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-no-concepts
11 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
12 
13 // sentinel() = default;
14 // constexpr explicit sentinel(sentinel_t<Base> end);
15 // constexpr sentinel(sentinel<!Const> s)
16 //   requires Const && convertible_to<sentinel_t<V>, sentinel_t<Base>>;
17 
18 #include <ranges>
19 #include <cassert>
20 
21 #include "test_macros.h"
22 #include "test_iterators.h"
23 #include "../types.h"
24 
25 constexpr bool test() {
26   int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
27 
28   {
29     // Test the default ctor.
30     using TakeView = std::ranges::take_view<MoveOnlyView>;
31     using Sentinel = std::ranges::sentinel_t<TakeView>;
32     Sentinel s;
33     TakeView tv = TakeView(MoveOnlyView(buffer), 4);
34     assert(tv.begin() + 4 == s);
35   }
36 
37   {
38     // Test the conversion from "sentinel" to "sentinel-to-const".
39     using TakeView = std::ranges::take_view<MoveOnlyView>;
40     using Sentinel = std::ranges::sentinel_t<TakeView>;
41     using ConstSentinel = std::ranges::sentinel_t<const TakeView>;
42     static_assert(std::is_convertible_v<Sentinel, ConstSentinel>);
43     TakeView tv = TakeView(MoveOnlyView(buffer), 4);
44     Sentinel s = tv.end();
45     ConstSentinel cs = s;
46     cs = s;  // test assignment also
47     assert(tv.begin() + 4 == s);
48     assert(tv.begin() + 4 == cs);
49     assert(std::as_const(tv).begin() + 4 == s);
50     assert(std::as_const(tv).begin() + 4 == cs);
51   }
52 
53   {
54     // Test the constructor from "base-sentinel" to "sentinel".
55     using TakeView = std::ranges::take_view<MoveOnlyView>;
56     using Sentinel = std::ranges::sentinel_t<TakeView>;
57     sentinel_wrapper<int*> sw1 = MoveOnlyView(buffer).end();
58     static_assert( std::is_constructible_v<Sentinel, sentinel_wrapper<int*>>);
59     static_assert(!std::is_convertible_v<sentinel_wrapper<int*>, Sentinel>);
60     auto s = Sentinel(sw1);
61     std::same_as<sentinel_wrapper<int*>> auto sw2 = s.base();
62     assert(base(sw2) == base(sw1));
63   }
64 
65   return true;
66 }
67 
68 int main(int, char**) {
69   test();
70   static_assert(test());
71 
72   return 0;
73 }
74