 | #include <testsuite_hooks.h> | |
22 | ||
23 | struct value { int n; }; | |
24 | ||
25 | struct sentinel { int limit; }; | |
26 | ||
27 | struct iterator | |
28 | { | |
29 | using iterator_category = std::input_iterator_tag; | |
30 | using value_type = value; | |
31 | using difference_type = std::ptrdiff_t; | |
32 | using reference = value; | |
33 | ||
11d3e8f4 | 34 | constexpr value operator*() const { return value{counter}; } |
3bf5e765 | 35 | |
11d3e8f4 | 36 | constexpr iterator& operator++() { ++counter; return *this; } |
3bf5e765 | 37 | |
11d3e8f4 | 38 | constexpr iterator operator++(int) { auto i = *this; ++counter; return i; } |
3bf5e765 | 39 | |
11d3e8f4 | 40 | constexpr bool operator==(sentinel s) const { return counter == s.limit; } |
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41 | |
42 | int counter = 0; | |
43 | }; | |
44 | ||
11d3e8f4 | 45 | constexpr bool |
3bf5e765 PP |
46 | test01() |
47 | { | |
48 | iterator i; | |
49 | sentinel s{2}; | |
50 | std::common_iterator<iterator, sentinel> begin = i, end = s; | |
51 | VERIFY( begin->n == 0 ); | |
52 | ++begin; | |
53 | VERIFY( begin->n == 1 ); | |
54 | ++begin; | |
55 | VERIFY( begin == end ); | |
11d3e8f4 JW |
56 | |
57 | return true; | |
3bf5e765 PP |
58 | } |
59 | ||
60 | int | |
61 | main() | |
62 | { | |
11d3e8f4 | 63 | constexpr bool b1 = test01(); |
3bf5e765 | 64 | } |