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 // constexpr sentinel<false> end();
14 // constexpr iterator<false> end() requires common_range<V>;
15 // constexpr sentinel<true> end() const
16 //   requires range<const V> &&
17 //            regular_invocable<const F&, range_reference_t<const V>>;
18 // constexpr iterator<true> end() const
19 //   requires common_range<const V> &&
20 //            regular_invocable<const F&, range_reference_t<const V>>;
21 
22 #include <ranges>
23 
24 #include "test_macros.h"
25 #include "types.h"
26 
27 template<class T>
28 concept HasConstQualifiedEnd = requires(const T& t) { t.end(); };
29 
30 constexpr bool test() {
31   {
32     using TransformView = std::ranges::transform_view<ForwardView, PlusOneMutable>;
33     static_assert(std::ranges::common_range<TransformView>);
34     TransformView tv;
35     auto end = tv.end();
36     ASSERT_SAME_TYPE(decltype(end.base()), std::ranges::sentinel_t<ForwardView>);
37     assert(base(end.base()) == globalBuff + 8);
38     static_assert(!HasConstQualifiedEnd<TransformView>);
39   }
40   {
41     using TransformView = std::ranges::transform_view<InputView, PlusOneMutable>;
42     static_assert(!std::ranges::common_range<TransformView>);
43     TransformView tv;
44     auto end = tv.end();
45     ASSERT_SAME_TYPE(decltype(end.base()), std::ranges::sentinel_t<InputView>);
46     assert(base(base(end.base())) == globalBuff + 8);
47     static_assert(!HasConstQualifiedEnd<TransformView>);
48   }
49   {
50     using TransformView = std::ranges::transform_view<InputView, PlusOne>;
51     static_assert(!std::ranges::common_range<TransformView>);
52     TransformView tv;
53     auto end = tv.end();
54     ASSERT_SAME_TYPE(decltype(end.base()), std::ranges::sentinel_t<InputView>);
55     assert(base(base(end.base())) == globalBuff + 8);
56     auto cend = std::as_const(tv).end();
57     ASSERT_SAME_TYPE(decltype(cend.base()), std::ranges::sentinel_t<const InputView>);
58     assert(base(base(cend.base())) == globalBuff + 8);
59   }
60   {
61     using TransformView = std::ranges::transform_view<MoveOnlyView, PlusOneMutable>;
62     static_assert(std::ranges::common_range<TransformView>);
63     TransformView tv;
64     auto end = tv.end();
65     ASSERT_SAME_TYPE(decltype(end.base()), std::ranges::sentinel_t<MoveOnlyView>);
66     assert(end.base() == globalBuff + 8);
67     static_assert(!HasConstQualifiedEnd<TransformView>);
68   }
69   {
70     using TransformView = std::ranges::transform_view<MoveOnlyView, PlusOne>;
71     static_assert(std::ranges::common_range<TransformView>);
72     TransformView tv;
73     auto end = tv.end();
74     ASSERT_SAME_TYPE(decltype(end.base()), std::ranges::sentinel_t<MoveOnlyView>);
75     assert(end.base() == globalBuff + 8);
76     auto cend = std::as_const(tv).end();
77     ASSERT_SAME_TYPE(decltype(cend.base()), std::ranges::sentinel_t<const MoveOnlyView>);
78     assert(cend.base() == globalBuff + 8);
79   }
80   return true;
81 }
82 
83 int main(int, char**) {
84   test();
85   static_assert(test());
86 
87   return 0;
88 }
89