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 
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 
57 int main(int, char**) {
58   test();
59   static_assert(test());
60 
61   return 0;
62 }
63