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 // constexpr const I& base() const &;
12 // constexpr I base() &&;
13 
14 #include <iterator>
15 
16 #include "test_macros.h"
17 #include "test_iterators.h"
18 
19 struct InputOrOutputArchetype {
20   using difference_type = int;
21 
22   int *ptr;
23 
24   int operator*() { return *ptr; }
25   void operator++(int) { ++ptr; }
26   InputOrOutputArchetype& operator++() { ++ptr; return *this; }
27 };
28 
29 constexpr bool test() {
30   int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
31 
32   {
33     std::counted_iterator iter(cpp20_input_iterator<int*>{buffer}, 8);
34     assert(base(iter.base()) == buffer);
35     assert(base(std::move(iter).base()) == buffer);
36 
37     ASSERT_NOEXCEPT(iter.base());
38     ASSERT_SAME_TYPE(decltype(iter.base()), const cpp20_input_iterator<int*>&);
39     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), cpp20_input_iterator<int*>);
40   }
41 
42   {
43     std::counted_iterator iter(forward_iterator<int*>{buffer}, 8);
44     assert(base(iter.base()) == buffer);
45     assert(base(std::move(iter).base()) == buffer);
46 
47     ASSERT_SAME_TYPE(decltype(iter.base()), const forward_iterator<int*>&);
48     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), forward_iterator<int*>);
49   }
50 
51   {
52     std::counted_iterator iter(contiguous_iterator<int*>{buffer}, 8);
53     assert(base(iter.base()) == buffer);
54     assert(base(std::move(iter).base()) == buffer);
55 
56     ASSERT_SAME_TYPE(decltype(iter.base()), const contiguous_iterator<int*>&);
57     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), contiguous_iterator<int*>);
58   }
59 
60   {
61     std::counted_iterator iter(InputOrOutputArchetype{buffer}, 6);
62     assert(iter.base().ptr == buffer);
63     assert(std::move(iter).base().ptr == buffer);
64 
65     ASSERT_SAME_TYPE(decltype(iter.base()), const InputOrOutputArchetype&);
66     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), InputOrOutputArchetype);
67   }
68 
69   {
70     const std::counted_iterator iter(cpp20_input_iterator<int*>{buffer}, 8);
71     assert(base(iter.base()) == buffer);
72     assert(base(std::move(iter).base()) == buffer);
73 
74     ASSERT_SAME_TYPE(decltype(iter.base()), const cpp20_input_iterator<int*>&);
75     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), const cpp20_input_iterator<int*>&);
76   }
77 
78   {
79     const std::counted_iterator iter(forward_iterator<int*>{buffer}, 7);
80     assert(base(iter.base()) == buffer);
81     assert(base(std::move(iter).base()) == buffer);
82 
83     ASSERT_SAME_TYPE(decltype(iter.base()), const forward_iterator<int*>&);
84     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), const forward_iterator<int*>&);
85   }
86 
87   {
88     const std::counted_iterator iter(contiguous_iterator<int*>{buffer}, 6);
89     assert(base(iter.base()) == buffer);
90     assert(base(std::move(iter).base()) == buffer);
91 
92     ASSERT_SAME_TYPE(decltype(iter.base()), const contiguous_iterator<int*>&);
93     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), const contiguous_iterator<int*>&);
94   }
95 
96   {
97     const std::counted_iterator iter(InputOrOutputArchetype{buffer}, 6);
98     assert(iter.base().ptr == buffer);
99     assert(std::move(iter).base().ptr == buffer);
100 
101     ASSERT_SAME_TYPE(decltype(iter.base()), const InputOrOutputArchetype&);
102     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), const InputOrOutputArchetype&);
103   }
104 
105   return true;
106 }
107 
108 int main(int, char**) {
109   test();
110   static_assert(test());
111 
112   return 0;
113 }
114