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 // template<class R>
14 //   reverse_view(R&&) -> reverse_view<views::all_t<R>>;
15 
16 #include <ranges>
17 
18 #include <concepts>
19 #include <utility>
20 
21 #include "test_iterators.h"
22 
23 struct View : std::ranges::view_base {
24   int *begin() const;
25   int *end() const;
26 };
27 
28 struct Range {
29   int *begin() const;
30   int *end() const;
31 };
32 
33 struct BorrowedRange {
34   int *begin() const;
35   int *end() const;
36 };
37 template<>
38 inline constexpr bool std::ranges::enable_borrowed_range<BorrowedRange> = true;
39 
40 void testCTAD() {
41     View v;
42     Range r;
43     BorrowedRange br;
44 
45     static_assert(std::same_as<
46         decltype(std::ranges::reverse_view(v)),
47         std::ranges::reverse_view<View>
48     >);
49     static_assert(std::same_as<
50         decltype(std::ranges::reverse_view(std::move(v))),
51         std::ranges::reverse_view<View>
52     >);
53     static_assert(std::same_as<
54         decltype(std::ranges::reverse_view(r)),
55         std::ranges::reverse_view<std::ranges::ref_view<Range>>
56     >);
57     static_assert(std::same_as<
58         decltype(std::ranges::reverse_view(std::move(r))),
59         std::ranges::reverse_view<std::ranges::owning_view<Range>>
60     >);
61     static_assert(std::same_as<
62         decltype(std::ranges::reverse_view(br)),
63         std::ranges::reverse_view<std::ranges::ref_view<BorrowedRange>>
64     >);
65     static_assert(std::same_as<
66         decltype(std::ranges::reverse_view(std::move(br))),
67         std::ranges::reverse_view<std::ranges::owning_view<BorrowedRange>>
68     >);
69 }
70