libstdc++-v3/testsuite/20_util/optional/relops/5.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do run { target c++17 }  }
   3
   4 // Copyright (C) 2013-2020 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 <optional>
  22 #include <testsuite_hooks.h>
  23
  24 #include <tuple>
  25 #include <string>
  26
  27 namespace ns
  28 {
  29   struct value_type
  30   {
  31     int i;
  32     std::string s;
  33   };
  34
  35   bool
  36   operator==(value_type const& lhs, value_type const& rhs)
  37   { return std::tie(lhs.i, lhs.s) == std::tie(rhs.i, rhs.s); }
  38
  39   bool
  40   operator<(value_type const& lhs, value_type const& rhs)
  41   { return std::tie(lhs.i, lhs.s) < std::tie(rhs.i, rhs.s); }
  42
  43 } // namespace ns
  44
  45 int main()
  46 {
  47   using ns::value_type;
  48   using O = std::optional<value_type>;
  49   using std::nullopt;
  50
  51   {
  52     O o;
  53     VERIFY( o == nullopt );
  54     VERIFY( nullopt == o );
  55     VERIFY( !(o != nullopt) );
  56     VERIFY( !(nullopt != o) );
  57   }
  58
  59   {
  60     O o { std::in_place };
  61     VERIFY( !(o == nullopt) );
  62     VERIFY( !(nullopt == o) );
  63     VERIFY( o != nullopt );
  64     VERIFY( nullopt != o );
  65   }
  66 }