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