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-no-concepts
11 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
12 
13 // constexpr reverse_iterator<iterator_t<V>> end();
14 // constexpr auto end() const requires common_range<const V>;
15 
16 #include <ranges>
17 
18 #include <cassert>
19 #include <utility>
20 
21 #include "test_macros.h"
22 #include "types.h"
23 
24 constexpr bool test() {
25   int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
26 
27   // Common bidirectional range.
28   {
29     auto rev = std::ranges::reverse_view(BidirRange{buffer, buffer + 8});
30     assert(rev.end().base().base() == buffer);
31     assert(std::move(rev).end().base().base() == buffer);
32 
33     ASSERT_SAME_TYPE(decltype(rev.end()), std::reverse_iterator<bidirectional_iterator<int*>>);
34     ASSERT_SAME_TYPE(decltype(std::move(rev).end()), std::reverse_iterator<bidirectional_iterator<int*>>);
35   }
36   // Const common bidirectional range.
37   {
38     const auto rev = std::ranges::reverse_view(BidirRange{buffer, buffer + 8});
39     assert(rev.end().base().base() == buffer);
40     assert(std::move(rev).end().base().base() == buffer);
41 
42     ASSERT_SAME_TYPE(decltype(rev.end()), std::reverse_iterator<bidirectional_iterator<const int*>>);
43     ASSERT_SAME_TYPE(decltype(std::move(rev).end()), std::reverse_iterator<bidirectional_iterator<const int*>>);
44   }
45   // Non-common, non-const (move only) bidirectional range.
46   {
47     auto rev = std::ranges::reverse_view(BidirSentRange<MoveOnly>{buffer, buffer + 8});
48     assert(std::move(rev).end().base().base() == buffer);
49 
50     ASSERT_SAME_TYPE(decltype(std::move(rev).end()), std::reverse_iterator<bidirectional_iterator<int*>>);
51   }
52   // Non-common, const bidirectional range.
53   {
54     auto rev = std::ranges::reverse_view(BidirSentRange<Copyable>{buffer, buffer + 8});
55     assert(rev.end().base().base() == buffer);
56     assert(std::move(rev).end().base().base() == buffer);
57 
58     ASSERT_SAME_TYPE(decltype(rev.end()), std::reverse_iterator<bidirectional_iterator<int*>>);
59     ASSERT_SAME_TYPE(decltype(std::move(rev).end()), std::reverse_iterator<bidirectional_iterator<int*>>);
60   }
61 
62   return true;
63 }
64 
65 int main(int, char**) {
66   test();
67   static_assert(test());
68 
69   return 0;
70 }
71