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