libstdc++-v3/testsuite/20_util/variant/87431.cc

   1 // Copyright (C) 2019-2024 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 run { target c++17 } }
  19
  20 #include <variant>
  21 #include <testsuite_hooks.h>
  22
  23 void
  24 test01()
  25 {
  26   struct ThrowingConversion {
  27     operator int() { throw 0; }
  28   };
  29
  30   std::variant<float, char, int> v{'a'};
  31   try
  32   {
  33     ThrowingConversion x;
  34     v.emplace<2>(x);
  35     VERIFY(false);
  36   }
  37   catch (int)
  38   {
  39     VERIFY( !v.valueless_by_exception() );
  40     VERIFY( v.index() == 1 );
  41     VERIFY( std::get<1>(v) == 'a' );
  42   }
  43 }
  44
  45 void
  46 test02()
  47 {
  48   struct ThrowingConstructor {
  49     ThrowingConstructor(std::initializer_list<int>, char) { throw 1; }
  50   };
  51
  52   std::variant<float, char, ThrowingConstructor> v{'a'};
  53   try
  54   {
  55     v.emplace<2>({1, 2, 3}, '4');
  56     VERIFY(false);
  57   }
  58   catch (int)
  59   {
  60     VERIFY( !v.valueless_by_exception() );
  61     VERIFY( v.index() == 1 );
  62     VERIFY( std::get<1>(v) == 'a' );
  63   }
  64 }
  65
  66 int
  67 main()
  68 {
  69   test01();
  70   test02();
  71 }