libstdc++-v3/testsuite/experimental/optional/relops/3.cc

   1 // { dg-do run { target c++14 } }
   2
   3 // Copyright (C) 2013-2022 Free Software Foundation, Inc.
   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 <experimental/optional>
  21 #include <testsuite_hooks.h>
  22
  23 #include <tuple>
  24 #include <string>
  25
  26 namespace ns
  27 {
  28   struct value_type
  29   {
  30     int i;
  31     std::string s;
  32   };
  33
  34   bool
  35   operator==(value_type const& lhs, value_type const& rhs)
  36   { return std::tie(lhs.i, lhs.s) == std::tie(rhs.i, rhs.s); }
  37
  38   bool
  39   operator<(value_type const& lhs, value_type const& rhs)
  40   { return std::tie(lhs.i, lhs.s) < std::tie(rhs.i, rhs.s); }
  41
  42 } // namespace ns
  43
  44 int main()
  45 {
  46   using ns::value_type;
  47   using O = std::experimental::optional<value_type>;
  48
  49   value_type const reference { 42, "forty-two" };
  50
  51   {
  52     O o;
  53     VERIFY( !(o == reference) );
  54     VERIFY( !(reference == o) );
  55     VERIFY( o != reference );
  56     VERIFY( reference != o );
  57   }
  58
  59   {
  60     O o { value_type { 11, "eleventy" } };
  61     VERIFY( !(o == reference) );
  62     VERIFY( !(reference == o) );
  63     VERIFY( o != reference );
  64     VERIFY( reference != o );
  65   }
  66
  67   {
  68     O o { value_type { 42, "forty-two" } };
  69     VERIFY( o == reference );
  70     VERIFY( reference == o );
  71     VERIFY( !(o != reference) );
  72     VERIFY( !(reference != o) );
  73   }
  74 }