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

   1 // Copyright (C) 2019-2020 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   struct ThrowingConversion {
  28     operator int() { throw 0; }
  29   };
  30
  31   std::variant<float, char, int> v{'a'};
  32   try
  33   {
  34     ThrowingConversion x;
  35     v.emplace<2>(x);
  36     VERIFY(false);
  37   }
  38   catch (int)
  39   {
  40     VERIFY( !v.valueless_by_exception() );
  41     VERIFY( v.index() == 1 );
  42     VERIFY( std::get<1>(v) == 'a' );
  43   }
  44 }
  45
  46 void
  47 test02()
  48 {
  49   struct ThrowingConstructor {
  50     ThrowingConstructor(std::initializer_list<int>, char) { throw 1; }
  51   };
  52
  53   std::variant<float, char, ThrowingConstructor> v{'a'};
  54   try
  55   {
  56     v.emplace<2>({1, 2, 3}, '4');
  57     VERIFY(false);
  58   }
  59   catch (int)
  60   {
  61     VERIFY( !v.valueless_by_exception() );
  62     VERIFY( v.index() == 1 );
  63     VERIFY( std::get<1>(v) == 'a' );
  64   }
  65 }
  66
  67 int
  68 main()
  69 {
  70   test01();
  71   test02();
  72 }