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47df7e19 | 1 | // { dg-do compile { target c++17 } } |
435e56fb | 2 | |
7adcbafe | 3 | // Copyright (C) 2013-2022 Free Software Foundation, Inc. |
435e56fb VV |
4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
8 | // Free Software Foundation; either version 3, or (at your option) | |
9 | // any later version. | |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
16 | // You should have received a copy of the GNU General Public License along | |
17 | // with this library; see the file COPYING3. If not see | |
18 | // <http://www.gnu.org/licenses/>. | |
19 | ||
20 | #include <optional> | |
21 | #include <testsuite_hooks.h> | |
22 | ||
23 | int main() | |
24 | { | |
25 | // [20.5.6] Disengaged state indicator | |
26 | static_assert( std::is_same<decltype(std::nullopt), const std::nullopt_t>(), "" ); | |
27 | static_assert( std::is_empty<std::nullopt_t>(), "" ); | |
24b54628 | 28 | static_assert( __is_literal_type(std::nullopt_t), "" ); |
435e56fb VV |
29 | static_assert( !std::is_default_constructible<std::nullopt_t>(), "" ); |
30 | ||
31 | { | |
32 | constexpr std::optional<int> o = std::nullopt; | |
33 | static_assert( !o, "" ); | |
34 | } | |
35 | ||
36 | { | |
37 | constexpr std::optional<int> o = { std::nullopt }; | |
38 | static_assert( !o, "" ); | |
39 | } | |
40 | ||
41 | { | |
42 | constexpr std::optional<int> o { std::nullopt }; | |
43 | static_assert( !o, "" ); | |
44 | } | |
45 | } |