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