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 explicit reverse_view(V r);
13
14 #include <ranges>
15
16 #include <cassert>
17 #include <type_traits>
18 #include <utility>
19
20 #include "types.h"
21
test()22 constexpr bool test() {
23 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
24
25 {
26 BidirRange r{buffer, buffer + 8};
27 std::ranges::reverse_view<BidirRange> rev(r);
28 assert(rev.base().begin_ == buffer);
29 assert(rev.base().end_ == buffer + 8);
30 }
31 {
32 const BidirRange r{buffer, buffer + 8};
33 const std::ranges::reverse_view<BidirRange> rev(r);
34 assert(rev.base().begin_ == buffer);
35 assert(rev.base().end_ == buffer + 8);
36 }
37 {
38 std::ranges::reverse_view<BidirSentRange<MoveOnly>> rev(BidirSentRange<MoveOnly>{buffer, buffer + 8});
39 auto moved = std::move(rev).base();
40 assert(moved.begin_ == buffer);
41 assert(moved.end_ == buffer + 8);
42 }
43 {
44 const std::ranges::reverse_view<BidirSentRange<Copyable>> rev(BidirSentRange<Copyable>{buffer, buffer + 8});
45 assert(rev.base().begin_ == buffer);
46 assert(rev.base().end_ == buffer + 8);
47 }
48 {
49 // Make sure this ctor is marked as "explicit".
50 static_assert( std::is_constructible_v<std::ranges::reverse_view<BidirRange>, BidirRange>);
51 static_assert(!std::is_convertible_v<std::ranges::reverse_view<BidirRange>, BidirRange>);
52 }
53
54 return true;
55 }
56
main(int,char **)57 int main(int, char**) {
58 test();
59 static_assert(test());
60
61 return 0;
62 }
63