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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 native_priority_queue.hpp

 * Contains an adapter to Dinkumware/SGI tree tables

 */

#ifndef PB_DS_NATIVE_PRIORITY_QUEUE_HPP

#define PB_DS_NATIVE_PRIORITY_QUEUE_HPP

#include <string>

#include <vector>

#include <queue>

#include <deque>

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

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

#include <io/xml.hpp>

namespace __gnu_pbds

{

  namespace test

  {

    namespace detail

    {

      template<typename Value_Type, bool Vector, typename _Alloc>

      struct base_seq

      {

      private:

        typedef typename _Alloc::template rebind<Value_Type> value_rebind;

      public:

        typedef std::vector<Value_Type, typename value_rebind::other> type;

      };

      template<typename Value_Type, typename _Alloc>

      struct base_seq<Value_Type, false, _Alloc>

      {

      private:

        typedef typename _Alloc::template rebind<Value_Type> value_rebind;

      public:

        typedef std::deque<Value_Type, typename value_rebind::other> type;

      };

    } // namespace detail

    struct native_pq_tag

    { };

#define PB_DS_CLASS_C_DEC \

    native_priority_queue<Value_Type, Vector, Cmp_Fn, _Alloc>

#define PB_DS_BASE_C_DEC \

    std::priority_queue<Value_Type, typename detail::base_seq<Value_Type, Vector, _Alloc>::type, Cmp_Fn>

    template<typename Value_Type,

             bool Vector,

             typename Cmp_Fn = std::less<Value_Type>,

             typename _Alloc = std::allocator<char> >

    class native_priority_queue : public PB_DS_BASE_C_DEC

    {

    private:

      typedef PB_DS_BASE_C_DEC base_type;

      typedef typename _Alloc::template rebind<Value_Type> value_rebind;

    public:

      typedef Value_Type value_type;

      typedef typename value_rebind::other::const_reference const_reference;

      typedef native_pq_tag container_category;

      typedef Cmp_Fn cmp_fn;

      native_priority_queue() : base_type()

      { }

      template<typename It>

      native_priority_queue(It f, It l) : base_type(f, l)

      { }

      static std::string

      name()

      {

        if (Vector)

          return ("n_pq_vector");

        return ("n_pq_deque");

      }

      static std::string

      desc()

      {

        if (Vector)

          return make_xml_tag("type", "value", "std::priority_queue_vector");

        return make_xml_tag("type", "value", "std::priority_queue_deque");

      }

      void

      clear()

      { *static_cast<base_type*>(this) = base_type(); }

      void

      erase(const_reference r_val)

      {

        base_type tmp;

        Cmp_Fn cmp;

        while (cmp(base_type::top(), r_val) || cmp(r_val, base_type::top()))

          {

            tmp.push(base_type::top());

            base_type::pop();

          }

        if (!base_type::empty())

          {

            base_type::pop();

            while (!base_type::empty())

              {

                tmp.push(base_type::top());

                base_type::pop();

              }

          }

        *static_cast<base_type* >(this) = tmp;

      }

      template<typename Pred>

      size_t

      erase_if(Pred pred)

      {

        base_type tmp;

        std::size_t ersd = 0;

        while (!base_type::empty())

          {

            if (!pred(base_type::top()))

              tmp.push(base_type::top());

            else

              ++ersd;

            base_type::pop();

          }

        *static_cast<base_type*>(this) = tmp;

        return ersd;

      }

      template<typename Pred>

      void

      split(Pred pred, PB_DS_CLASS_C_DEC& other)

      {

        base_type tmp;

        other.clear();

        while (!base_type::empty())

          {

            if (!pred(base_type::top()))

              tmp.push(base_type::top());

            else

              other.push(base_type::top());

            base_type::pop();

          }

        *static_cast<base_type*>(this) = tmp;

      }

      void

      modify(const_reference r_old, const_reference r_new)

      {

        erase(r_old);

        this->push(r_new);

      }

      void

      join(PB_DS_CLASS_C_DEC& other)

      {

        std::vector<value_type> a_tmp;

        while (!base_type::empty())

          {

            a_tmp.push_back(base_type::top());

            base_type::pop();

          }

        while (!other.empty())

          {

            a_tmp.push_back(other.top());

            other.pop();

          }

        *static_cast<base_type*>(this) = base_type(a_tmp.begin(), a_tmp.end());

      }

      Cmp_Fn

      get_cmp_fn() const

      { return Cmp_Fn(); }

    };

#undef PB_DS_BASE_C_DEC

#undef PB_DS_CLASS_C_DEC

  } // namespace test

} // namespace __gnu_pbds

#endif