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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009, 2011 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 rb_tree_map_/node.hpp

 * Contains an implementation for rb_tree_.

 */

#ifndef PB_DS_RB_TREE_NODE_HPP

#define PB_DS_RB_TREE_NODE_HPP

#include <ext/pb_ds/detail/branch_policy/null_node_metadata.hpp>

namespace __gnu_pbds

{

  namespace detail

  {

    /// Node for Red-Black trees.

    template<typename Value_Type, class Metadata, typename _Alloc>

    struct rb_tree_node_

    {

    public:

      typedef Value_Type                value_type;

      typedef Metadata                  metadata_type;

      typedef

      typename _Alloc::template rebind<

      rb_tree_node_<

      Value_Type,

      Metadata,

      _Alloc> >::other::pointer

      node_pointer;

      typedef

      typename _Alloc::template rebind<

        metadata_type>::other::reference

      metadata_reference;

      typedef

      typename _Alloc::template rebind<

        metadata_type>::other::const_reference

      metadata_const_reference;

      bool

      special() const

      { return m_red; }

      metadata_const_reference

      get_metadata() const

      { return m_metadata; }

      metadata_reference

      get_metadata()

      { return m_metadata; }

#ifdef PB_DS_BIN_SEARCH_TREE_TRACE_

      void

      trace() const

      {

        std::cout << PB_DS_V2F(m_value) <<(m_red? " <r> " : " <b> ")

                  << "(" << m_metadata << ")";

      }

#endif

      node_pointer      m_p_left;

      node_pointer      m_p_right;

      node_pointer      m_p_parent;

      value_type        m_value;

      bool              m_red;

      metadata_type     m_metadata;

    };

    template<typename Value_Type, typename _Alloc>

    struct rb_tree_node_<Value_Type, null_type, _Alloc>

    {

    public:

      typedef Value_Type                value_type;

      typedef null_type         metadata_type;

      typedef

      typename _Alloc::template rebind<

      rb_tree_node_<

      Value_Type,

      null_type,

      _Alloc> >::other::pointer

      node_pointer;

      bool

      special() const

      { return m_red; }

#ifdef PB_DS_BIN_SEARCH_TREE_TRACE_

      void

      trace() const

      { std::cout << PB_DS_V2F(m_value) <<(m_red? " <r> " : " <b> "); }

#endif 

      node_pointer      m_p_left;

      node_pointer      m_p_right;

      node_pointer      m_p_parent;

      value_type        m_value;

      bool              m_red;

    };

  } // namespace detail

} // namespace __gnu_pbds

#endif