1// { dg-options "-std=gnu++14" }
2// { dg-do run }
3
4// Copyright (C) 2013-2015 Free Software Foundation, Inc.
5//
6// This file is part of the GNU ISO C++ Library.  This library is free
7// software; you can redistribute it and/or modify it under the
8// terms of the GNU General Public License as published by the
9// Free Software Foundation; either version 3, or (at your option)
10// any later version.
11
12// This library is distributed in the hope that it will be useful,
13// but WITHOUT ANY WARRANTY; without even the implied warranty of
14// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15// GNU General Public License for more details.
16
17// You should have received a copy of the GNU General Public License along
18// with this library; see the file COPYING3.  If not see
19// <http://www.gnu.org/licenses/>.
20
21#include <experimental/optional>
22#include <testsuite_hooks.h>
23
24int main()
25{
26  // [20.5.6] Disengaged state indicator
27  static_assert( std::is_same<decltype(std::experimental::nullopt), const std::experimental::nullopt_t>(), "" );
28  static_assert( std::is_empty<std::experimental::nullopt_t>(), "" );
29  static_assert( std::is_literal_type<std::experimental::nullopt_t>(), "" );
30  static_assert( !std::is_default_constructible<std::experimental::nullopt_t>(), "" );
31
32  {
33    std::experimental::optional<int> o = std::experimental::nullopt;
34    VERIFY( !o );
35  }
36
37  {
38    std::experimental::optional<int> o = { std::experimental::nullopt };
39    VERIFY( !o );
40  }
41
42  {
43    std::experimental::optional<int> o { std::experimental::nullopt };
44    VERIFY( !o );
45  }
46}
47