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 auto end();
13 // constexpr auto end() const requires range<const V>;
14 
15 #include <ranges>
16 
17 #include <cassert>
18 #include <concepts>
19 #include <utility>
20 
21 #include "test_macros.h"
22 #include "test_iterators.h"
23 #include "types.h"
24 
25 constexpr bool test() {
26   int buf[8] = {1, 2, 3, 4, 5, 6, 7, 8};
27 
28   {
29     SizedRandomAccessView view{buf, buf + 8};
30     std::ranges::common_view<SizedRandomAccessView> common(view);
31     std::same_as<RandomAccessIter> auto end = common.end(); // Note this should NOT be the sentinel type.
32     assert(base(end) == buf + 8);
33   }
34 
35   // const version
36   {
37     SizedRandomAccessView view{buf, buf + 8};
38     std::ranges::common_view<SizedRandomAccessView> const common(view);
39     std::same_as<RandomAccessIter> auto end = common.end(); // Note this should NOT be the sentinel type.
40     assert(base(end) == buf + 8);
41   }
42 
43   return true;
44 }
45 
46 int main(int, char**) {
47   test();
48   static_assert(test());
49 
50   {
51     int buf[8] = {1, 2, 3, 4, 5, 6, 7, 8};
52 
53     using CommonForwardIter = std::common_iterator<ForwardIter, sized_sentinel<ForwardIter>>;
54     using CommonIntIter = std::common_iterator<int*, sentinel_wrapper<int*>>;
55 
56     {
57       SizedForwardView view{buf, buf + 8};
58       std::ranges::common_view<SizedForwardView> common(view);
59       std::same_as<CommonForwardIter> auto end = common.end();
60       assert(end == CommonForwardIter(std::ranges::end(view)));
61     }
62     {
63       CopyableView view{buf, buf + 8};
64       std::ranges::common_view<CopyableView> common(view);
65       std::same_as<CommonIntIter> auto end = common.end();
66       assert(end == CommonIntIter(std::ranges::end(view)));
67     }
68 
69     // const versions
70     {
71       SizedForwardView view{buf, buf + 8};
72       std::ranges::common_view<SizedForwardView> const common(view);
73       std::same_as<CommonForwardIter> auto end = common.end();
74       assert(end == CommonForwardIter(std::ranges::end(view)));
75     }
76     {
77       CopyableView view{buf, buf + 8};
78       std::ranges::common_view<CopyableView> const common(view);
79       std::same_as<CommonIntIter> auto end = common.end();
80       assert(end == CommonIntIter(std::ranges::end(view)));
81     }
82   }
83 
84   return 0;
85 }
86