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// Copyright (C) 2018-2022 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 run { target c++2a } }
#include <numeric>
#include <iterator>
#include <testsuite_hooks.h>
struct Int
{
Int(int v) : val(v) { }
~Int() = default;
Int(const Int& x) : val(x.val), copies(x.copies), moved_from(x.moved_from)
{ ++copies; }
Int(Int&& x) : val(x.val), copies(x.copies), moved_from(x.moved_from)
{ x.moved_from = true; }
Int& operator=(const Int& x)
{
val = x.val;
copies = x.copies + 1;
moved_from = x.moved_from;
return *this;
}
Int& operator=(Int&& x)
{
val = x.val;
copies = x.copies;
moved_from = x.moved_from;
x.moved_from = true;
return *this;
}
int val = 0;
int copies = 0;
bool moved_from = false;
};
Int operator+(Int x, Int y) { x.val += y.val; return x; }
struct Add
{
Int operator()(Int x, Int y) const { x.val += y.val; return x; }
};
void
test01()
{
Int i[] = { 0, 1, 2, 3, 4 };
Int res = std::accumulate(std::begin(i), std::end(i), Int{0});
VERIFY( res.copies == 0 );
VERIFY( !res.moved_from );
for (const auto& r : i)
VERIFY( !r.moved_from );
}
void
test02()
{
Int i[] = { 0, 1, 2, 3, 4 };
Int res = std::accumulate(std::begin(i), std::end(i), Int{0}, Add{});
VERIFY( res.copies == 0 );
VERIFY( !res.moved_from );
for (const auto& r : i)
VERIFY( !r.moved_from );
}
int
main()
{
test01();
test02();
}