libstdc++-v3/testsuite/23_containers/unordered_multiset/insert/hash_policy.cc

// { dg-options "-std=gnu++0x" }

// Copyright (C) 2011-2014 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/>.

#include <unordered_set>
#include <limits>
#include <ext/throw_allocator.h>
#include <testsuite_hooks.h>

void test01()
{
  bool test __attribute__((unused)) = true;

  typedef std::numeric_limits<size_t> nl_size_t;
  std::unordered_multiset<int, std::hash<int>, std::equal_to<int>,
			  __gnu_cxx::throw_allocator_limit<int> > us;
  const int nb = 100;
  int scheduled_throw_counter = 0;
  std::size_t thrown_exceptions = 0;
  for (int i = 0; i != nb; ++i)
    {
      if ((float)(us.size() + 1)
	  / (float)us.bucket_count() >= us.max_load_factor())
	{
	  // We are going to need a rehash, lets introduce allocation issues:
	  __gnu_cxx::limit_condition::set_limit(scheduled_throw_counter++);
	}
      try
	{
	  us.insert(i / 2);
	  scheduled_throw_counter = 0;
	}
      catch (const __gnu_cxx::forced_error&)
	{
	  ++thrown_exceptions;
	  --i;
	}
      VERIFY( us.load_factor() <= us.max_load_factor() );
      __gnu_cxx::limit_condition::set_limit(nl_size_t::max());
    }

  VERIFY( thrown_exceptions != 0 );
  // Check that all values have been inserted:
  for (int i = 0; i != nb / 2; ++i)
    {
      VERIFY( us.count(i) == 2 );
    }
}

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