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: gcc-10
12 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
13 
14 // constexpr auto end() requires (!simple-view<V>)
15 // constexpr auto end() const requires range<const V>
16 
17 #include <ranges>
18 #include <cassert>
19 
20 #include "test_macros.h"
21 #include "test_iterators.h"
22 #include "test_range.h"
23 #include "types.h"
24 
25 constexpr bool test() {
26   int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
27 
28   // sized_range && random_access_iterator
29   {
30     std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 0);
31     assert(tv.end() == std::ranges::next(tv.begin(), 0));
32     ASSERT_SAME_TYPE(decltype(tv.end()), RandomAccessIter);
33   }
34 
35   {
36     const std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 1);
37     assert(tv.end() == std::ranges::next(tv.begin(), 1));
38     ASSERT_SAME_TYPE(decltype(tv.end()), RandomAccessIter);
39   }
40 
41   // sized_range && !random_access_iterator
42   {
43     std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 2);
44     assert(tv.end() == std::ranges::next(tv.begin(), 2));
45     ASSERT_SAME_TYPE(decltype(tv.end()), std::default_sentinel_t);
46   }
47 
48   {
49     const std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 3);
50     assert(tv.end() == std::ranges::next(tv.begin(), 3));
51     ASSERT_SAME_TYPE(decltype(tv.end()), std::default_sentinel_t);
52   }
53 
54   // !sized_range
55   {
56     std::ranges::take_view<ContiguousView> tv(ContiguousView{buffer}, 4);
57     assert(tv.end() == std::ranges::next(tv.begin(), 4));
58 
59     // The <sentinel> type.
60     static_assert(!std::same_as<decltype(tv.end()), std::default_sentinel_t>);
61     static_assert(!std::same_as<decltype(tv.end()), int*>);
62   }
63 
64   {
65     const std::ranges::take_view<ContiguousView> tv(ContiguousView{buffer}, 5);
66     assert(tv.end() == std::ranges::next(tv.begin(), 5));
67   }
68 
69   // Just to cover the case where count == 8.
70   {
71     std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 8);
72     assert(tv.end() == std::ranges::next(tv.begin(), 8));
73   }
74 
75   return true;
76 }
77 
78 int main(int, char**) {
79   test();
80   static_assert(test());
81 
82   return 0;
83 }
84