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