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: libcpp-has-no-incomplete-ranges
12 
13 // constexpr explicit reverse_view(V r);
14 
15 #include <ranges>
16 
17 #include <cassert>
18 #include <type_traits>
19 #include <utility>
20 
21 #include "types.h"
22 
23 constexpr bool test() {
24   int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
25 
26   {
27     BidirRange r{buffer, buffer + 8};
28     std::ranges::reverse_view<BidirRange> rev(r);
29     assert(rev.base().begin_ == buffer);
30     assert(rev.base().end_ == buffer + 8);
31   }
32   {
33     const BidirRange r{buffer, buffer + 8};
34     const std::ranges::reverse_view<BidirRange> rev(r);
35     assert(rev.base().begin_ == buffer);
36     assert(rev.base().end_ == buffer + 8);
37   }
38   {
39     std::ranges::reverse_view<BidirSentRange<MoveOnly>> rev(BidirSentRange<MoveOnly>{buffer, buffer + 8});
40     auto moved = std::move(rev).base();
41     assert(moved.begin_ == buffer);
42     assert(moved.end_ == buffer + 8);
43   }
44   {
45     const std::ranges::reverse_view<BidirSentRange<Copyable>> rev(BidirSentRange<Copyable>{buffer, buffer + 8});
46     assert(rev.base().begin_ == buffer);
47     assert(rev.base().end_ == buffer + 8);
48   }
49   {
50     // Make sure this ctor is marked as "explicit".
51     static_assert( std::is_constructible_v<std::ranges::reverse_view<BidirRange>, BidirRange>);
52     static_assert(!std::is_convertible_v<std::ranges::reverse_view<BidirRange>, BidirRange>);
53   }
54 
55   return true;
56 }
57 
58 int main(int, char**) {
59   test();
60   static_assert(test());
61 
62   return 0;
63 }
64