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// constexpr V base() const& requires copy_constructible<V>;
12// constexpr V base() &&;
13
14#include <ranges>
15
16#include <cassert>
17#include <utility>
18
19#include "test_macros.h"
20#include "types.h"
21
22constexpr bool hasLValueQualifiedBase(auto&& view) {
23 return requires { view.base(); };
24}
25
26constexpr bool test() {
27 int buf[8] = {1, 2, 3, 4, 5, 6, 7, 8};
28
29 {
30 CopyableView view{buf, buf + 8};
31 std::ranges::common_view<CopyableView> common(view);
32 assert(common.base().begin_ == buf);
33 assert(std::move(common).base().begin_ == buf);
34
35 ASSERT_SAME_TYPE(decltype(common.base()), CopyableView);
36 ASSERT_SAME_TYPE(decltype(std::move(common).base()), CopyableView);
37 static_assert(hasLValueQualifiedBase(common));
38 }
39
40 {
41 MoveOnlyView view{buf, buf + 8};
42 std::ranges::common_view<MoveOnlyView> common(std::move(view));
43 assert(std::move(common).base().begin_ == buf);
44
45 ASSERT_SAME_TYPE(decltype(std::move(common).base()), MoveOnlyView);
46 static_assert(!hasLValueQualifiedBase(common));
47 }
48
49 {
50 CopyableView view{buf, buf + 8};
51 const std::ranges::common_view<CopyableView> common(view);
52 assert(common.base().begin_ == buf);
53 assert(std::move(common).base().begin_ == buf);
54
55 ASSERT_SAME_TYPE(decltype(common.base()), CopyableView);
56 ASSERT_SAME_TYPE(decltype(std::move(common).base()), CopyableView);
57 static_assert(hasLValueQualifiedBase(common));
58 }
59
60 return true;
61}
62
63int main(int, char**) {
64 test();
65 static_assert(test());
66
67 return 0;
68}
69

source code of libcxx/test/std/ranges/range.adaptors/range.common.view/base.pass.cpp