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// <tuple>
10
11// template <class... Types> class tuple;
12
13// void swap(tuple& rhs);
14
15// UNSUPPORTED: c++03
16
17#include <tuple>
18#include <cassert>
19
20#include "test_macros.h"
21#include "MoveOnly.h"
22
23TEST_CONSTEXPR_CXX20
24bool test()
25{
26 {
27 typedef std::tuple<> T;
28 T t0;
29 T t1;
30 t0.swap(t1);
31 }
32 {
33 typedef std::tuple<MoveOnly> T;
34 T t0(MoveOnly(0));
35 T t1(MoveOnly(1));
36 t0.swap(t1);
37 assert(std::get<0>(t0) == 1);
38 assert(std::get<0>(t1) == 0);
39 }
40 {
41 typedef std::tuple<MoveOnly, MoveOnly> T;
42 T t0(MoveOnly(0), MoveOnly(1));
43 T t1(MoveOnly(2), MoveOnly(3));
44 t0.swap(t1);
45 assert(std::get<0>(t0) == 2);
46 assert(std::get<1>(t0) == 3);
47 assert(std::get<0>(t1) == 0);
48 assert(std::get<1>(t1) == 1);
49 }
50 {
51 typedef std::tuple<MoveOnly, MoveOnly, MoveOnly> T;
52 T t0(MoveOnly(0), MoveOnly(1), MoveOnly(2));
53 T t1(MoveOnly(3), MoveOnly(4), MoveOnly(5));
54 t0.swap(t1);
55 assert(std::get<0>(t0) == 3);
56 assert(std::get<1>(t0) == 4);
57 assert(std::get<2>(t0) == 5);
58 assert(std::get<0>(t1) == 0);
59 assert(std::get<1>(t1) == 1);
60 assert(std::get<2>(t1) == 2);
61 }
62 return true;
63}
64
65int main(int, char**)
66{
67 test();
68#if TEST_STD_VER > 17
69 static_assert(test());
70#endif
71
72 return 0;
73}
74

source code of libcxx/test/std/utilities/tuple/tuple.tuple/tuple.swap/member_swap.pass.cpp