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
11 // template<class R, class F>
12 // transform_view(R&&, F) -> transform_view<views::all_t<R>, F>;
13
14 #include <cassert>
15 #include <concepts>
16 #include <ranges>
17 #include <utility>
18
19 struct PlusOne {
20 int operator()(int x) const;
21 };
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
testCTAD()40 void testCTAD() {
41 View v;
42 Range r;
43 BorrowedRange br;
44 PlusOne f;
45
46 static_assert(std::same_as<
47 decltype(std::ranges::transform_view(v, f)),
48 std::ranges::transform_view<View, PlusOne>
49 >);
50 static_assert(std::same_as<
51 decltype(std::ranges::transform_view(std::move(v), f)),
52 std::ranges::transform_view<View, PlusOne>
53 >);
54 static_assert(std::same_as<
55 decltype(std::ranges::transform_view(r, f)),
56 std::ranges::transform_view<std::ranges::ref_view<Range>, PlusOne>
57 >);
58 static_assert(std::same_as<
59 decltype(std::ranges::transform_view(std::move(r), f)),
60 std::ranges::transform_view<std::ranges::owning_view<Range>, PlusOne>
61 >);
62 static_assert(std::same_as<
63 decltype(std::ranges::transform_view(br, f)),
64 std::ranges::transform_view<std::ranges::ref_view<BorrowedRange>, PlusOne>
65 >);
66 static_assert(std::same_as<
67 decltype(std::ranges::transform_view(std::move(br), f)),
68 std::ranges::transform_view<std::ranges::owning_view<BorrowedRange>, PlusOne>
69 >);
70 }
71