libstdc++-v3/testsuite/19_diagnostics/system_error/what-4.cc

// { dg-do run { target c++11 } }

// Copyright (C) 2007-2021 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/>.

// 19.1 Exception classes

#include <string>
#include <system_error>
#include <testsuite_hooks.h>

// Make sure each invocation of what() doesn't grow the message.
void test01()
{
  std::string s("after nine thirty, this request cannot be met");

  std::system_error obj =
    std::system_error(std::make_error_code(std::errc::invalid_argument), s);
  std::string s1(obj.what());
  std::string s2(obj.what());
  VERIFY( s1 == s2 );
}

int main(void)
{
  test01();
  return 0;
}