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 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
11 
12 // constexpr reverse_iterator<iterator_t<V>> end();
13 // constexpr auto end() const requires common_range<const V>;
14 
15 #include <ranges>
16 
17 #include <cassert>
18 #include <utility>
19 
20 #include "test_macros.h"
21 #include "types.h"
22 
23 constexpr bool test() {
24   int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
25 
26   // Common bidirectional range.
27   {
28     auto rev = std::ranges::reverse_view(BidirRange{buffer, buffer + 8});
29     assert(base(rev.end().base()) == buffer);
30     assert(base(std::move(rev).end().base()) == buffer);
31 
32     ASSERT_SAME_TYPE(decltype(rev.end()), std::reverse_iterator<bidirectional_iterator<int*>>);
33     ASSERT_SAME_TYPE(decltype(std::move(rev).end()), std::reverse_iterator<bidirectional_iterator<int*>>);
34   }
35   // Const common bidirectional range.
36   {
37     const auto rev = std::ranges::reverse_view(BidirRange{buffer, buffer + 8});
38     assert(base(rev.end().base()) == buffer);
39     assert(base(std::move(rev).end().base()) == buffer);
40 
41     ASSERT_SAME_TYPE(decltype(rev.end()), std::reverse_iterator<bidirectional_iterator<const int*>>);
42     ASSERT_SAME_TYPE(decltype(std::move(rev).end()), std::reverse_iterator<bidirectional_iterator<const int*>>);
43   }
44   // Non-common, non-const (move only) bidirectional range.
45   {
46     auto rev = std::ranges::reverse_view(BidirSentRange<MoveOnly>{buffer, buffer + 8});
47     assert(base(std::move(rev).end().base()) == buffer);
48 
49     ASSERT_SAME_TYPE(decltype(std::move(rev).end()), std::reverse_iterator<bidirectional_iterator<int*>>);
50   }
51   // Non-common, const bidirectional range.
52   {
53     auto rev = std::ranges::reverse_view(BidirSentRange<Copyable>{buffer, buffer + 8});
54     assert(base(rev.end().base()) == buffer);
55     assert(base(std::move(rev).end().base()) == buffer);
56 
57     ASSERT_SAME_TYPE(decltype(rev.end()), std::reverse_iterator<bidirectional_iterator<int*>>);
58     ASSERT_SAME_TYPE(decltype(std::move(rev).end()), std::reverse_iterator<bidirectional_iterator<int*>>);
59   }
60 
61   return true;
62 }
63 
64 int main(int, char**) {
65   test();
66   static_assert(test());
67 
68   return 0;
69 }
70