libstdc++-v3/testsuite/23_containers/unordered_multimap/insert/52476.cc

// { dg-options "-std=gnu++0x" }
//
// Copyright (C) 2012-2014 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_map>
#include <vector>
#include <algorithm>
#include <testsuite_hooks.h>

void test01()
{
  using namespace std;
  bool test __attribute__((unused)) = true;
  
  unordered_multimap<int, int> mmap;
  vector<int> values;

  size_t nb_bkts = mmap.bucket_count();
  int i = 0;
  for (;; ++i)
    {
      mmap.insert(make_pair(0, i));
      if (mmap.bucket_count() != nb_bkts)
	// Container got rehash
	break;
      values.clear();
      transform(mmap.begin(), mmap.end(), back_inserter(values),
		[](const pair<int, int>& p) { return p.second; });
    }

  vector<int> rehash_values;
  transform(mmap.begin(), mmap.end(), back_inserter(rehash_values),
	    [](const pair<int, int>& p) { return p.second; });
  // Remove the value that result in a rehash
  rehash_values.erase(remove(rehash_values.begin(), rehash_values.end(), i));

  VERIFY( rehash_values == values );
}
  
int main()
{
  test01();
  return 0;
}