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 R& base() & noexcept { return r_; }
12// constexpr const R& base() const& noexcept { return r_; }
13// constexpr R&& base() && noexcept { return std::move(r_); }
14// constexpr const R&& base() const&& noexcept { return std::move(r_); }
15
16#include <ranges>
17
18#include <cassert>
19#include <concepts>
20
21#include "test_macros.h"
22
23struct Base {
24 int *begin() const;
25 int *end() const;
26};
27
28constexpr bool test()
29{
30 using OwningView = std::ranges::owning_view<Base>;
31 OwningView ov;
32 decltype(auto) b1 = static_cast<OwningView&>(ov).base();
33 decltype(auto) b2 = static_cast<OwningView&&>(ov).base();
34 decltype(auto) b3 = static_cast<const OwningView&>(ov).base();
35 decltype(auto) b4 = static_cast<const OwningView&&>(ov).base();
36
37 ASSERT_SAME_TYPE(decltype(b1), Base&);
38 ASSERT_SAME_TYPE(decltype(b2), Base&&);
39 ASSERT_SAME_TYPE(decltype(b3), const Base&);
40 ASSERT_SAME_TYPE(decltype(b4), const Base&&);
41
42 assert(&b1 == &b2);
43 assert(&b1 == &b3);
44 assert(&b1 == &b4);
45
46 ASSERT_NOEXCEPT(static_cast<OwningView&>(ov).base());
47 ASSERT_NOEXCEPT(static_cast<OwningView&&>(ov).base());
48 ASSERT_NOEXCEPT(static_cast<const OwningView&>(ov).base());
49 ASSERT_NOEXCEPT(static_cast<const OwningView&&>(ov).base());
50
51 return true;
52}
53
54int main(int, char**) {
55 test();
56 static_assert(test());
57
58 return 0;
59}
60

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