44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
// Copyright (C) 2019-2024 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-do compile { target c++20 } }
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#include <functional>
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struct F
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{
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constexpr int operator()(int i, int j) { return i + j; }
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constexpr int operator()(int i, int j) const { return i * j; }
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};
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constexpr int
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test01(int i, int j)
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{
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F f;
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return std::ref(std::ref(f))(i, j);
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}
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static_assert( test01(1, 2) == 3 );
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constexpr int
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test02(int i, int j)
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{
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F f;
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return std::cref(std::cref(f))(i, j);
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}
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static_assert( test02(4, 5) == 20 );
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