62 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11// friend constexpr decltype(auto) iter_move(const iterator& i);12 13#include <cassert>14#include <ranges>15 16#include "../types.h"17 18constexpr 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 calls31 // iter_move on the correct inner iterator32 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 56int main(int, char**) {57 test();58 static_assert(test());59 60 return 0;61}62