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 #include <cassert>
18 
19 #include "test_macros.h"
20 #include "types.h"
21 
22 constexpr bool test() {
23   int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
24 
25   // Common bidirectional range.
26   {
27     auto rev = std::ranges::reverse_view(BidirRange{buffer});
28     assert(rev.end().base().base() == buffer);
29     assert(std::move(rev).end().base().base() == buffer);
30 
31     ASSERT_SAME_TYPE(decltype(rev.end()), std::reverse_iterator<bidirectional_iterator<int*>>);
32     ASSERT_SAME_TYPE(decltype(std::move(rev).end()), std::reverse_iterator<bidirectional_iterator<int*>>);
33   }
34   // Const common bidirectional range.
35   {
36     const auto rev = std::ranges::reverse_view(BidirRange{buffer});
37     assert(rev.end().base().base() == buffer);
38     assert(std::move(rev).end().base().base() == buffer);
39 
40     ASSERT_SAME_TYPE(decltype(rev.end()), std::reverse_iterator<bidirectional_iterator<const int*>>);
41     ASSERT_SAME_TYPE(decltype(std::move(rev).end()), std::reverse_iterator<bidirectional_iterator<const int*>>);
42   }
43   // Non-common, non-const (move only) bidirectional range.
44   {
45     auto rev = std::ranges::reverse_view(BidirSentRange<MoveOnly>{buffer});
46     assert(std::move(rev).end().base().base() == buffer);
47 
48     ASSERT_SAME_TYPE(decltype(std::move(rev).end()), std::reverse_iterator<bidirectional_iterator<int*>>);
49   }
50   // Non-common, const bidirectional range.
51   {
52     auto rev = std::ranges::reverse_view(BidirSentRange<Copyable>{buffer});
53     assert(rev.end().base().base() == buffer);
54     assert(std::move(rev).end().base().base() == buffer);
55 
56     ASSERT_SAME_TYPE(decltype(rev.end()), std::reverse_iterator<bidirectional_iterator<int*>>);
57     ASSERT_SAME_TYPE(decltype(std::move(rev).end()), std::reverse_iterator<bidirectional_iterator<int*>>);
58   }
59 
60   return true;
61 }
62 
63 int main(int, char**) {
64   test();
65   static_assert(test());
66 
67   return 0;
68 }
69