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 auto end() requires (!simple-view<V>)
14 // constexpr auto end() const requires range<const V>
15 
16 #include <ranges>
17 #include <cassert>
18 
19 #include "test_macros.h"
20 #include "test_iterators.h"
21 #include "test_range.h"
22 #include "types.h"
23 
24 constexpr bool test() {
25   int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
26 
27   // sized_range && random_access_iterator
28   {
29     std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 0);
30     assert(tv.end() == std::ranges::next(tv.begin(), 0));
31     ASSERT_SAME_TYPE(decltype(tv.end()), RandomAccessIter);
32   }
33 
34   {
35     const std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 1);
36     assert(tv.end() == std::ranges::next(tv.begin(), 1));
37     ASSERT_SAME_TYPE(decltype(tv.end()), RandomAccessIter);
38   }
39 
40   // sized_range && !random_access_iterator
41   {
42     std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 2);
43     assert(tv.end() == std::ranges::next(tv.begin(), 2));
44     ASSERT_SAME_TYPE(decltype(tv.end()), std::default_sentinel_t);
45   }
46 
47   {
48     const std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 3);
49     assert(tv.end() == std::ranges::next(tv.begin(), 3));
50     ASSERT_SAME_TYPE(decltype(tv.end()), std::default_sentinel_t);
51   }
52 
53   // !sized_range
54   {
55     std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 4);
56     assert(tv.end() == std::ranges::next(tv.begin(), 4));
57 
58     // The <sentinel> type.
59     static_assert(!std::same_as<decltype(tv.end()), std::default_sentinel_t>);
60     static_assert(!std::same_as<decltype(tv.end()), int*>);
61   }
62 
63   {
64     const std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 5);
65     assert(tv.end() == std::ranges::next(tv.begin(), 5));
66   }
67 
68   // Just to cover the case where count == 8.
69   {
70     std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 8);
71     assert(tv.end() == std::ranges::next(tv.begin(), 8));
72   }
73 
74   return true;
75 }
76 
77 int main(int, char**) {
78   test();
79   static_assert(test());
80 
81   return 0;
82 }
83