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// Copyright (C) 2019-2023 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-do compile { target c++20 } }
// { dg-add-options no_pch }
#include <functional>
#ifndef __cpp_lib_constexpr_functional
# error "Feature test macro for constexpr invoke is missing in <functional>"
#elif __cpp_lib_constexpr_functional < 201907L
# error "Feature test macro for constexpr invoke has wrong value in <functional>"
#endif
constexpr int inc(int i) { return i + 1; }
constexpr auto inc_f = &inc;
static_assert( std::invoke(inc_f, 2) == 3);
struct Dec
{
constexpr int operator()(int i) const { return i - 1; }
};
static_assert( std::invoke(Dec{}, 5) == 4 );
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