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
19struct View : std::ranges::view_base {
20 int *begin() const;
21 int *end() const;
22};
23
24struct Range {
25 int *begin() const;
26 int *end() const;
27};
28
29struct BorrowedRange {
30 int *begin() const;
31 int *end() const;
32};
33template<>
34inline constexpr bool std::ranges::enable_borrowed_range<BorrowedRange> = true;
35
36void 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

source code of libcxx/test/std/ranges/range.adaptors/range.take/ctad.compile.pass.cpp