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: gcc-10
12 
13 // constexpr const I& base() const &;
14 // constexpr I base() &&;
15 
16 #include <iterator>
17 
18 #include "test_macros.h"
19 #include "test_iterators.h"
20 
21 struct InputOrOutputArchetype {
22   using difference_type = int;
23 
24   int *ptr;
25 
26   int operator*() { return *ptr; }
27   void operator++(int) { ++ptr; }
28   InputOrOutputArchetype& operator++() { ++ptr; return *this; }
29 };
30 
31 constexpr bool test() {
32   int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
33 
34   {
35     std::counted_iterator iter(cpp20_input_iterator<int*>{buffer}, 8);
36     assert(iter.base().base() == buffer);
37     assert(std::move(iter).base().base() == buffer);
38 
39     ASSERT_SAME_TYPE(decltype(iter.base()), const cpp20_input_iterator<int*>&);
40     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), cpp20_input_iterator<int*>);
41   }
42 
43   {
44     std::counted_iterator iter(forward_iterator<int*>{buffer}, 8);
45     assert(iter.base() == forward_iterator<int*>{buffer});
46     assert(std::move(iter).base() == forward_iterator<int*>{buffer});
47 
48     ASSERT_SAME_TYPE(decltype(iter.base()), const forward_iterator<int*>&);
49     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), forward_iterator<int*>);
50   }
51 
52   {
53     std::counted_iterator iter(contiguous_iterator<int*>{buffer}, 8);
54     assert(iter.base() == contiguous_iterator<int*>{buffer});
55     assert(std::move(iter).base() == contiguous_iterator<int*>{buffer});
56 
57     ASSERT_SAME_TYPE(decltype(iter.base()), const contiguous_iterator<int*>&);
58     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), contiguous_iterator<int*>);
59   }
60 
61   {
62     std::counted_iterator iter(InputOrOutputArchetype{buffer}, 6);
63     assert(iter.base().ptr == buffer);
64     assert(std::move(iter).base().ptr == buffer);
65 
66     ASSERT_SAME_TYPE(decltype(iter.base()), const InputOrOutputArchetype&);
67     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), InputOrOutputArchetype);
68   }
69 
70   {
71     const std::counted_iterator iter(cpp20_input_iterator<int*>{buffer}, 8);
72     assert(iter.base().base() == buffer);
73     assert(std::move(iter).base().base() == buffer);
74 
75     ASSERT_SAME_TYPE(decltype(iter.base()), const cpp20_input_iterator<int*>&);
76     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), const cpp20_input_iterator<int*>&);
77   }
78 
79   {
80     const std::counted_iterator iter(forward_iterator<int*>{buffer}, 7);
81     assert(iter.base() == forward_iterator<int*>{buffer});
82     assert(std::move(iter).base() == forward_iterator<int*>{buffer});
83 
84     ASSERT_SAME_TYPE(decltype(iter.base()), const forward_iterator<int*>&);
85     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), const forward_iterator<int*>&);
86   }
87 
88   {
89     const std::counted_iterator iter(contiguous_iterator<int*>{buffer}, 6);
90     assert(iter.base() == contiguous_iterator<int*>{buffer});
91     assert(std::move(iter).base() == contiguous_iterator<int*>{buffer});
92 
93     ASSERT_SAME_TYPE(decltype(iter.base()), const contiguous_iterator<int*>&);
94     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), const contiguous_iterator<int*>&);
95   }
96 
97   {
98     const std::counted_iterator iter(InputOrOutputArchetype{buffer}, 6);
99     assert(iter.base().ptr == buffer);
100     assert(std::move(iter).base().ptr == buffer);
101 
102     ASSERT_SAME_TYPE(decltype(iter.base()), const InputOrOutputArchetype&);
103     ASSERT_SAME_TYPE(decltype(std::move(iter).base()), const InputOrOutputArchetype&);
104   }
105 
106   return true;
107 }
108 
109 int main(int, char**) {
110   test();
111   static_assert(test());
112 
113   return 0;
114 }
115