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 | // template<input_iterator I> |
12 | // requires same_as<ITER_TRAITS(I), iterator_traits<I>> // see [iterator.concepts.general] |
13 | // struct iterator_traits<counted_iterator<I>> : iterator_traits<I> { |
14 | // using pointer = conditional_t<contiguous_iterator<I>, |
15 | // add_pointer_t<iter_reference_t<I>>, void>; |
16 | // }; |
17 | |
18 | #include <iterator> |
19 | |
20 | #include "test_macros.h" |
21 | #include "test_iterators.h" |
22 | |
23 | void test() { |
24 | { |
25 | using Iter = cpp17_input_iterator<int*>; |
26 | using CommonIter = std::counted_iterator<Iter>; |
27 | using IterTraits = std::iterator_traits<CommonIter>; |
28 | |
29 | static_assert(std::same_as<IterTraits::iterator_category, std::input_iterator_tag>); |
30 | static_assert(std::same_as<IterTraits::value_type, int>); |
31 | static_assert(std::same_as<IterTraits::difference_type, std::ptrdiff_t>); |
32 | static_assert(std::same_as<IterTraits::pointer, void>); |
33 | static_assert(std::same_as<IterTraits::reference, int&>); |
34 | } |
35 | { |
36 | using Iter = forward_iterator<int*>; |
37 | using CommonIter = std::counted_iterator<Iter>; |
38 | using IterTraits = std::iterator_traits<CommonIter>; |
39 | |
40 | static_assert(std::same_as<IterTraits::iterator_category, std::forward_iterator_tag>); |
41 | static_assert(std::same_as<IterTraits::value_type, int>); |
42 | static_assert(std::same_as<IterTraits::difference_type, std::ptrdiff_t>); |
43 | static_assert(std::same_as<IterTraits::pointer, void>); |
44 | static_assert(std::same_as<IterTraits::reference, int&>); |
45 | } |
46 | { |
47 | using Iter = random_access_iterator<int*>; |
48 | using CommonIter = std::counted_iterator<Iter>; |
49 | using IterTraits = std::iterator_traits<CommonIter>; |
50 | |
51 | static_assert(std::same_as<IterTraits::iterator_category, std::random_access_iterator_tag>); |
52 | static_assert(std::same_as<IterTraits::value_type, int>); |
53 | static_assert(std::same_as<IterTraits::difference_type, std::ptrdiff_t>); |
54 | static_assert(std::same_as<IterTraits::pointer, void>); |
55 | static_assert(std::same_as<IterTraits::reference, int&>); |
56 | } |
57 | { |
58 | using Iter = contiguous_iterator<int*>; |
59 | using CommonIter = std::counted_iterator<Iter>; |
60 | using IterTraits = std::iterator_traits<CommonIter>; |
61 | |
62 | static_assert(std::same_as<IterTraits::iterator_category, std::contiguous_iterator_tag>); |
63 | static_assert(std::same_as<IterTraits::value_type, int>); |
64 | static_assert(std::same_as<IterTraits::difference_type, std::ptrdiff_t>); |
65 | static_assert(std::same_as<IterTraits::pointer, int*>); |
66 | static_assert(std::same_as<IterTraits::reference, int&>); |
67 | } |
68 | } |
69 | |