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: gcc-10
12 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
13 
14 // constexpr explicit reverse_view(V r);
15 
16 #include <ranges>
17 #include <cassert>
18 
19 #include "test_macros.h"
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};
27     std::ranges::reverse_view<BidirRange> rev(r);
28     assert(rev.base().ptr_ == buffer);
29   }
30   {
31     const BidirRange r{buffer};
32     const std::ranges::reverse_view<BidirRange> rev(r);
33     assert(rev.base().ptr_ == buffer);
34   }
35   {
36     std::ranges::reverse_view<BidirSentRange<MoveOnly>> rev(BidirSentRange<MoveOnly>{buffer});
37     assert(std::move(rev).base().ptr_ == buffer);
38   }
39   {
40     const std::ranges::reverse_view<BidirSentRange<Copyable>> rev(BidirSentRange<Copyable>{buffer});
41     assert(rev.base().ptr_ == buffer);
42   }
43   {
44     // Make sure this ctor is marked as "explicit".
45     static_assert( std::is_constructible_v<std::ranges::reverse_view<BidirRange>, BidirRange>);
46     static_assert(!std::is_convertible_v<std::ranges::reverse_view<BidirRange>, BidirRange>);
47   }
48 
49   return true;
50 }
51 
52 int main(int, char**) {
53   test();
54   static_assert(test());
55 
56   return 0;
57 }
58