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// sentinel() = default;
12// constexpr explicit sentinel(sentinel_t<Base> end);
13// constexpr sentinel(sentinel<!Const> s)
14// requires Const && convertible_to<sentinel_t<V>, sentinel_t<Base>>;
15
16#include <ranges>
17#include <cassert>
18
19#include "test_macros.h"
20#include "test_iterators.h"
21#include "../types.h"
22
23constexpr bool test() {
24 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
25
26 {
27 // Test the default ctor.
28 using TakeView = std::ranges::take_view<MoveOnlyView>;
29 using Sentinel = std::ranges::sentinel_t<TakeView>;
30 Sentinel s;
31 TakeView tv = TakeView(MoveOnlyView(buffer), 4);
32 assert(tv.begin() + 4 == s);
33 }
34
35 {
36 // Test the conversion from "sentinel" to "sentinel-to-const".
37 using TakeView = std::ranges::take_view<MoveOnlyView>;
38 using Sentinel = std::ranges::sentinel_t<TakeView>;
39 using ConstSentinel = std::ranges::sentinel_t<const TakeView>;
40 static_assert(std::is_convertible_v<Sentinel, ConstSentinel>);
41 TakeView tv = TakeView(MoveOnlyView(buffer), 4);
42 Sentinel s = tv.end();
43 ConstSentinel cs = s;
44 cs = s; // test assignment also
45 assert(tv.begin() + 4 == s);
46 assert(tv.begin() + 4 == cs);
47 assert(std::as_const(tv).begin() + 4 == s);
48 assert(std::as_const(tv).begin() + 4 == cs);
49 }
50
51 {
52 // Test the constructor from "base-sentinel" to "sentinel".
53 using TakeView = std::ranges::take_view<MoveOnlyView>;
54 using Sentinel = std::ranges::sentinel_t<TakeView>;
55 sentinel_wrapper<int*> sw1 = MoveOnlyView(buffer).end();
56 static_assert(std::is_constructible_v<Sentinel, sentinel_wrapper<int*>>);
57 static_assert(!std::is_convertible_v<sentinel_wrapper<int*>, Sentinel>);
58 auto s = Sentinel(sw1);
59 std::same_as<sentinel_wrapper<int*>> auto sw2 = s.base();
60 assert(base(sw2) == base(sw1));
61 }
62
63 return true;
64}
65
66int main(int, char**) {
67 test();
68 static_assert(test());
69
70 return 0;
71}
72

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