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// { dg-options "-std=gnu++17" }
// { dg-do run { target c++17 } }
// Copyright (C) 2013-2018 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 <vector>
#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 { };
int main()
{
using O = std::optional<value_type>;
// Check std::nullopt_t and 'default' (= {}) assignment
{
O o;
o = std::nullopt;
VERIFY( !o );
}
{
O o { std::in_place };
o = std::nullopt;
VERIFY( !o );
}
{
O o;
o = {};
VERIFY( !o );
}
{
O o { std::in_place };
o = {};
VERIFY( !o );
}
{
std::optional<std::vector<int>> ovi{{1, 2, 3}};
VERIFY(ovi->size() == 3);
VERIFY((*ovi)[0] == 1 && (*ovi)[1] == 2 && (*ovi)[2] == 3);
ovi = {4, 5, 6, 7};
VERIFY(ovi->size() == 4);
VERIFY((*ovi)[0] == 4 && (*ovi)[1] == 5 &&
(*ovi)[2] == 6 && (*ovi)[3] == 7);
}
VERIFY( counter == 0 );
}
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