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 T* begin() noexcept;
12// constexpr const T* begin() const noexcept;
13
14#include <ranges>
15#include <cassert>
16
17#include "test_macros.h"
18
19struct Empty {};
20struct BigType { char buffer[64] = {10}; };
21
22constexpr bool test() {
23 {
24 auto sv = std::ranges::single_view<int>(42);
25 assert(*sv.begin() == 42);
26
27 ASSERT_SAME_TYPE(decltype(sv.begin()), int*);
28 static_assert(noexcept(sv.begin()));
29 }
30 {
31 const auto sv = std::ranges::single_view<int>(42);
32 assert(*sv.begin() == 42);
33
34 ASSERT_SAME_TYPE(decltype(sv.begin()), const int*);
35 static_assert(noexcept(sv.begin()));
36 }
37
38 {
39 auto sv = std::ranges::single_view<Empty>(Empty());
40 assert(sv.begin() != nullptr);
41
42 ASSERT_SAME_TYPE(decltype(sv.begin()), Empty*);
43 }
44 {
45 const auto sv = std::ranges::single_view<Empty>(Empty());
46 assert(sv.begin() != nullptr);
47
48 ASSERT_SAME_TYPE(decltype(sv.begin()), const Empty*);
49 }
50
51 {
52 auto sv = std::ranges::single_view<BigType>(BigType());
53 assert(sv.begin()->buffer[0] == 10);
54
55 ASSERT_SAME_TYPE(decltype(sv.begin()), BigType*);
56 }
57 {
58 const auto sv = std::ranges::single_view<BigType>(BigType());
59 assert(sv.begin()->buffer[0] == 10);
60
61 ASSERT_SAME_TYPE(decltype(sv.begin()), const BigType*);
62 }
63
64 return true;
65}
66
67int main(int, char**) {
68 test();
69 static_assert(test());
70
71 return 0;
72}
73

source code of libcxx/test/std/ranges/range.factories/range.single.view/begin.pass.cpp