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

// Copyright (C) 2019-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// { dg-do run { target c++17 } }

#include <variant>
#include <testsuite_hooks.h>

void
test01()
{
  struct ThrowingConversion {
    operator int() { throw 0; }
  };

  std::variant<float, char, int> v{'a'};
  try
  {
    ThrowingConversion x;
    v.emplace<2>(x);
    VERIFY(false);
  }
  catch (int)
  {
    VERIFY( !v.valueless_by_exception() );
    VERIFY( v.index() == 1 );
    VERIFY( std::get<1>(v) == 'a' );
  }
}

void
test02()
{
  struct ThrowingConstructor {
    ThrowingConstructor(std::initializer_list<int>, char) { throw 1; }
  };

  std::variant<float, char, ThrowingConstructor> v{'a'};
  try
  {
    v.emplace<2>({1, 2, 3}, '4');
    VERIFY(false);
  }
  catch (int)
  {
    VERIFY( !v.valueless_by_exception() );
    VERIFY( v.index() == 1 );
    VERIFY( std::get<1>(v) == 'a' );
  }
}

int
main()
{
  test01();
  test02();
}