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
test()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
main(int,char **)76 int main(int, char**) {
77 test();
78 static_assert(test());
79
80 return 0;
81 }
82