// { dg-do run { target c++14 } } // Copyright (C) 2013-2018 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; value_type const reference { 42, "forty-two" }; { O o; VERIFY( o < reference ); VERIFY( !(reference < o) ); VERIFY( !(o > reference) ); VERIFY( reference > o ); VERIFY( o <= reference ); VERIFY( !(reference <= o) ); VERIFY( !(o >= reference) ); VERIFY( reference >= o ); } { O o { value_type { 11, "eleventy" } }; VERIFY( o < reference ); VERIFY( !(reference < o) ); VERIFY( !(o > reference) ); VERIFY( reference > o ); VERIFY( o <= reference ); VERIFY( !(reference <= o) ); VERIFY( !(o >= reference) ); VERIFY( reference >= o ); } { O o { value_type { 42, "forty-two" } }; VERIFY( !(o < reference) ); VERIFY( !(reference < o) ); VERIFY( !(o > reference) ); VERIFY( !(reference > o) ); VERIFY( o <= reference ); VERIFY( reference <= o ); VERIFY( o >= reference ); VERIFY( reference >= o ); } }