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// { dg-do compile { target c++17 } }
// 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/>.
// C++17 29.8.3 [reduce]
#include <numeric>
#include <iterator>
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
struct T
{
T(int);
T(T&&); // MoveConstructible
T& operator=(T&&); // not required by the standard, but it needs to be
T operator+(const T&) const;
};
void
test01()
{
T t[1]{1};
std::reduce(t, t+1, T(0));
using __gnu_test::test_container;
using __gnu_test::input_iterator_wrapper;
test_container<T, input_iterator_wrapper> con(t);
std::reduce(con.begin(), con.end(), T(0));
}
struct Op
{
T operator()(T&, T&) const&;
// The standard does *not* require invoking as an rvalue to be supported.
T operator()(T&, T&) && = delete;
// The standard does *not* require rvalue arguments to be supported
// (this is almost certainly a defect and should be allowed).
T operator()(T&&, T&&) const = delete;
};
void
test02()
{
T t[1]{1};
std::reduce(t, t+1, T(0), Op());
using __gnu_test::test_container;
using __gnu_test::input_iterator_wrapper;
test_container<T, input_iterator_wrapper> con(t);
std::reduce(con.begin(), con.end(), T(0), Op());
}
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