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 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
11
12 // constexpr V base() const& requires copy_constructible<V>;
13 // constexpr V base() &&;
14
15 #include <ranges>
16 #include <cassert>
17
18 #include "test_macros.h"
19 #include "test_iterators.h"
20 #include "types.h"
21
hasLValueQualifiedBase(auto && view)22 constexpr bool hasLValueQualifiedBase(auto&& view) {
23 return requires { view.base(); };
24 }
25
test()26 constexpr bool test() {
27 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
28
29 {
30 std::ranges::take_view<CopyableView> tv(CopyableView{buffer}, 0);
31 assert(tv.base().ptr_ == buffer);
32 assert(std::move(tv).base().ptr_ == buffer);
33
34 ASSERT_SAME_TYPE(decltype(tv.base()), CopyableView);
35 ASSERT_SAME_TYPE(decltype(std::move(tv).base()), CopyableView);
36 static_assert(hasLValueQualifiedBase(tv));
37 }
38
39 {
40 std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 1);
41 assert(std::move(tv).base().ptr_ == buffer);
42
43 ASSERT_SAME_TYPE(decltype(std::move(tv).base()), MoveOnlyView);
44 static_assert(!hasLValueQualifiedBase(tv));
45 }
46
47 {
48 const std::ranges::take_view<CopyableView> tv(CopyableView{buffer}, 2);
49 assert(tv.base().ptr_ == buffer);
50 assert(std::move(tv).base().ptr_ == buffer);
51
52 ASSERT_SAME_TYPE(decltype(tv.base()), CopyableView);
53 ASSERT_SAME_TYPE(decltype(std::move(tv).base()), CopyableView);
54 static_assert(hasLValueQualifiedBase(tv));
55 }
56
57 return true;
58 }
59
main(int,char **)60 int main(int, char**) {
61 test();
62 static_assert(test());
63
64 return 0;
65 }
66