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[thirdparty/gcc.git] / libstdc++-v3 / testsuite / experimental / optional / nullopt.cc
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1// { dg-options "-std=gnu++1y" }
2// { dg-do run }
3
aa118a03 4// Copyright (C) 2013-2014 Free Software Foundation, Inc.
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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}