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 
12 // constexpr const I& base() const &;
13 // constexpr I base() &&;
14 
15 #include <iterator>
16 
17 #include "test_macros.h"
18 #include "test_iterators.h"
19 
20 struct InputOrOutputArchetype {
21   using difference_type = int;
22 
23   int *ptr;
24 
25   int operator*() { return *ptr; }
26   void operator++(int) { ++ptr; }
27   InputOrOutputArchetype& operator++() { ++ptr; return *this; }
28 };
29 
30 constexpr bool test() {
31   int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
32 
33   {
34     std::counted_iterator iter(cpp20_input_iterator<int*>{buffer}, 8);
35     assert(iter.base().base() == buffer);
36     assert(std::move(iter).base().base() == buffer);
37 
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(iter.base() == forward_iterator<int*>{buffer});
45     assert(std::move(iter).base() == forward_iterator<int*>{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(iter.base() == contiguous_iterator<int*>{buffer});
54     assert(std::move(iter).base() == contiguous_iterator<int*>{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(iter.base().base() == buffer);
72     assert(std::move(iter).base().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(iter.base() == forward_iterator<int*>{buffer});
81     assert(std::move(iter).base() == forward_iterator<int*>{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(iter.base() == contiguous_iterator<int*>{buffer});
90     assert(std::move(iter).base() == contiguous_iterator<int*>{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