1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03, c++11, c++14, c++17
10
11 // friend constexpr bool operator==(const iterator& x, const iterator& y);
12
13 #include <algorithm>
14 #include <cassert>
15 #include <concepts>
16 #include <ranges>
17
18 #include "test_iterators.h"
19
20 template <class Iter>
testOne()21 constexpr void testOne() {
22 using Range = std::ranges::subrange<Iter>;
23 using SplitView = std::ranges::split_view<Range, std::ranges::single_view<int>>;
24 static_assert(std::ranges::common_range<SplitView>);
25
26 {
27 // simple test
28 {
29 int buffer[] = {0, 1, 2, -1, 4, 5, 6};
30 Range input(Iter{buffer}, Iter{buffer + 7});
31 SplitView sv(input, -1);
32 auto b = sv.begin(), e = sv.end();
33
34 assert(b == b);
35 assert(!(b != b));
36
37 assert(e == e);
38 assert(!(e != e));
39
40 assert(!(b == e));
41 assert(b != e);
42
43 std::advance(b, 2);
44 assert(b == b);
45 assert(!(b != b));
46
47 assert(e == e);
48 assert(!(e != e));
49
50 assert(b == e);
51 assert(!(b != e));
52 }
53
54 // iterator at trailing empty position should not equal to end
55 {
56 int buffer[] = {0, 1, 2, -1};
57 Range input(Iter{buffer}, Iter{buffer + 4});
58 SplitView sv(input, -1);
59 auto b = sv.begin(), e = sv.end();
60
61 ++b; // cur points to end but trailing_empty is true
62
63 assert(b != e);
64 assert(!(b == e));
65
66 ++b;
67 assert(b == e);
68 assert(!(b != e));
69 }
70
71 // Default-constructed iterators compare equal.
72 {
73 int buffer[] = {0, 1, 2, -1, 4, 5, 6};
74 Range input(Iter{buffer}, Iter{buffer + 7});
75 std::ranges::split_view sv(buffer, -1);
76 using SplitIter = decltype(sv.begin());
77 SplitIter i1, i2;
78 assert(i1 == i2);
79 assert(!(i1 != i2));
80 }
81 }
82 }
83
test()84 constexpr bool test() {
85 testOne<forward_iterator<int*>>();
86 testOne<bidirectional_iterator<int*>>();
87 testOne<random_access_iterator<int*>>();
88 testOne<contiguous_iterator<int*>>();
89 testOne<int*>();
90
91 return true;
92 }
93
main(int,char **)94 int main(int, char**) {
95 test();
96 static_assert(test());
97
98 return 0;
99 }
100