| // Copyright (C) 2019-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-options "-std=gnu++2a" } |
| // { dg-do compile { target c++2a } } |
| |
| #include <utility> |
| #include <tuple> |
| |
| constexpr int |
| test01(int i, int j) |
| { |
| using T = std::tuple<int>; |
| std::pair<int, int> p0, p1; |
| std::pair<int, int> pij(std::piecewise_construct, T(i), T(j)); |
| std::pair<int, int> pji(std::piecewise_construct, T(j), T(i)); |
| p0.swap(pij); |
| swap(p1, pji); |
| return p0.first - p0.second - p1.first + p1.second; |
| } |
| |
| static_assert( test01(5, 100) == -190 ); |
