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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009 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/>.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software

// is hereby granted without fee, provided that the above copyright

// notice appears in all copies, and that both that copyright notice

// and this permission notice appear in supporting documentation. None

// of the above authors, nor IBM Haifa Research Laboratories, make any

// representation about the suitability of this software for any

// purpose. It is provided "as is" without express or implied

// warranty.

/**

 * @file priority_queue_erase_if.cpp

 * Example showing how to conditionally erase values from a priority queue.

 */

/**

 * This example shows how to erase from a priority queue using erase_if.

 */

#include <functional>

#include <iostream>

#include <cassert>

#include <ext/pb_ds/priority_queue.hpp>

using namespace std;

using namespace __gnu_pbds;

int

main()

{

  __gnu_pbds::priority_queue<int> p;

  // First we insert some values into the container.

  for (int i = 0; i < 1000; ++i)

    p.push(i);

  assert(p.top() == 999);

  // Now we erase all values that satisfy some predicate, in this case

  // one that returns true for all those larger than 500.

  p.erase_if(bind1st(less<int>(), 500));

  // The largest value should be now 500.

  assert(p.top() == 500);

}