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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.

// 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 node.hpp

 * Contains an implementation struct for splay_tree_'s node.

 */

#ifndef PB_DS_SPLAY_TREE_NODE_HPP

#define PB_DS_SPLAY_TREE_NODE_HPP

namespace __gnu_pbds

{

  namespace detail

  {

    template<typename Value_Type, class Metadata, class Allocator>

    struct splay_tree_node_

    {

    public:

      typedef Value_Type value_type;

      typedef Metadata metadata_type;

      typedef

      typename Allocator::template rebind<

      splay_tree_node_<Value_Type, Metadata, Allocator> >::other::pointer

      node_pointer;

      typedef

      typename Allocator::template rebind<metadata_type>::other::reference

      metadata_reference;

      typedef

      typename Allocator::template rebind<metadata_type>::other::const_reference

      const_metadata_reference;

#ifdef PB_DS_BIN_SEARCH_TREE_TRACE_

      void

      trace() const

      { std::cout << PB_DS_V2F(m_value) << "(" << m_metadata << ")"; }

#endif

      inline bool

      special() const

      { return m_special; }

      inline const_metadata_reference

      get_metadata() const

      { return m_metadata; }

      inline metadata_reference

      get_metadata()

      { return m_metadata; }

      value_type m_value;

      bool m_special;

      node_pointer m_p_left;

      node_pointer m_p_right;

      node_pointer m_p_parent;

      metadata_type m_metadata;

    };

    template<typename Value_Type, typename Allocator>

    struct splay_tree_node_<Value_Type, null_node_metadata, Allocator>

    {

    public:

      typedef Value_Type value_type;

      typedef null_node_metadata metadata_type;

      typedef

      typename Allocator::template rebind<

      splay_tree_node_<Value_Type, null_node_metadata, Allocator> >::other::pointer

      node_pointer;

      inline bool

      special() const

      { return m_special; }

#ifdef PB_DS_BIN_SEARCH_TREE_TRACE_

      void

      trace() const

      { std::cout << PB_DS_V2F(m_value); }

#endif 

      node_pointer m_p_left;

      node_pointer m_p_right;

      node_pointer m_p_parent;

      value_type m_value;

      bool m_special;

    };

  } // namespace detail

} // namespace __gnu_pbds

#endif