libstdc++-v3/testsuite/20_util/variant/86874.cc

   1 // Copyright (C) 2018-2021 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-options "-std=gnu++17" }
  19 // { dg-do run { target c++17 } }
  20
  21 #include <variant>
  22 #include <testsuite_hooks.h>
  23
  24 void
  25 test01()
  26 {
  27   std::variant<std::monostate> v1, v2;
  28   std::swap(v1, v2);
  29 }
  30
  31 void
  32 test02()
  33 {
  34   std::variant<int> v1{1}, v2{2};
  35   std::swap(v1, v2);
  36   VERIFY( std::get<0>(v1) == 2 );
  37   VERIFY( std::get<0>(v2) == 1 );
  38 }
  39
  40 void
  41 test03()
  42 {
  43   std::variant<double, int> v1{1}, v2{2.3};
  44   std::swap(v1, v2);
  45   VERIFY( std::get<double>(v1) == 2.3 );
  46   VERIFY( std::get<int>(v2) == 1 );
  47 }
  48
  49 int
  50 main()
  51 {
  52   test01();
  53   test02();
  54   test03();
  55 }