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 // explicit join_view(R&&) -> join_view<views::all_t<R>>;
14
15 #include <ranges>
16 #include <utility>
17
18 struct Child {
19 int *begin() const;
20 int *end() const;
21 };
22
23 struct View : std::ranges::view_base {
24 Child *begin() const;
25 Child *end() const;
26 };
27
28 struct Range {
29 Child *begin() const;
30 Child *end() const;
31 };
32
33 struct BorrowedRange {
34 Child *begin() const;
35 Child *end() const;
36 };
37 template<>
38 inline constexpr bool std::ranges::enable_borrowed_range<BorrowedRange> = true;
39
40 struct NestedChildren : std::ranges::view_base {
41 View* begin() const;
42 View* end() const;
43 };
44
testCTAD()45 void testCTAD() {
46 View v;
47 Range r;
48 BorrowedRange br;
49
50 static_assert(std::same_as<
51 decltype(std::ranges::join_view(v)),
52 std::ranges::join_view<View>
53 >);
54 static_assert(std::same_as<
55 decltype(std::ranges::join_view(std::move(v))),
56 std::ranges::join_view<View>
57 >);
58 static_assert(std::same_as<
59 decltype(std::ranges::join_view(r)),
60 std::ranges::join_view<std::ranges::ref_view<Range>>
61 >);
62 static_assert(std::same_as<
63 decltype(std::ranges::join_view(std::move(r))),
64 std::ranges::join_view<std::ranges::owning_view<Range>>
65 >);
66 static_assert(std::same_as<
67 decltype(std::ranges::join_view(br)),
68 std::ranges::join_view<std::ranges::ref_view<BorrowedRange>>
69 >);
70 static_assert(std::same_as<
71 decltype(std::ranges::join_view(std::move(br))),
72 std::ranges::join_view<std::ranges::owning_view<BorrowedRange>>
73 >);
74
75 NestedChildren n;
76 std::ranges::join_view jv(n);
77
78 // CTAD generated from the copy constructor instead of joining the join_view
79 static_assert(std::same_as< decltype(std::ranges::join_view(jv)), decltype(jv) >);
80
81 // CTAD generated from the move constructor instead of joining the join_view
82 static_assert(std::same_as< decltype(std::ranges::join_view(std::move(jv))), decltype(jv) >);
83 }
84