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83ffe9cd | 1 | // Copyright (C) 2019-2023 Free Software Foundation, Inc. |
6d0dff49 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 run { target c++2a } } | |
20 | ||
21 | #include <iterator> | |
22 | #include <testsuite_hooks.h> | |
23 | #include <testsuite_iterators.h> | |
24 | ||
25 | using __gnu_test::test_range; | |
26 | using __gnu_test::random_access_iterator_wrapper; | |
27 | using __gnu_test::bidirectional_iterator_wrapper; | |
28 | using __gnu_test::forward_iterator_wrapper; | |
29 | using __gnu_test::input_iterator_wrapper; | |
30 | using __gnu_test::output_iterator_wrapper; | |
31 | ||
32 | void | |
33 | test01() | |
34 | { | |
35 | int a[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; | |
36 | test_range<int, random_access_iterator_wrapper> r(a); | |
37 | auto begin = r.begin(); | |
38 | auto end = r.end(); | |
6e5a1963 PP |
39 | auto endi = std::ranges::next(begin, end); |
40 | VERIFY( *std::ranges::prev(endi) == 9 ); | |
6d0dff49 | 41 | VERIFY( std::ranges::prev(begin, 0) == begin ); |
6e5a1963 PP |
42 | VERIFY( *std::ranges::prev(endi, 1) == 9 ); |
43 | VERIFY( *std::ranges::prev(endi, 3) == 7 ); | |
6d0dff49 JW |
44 | VERIFY( *std::ranges::prev(begin, -4) == 4 ); |
45 | VERIFY( std::ranges::prev(begin, 0, begin) == begin ); | |
46 | VERIFY( std::ranges::prev(begin, 5, begin) == begin ); | |
47 | VERIFY( std::ranges::prev(begin, -5, begin) == begin ); | |
6e5a1963 PP |
48 | VERIFY( std::ranges::prev(begin, 0, endi) == begin ); |
49 | VERIFY( *std::ranges::prev(endi, 5, begin) == 5 ); | |
50 | VERIFY( std::ranges::prev(endi, 55, begin) == begin ); | |
51 | VERIFY( std::ranges::prev(endi, 0, endi) == end ); | |
52 | VERIFY( std::ranges::prev(endi, -5, endi) == end ); | |
53 | VERIFY( std::ranges::prev(endi, -55, endi) == end ); | |
54 | VERIFY( std::ranges::prev(endi, 0, begin) == end ); | |
55 | VERIFY( *std::ranges::prev(begin, -5, endi) == 5 ); | |
56 | VERIFY( std::ranges::prev(begin, -55, endi) == end ); | |
6d0dff49 JW |
57 | } |
58 | ||
59 | void | |
60 | test02() | |
61 | { | |
62 | int a[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; | |
63 | test_range<int, bidirectional_iterator_wrapper> r(a); | |
64 | auto begin = r.begin(); | |
65 | auto end = r.end(); | |
6e5a1963 PP |
66 | auto endi = std::ranges::next(begin, end); |
67 | VERIFY( *std::ranges::prev(endi) == 9 ); | |
6d0dff49 | 68 | VERIFY( std::ranges::prev(begin, 0) == begin ); |
6e5a1963 PP |
69 | VERIFY( *std::ranges::prev(endi, 1) == 9 ); |
70 | VERIFY( *std::ranges::prev(endi, 3) == 7 ); | |
6d0dff49 JW |
71 | VERIFY( *std::ranges::prev(begin, -4) == 4 ); |
72 | VERIFY( std::ranges::prev(begin, 0, begin) == begin ); | |
73 | VERIFY( std::ranges::prev(begin, 5, begin) == begin ); | |
74 | VERIFY( std::ranges::prev(begin, -5, begin) == begin ); | |
6e5a1963 PP |
75 | VERIFY( std::ranges::prev(begin, 0, endi) == begin ); |
76 | VERIFY( *std::ranges::prev(endi, 5, begin) == 5 ); | |
77 | VERIFY( std::ranges::prev(endi, 55, begin) == begin ); | |
78 | VERIFY( std::ranges::prev(endi, 0, endi) == end ); | |
79 | VERIFY( std::ranges::prev(endi, -5, endi) == end ); | |
80 | VERIFY( std::ranges::prev(endi, -55, endi) == end ); | |
81 | VERIFY( std::ranges::prev(endi, 0, begin) == end ); | |
82 | VERIFY( *std::ranges::prev(begin, -5, endi) == 5 ); | |
83 | VERIFY( std::ranges::prev(begin, -55, endi) == end ); | |
6d0dff49 JW |
84 | } |
85 | ||
86 | template<typename T> | |
87 | concept can_prev = requires(T& t) { std::ranges::prev(t); } | |
88 | || requires(T& t) { std::ranges::prev(t, 1); } | |
89 | || requires(T& t) { std::ranges::prev(t, 1, t); }; | |
90 | ||
91 | static_assert( !can_prev<forward_iterator_wrapper<int>> ); | |
92 | static_assert( !can_prev<input_iterator_wrapper<int>> ); | |
93 | static_assert( !can_prev<output_iterator_wrapper<int>> ); | |
94 | ||
95 | int | |
96 | main() | |
97 | { | |
98 | test01(); | |
99 | test02(); | |
100 | } |