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// template<class... Types>
14// tuple<VTypes...> make_tuple(Types&&... t);
15
16// UNSUPPORTED: c++03
17
18#include <tuple>
19#include <functional>
20#include <cassert>
21
22#include "test_macros.h"
23
24TEST_CONSTEXPR_CXX20
25bool test()
26{
27 int i = 0;
28 float j = 0;
29 std::tuple<int, int&, float&> t =
30 std::make_tuple(1, std::ref(i), std::ref(j));
31 assert(std::get<0>(t) == 1);
32 assert(std::get<1>(t) == 0);
33 assert(std::get<2>(t) == 0);
34 i = 2;
35 j = 3.5;
36 assert(std::get<0>(t) == 1);
37 assert(std::get<1>(t) == 2);
38 assert(std::get<2>(t) == 3.5);
39 std::get<1>(t) = 0;
40 std::get<2>(t) = 0;
41 assert(i == 0);
42 assert(j == 0);
43
44 return true;
45}
46
47int main(int, char**)
48{
49 test();
50#if TEST_STD_VER >= 20
51 static_assert(test());
52#endif
53
54#if TEST_STD_VER > 11
55 {
56 constexpr auto t1 = std::make_tuple(0, 1, 3.14);
57 constexpr int i1 = std::get<1>(t1);
58 constexpr double d1 = std::get<2>(t1);
59 static_assert (i1 == 1, "" );
60 static_assert (d1 == 3.14, "" );
61 }
62#endif
63
64 return 0;
65}
66

source code of libcxx/test/std/utilities/tuple/tuple.tuple/tuple.creation/make_tuple.pass.cpp