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 U1, class U2> tuple(const pair<U1, U2>& u);
14
15// UNSUPPORTED: c++03
16
17#include <tuple>
18#include <utility>
19#include <cassert>
20
21#include "test_macros.h"
22
23int main(int, char**)
24{
25 {
26 typedef std::pair<long, char> T0;
27 typedef std::tuple<long long, short> T1;
28 T0 t0(2, 'a');
29 T1 t1 = t0;
30 assert(std::get<0>(t1) == 2);
31 assert(std::get<1>(t1) == short('a'));
32 }
33#if TEST_STD_VER > 11
34 {
35 typedef std::pair<long, char> P0;
36 typedef std::tuple<long long, short> T1;
37 constexpr P0 p0(2, 'a');
38 constexpr T1 t1 = p0;
39 static_assert(std::get<0>(t1) == std::get<0>(p0), "");
40 static_assert(std::get<1>(t1) == std::get<1>(p0), "");
41 static_assert(std::get<0>(t1) == 2, "");
42 static_assert(std::get<1>(t1) == short('a'), "");
43 }
44#endif
45
46 return 0;
47}
48

source code of libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_pair.pass.cpp