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 auto operator->() const noexcept
12 // requires contiguous_iterator<I>;
13
14 #include <iterator>
15
16 #include "test_macros.h"
17 #include "test_iterators.h"
18
19 template<class Iter>
20 concept ArrowEnabled = requires(Iter& iter) {
21 iter.operator->();
22 };
23
test()24 constexpr bool test() {
25 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
26
27 {
28 std::counted_iterator iter(contiguous_iterator<int*>{buffer}, 8);
29 for (int i = 0; i < 8; ++i, ++iter)
30 assert(iter.operator->() == buffer + i);
31
32 static_assert(noexcept(iter.operator->()));
33 }
34 {
35 const std::counted_iterator iter(contiguous_iterator<int*>{buffer}, 8);
36 assert(iter.operator->() == buffer);
37
38 static_assert(noexcept(iter.operator->()));
39 }
40
41 {
42 static_assert( ArrowEnabled<std::counted_iterator<contiguous_iterator<int*>>>);
43 static_assert(!ArrowEnabled<std::counted_iterator<random_access_iterator<int*>>>);
44 }
45
46 return true;
47 }
48
main(int,char **)49 int main(int, char**) {
50 test();
51 static_assert(test());
52
53 return 0;
54 }
55