1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// constexpr R& base() & noexcept { return r_; }
// constexpr const R& base() const& noexcept { return r_; }
// constexpr R&& base() && noexcept { return std::move(r_); }
// constexpr const R&& base() const&& noexcept { return std::move(r_); }
#include <ranges>
#include <cassert>
#include <concepts>
#include "test_macros.h"
struct Base {
int *begin() const;
int *end() const;
};
constexpr bool test()
{
using OwningView = std::ranges::owning_view<Base>;
OwningView ov;
decltype(auto) b1 = static_cast<OwningView&>(ov).base();
decltype(auto) b2 = static_cast<OwningView&&>(ov).base();
decltype(auto) b3 = static_cast<const OwningView&>(ov).base();
decltype(auto) b4 = static_cast<const OwningView&&>(ov).base();
ASSERT_SAME_TYPE(decltype(b1), Base&);
ASSERT_SAME_TYPE(decltype(b2), Base&&);
ASSERT_SAME_TYPE(decltype(b3), const Base&);
ASSERT_SAME_TYPE(decltype(b4), const Base&&);
assert(&b1 == &b2);
assert(&b1 == &b3);
assert(&b1 == &b4);
ASSERT_NOEXCEPT(static_cast<OwningView&>(ov).base());
ASSERT_NOEXCEPT(static_cast<OwningView&&>(ov).base());
ASSERT_NOEXCEPT(static_cast<const OwningView&>(ov).base());
ASSERT_NOEXCEPT(static_cast<const OwningView&&>(ov).base());
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
|
