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// { dg-options "-std=gnu++17" }
// { dg-do run { target c++17 } }
// Copyright (C) 2013-2019 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>
int counter = 0;
struct mixin_counter
{
mixin_counter() { ++counter; }
mixin_counter(mixin_counter const&) { ++counter; }
~mixin_counter() { --counter; }
};
struct value_type : private mixin_counter
{
value_type() = default;
value_type(int) : state(1) { }
value_type(std::initializer_list<char>, const char*) : state(2) { }
int state = 0;
};
int main()
{
using O = std::optional<value_type>;
// Check emplace
{
O o;
o.emplace();
VERIFY( o && o->state == 0 );
}
{
O o { std::in_place, 0 };
o.emplace();
VERIFY( o && o->state == 0 );
}
{
O o;
o.emplace(0);
VERIFY( o && o->state == 1 );
}
{
O o { std::in_place };
o.emplace(0);
VERIFY( o && o->state == 1 );
}
{
O o;
o.emplace({ 'a' }, "");
VERIFY( o && o->state == 2 );
}
{
O o { std::in_place };
o.emplace({ 'a' }, "");
VERIFY( o && o->state == 2 );
}
{
O o;
VERIFY(&o.emplace(0) == &*o);
VERIFY(&o.emplace({ 'a' }, "") == &*o);
}
static_assert( !std::is_constructible<O, std::initializer_list<int>, int>(), "" );
VERIFY( counter == 0 );
}
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