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// { dg-options "-std=gnu++17" }
// { dg-do run }
// 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 <testsuite_hooks.h>
#include <vector>
#include <tuple>
struct combined {
std::vector<int> v;
std::tuple<int, int> t;
template<class... Args>
combined(std::initializer_list<int> il, Args&&... args)
: v(il), t(std::forward<Args>(args)...)
{
}
};
int main()
{
const int i = 42;
auto o = std::make_optional(i);
static_assert( std::is_same<decltype(o), std::optional<int>>(), "" );
VERIFY( o && *o == 42 );
VERIFY( &*o != &i );
auto o2 = std::make_optional<std::tuple<int, int>>(1, 2);
static_assert( std::is_same<decltype(o2),
std::optional<std::tuple<int, int>>>(), "" );
VERIFY( o2 && std::get<0>(*o2) == 1 && std::get<1>(*o2) == 2);
auto o3 = std::make_optional<std::vector<int>>({42, 666});
static_assert( std::is_same<decltype(o3),
std::optional<std::vector<int>>>(), "" );
VERIFY(o3 && (*o3)[0] == 42 && (*o3)[1] == 666);
auto o4 = std::make_optional<combined>({42, 666});
static_assert( std::is_same<decltype(o4),
std::optional<combined>>(), "" );
VERIFY(o4 && (o4->v)[0] == 42 && (o4->v)[1] == 666
&& std::get<0>(o4->t) == 0 && std::get<1>(o4->t) == 0 );
auto o5 = std::make_optional<combined>({1, 2}, 3, 4);
static_assert( std::is_same<decltype(o5),
std::optional<combined>>(), "" );
VERIFY(o4 && (o5->v)[0] == 1 && (o5->v)[1] == 2
&& std::get<0>(o5->t) == 3 && std::get<1>(o5->t) == 4 );
}
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