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>
12 // take_view(R&&, range_difference_t<R>) -> take_view<views::all_t<R>>;
13
14 #include <cassert>
15 #include <concepts>
16 #include <ranges>
17 #include <utility>
18
19 struct View : std::ranges::view_base {
20 int *begin() const;
21 int *end() const;
22 };
23
24 struct Range {
25 int *begin() const;
26 int *end() const;
27 };
28
29 struct BorrowedRange {
30 int *begin() const;
31 int *end() const;
32 };
33 template<>
34 inline constexpr bool std::ranges::enable_borrowed_range<BorrowedRange> = true;
35
testCTAD()36 void testCTAD() {
37 View v;
38 Range r;
39 BorrowedRange br;
40
41 static_assert(std::same_as<
42 decltype(std::ranges::take_view(v, 0)),
43 std::ranges::take_view<View>
44 >);
45 static_assert(std::same_as<
46 decltype(std::ranges::take_view(std::move(v), 0)),
47 std::ranges::take_view<View>
48 >);
49 static_assert(std::same_as<
50 decltype(std::ranges::take_view(r, 0)),
51 std::ranges::take_view<std::ranges::ref_view<Range>>
52 >);
53 static_assert(std::same_as<
54 decltype(std::ranges::take_view(std::move(r), 0)),
55 std::ranges::take_view<std::ranges::owning_view<Range>>
56 >);
57 static_assert(std::same_as<
58 decltype(std::ranges::take_view(br, 0)),
59 std::ranges::take_view<std::ranges::ref_view<BorrowedRange>>
60 >);
61 static_assert(std::same_as<
62 decltype(std::ranges::take_view(std::move(br), 0)),
63 std::ranges::take_view<std::ranges::owning_view<BorrowedRange>>
64 >);
65 }
66