96 lines
1.9 KiB
C++
96 lines
1.9 KiB
C++
// { dg-options "-std=gnu++17" }
|
|
// { dg-do run { target c++17 } }
|
|
|
|
// Copyright (C) 2013-2020 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/>.
|
|
|
|
#include <optional>
|
|
#include <testsuite_hooks.h>
|
|
|
|
struct exception {};
|
|
|
|
int counter = 0;
|
|
|
|
struct mixin_counter
|
|
{
|
|
mixin_counter() { ++counter; }
|
|
mixin_counter(mixin_counter const&) { ++counter; }
|
|
~mixin_counter() { --counter; }
|
|
};
|
|
|
|
namespace ns
|
|
{
|
|
|
|
struct value_type : private mixin_counter
|
|
{
|
|
explicit value_type(int state) : state(state) { }
|
|
int state;
|
|
};
|
|
|
|
int swaps = 0;
|
|
|
|
void
|
|
swap(value_type& lhs, value_type& rhs)
|
|
{
|
|
++swaps;
|
|
using std::swap;
|
|
swap(lhs.state, rhs.state);
|
|
}
|
|
|
|
} // namespace ns
|
|
|
|
int main()
|
|
{
|
|
using O = std::optional<ns::value_type>;
|
|
|
|
VERIFY( ns::swaps == 0 );
|
|
|
|
{
|
|
O o, p;
|
|
swap(o, p);
|
|
VERIFY( !o );
|
|
VERIFY( !p );
|
|
}
|
|
|
|
{
|
|
O o { std::in_place, 45 }, p;
|
|
swap(o, p);
|
|
VERIFY( !o );
|
|
VERIFY( p && p->state == 45 );
|
|
}
|
|
|
|
{
|
|
O o, p { std::in_place, 45 };
|
|
swap(o, p);
|
|
VERIFY( o && o->state == 45 );
|
|
VERIFY( !p );
|
|
}
|
|
|
|
{
|
|
O o { std::in_place, 167 }, p { std::in_place, 999 };
|
|
VERIFY( ns::swaps == 0 );
|
|
|
|
swap(o, p);
|
|
|
|
VERIFY( o && o->state == 999 );
|
|
VERIFY( p && p->state == 167 );
|
|
VERIFY( ns::swaps == 1 );
|
|
}
|
|
|
|
VERIFY( counter == 0 );
|
|
}
|