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 // friend constexpr decltype(auto) iter_move(const iterator& i);
12
13 #include <cassert>
14 #include <ranges>
15
16 #include "../types.h"
17
test()18 constexpr bool test() {
19 int buffer[4][4] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}};
20
21 {
22 std::ranges::join_view jv(buffer);
23 assert(std::ranges::iter_move(jv.begin()) == 1);
24 static_assert(std::is_same_v<decltype(std::ranges::iter_move(jv.begin())), int&&>);
25
26 static_assert(noexcept(std::ranges::iter_move(std::declval<decltype(jv.begin())>())));
27 }
28
29 {
30 // iter_move calls inner's iter_move and calls
31 // iter_move on the correct inner iterator
32 IterMoveSwapAwareView inners[2] = {buffer[0], buffer[1]};
33 std::ranges::join_view jv(inners);
34 auto it = jv.begin();
35
36 const auto& iter_move_called_times1 = jv.base().begin()->iter_move_called;
37 const auto& iter_move_called_times2 = std::next(jv.base().begin())->iter_move_called;
38 assert(iter_move_called_times1 == 0);
39 assert(iter_move_called_times2 == 0);
40
41 std::same_as<std::pair<int&&, int&&>> decltype(auto) x = std::ranges::iter_move(it);
42 assert(std::get<0>(x) == 1);
43 assert(iter_move_called_times1 == 1);
44 assert(iter_move_called_times2 == 0);
45
46 auto it2 = std::ranges::next(it, 4);
47
48 std::same_as<std::pair<int&&, int&&>> decltype(auto) y = std::ranges::iter_move(it2);
49 assert(std::get<0>(y) == 5);
50 assert(iter_move_called_times1 == 1);
51 assert(iter_move_called_times2 == 1);
52 }
53 return true;
54 }
55
main(int,char **)56 int main(int, char**) {
57 test();
58 static_assert(test());
59
60 return 0;
61 }
62