libstdc++-v3/testsuite/20_util/variant/relops/three_way.cc

   1 // Copyright (C) 2020-2023 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do compile { target c++20 } }
  19
  20 #include <variant>
  21
  22 void
  23 test01()
  24 {
  25   using V = std::variant<int, int>;
  26   constexpr auto I0 = std::in_place_index<0>;
  27   constexpr auto I1 = std::in_place_index<1>;
  28
  29   static_assert( std::is_eq(V{I0, 0} <=> V{I0, 0})  );
  30   static_assert( std::is_eq(V{I0, 1} <=> V{I0, 1})  );
  31
  32   static_assert( std::is_lt(V{I0, 0} <=> V{I1, 0})  );
  33   static_assert( std::is_lt(V{I0, 1} <=> V{I1, 0})  );
  34
  35   static_assert( std::is_gt(V{I0, 1} <=> V{I0, 0})  );
  36   static_assert( std::is_gt(V{I1, 0} <=> V{I0, 1})  );
  37
  38   static_assert( V{I0, 0} == V{I0, 0}  );
  39   static_assert( V{I0, 0} != V{I1, 0}  );
  40   static_assert( V{I1, 0} != V{I1, 1}  );
  41 }
  42
  43 void
  44 test02()
  45 {
  46   static_assert( std::is_eq(std::monostate{} <=> std::monostate{}) );
  47   static_assert( std::monostate{} == std::monostate{} );
  48   static_assert( std::monostate{} <= std::monostate{} );
  49   static_assert( std::monostate{} >= std::monostate{} );
  50   static_assert( !(std::monostate{} != std::monostate{}) );
  51   static_assert( !(std::monostate{} < std::monostate{}) );
  52   static_assert( !(std::monostate{} > std::monostate{}) );
  53 }