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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009, 2010 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.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  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.hpp

 * Contains priority_queues.

 */

#ifndef PB_DS_PRIORITY_QUEUE_HPP

#define PB_DS_PRIORITY_QUEUE_HPP

#include <bits/c++config.h>

#include <ext/pb_ds/tag_and_trait.hpp>

#include <ext/pb_ds/detail/priority_queue_base_dispatch.hpp>

#include <ext/pb_ds/detail/standard_policies.hpp>

namespace __gnu_pbds

{

  /**

   *  @defgroup heap-based Heap-Based

   *  @ingroup containers-pbds

   *  @{

   */

  /**

   *  @defgroup heap-detail Base and Policy Classes

   *  @ingroup heap-based

   */

  /**

   *  A priority queue composed of one specific heap policy.

   *

   *  @tparam _Tv               Value type.

   *  @tparam Cmp_Fn            Comparison functor.

   *  @tparam Tag               Instantiating data structure type,

   *                            see container_tag.

   *  @tparam _Alloc            Allocator type.

   *

   *  Base is dispatched at compile time via Tag, from the following

   *  choices: binary_heap_tag, binomial_heap_tag, pairing_heap_tag,

   *           rc_binomial_heap_tag, thin_heap_tag

   *

   *  Base choices are: detail::binary_heap, detail::binomial_heap,

   *                    detail::pairing_heap, detail::rc_binomial_heap,

   *                    detail::thin_heap.

   */

   template<typename _Tv,

           typename Cmp_Fn = std::less<_Tv>,

           typename Tag = pairing_heap_tag,

           typename _Alloc = std::allocator<char> >

  class priority_queue

  : public detail::container_base_dispatch<_Tv, Cmp_Fn, _Alloc, Tag>::type

  {

  public:

    typedef _Tv                                         value_type;

    typedef Cmp_Fn                                      cmp_fn;

    typedef Tag                                         container_category;

    typedef _Alloc                                      allocator_type;

    typedef typename allocator_type::size_type          size_type;

    typedef typename allocator_type::difference_type    difference_type;

  private:

    typedef typename detail::container_base_dispatch<_Tv, Cmp_Fn, _Alloc,

                                                     Tag>::type

                                                        base_type;

    typedef typename _Alloc::template rebind<_Tv>       __rebind_v;

    typedef typename __rebind_v::other                  __rebind_va;

 public:

    typedef typename __rebind_va::reference             reference;

    typedef typename __rebind_va::const_reference       const_reference;

    typedef typename __rebind_va::pointer               pointer;

    typedef typename __rebind_va::const_pointer         const_pointer;

    typedef typename base_type::point_iterator          point_iterator;

    typedef typename base_type::point_const_iterator    point_const_iterator;

    typedef typename base_type::iterator                iterator;

    typedef typename base_type::const_iterator          const_iterator;

    priority_queue() { }

    /// Constructor taking some policy objects. r_cmp_fn will be

    /// copied by the Cmp_Fn object of the container object.

    priority_queue(const cmp_fn& r_cmp_fn) : base_type(r_cmp_fn) { }

    /// Constructor taking __iterators to a range of value_types. The

    /// value_types between first_it and last_it will be inserted into

    /// the container object.

    template<typename It>

    priority_queue(It first_it, It last_it)

    { base_type::copy_from_range(first_it, last_it); }

    /// Constructor taking __iterators to a range of value_types and

    /// some policy objects The value_types between first_it and

    /// last_it will be inserted into the container object. r_cmp_fn

    /// will be copied by the cmp_fn object of the container object.

    template<typename It>

    priority_queue(It first_it, It last_it, const cmp_fn& r_cmp_fn)

    : base_type(r_cmp_fn)

    { base_type::copy_from_range(first_it, last_it); }

    priority_queue(const priority_queue& other)

    : base_type((const base_type& )other) { }

    virtual

    ~priority_queue() { }

    priority_queue&

    operator=(const priority_queue& other)

    {

      if (this != &other)

        {

          priority_queue tmp(other);

          swap(tmp);

        }

      return *this;

    }

    void

    swap(priority_queue& other)

    { base_type::swap(other); }

  };

} // namespace __gnu_pbds

 //@} heap-based

#endif