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