// { dg-options "-std=gnu++14" } // { dg-do run } // Copyright (C) 2013-2016 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 // . #include #include #include #include namespace ns { struct value_type { int i; std::string s; }; bool operator==(value_type const& lhs, value_type const& rhs) { return std::tie(lhs.i, lhs.s) == std::tie(rhs.i, rhs.s); } bool operator<(value_type const& lhs, value_type const& rhs) { return std::tie(lhs.i, lhs.s) < std::tie(rhs.i, rhs.s); } } // namespace ns int main() { using ns::value_type; using O = std::experimental::optional; using std::experimental::nullopt; { O o; VERIFY( o == nullopt ); VERIFY( nullopt == o ); VERIFY( !(o != nullopt) ); VERIFY( !(nullopt != o) ); } { O o { std::experimental::in_place }; VERIFY( !(o == nullopt) ); VERIFY( !(nullopt == o) ); VERIFY( o != nullopt ); VERIFY( nullopt != o ); } }