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96 lines
2.0 KiB
C++
96 lines
2.0 KiB
C++
// { dg-options "-std=gnu++1y" }
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// { dg-do run }
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// Copyright (C) 2013-2014 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a moved_to of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include <experimental/optional>
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#include <testsuite_hooks.h>
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struct exception {};
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int counter = 0;
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struct mixin_counter
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{
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mixin_counter() { ++counter; }
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mixin_counter(mixin_counter const&) { ++counter; }
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~mixin_counter() { --counter; }
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};
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namespace ns
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{
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struct value_type : private mixin_counter
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{
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explicit value_type(int state) : state(state) { }
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int state;
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};
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int swaps = 0;
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void
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swap(value_type& lhs, value_type& rhs)
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{
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++swaps;
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using std::swap;
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swap(lhs.state, rhs.state);
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}
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} // namespace ns
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int main()
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{
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using O = std::experimental::optional<ns::value_type>;
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VERIFY( ns::swaps == 0 );
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{
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O o, p;
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swap(o, p);
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VERIFY( !o );
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VERIFY( !p );
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}
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{
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O o { std::experimental::in_place, 45 }, p;
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swap(o, p);
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VERIFY( !o );
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VERIFY( p && p->state == 45 );
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}
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{
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O o, p { std::experimental::in_place, 45 };
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swap(o, p);
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VERIFY( o && o->state == 45 );
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VERIFY( !p );
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}
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{
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O o { std::experimental::in_place, 167 }, p { std::experimental::in_place, 999 };
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VERIFY( ns::swaps == 0 );
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swap(o, p);
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VERIFY( o && o->state == 999 );
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VERIFY( p && p->state == 167 );
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VERIFY( ns::swaps == 1 );
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}
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VERIFY( counter == 0 );
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}
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