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() requires (!simple-view<V>)
13 // constexpr auto end() const requires range<const V>
14 
15 #include <ranges>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 #include "test_iterators.h"
20 #include "test_range.h"
21 #include "types.h"
22 
23 constexpr bool test() {
24   int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
25 
26   // sized_range && random_access_iterator
27   {
28     std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 0);
29     assert(tv.end() == std::ranges::next(tv.begin(), 0));
30     ASSERT_SAME_TYPE(decltype(tv.end()), RandomAccessIter);
31   }
32 
33   {
34     const std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 1);
35     assert(tv.end() == std::ranges::next(tv.begin(), 1));
36     ASSERT_SAME_TYPE(decltype(tv.end()), RandomAccessIter);
37   }
38 
39   // sized_range && !random_access_iterator
40   {
41     std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 2);
42     assert(tv.end() == std::ranges::next(tv.begin(), 2));
43     ASSERT_SAME_TYPE(decltype(tv.end()), std::default_sentinel_t);
44   }
45 
46   {
47     const std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 3);
48     assert(tv.end() == std::ranges::next(tv.begin(), 3));
49     ASSERT_SAME_TYPE(decltype(tv.end()), std::default_sentinel_t);
50   }
51 
52   // !sized_range
53   {
54     std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 4);
55     assert(tv.end() == std::ranges::next(tv.begin(), 4));
56 
57     // The <sentinel> type.
58     static_assert(!std::same_as<decltype(tv.end()), std::default_sentinel_t>);
59     static_assert(!std::same_as<decltype(tv.end()), int*>);
60   }
61 
62   {
63     const std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 5);
64     assert(tv.end() == std::ranges::next(tv.begin(), 5));
65   }
66 
67   // Just to cover the case where count == 8.
68   {
69     std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 8);
70     assert(tv.end() == std::ranges::next(tv.begin(), 8));
71   }
72 
73   return true;
74 }
75 
76 int main(int, char**) {
77   test();
78   static_assert(test());
79 
80   return 0;
81 }
82