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, c++20
10
11// constexpr sentinel(sentinel<!Const> s);
12
13#include <cassert>
14#include <ranges>
15
16#include "../types.h"
17
18template <class T>
19struct convertible_sentinel_wrapper {
20 explicit convertible_sentinel_wrapper() = default;
21 constexpr convertible_sentinel_wrapper(const T& it) : it_(it) {}
22
23 template <class U>
24 requires std::convertible_to<const U&, T>
25 constexpr convertible_sentinel_wrapper(const convertible_sentinel_wrapper<U>& other) : it_(other.it_) {}
26
27 constexpr friend bool operator==(convertible_sentinel_wrapper const& self, const T& other) {
28 return self.it_ == other;
29 }
30 T it_;
31};
32
33struct NonSimpleNonCommonConvertibleView : IntBufferView {
34 using IntBufferView::IntBufferView;
35
36 constexpr int* begin() { return buffer_; }
37 constexpr const int* begin() const { return buffer_; }
38 constexpr convertible_sentinel_wrapper<int*> end() { return convertible_sentinel_wrapper<int*>(buffer_ + size_); }
39 constexpr convertible_sentinel_wrapper<const int*> end() const {
40 return convertible_sentinel_wrapper<const int*>(buffer_ + size_);
41 }
42};
43
44static_assert(!std::ranges::common_range<NonSimpleNonCommonConvertibleView>);
45static_assert(std::ranges::random_access_range<NonSimpleNonCommonConvertibleView>);
46static_assert(!std::ranges::sized_range<NonSimpleNonCommonConvertibleView>);
47static_assert(std::convertible_to<std::ranges::sentinel_t<NonSimpleNonCommonConvertibleView>,
48 std::ranges::sentinel_t<NonSimpleNonCommonConvertibleView const>>);
49static_assert(!simple_view<NonSimpleNonCommonConvertibleView>);
50
51constexpr bool test() {
52 int buffer1[4] = {1, 2, 3, 4};
53 int buffer2[5] = {1, 2, 3, 4, 5};
54 std::ranges::zip_view v{NonSimpleNonCommonConvertibleView(buffer1), NonSimpleNonCommonConvertibleView(buffer2)};
55 static_assert(!std::ranges::common_range<decltype(v)>);
56 auto sent1 = v.end();
57 std::ranges::sentinel_t<const decltype(v)> sent2 = sent1;
58 static_assert(!std::is_same_v<decltype(sent1), decltype(sent2)>);
59
60 assert(v.begin() != sent2);
61 assert(std::as_const(v).begin() != sent2);
62 assert(v.begin() + 4 == sent2);
63 assert(std::as_const(v).begin() + 4 == sent2);
64
65 // Cannot create a non-const iterator from a const iterator.
66 static_assert(!std::constructible_from<decltype(sent1), decltype(sent2)>);
67 return true;
68}
69
70int main(int, char**) {
71 test();
72 static_assert(test());
73
74 return 0;
75}
76

source code of libcxx/test/std/ranges/range.adaptors/range.zip/sentinel/ctor.other.pass.cpp