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-has-no-incomplete-ranges
11
12 // constexpr auto size() requires sized_range<V>;
13 // constexpr auto size() const requires sized_range<const V>;
14
15 #include <ranges>
16
17 #include <cassert>
18 #include <utility>
19
20 #include "test_macros.h"
21 #include "types.h"
22
23 // end - begin = 8, but size may return something else.
24 template<CopyCategory CC>
25 struct BidirSizedRange : std::ranges::view_base {
26 int *ptr_;
27 size_t size_;
28
BidirSizedRangeBidirSizedRange29 constexpr BidirSizedRange(int *ptr, size_t size) : ptr_(ptr), size_(size) {}
30 constexpr BidirSizedRange(const BidirSizedRange &) requires (CC == Copyable) = default;
31 constexpr BidirSizedRange(BidirSizedRange &&) requires (CC == MoveOnly) = default;
32 constexpr BidirSizedRange& operator=(const BidirSizedRange &) requires (CC == Copyable) = default;
33 constexpr BidirSizedRange& operator=(BidirSizedRange &&) requires (CC == MoveOnly) = default;
34
beginBidirSizedRange35 constexpr bidirectional_iterator<int*> begin() { return bidirectional_iterator<int*>{ptr_}; }
beginBidirSizedRange36 constexpr bidirectional_iterator<const int*> begin() const { return bidirectional_iterator<const int*>{ptr_}; }
endBidirSizedRange37 constexpr bidirectional_iterator<int*> end() { return bidirectional_iterator<int*>{ptr_ + 8}; }
endBidirSizedRange38 constexpr bidirectional_iterator<const int*> end() const { return bidirectional_iterator<const int*>{ptr_ + 8}; }
39
sizeBidirSizedRange40 constexpr size_t size() const { return size_; }
41 };
42
test()43 constexpr bool test() {
44 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
45
46 // Non-common, non-const bidirectional range.
47 {
48 auto rev = std::ranges::reverse_view(BidirSizedRange<Copyable>{buffer, 4});
49 assert(std::ranges::size(rev) == 4);
50 assert(rev.size() == 4);
51 assert(std::move(rev).size() == 4);
52
53 ASSERT_SAME_TYPE(decltype(rev.size()), size_t);
54 ASSERT_SAME_TYPE(decltype(std::move(rev).size()), size_t);
55 }
56 // Non-common, const bidirectional range.
57 {
58 const auto rev = std::ranges::reverse_view(BidirSizedRange<Copyable>{buffer, 4});
59 assert(std::ranges::size(rev) == 4);
60 assert(rev.size() == 4);
61 assert(std::move(rev).size() == 4);
62
63 ASSERT_SAME_TYPE(decltype(rev.size()), size_t);
64 ASSERT_SAME_TYPE(decltype(std::move(rev).size()), size_t);
65 }
66 // Non-common, non-const (move only) bidirectional range.
67 {
68 auto rev = std::ranges::reverse_view(BidirSizedRange<MoveOnly>{buffer, 4});
69 assert(std::move(rev).size() == 4);
70
71 ASSERT_SAME_TYPE(decltype(std::move(rev).size()), size_t);
72 }
73
74 return true;
75 }
76
main(int,char **)77 int main(int, char**) {
78 test();
79 static_assert(test());
80
81 return 0;
82 }
83