37 lines
1.2 KiB
C++
37 lines
1.2 KiB
C++
// Copyright (C) 2019-2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// { dg-options "-std=gnu++2a" }
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// { dg-do compile { target c++2a } }
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#include <utility>
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#include <tuple>
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constexpr int
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test01(int i, int j)
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{
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using T = std::tuple<int>;
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std::pair<int, int> p0, p1;
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std::pair<int, int> pij(std::piecewise_construct, T(i), T(j));
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std::pair<int, int> pji(std::piecewise_construct, T(j), T(i));
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p0.swap(pij);
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swap(p1, pji);
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return p0.first - p0.second - p1.first + p1.second;
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}
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static_assert( test01(5, 100) == -190 );
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