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
11 // constexpr auto end() requires (!simple-view<V>)
12 // constexpr auto end() const requires range<const V>
13
14 #include <ranges>
15 #include <cassert>
16
17 #include "test_macros.h"
18 #include "test_iterators.h"
19 #include "test_range.h"
20 #include "types.h"
21
test()22 constexpr bool test() {
23 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
24
25 // sized_range && random_access_iterator
26 {
27 std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 0);
28 assert(tv.end() == std::ranges::next(tv.begin(), 0));
29 ASSERT_SAME_TYPE(decltype(tv.end()), RandomAccessIter);
30 }
31
32 {
33 const std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 1);
34 assert(tv.end() == std::ranges::next(tv.begin(), 1));
35 ASSERT_SAME_TYPE(decltype(tv.end()), RandomAccessIter);
36 }
37
38 // sized_range && !random_access_iterator
39 {
40 std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 2);
41 assert(tv.end() == std::ranges::next(tv.begin(), 2));
42 ASSERT_SAME_TYPE(decltype(tv.end()), std::default_sentinel_t);
43 }
44
45 {
46 const std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 3);
47 assert(tv.end() == std::ranges::next(tv.begin(), 3));
48 ASSERT_SAME_TYPE(decltype(tv.end()), std::default_sentinel_t);
49 }
50
51 // !sized_range
52 {
53 std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 4);
54 assert(tv.end() == std::ranges::next(tv.begin(), 4));
55
56 // The <sentinel> type.
57 static_assert(!std::same_as<decltype(tv.end()), std::default_sentinel_t>);
58 static_assert(!std::same_as<decltype(tv.end()), int*>);
59 }
60
61 {
62 const std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 5);
63 assert(tv.end() == std::ranges::next(tv.begin(), 5));
64 }
65
66 // Just to cover the case where count == 8.
67 {
68 std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 8);
69 assert(tv.end() == std::ranges::next(tv.begin(), 8));
70 }
71
72 {
73 // __iterator<false> has base with type std::ranges::sentinel_t<NonSimpleViewNonSized>; adding a const qualifier
74 // would change the equality.
75 std::ranges::take_view<NonSimpleNonSizedView> tvns(NonSimpleNonSizedView{buffer, buffer + 8}, 0);
76 static_assert(!std::is_same_v<decltype(tvns.end().base()), std::ranges::sentinel_t<const NonSimpleNonSizedView>>);
77 }
78
79 {
80 // __iterator<true> has base with type std::ranges::sentinel_t<const NonSimpleViewNonSized>; adding a const qualifier
81 // would not change the equality.
82 std::ranges::take_view<SimpleViewNonSized> tvs(SimpleViewNonSized{buffer, buffer + 8}, 0);
83 static_assert(std::is_same_v<decltype(tvs.end().base()), std::ranges::sentinel_t<const SimpleViewNonSized>>);
84 }
85
86 return true;
87 }
88
main(int,char **)89 int main(int, char**) {
90 test();
91 static_assert(test());
92
93 return 0;
94 }
95