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, class F>
13 // transform_view(R&&, F) -> transform_view<views::all_t<R>, F>;
14
15 #include <cassert>
16 #include <concepts>
17 #include <ranges>
18 #include <utility>
19
20 struct PlusOne {
21 int operator()(int x) const;
22 };
23
24 struct View : std::ranges::view_base {
25 int *begin() const;
26 int *end() const;
27 };
28
29 struct Range {
30 int *begin() const;
31 int *end() const;
32 };
33
34 struct BorrowedRange {
35 int *begin() const;
36 int *end() const;
37 };
38 template<>
39 inline constexpr bool std::ranges::enable_borrowed_range<BorrowedRange> = true;
40
testCTAD()41 void testCTAD() {
42 View v;
43 Range r;
44 BorrowedRange br;
45 PlusOne f;
46
47 static_assert(std::same_as<
48 decltype(std::ranges::transform_view(v, f)),
49 std::ranges::transform_view<View, PlusOne>
50 >);
51 static_assert(std::same_as<
52 decltype(std::ranges::transform_view(std::move(v), f)),
53 std::ranges::transform_view<View, PlusOne>
54 >);
55 static_assert(std::same_as<
56 decltype(std::ranges::transform_view(r, f)),
57 std::ranges::transform_view<std::ranges::ref_view<Range>, PlusOne>
58 >);
59 static_assert(std::same_as<
60 decltype(std::ranges::transform_view(std::move(r), f)),
61 std::ranges::transform_view<std::ranges::owning_view<Range>, PlusOne>
62 >);
63 static_assert(std::same_as<
64 decltype(std::ranges::transform_view(br, f)),
65 std::ranges::transform_view<std::ranges::ref_view<BorrowedRange>, PlusOne>
66 >);
67 static_assert(std::same_as<
68 decltype(std::ranges::transform_view(std::move(br), f)),
69 std::ranges::transform_view<std::ranges::owning_view<BorrowedRange>, PlusOne>
70 >);
71 }
72