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// Copyright (C) 2016-2022 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-do run { target c++14 } }
#include <vector>
#include <memory>
#include <testsuite_hooks.h>
// See https://gcc.gnu.org/ml/libstdc++/2016-07/msg00008.html for background.
struct T
{
T(int v = 0) : value(v) { }
T(const T& t);
T& operator=(const T& t);
void make_child() { child = std::make_unique<T>(value + 10); }
std::unique_ptr<T> child;
int value;
};
T::T(const T& t) : value(t.value)
{
if (t.child)
child.reset(new T(*t.child));
}
T& T::operator=(const T& t)
{
value = t.value;
if (t.child)
{
if (child)
*child = *t.child;
else
child.reset(new T(*t.child));
}
else
child.reset();
return *this;
}
void
test01()
{
std::vector<T> v;
v.reserve(3);
v.push_back(T(1));
v.back().make_child();
v.push_back(T(2));
v.back().make_child();
VERIFY(v[1].child->value == 12);
VERIFY(v[1].child->child == nullptr);
v.insert(v.begin(), *v[1].child);
VERIFY(v[0].value == 12);
VERIFY(v[0].child == nullptr);
}
int main()
{
test01();
}
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